In OKD version 4.6, you can install a cluster on VMware vSphere infrastructure that you provision by deploying it to VMware Cloud (VMC) on AWS.
Once you configure your VMC environment for OKD deployment, you use the OKD installation program from the bastion management host, co-located in the VMC environment. The installation program and control plane automates the process of deploying and managing the resources needed for the OKD cluster.
OKD supports deploying a cluster to a single VMware vCenter only. Deploying a cluster with machines/machine sets on multiple vCenters is not supported. |
You can install OKD on VMware Cloud (VMC) on AWS hosted vSphere clusters to enable applications to be deployed and managed both on-premise and off-premise, across the hybrid cloud.
You must configure several options in your VMC environment prior to installing OKD on VMware vSphere. ensure your VMC environment has the following prerequisites:
Create a non-exclusive, DHCP-enabled, NSX-T network segment and subnet. Other virtual machines (VMs) can be hosted on the subnet, but at least eight IP addresses must be available for the OKD deployment.
Configure the following firewall rules:
An ANY:ANY firewall rule between the OKD compute network and the Internet. This is used by nodes and applications to download container images.
An ANY:ANY firewall rule between the installation host and the software-defined data center (SDDC) management network on port 443. This allows you to upload the Fedora CoreOS (FCOS) OVA during deployment.
An HTTPS firewall rule between the OKD compute network and vCenter. This connection allows OKD to communicate with vCenter for provisioning and managing nodes, persistent volume claims (PVCs), and other resources.
You must have the following information to deploy OKD:
The OKD cluster name, such as vmc-prod-1
.
The base DNS name, such as companyname.com
.
If not using the default, the pod network CIDR and services network CIDR must be identified, which are set by default to 10.128.0.0/14
and 172.30.0.0/16
, respectively. These CIDRs are used for pod-to-pod and pod-to-service communication and are not accessible externally; however, they must not overlap with existing subnets in your organization.
The following vCenter information:
vCenter hostname, username, and password
Datacenter name, such as SDDC-Datacenter
Cluster name, such as Cluster-1
Network name
Datastore name, such as WorkloadDatastore
It is recommended to move your vSphere cluster to the VMC |
A Linux-based host deployed to VMC as a bastion.
The bastion host can be Fedora or any another Linux-based host; it must have Internet connectivity and the ability to upload an OVA to the eSXi hosts.
Download and install the OpenShift CLI tools to the bastion host.
The openshift-install
installation program
The OpenShift CLI (oc
) tool
You cannot use the VMware NSX Container Plugin for Kubernetes (NCP), and NSX is not used as the OpenShift SDN. The version of NSX currently available with VMC is incompatible with the version of NCP certified with OKD. However, the NSX DHCP service is used for virtual machine IP management with the full-stack automated OKD deployment and with nodes provisioned, either manually or automatically, by the Machine API integration with vSphere. Additionally, NSX firewall rules are created to enable access with the OKD cluster and between the bastion host and the VMC vSphere hosts. |
VMware Cloud on AWS is built on top of AWS bare metal infrastructure; this is the same bare metal infrastructure which runs AWS native services. When a VMware cloud on AWS software-defined data center (SDDC) is deployed, you consume these physical server nodes and run the VMware eSXi hypervisor in a single tenant fashion. This means the physical infrastructure is not accessible to anyone else using VMC. It is important to consider how many physical hosts you will need to host your virtual infrastructure.
To determine this, VMware provides the VMC on AWS Sizer. With this tool, you can define the resources you intend to host on VMC:
Types of workloads
Total number of virtual machines
Specification information such as:
Storage requirements
vCPUs
vRAM
Overcommit ratios
With these details, the sizer tool can generate a report, based on VMware best practices, and recommend your cluster configuration and the number of hosts you will need.
Provision block registry storage. For more information on persistent storage, see Understanding persistent storage.
Review details about the OKD installation and update processes.
If you use a firewall, you must configure it to allow the sites that your cluster requires access to.
Be sure to also review this site list if you are configuring a proxy. |
You must install the OKD cluster on a VMware vSphere version 6 or 7 instance that meets the requirements for the components that you use.
Component | Minimum supported versions | Description |
---|---|---|
Hypervisor |
vSphere 6.5 and later with HW version 13 |
This version is the minimum version that Fedora CoreOS (FCOS) supports. See the Red Hat enterprise Linux 8 supported hypervisors list. |
Storage with in-tree drivers |
vSphere 6.5 and later |
This plug-in creates vSphere storage by using the in-tree storage drivers for vSphere included in OKD. |
If you use a vSphere version 6.5 instance, consider upgrading to 6.7U3 or 7.0 before you install OKD.
You must ensure that the time on your eSXi hosts is synchronized before you install OKD. See edit Time Configuration for a Host in the VMware documentation. |
For a cluster that contains user-provisioned infrastructure, you must deploy all of the required machines.
The smallest OKD clusters require the following hosts:
One temporary bootstrap machine
Three control plane, or master, machines
At least two compute machines, which are also known as worker machines.
The cluster requires the bootstrap machine to deploy the OKD cluster on the three control plane machines. You can remove the bootstrap machine after you install the cluster. |
To maintain high availability of your cluster, use separate physical hosts for these cluster machines. |
The bootstrap and control plane machines must use Fedora CoreOS (FCOS) as the operating system. However, the compute machines can choose between Fedora CoreOS (FCOS) or Fedora 7.9.
All the Fedora CoreOS (FCOS) machines require network in initramfs
during boot to fetch Ignition config files from the Machine Config Server.
During the initial boot, the machines require either a DHCP server or that static IP addresses be set in order to establish a network connection to download their Ignition config files.
Additionally, each OKD node in the cluster must have access to a Network Time Protocol (NTP) server.
If a DHCP server provides NTP servers information, the chrony time service on the Fedora CoreOS (FCOS) machines read the information and can sync the clock with the NTP servers.
each cluster machine must meet the following minimum requirements:
Machine | Operating System | vCPU [1] | Virtual RAM | Storage | IOPS [2] |
---|---|---|---|---|---|
Bootstrap |
FCOS |
4 |
16 GB |
100 GB |
300 |
Control plane |
FCOS |
4 |
16 GB |
100 GB |
300 |
Compute |
FCOS |
2 |
8 GB |
100 GB |
300 |
One vCPU is equivalent to one physical core when simultaneous multithreading (SMT), or hyperthreading, is not enabled. When enabled, use the following formula to calculate the corresponding ratio: (threads per core × cores) × sockets = vCPUs.
OKD and Kubernetes are sensitive to disk performance, and faster storage is recommended, particularly for etcd on the control plane nodes which require a 10 ms p99 fsync duration. Note that on many cloud platforms, storage size and IOPS scale together, so you might need to over-allocate storage volume to obtain sufficient performance.
Because your cluster has limited access to automatic machine management when you use infrastructure that you provision, you must provide a mechanism for approving cluster certificate signing requests (CSRs) after installation. The kube-controller-manager
only approves the kubelet client CSRs. The machine-approver
cannot guarantee the validity of a serving certificate that is requested by using kubelet credentials because it cannot confirm that the correct machine issued the request. You must determine and implement a method of verifying the validity of the kubelet serving certificate requests and approving them.
Before you deploy an OKD cluster that uses user-provisioned infrastructure, you must create the underlying infrastructure.
Review the OKD 4.x Tested Integrations page before you create the supporting infrastructure for your cluster.
Configure DHCP or set static IP addresses on each node.
Provision the required load balancers.
Configure the ports for your machines.
Configure DNS.
ensure network connectivity.
All the Fedora CoreOS (FCOS) machines require network in initramfs
during boot
to fetch Ignition config from the machine config server.
During the initial boot, the machines require either a DHCP server or that static IP addresses be set on each host in the cluster in order to establish a network connection, which allows them to download their Ignition config files.
It is recommended to use the DHCP server to manage the machines for the cluster long-term. ensure that the DHCP server is configured to provide persistent IP addresses and host names to the cluster machines.
The Kubernetes API server must be able to resolve the node names of the cluster machines. If the API servers and worker nodes are in different zones, you can configure a default DNS search zone to allow the API server to resolve the node names. Another supported approach is to always refer to hosts by their fully-qualified domain names in both the node objects and all DNS requests.
You must configure the network connectivity between machines to allow cluster components to communicate. each machine must be able to resolve the host names of all other machines in the cluster.
Protocol | Port | Description |
---|---|---|
ICMP |
N/A |
Network reachability tests |
TCP |
|
Metrics |
|
Host level services, including the node exporter on ports |
|
|
The default ports that Kubernetes reserves |
|
|
openshift-sdn |
|
UDP |
|
VXLAN and Geneve |
|
VXLAN and Geneve |
|
|
Host level services, including the node exporter on ports |
|
TCP/UDP |
|
Kubernetes node port |
Protocol | Port | Description |
---|---|---|
TCP |
|
Kubernetes API |
Protocol | Port | Description |
---|---|---|
TCP |
|
etcd server and peer ports |
The infrastructure that you provision for your cluster must meet the following network topology requirements.
OKD requires all nodes to have internet access to pull images for platform containers and provide telemetry data to Red Hat. |
Before you install OKD, you must provision two load balancers that meet the following requirements:
API load balancer: Provides a common endpoint for users, both human and machine, to interact with and configure the platform. Configure the following conditions:
Layer 4 load balancing only. This can be referred to as Raw TCP, SSL Passthrough, or SSL Bridge mode. If you use SSL Bridge mode, you must enable Server Name Indication (SNI) for the API routes.
A stateless load balancing algorithm. The options vary based on the load balancer implementation.
Do not configure session persistence for an API load balancer. |
Configure the following ports on both the front and back of the load balancers:
Port | Back-end machines (pool members) | Internal | external | Description |
---|---|---|---|---|
|
Bootstrap and control plane. You remove the bootstrap machine from the load
balancer after the bootstrap machine initializes the cluster control plane. You
must configure the |
X |
X |
Kubernetes API server |
|
Bootstrap and control plane. You remove the bootstrap machine from the load balancer after the bootstrap machine initializes the cluster control plane. |
X |
Machine config server |
The load balancer must be configured to take a maximum of 30 seconds from the
time the API server turns off the |
Application Ingress load balancer: Provides an Ingress point for application traffic flowing in from outside the cluster. Configure the following conditions:
Layer 4 load balancing only. This can be referred to as Raw TCP, SSL Passthrough, or SSL Bridge mode. If you use SSL Bridge mode, you must enable Server Name Indication (SNI) for the Ingress routes.
A connection-based or session-based persistence is recommended, based on the options available and types of applications that will be hosted on the platform.
Configure the following ports on both the front and back of the load balancers:
Port | Back-end machines (pool members) | Internal | external | Description |
---|---|---|---|---|
|
The machines that run the Ingress router pods, compute, or worker, by default. |
X |
X |
HTTPS traffic |
|
The machines that run the Ingress router pods, compute, or worker, by default. |
X |
X |
HTTP traffic |
If the true IP address of the client can be seen by the load balancer, enabling source IP-based session persistence can improve performance for applications that use end-to-end TLS encryption. |
A working configuration for the Ingress router is required for an OKD cluster. You must configure the Ingress router after the control plane initializes. |
OKD clusters are configured to use a public Network Time Protocol (NTP) server by default. If you want to use a local enterprise NTP server, or if your cluster is being deployed in a disconnected network, you can configure the cluster to use a specific time server. For more information, see the documentation for Configuring chrony time service.
If a DHCP server provides NTP server information, the chrony time service on the Fedora CoreOS (FCOS) machines read the information and can sync the clock with the NTP servers.
DNS is used for name resolution and reverse name resolution. DNS A/AAAA or CNAMe records are used for name resolution and PTR records are used for reverse name resolution. The reverse records are important because Fedora CoreOS (FCOS) uses the reverse records to set the host name for all the nodes. Additionally, the reverse records are used to generate the certificate signing requests (CSR) that OKD needs to operate.
The following DNS records are required for an OKD cluster that uses
user-provisioned infrastructure. In each record, <cluster_name>
is the cluster
name and <base_domain>
is the cluster base domain that you specify in the
install-config.yaml
file. A complete DNS record takes the form: <component>.<cluster_name>.<base_domain>.
.
Component | Record | Description | |
---|---|---|---|
Kubernetes API |
|
Add a DNS A/AAAA or CNAMe record, and a DNS PTR record, to identify the load balancer for the control plane machines. These records must be resolvable by both clients external to the cluster and from all the nodes within the cluster. |
|
|
Add a DNS A/AAAA or CNAMe record, and a DNS PTR record, to identify the load balancer for the control plane machines. These records must be resolvable from all the nodes within the cluster.
|
||
Routes |
|
Add a wildcard DNS A/AAAA or CNAMe record that refers to the load balancer that targets the machines that run the Ingress router pods, which are the worker nodes by default. These records must be resolvable by both clients external to the cluster and from all the nodes within the cluster. |
|
Bootstrap |
|
Add a DNS A/AAAA or CNAMe record, and a DNS PTR record, to identify the bootstrap machine. These records must be resolvable by the nodes within the cluster. |
|
Master hosts |
|
DNS A/AAAA or CNAMe records and DNS PTR records to identify each machine for the control plane nodes (also known as the master nodes). These records must be resolvable by the nodes within the cluster. |
|
Worker hosts |
|
Add DNS A/AAAA or CNAMe records and DNS PTR records to identify each machine for the worker nodes. These records must be resolvable by the nodes within the cluster. |
You can use the |
The following example of a BIND zone file shows sample A records for name resolution. The purpose of the example is to show the records that are needed. The example is not meant to provide advice for choosing one name resolution service over another.
$TTL 1W
@ IN SOA ns1.example.com. root (
2019070700 ; serial
3H ; refresh (3 hours)
30M ; retry (30 minutes)
2W ; expiry (2 weeks)
1W ) ; minimum (1 week)
IN NS ns1.example.com.
IN MX 10 smtp.example.com.
;
;
ns1 IN A 192.168.1.5
smtp IN A 192.168.1.5
;
helper IN A 192.168.1.5
helper.ocp4 IN A 192.168.1.5
;
; The api identifies the IP of your load balancer.
api.ocp4 IN A 192.168.1.5
api-int.ocp4 IN A 192.168.1.5
;
; The wildcard also identifies the load balancer.
*.apps.ocp4 IN A 192.168.1.5
;
; Create an entry for the bootstrap host.
bootstrap.ocp4 IN A 192.168.1.96
;
; Create entries for the master hosts.
master0.ocp4 IN A 192.168.1.97
master1.ocp4 IN A 192.168.1.98
master2.ocp4 IN A 192.168.1.99
;
; Create entries for the worker hosts.
worker0.ocp4 IN A 192.168.1.11
worker1.ocp4 IN A 192.168.1.7
;
;eOF
The following example BIND zone file shows sample PTR records for reverse name resolution.
$TTL 1W
@ IN SOA ns1.example.com. root (
2019070700 ; serial
3H ; refresh (3 hours)
30M ; retry (30 minutes)
2W ; expiry (2 weeks)
1W ) ; minimum (1 week)
IN NS ns1.example.com.
;
; The syntax is "last octet" and the host must have an FQDN
; with a trailing dot.
97 IN PTR master0.ocp4.example.com.
98 IN PTR master1.ocp4.example.com.
99 IN PTR master2.ocp4.example.com.
;
96 IN PTR bootstrap.ocp4.example.com.
;
5 IN PTR api.ocp4.example.com.
5 IN PTR api-int.ocp4.example.com.
;
11 IN PTR worker0.ocp4.example.com.
7 IN PTR worker1.ocp4.example.com.
;
;eOF
If you want to perform installation debugging or disaster recovery on your cluster, you must provide an SSH key to both your ssh-agent
and the installation program. You can use this key to access the bootstrap machine in a public cluster to troubleshoot installation issues.
In a production environment, you require disaster recovery and debugging. |
You can use this key to SSH into the master nodes as the user core
. When you
deploy the cluster, the key is added to the core
user’s
~/.ssh/authorized_keys
list.
You must use a local key, not one that you configured with platform-specific approaches such as AWS key pairs. |
On clusters running Fedora CoreOS (FCOS), the SSH keys specified in the Ignition config files are written to the |
If you do not have an SSH key that is configured for password-less authentication on your computer, create one. For example, on a computer that uses a Linux operating system, run the following command:
$ ssh-keygen -t ed25519 -N '' \
-f <path>/<file_name> (1)
1 | Specify the path and file name, such as ~/.ssh/id_rsa , of the new SSH key. If you have an existing key pair, ensure your public key is in the your ~/.ssh directory. |
Running this command generates an SSH key that does not require a password in the location that you specified.
If you plan to install an OKD cluster that uses FIPS Validated / Modules in Process cryptographic libraries on the |
Start the ssh-agent
process as a background task:
$ eval "$(ssh-agent -s)"
Agent pid 31874
If your cluster is in FIPS mode, only use FIPS-compliant algorithms to generate the SSH key. The key must be either RSA or eCDSA. |
Add your SSH private key to the ssh-agent
:
$ ssh-add <path>/<file_name> (1)
Identity added: /home/<you>/<path>/<file_name> (<computer_name>)
1 | Specify the path and file name for your SSH private key, such as ~/.ssh/id_rsa |
When you install OKD, provide the SSH public key to the installation program. If you install a cluster on infrastructure that you provision, you must provide this key to your cluster’s machines.
Before you install OKD, download the installation file on a local computer.
You have a computer that runs Linux or macOS, with 500 MB of local disk space
Download installer from https://github.com/openshift/okd/releases
The installation program creates several files on the computer that you use to install your cluster. You must keep the installation program and the files that the installation program creates after you finish installing the cluster. Both files are required to delete the cluster. |
Deleting the files created by the installation program does not remove your cluster, even if the cluster failed during installation. To remove your cluster, complete the OKD uninstallation procedures for your specific cloud provider. |
extract the installation program. For example, on a computer that uses a Linux operating system, run the following command:
$ tar xvf openshift-install-linux.tar.gz
Download your installation pull secret from the Red Hat OpenShift Cluster Manager. This pull secret allows you to authenticate with the services that are provided by the included authorities, including Quay.io, which serves the container images for OKD components.
Using a pull secret from the Red Hat OpenShift Cluster Manager is not required. You can use a pull secret for another private registry. Or, if you do not need the cluster to pull images from a private registry, you can use {"auths":{"fake":{"auth":"aWQ6cGFzcwo="}}}
as the pull secret when prompted during the installation.
If you do not use the pull secret from the Red Hat OpenShift Cluster Manager:
Red Hat Operators are not available.
The Telemetry and Insights operators do not send data to Red Hat.
Content from the Red Hat Container Catalog registry, such as image streams and Operators, are not available.
For installations of OKD that use user-provisioned infrastructure, you manually generate your installation configuration file.
Obtain the OKD installation program and the access token for your cluster.
Create an installation directory to store your required installation assets in:
$ mkdir <installation_directory>
You must create a directory. Some installation assets, like bootstrap X.509 certificates have short expiration intervals, so you must not reuse an installation directory. If you want to reuse individual files from another cluster installation, you can copy them into your directory. However, the file names for the installation assets might change between releases. Use caution when copying installation files from an earlier OKD version. |
Customize the following install-config.yaml
file template and save
it in the <installation_directory>
.
You must name this configuration file |
Back up the install-config.yaml
file so that you can use it to install
multiple clusters.
The |
install-config.yaml
file for VMware vSphereYou can customize the install-config.yaml
file to specify more details about
your OKD cluster’s platform or modify the values of the required
parameters.
apiVersion: v1
baseDomain: example.com (1)
compute:
- hyperthreading: enabled (2) (3)
name: worker
replicas: 0 (4)
controlPlane:
hyperthreading: enabled (2) (3)
name: master
replicas: 3 (5)
metadata:
name: test (6)
platform:
vsphere:
vcenter: your.vcenter.server (7)
username: username (8)
password: password (9)
datacenter: datacenter (10)
defaultDatastore: datastore (11)
folder: "/<datacenter_name>/vm/<folder_name>/<subfolder_name>" (12)
pullSecret: '{"auths":{"<local_registry>": {"auth": "<credentials>","email": "you@example.com"}}}' (13)
sshKey: 'ssh-ed25519 AAAA...' (14)
additionalTrustBundle: | (15)
-----BeGIN CeRTIFICATe-----
ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
-----eND CeRTIFICATe-----
imageContentSources: (16)
- mirrors:
- <local_registry>/<local_repository_name>/release
source: quay.io/openshift-release-dev/ocp-release
- mirrors:
- <local_registry>/<local_repository_name>/release
source: quay.io/openshift-release-dev/ocp-v4.0-art-dev
1 | The base domain of the cluster. All DNS records must be sub-domains of this base and include the cluster name. | ||
2 | The controlPlane section is a single mapping, but the compute section is a
sequence of mappings. To meet the requirements of the different data structures,
the first line of the compute section must begin with a hyphen, - , and the
first line of the controlPlane section must not. Although both sections
currently define a single machine pool, it is possible that future versions
of OKD will support defining multiple compute pools during
installation. Only one control plane pool is used. |
||
3 | Whether to enable or disable simultaneous multithreading, or
hyperthreading . By default, simultaneous multithreading is enabled
to increase the performance of your machines' cores. You can disable it by
setting the parameter value to Disabled . If you disable simultaneous
multithreading in some cluster machines, you must disable it in all cluster
machines.
|
||
4 | You must set the value of the replicas parameter to 0 . This parameter
controls the number of workers that the cluster creates and manages for you,
which are functions that the cluster does not perform when you
use user-provisioned infrastructure. You must manually deploy worker
machines for the cluster to use before you finish installing OKD. |
||
5 | The number of control plane machines that you add to the cluster. Because the cluster uses this values as the number of etcd endpoints in the cluster, the value must match the number of control plane machines that you deploy. | ||
6 | The cluster name that you specified in your DNS records. | ||
7 | The fully-qualified hostname or IP address of the vCenter server. | ||
8 | The name of the user for accessing the server. This user must have at least the roles and privileges that are required for static or dynamic persistent volume provisioning in vSphere. | ||
9 | The password associated with the vSphere user. | ||
10 | The vSphere datacenter. | ||
11 | The default vSphere datastore to use. | ||
12 | Optional: For installer-provisioned infrastructure, the absolute path of an existing folder where the installation program creates the virtual machines, for example, /<datacenter_name>/vm/<folder_name>/<subfolder_name> . If you do not provide this value, the installation program creates a top-level folder in the datacenter virtual machine folder that is named with the infrastructure ID. If you are providing the infrastructure for the cluster, omit this parameter. |
||
13 | For <local_registry> , specify the registry domain name, and optionally the
port, that your mirror registry uses to serve content. For example
registry.example.com or registry.example.com:5000 . For <credentials> ,
specify the base64-encoded user name and password for your mirror registry. |
||
14 | The public portion of the default SSH key for the core user in
Fedora CoreOS (FCOS).
|
||
15 | Provide the contents of the certificate file that you used for your mirror registry. | ||
16 | Provide the imageContentSources section from the output of the command to
mirror the repository. |
Production environments can deny direct access to the Internet and instead have
an HTTP or HTTPS proxy available. You can configure a new OKD
cluster to use a proxy by configuring the proxy settings in the
install-config.yaml
file.
You have an existing install-config.yaml
file.
You reviewed the sites that your cluster requires access to and determined whether any of them need to bypass the proxy. By default, all cluster egress traffic is proxied, including calls to hosting cloud provider APIs. You added sites to the Proxy
object’s spec.noProxy
field to bypass the proxy if necessary.
The For installations on Amazon Web Services (AWS), Google Cloud Platform (GCP), Microsoft Azure, and Red Hat OpenStack Platform (RHOSP), the |
edit your install-config.yaml
file and add the proxy settings. For example:
apiVersion: v1
baseDomain: my.domain.com
proxy:
httpProxy: http://<username>:<pswd>@<ip>:<port> (1)
httpsProxy: https://<username>:<pswd>@<ip>:<port> (2)
noProxy: example.com (3)
additionalTrustBundle: | (4)
-----BeGIN CeRTIFICATe-----
<MY_TRUSTeD_CA_CeRT>
-----eND CeRTIFICATe-----
...
1 | A proxy URL to use for creating HTTP connections outside the cluster. The
URL scheme must be http . |
2 | A proxy URL to use for creating HTTPS connections outside the cluster. |
3 | A comma-separated list of destination domain names, IP addresses, or
other network CIDRs to exclude from proxying. Preface a domain with . to match subdomains only. For example, .y.com matches x.y.com , but not y.com . Use * to bypass the proxy for all destinations.
You must include vCenter’s IP address and the IP range that you use for its machines. |
4 | If provided, the installation program generates a config map that is named user-ca-bundle in
the openshift-config namespace to hold the additional CA
certificates. If you provide additionalTrustBundle and at least one proxy setting, the Proxy object is configured to reference the user-ca-bundle config map in the trustedCA field. The Cluster Network
Operator then creates a trusted-ca-bundle config map that merges the contents specified for the trustedCA parameter
with the FCOS trust bundle. The additionalTrustBundle field is required unless
the proxy’s identity certificate is signed by an authority from the FCOS trust
bundle. |
The installation program does not support the proxy |
Save the file and reference it when installing OKD.
The installation program creates a cluster-wide proxy that is named cluster
that uses the proxy
settings in the provided install-config.yaml
file. If no proxy settings are
provided, a cluster
Proxy
object is still created, but it will have a nil
spec
.
Only the |
Because you must modify some cluster definition files and manually start the cluster machines, you must generate the Kubernetes manifest and Ignition config files that the cluster needs to make its machines.
The installation configuration file transforms into the Kubernetes manifests. The manifests wrap into the Ignition configuration files, which are later used to create the cluster.
|
You obtained the OKD installation program.
You created the install-config.yaml
installation configuration file.
Change to the directory that contains the installation program and generate the Kubernetes manifests for the cluster:
$ ./openshift-install create manifests --dir <installation_directory> (1)
1 | For <installation_directory> , specify the installation directory that
contains the install-config.yaml file you created. |
Remove the Kubernetes manifest files that define the control plane machines and compute machine sets:
$ rm -f openshift/99_openshift-cluster-api_master-machines-*.yaml openshift/99_openshift-cluster-api_worker-machineset-*.yaml
Because you create and manage these resources yourself, you do not have to initialize them.
You can preserve the machine set files to create compute machines by using the machine API, but you must update references to them to match your environment.
Check that the mastersSchedulable
parameter in the <installation_directory>/manifests/cluster-scheduler-02-config.yml
Kubernetes manifest file is set to false
. This setting prevents pods from being scheduled on the control plane machines:
Open the <installation_directory>/manifests/cluster-scheduler-02-config.yml
file.
Locate the mastersSchedulable
parameter and ensure that it is set to false
.
Save and exit the file.
To create the Ignition configuration files, run the following command from the directory that contains the installation program:
$ ./openshift-install create ignition-configs --dir <installation_directory> (1)
1 | For <installation_directory> , specify the same installation directory. |
The following files are generated in the directory:
. ├── auth │ ├── kubeadmin-password │ └── kubeconfig ├── bootstrap.ign ├── master.ign ├── metadata.json └── worker.ign
The Ignition config files contain a unique cluster identifier that you can use to uniquely identify your cluster in VMware Cloud on AWS. If you plan to use the cluster identifier as the name of your virtual machine folder, you must extract it.
You obtained the OKD installation program and the pull secret for your cluster.
You generated the Ignition config files for your cluster.
You installed the jq
package.
To extract and view the infrastructure name from the Ignition config file metadata, run the following command:
$ jq -r .infraID <installation_directory>/metadata.json (1)
1 | For <installation_directory> , specify the path to the directory that you stored the
installation files in. |
openshift-vw9j6 (1)
1 | The output of this command is your cluster name and a random string. |
Before you install a cluster that contains user-provisioned infrastructure on VMware vSphere, you must create FCOS machines on vSphere hosts for it to use.
You have obtained the Ignition config files for your cluster.
You have access to an HTTP server that you can access from your computer and that the machines that you create can access.
You have created a vSphere cluster.
Upload the bootstrap Ignition config file, which is named <installation_directory>/bootstrap.ign
, that the installation program created to your HTTP server. Note the URL of this file.
Save the following secondary Ignition config file for your bootstrap node to your computer as <installation_directory>/merge-bootstrap.ign
:
{
"ignition": {
"config": {
"merge": [
{
"source": "<bootstrap_ignition_config_url>", (1)
"verification": {}
}
]
},
"timeouts": {},
"version": "3.1.0"
},
"networkd": {},
"passwd": {},
"storage": {},
"systemd": {}
}
1 | Specify the URL of the bootstrap Ignition config file that you hosted. |
When you create the virtual machine (VM) for the bootstrap machine, you use this Ignition config file.
Locate the following Ignition config files that the installation program created:
<installation_directory>/master.ign
<installation_directory>/worker.ign
<installation_directory>/merge-bootstrap.ign
Convert the Ignition config files to Base64 encoding. Later in this procedure, you must add these files to the extra configuration parameter guestinfo.ignition.config.data
in your VM.
For example, if you use a Linux operating system, you can use the base64
command to encode the files.
$ base64 -w0 <installation_directory>/master.ign > <installation_directory>/master.64
$ base64 -w0 <installation_directory>/worker.ign > <installation_directory>/worker.64
$ base64 -w0 <installation_directory>/merge-bootstrap.ign > <installation_directory>/merge-bootstrap.64
If you plan to add more compute machines to your cluster after you finish installation, do not delete these files. |
Obtain the FCOS images from the FCOS Downloads page
In the vSphere Client, create a folder in your datacenter to store your VMs.
Click the VMs and Templates view.
Right-click the name of your datacenter.
Click New Folder → New VM and Template Folder.
In the window that is displayed, enter the folder name. If you did not specify an existing folder in the install-config.yaml
file, then create a folder with the same name as the infrastructure ID. You use this folder name so vCenter dynamically provisions storage in the appropriate location for its Workspace configuration.
In the vSphere Client, create a template for the OVA image and then clone the template as needed.
In the following steps, you create a template and then clone the template for all of your cluster machines. You then provide the location for the Ignition config file for that cloned machine type when you provision the VMs. |
From the Hosts and Clusters tab, right-click your cluster name and select Deploy OVF Template.
On the Select an OVF tab, specify the name of the FCOS OVA file that you downloaded.
On the Select a name and folder tab, set a Virtual machine name for your template, such as Template-FCOS
. Click the name of your vSphere cluster and select the folder you created in the previous step.
On the Select a compute resource tab, click the name of your vSphere cluster.
On the Select storage tab, configure the storage options for your VM.
Select Thin Provision or Thick Provision, based on your storage preferences.
Select the datastore that you specified in your install-config.yaml
file.
On the Select network tab, specify the network that you configured for the cluster, if available.
When creating the OVF template, do not specify values on the Customize template tab or configure the template any further.
Do not start the original VM template. The VM template must remain off and must be cloned for new FCOS machines. Starting the VM template configures the VM template as a VM on the platform, which prevents it from being used as a template that machine sets can apply configurations to. |
After the template deploys, deploy a VM for a machine in the cluster.
Right-click the template name and click Clone → Clone to Virtual Machine.
On the Select a name and folder tab, specify a name for the VM. You might include the machine type in the name, such as control-plane-0
or compute-1
.
On the Select a name and folder tab, select the name of the folder that you created for the cluster.
On the Select a compute resource tab, select the name of a host in your datacenter.
For a bootstrap machine, specify the URL of the bootstrap Ignition config file that you hosted.
Optional: On the Select storage tab, customize the storage options.
On the Select clone options, select Customize this virtual machine’s hardware.
On the Customize hardware tab, click VM Options → Advanced.
Optional: Override default DHCP networking in vSphere. To enable static IP networking:
Set your static IP configuration:
$ export IPCFG="ip=<ip>::<gateway>:<netmask>:<hostname>:<iface>:none nameserver=srv1 [nameserver=srv2 [nameserver=srv3 [...]]]"
$ export IPCFG="ip=192.168.100.101::192.168.100.254:255.255.255.0:::none nameserver=8.8.8.8"
Set the guestinfo.afterburn.initrd.network-kargs
property before booting a VM from an OVA in vSphere:
$ govc vm.change -vm "<vm_name>" -e "guestinfo.afterburn.initrd.network-kargs=${IPCFG}"
Optional: In the event of cluster performance issues, from the Latency Sensitivity list, select High. ensure that your VM’s CPU and memory reservation have the following values:
Memory reservation value must be equal to its configured memory size.
CPU reservation value must be at least the number of low latency virtual CPUs multiplied by the measured physical CPU speed.
Click edit Configuration, and on the Configuration Parameters window, click Add Configuration Params. Define the following parameter names and values:
guestinfo.ignition.config.data
: Locate the base-64 encoded files that you created previously in this procedure, and paste the contents of the base64-encoded Ignition config file for this machine type.
guestinfo.ignition.config.data.encoding
: Specify base64
.
disk.enableUUID
: Specify TRUe
.
In the Virtual Hardware panel of the Customize hardware tab, modify the specified values as required. ensure that the amount of RAM, CPU, and disk storage meets the minimum requirements for the machine type.
Complete the configuration and power on the VM.
Create the rest of the machines for your cluster by following the preceding steps for each machine.
You must create the bootstrap and control plane machines at this time. Because some pods are deployed on compute machines by default, also create at least two compute machines before you install the cluster. |
You can create more compute machines for your cluster that uses user-provisioned infrastructure on VMware vSphere.
Obtain the base64-encoded Ignition file for your compute machines.
You have access to the vSphere template that you created for your cluster.
After the template deploys, deploy a VM for a machine in the cluster.
Right-click the template’s name and click Clone → Clone to Virtual Machine.
On the Select a name and folder tab, specify a name for the VM. You might include the machine type in the name, such as compute-1
.
On the Select a name and folder tab, select the name of the folder that you created for the cluster.
On the Select a compute resource tab, select the name of a host in your datacenter.
Optional: On the Select storage tab, customize the storage options.
On the Select clone options, select Customize this virtual machine’s hardware.
On the Customize hardware tab, click VM Options → Advanced.
From the Latency Sensitivity list, select High.
Click edit Configuration, and on the Configuration Parameters window, click Add Configuration Params. Define the following parameter names and values:
guestinfo.ignition.config.data
: Paste the contents of the base64-encoded compute Ignition config file for this machine type.
guestinfo.ignition.config.data.encoding
: Specify base64
.
disk.enableUUID
: Specify TRUe
.
In the Virtual Hardware panel of the Customize hardware tab, modify the specified values as required. ensure that the amount of RAM, CPU, and disk storage meets the minimum requirements for the machine type. Also, make sure to select the correct network under Add network adapter if there are multiple networks available.
Complete the configuration and power on the VM.
Continue to create more compute machines for your cluster.
In most cases, data partitions are originally created by installing FCOS, rather than by installing another operating system. In such cases, the OKD installer should be allowed to configure your disk partitions.
However, there are two cases where you might want to intervene to override the default partitioning when installing an OKD node:
Create separate partitions: For greenfield installations on an empty
disk, you might want to add separate storage to a partition. This is
officially supported for making /var
or a subdirectory of /var
, such as /var/lib/etcd
, a separate partition, but not both.
Kubernetes supports only two filesystem partitions. If you add more than one partition to the original configuration, Kubernetes cannot monitor all of them. |
Retain existing partitions: For a brownfield installation where you are reinstalling OKD on an existing node and want to retain data partitions installed from your previous operating system, there are both boot arguments and options to coreos-installer
that allow you to retain existing data partitions.
/var
partitionIn general, disk partitioning for OKD should be left to the installer. However, there are cases where you might want to create separate partitions in a part of the filesystem that you expect to grow.
OKD supports the addition of a single partition to attach
storage to either the /var
partition or a subdirectory of /var
.
For example:
/var/lib/containers
: Holds container-related content that can grow
as more images and containers are added to a system.
/var/lib/etcd
: Holds data that you might want to keep separate for purposes such as performance optimization of etcd storage.
/var
: Holds data that you might want to keep separate for purposes such as auditing.
Storing the contents of a /var
directory separately makes it easier to grow storage for those areas as needed and reinstall OKD at a later date and keep that data intact. With this method, you will not have to pull all your containers again, nor will you have to copy massive log files when you update systems.
Because /var
must be in place before a fresh installation of
Fedora CoreOS (FCOS), the following procedure sets up the separate /var
partition
by creating a machine config that is inserted during the openshift-install
preparation phases of an OKD installation.
Create a directory to hold the OKD installation files:
$ mkdir $HOMe/clusterconfig
Run openshift-install
to create a set of files in the manifest
and
openshift
subdirectories. Answer the system questions as you are prompted:
$ openshift-install create manifests --dir $HOMe/clusterconfig
? SSH Public Key ...
$ ls $HOMe/clusterconfig/openshift/
99_kubeadmin-password-secret.yaml
99_openshift-cluster-api_master-machines-0.yaml
99_openshift-cluster-api_master-machines-1.yaml
99_openshift-cluster-api_master-machines-2.yaml
...
Create a MachineConfig
object and add it to a file in the openshift
directory.
For example, name the file 98-var-partition.yaml
, change the disk device name to the name of the storage device on the worker
systems, and set the storage size as appropriate. This example places the /var
directory on a separate partition:
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
labels:
machineconfiguration.openshift.io/role: worker
name: 98-var-partition
spec:
config:
ignition:
version: 3.1.0
storage:
disks:
- device: /dev/<device_name> (1)
partitions:
- label: var
startMiB: <partition_start_offset> (2)
sizeMiB: <partition_size> (3)
filesystems:
- device: /dev/disk/by-partlabel/var
path: /var
format: xfs
systemd:
units:
- name: var.mount (4)
enabled: true
contents: |
[Unit]
Before=local-fs.target
[Mount]
What=/dev/disk/by-partlabel/var
Where=/var
Options=defaults,prjquota (5)
[Install]
WantedBy=local-fs.target
1 | The storage device name of the disk that you want to partition. |
2 | When adding a data partition to the boot disk, a minimum value of 25000 mebibytes is recommended. The root file system is automatically resized to fill all available space up to the specified offset. If no value is specified, or if the specified value is smaller than the recommended minimum, the resulting root file system will be too small, and future reinstalls of FCOS might overwrite the beginning of the data partition. |
3 | The size of the data partition in mebibytes. |
4 | The name of the mount unit must match the directory specified in the Where= directive. For example, for a filesystem mounted on /var/lib/containers , the unit must be named var-lib-containers.mount . |
5 | The prjquota mount option must be enabled for filesystems used for container storage. |
When creating a separate |
Run openshift-install
again to create Ignition configs from a set of files in the manifest
and openshift
subdirectories:
$ openshift-install create ignition-configs --dir $HOMe/clusterconfig
$ ls $HOMe/clusterconfig/
auth bootstrap.ign master.ign metadata.json worker.ign
Now you can use the Ignition config files as input to the vSphere installation procedures to install Fedora CoreOS (FCOS) systems.
You can install the OpenShift CLI (oc
) in order to interact with OKD from a
command-line interface. You can install oc
on Linux, Windows, or macOS.
If you installed an earlier version of |
You can install the OpenShift CLI (oc
) binary on Linux by using the following procedure.
Navigate to https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/ and choose the folder for your operating system and architecture.
Download oc.tar.gz
.
Unpack the archive:
$ tar xvzf <file>
Place the oc
binary in a directory that is on your PATH
.
To check your PATH
, execute the following command:
$ echo $PATH
After you install the OpenShift CLI, it is available using the oc
command:
$ oc <command>
You can install the OpenShift CLI (oc
) binary on Windows by using the following procedure.
Navigate to https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/ and choose the folder for your operating system and architecture.
Download oc.zip
.
Unzip the archive with a ZIP program.
Move the oc
binary to a directory that is on your PATH
.
To check your PATH
, open the command prompt and execute the following command:
C:\> path
After you install the OpenShift CLI, it is available using the oc
command:
C:\> oc <command>
You can install the OpenShift CLI (oc
) binary on macOS by using the following procedure.
Navigate to https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/ and choose the folder for your operating system and architecture.
Download oc.tar.gz
.
Unpack and unzip the archive.
Move the oc
binary to a directory on your PATH.
To check your PATH
, open a terminal and execute the following command:
$ echo $PATH
After you install the OpenShift CLI, it is available using the oc
command:
$ oc <command>
To create the OKD cluster, you wait for the bootstrap process to complete on the machines that you provisioned by using the Ignition config files that you generated with the installation program.
Create the required infrastructure for the cluster.
You obtained the installation program and generated the Ignition config files for your cluster.
You used the Ignition config files to create FCOS machines for your cluster.
Your machines have direct Internet access or have an HTTP or HTTPS proxy available.
Monitor the bootstrap process:
$ ./openshift-install --dir <installation_directory> wait-for bootstrap-complete \ (1)
--log-level=info (2)
1 | For <installation_directory> , specify the path to the directory that you stored the installation files in. |
2 | To view different installation details, specify warn , debug , or error instead of info . |
INFO Waiting up to 30m0s for the Kubernetes API at https://api.test.example.com:6443...
INFO API v1.19.0 up
INFO Waiting up to 30m0s for bootstrapping to complete...
INFO It is now safe to remove the bootstrap resources
The command succeeds when the Kubernetes API server signals that it has been bootstrapped on the control plane machines.
After bootstrap process is complete, remove the bootstrap machine from the load balancer.
You must remove the bootstrap machine from the load balancer at this point. You can also remove or reformat the machine itself. |
You can log in to your cluster as a default system user by exporting the cluster kubeconfig
file.
The kubeconfig
file contains information about the cluster that is used by the CLI to connect a client to the correct cluster and API server.
The file is specific to a cluster and is created during OKD installation.
You deployed an OKD cluster.
You installed the oc
CLI.
export the kubeadmin
credentials:
$ export KUBeCONFIG=<installation_directory>/auth/kubeconfig (1)
1 | For <installation_directory> , specify the path to the directory that you stored
the installation files in. |
Verify you can run oc
commands successfully using the exported configuration:
$ oc whoami
system:admin
When you add machines to a cluster, two pending certificate signing requests (CSRs) are generated for each machine that you added. You must confirm that these CSRs are approved or, if necessary, approve them yourself. The client requests must be approved first, followed by the server requests.
You added machines to your cluster.
Confirm that the cluster recognizes the machines:
$ oc get nodes
NAMe STATUS ROLeS AGe VeRSION
master-0 Ready master 63m v1.19.0
master-1 Ready master 63m v1.19.0
master-2 Ready master 64m v1.19.0
The output lists all of the machines that you created.
The preceding output might not include the compute nodes, also known as worker nodes, until some CSRs are approved. |
Review the pending CSRs and ensure that you see the client requests with the Pending
or Approved
status for each machine that you added to the cluster:
$ oc get csr
NAMe AGe ReQUeSTOR CONDITION
csr-8b2br 15m system:serviceaccount:openshift-machine-config-operator:node-bootstrapper Pending
csr-8vnps 15m system:serviceaccount:openshift-machine-config-operator:node-bootstrapper Pending
...
In this example, two machines are joining the cluster. You might see more approved CSRs in the list.
If the CSRs were not approved, after all of the pending CSRs for the machines you added are in Pending
status, approve the CSRs for your cluster machines:
Because the CSRs rotate automatically, approve your CSRs within an hour of adding the machines to the cluster. If you do not approve them within an hour, the certificates will rotate, and more than two certificates will be present for each node. You must approve all of these certificates. Once the client CSR is approved, the Kubelet creates a secondary CSR for the serving certificate, which requires manual approval. Then, subsequent serving certificate renewal requests are automatically approved by the |
For clusters running on platforms that are not machine API enabled, such as bare metal and other user-provisioned infrastructure, you must implement a method of automatically approving the kubelet serving certificate requests (CSRs). If a request is not approved, then the |
To approve them individually, run the following command for each valid CSR:
$ oc adm certificate approve <csr_name> (1)
1 | <csr_name> is the name of a CSR from the list of current CSRs. |
To approve all pending CSRs, run the following command:
$ oc get csr -o go-template='{{range .items}}{{if not .status}}{{.metadata.name}}{{"\n"}}{{end}}{{end}}' | xargs --no-run-if-empty oc adm certificate approve
Some Operators might not become available until some CSRs are approved. |
Now that your client requests are approved, you must review the server requests for each machine that you added to the cluster:
$ oc get csr
NAMe AGe ReQUeSTOR CONDITION
csr-bfd72 5m26s system:node:ip-10-0-50-126.us-east-2.compute.internal Pending
csr-c57lv 5m26s system:node:ip-10-0-95-157.us-east-2.compute.internal Pending
...
If the remaining CSRs are not approved, and are in the Pending
status, approve the CSRs for your cluster machines:
To approve them individually, run the following command for each valid CSR:
$ oc adm certificate approve <csr_name> (1)
1 | <csr_name> is the name of a CSR from the list of current CSRs. |
To approve all pending CSRs, run the following command:
$ oc get csr -o go-template='{{range .items}}{{if not .status}}{{.metadata.name}}{{"\n"}}{{end}}{{end}}' | xargs oc adm certificate approve
After all client and server CSRs have been approved, the machines have the Ready
status. Verify this by running the following command:
$ oc get nodes
NAMe STATUS ROLeS AGe VeRSION
master-0 Ready master 73m v1.20.0
master-1 Ready master 73m v1.20.0
master-2 Ready master 74m v1.20.0
worker-0 Ready worker 11m v1.20.0
worker-1 Ready worker 11m v1.20.0
It can take a few minutes after approval of the server CSRs for the machines to transition to the |
For more information on CSRs, see Certificate Signing Requests.
After the control plane initializes, you must immediately configure some Operators so that they all become available.
Your control plane has initialized.
Watch the cluster components come online:
$ watch -n5 oc get clusteroperators
NAMe VeRSION AVAILABLe PROGReSSING DeGRADeD SINCe
authentication 4.6.0 True False False 3h56m
cloud-credential 4.6.0 True False False 29h
cluster-autoscaler 4.6.0 True False False 29h
config-operator 4.6.0 True False False 6h39m
console 4.6.0 True False False 3h59m
csi-snapshot-controller 4.6.0 True False False 4h12m
dns 4.6.0 True False False 4h15m
etcd 4.6.0 True False False 29h
image-registry 4.6.0 True False False 3h59m
ingress 4.6.0 True False False 4h30m
insights 4.6.0 True False False 29h
kube-apiserver 4.6.0 True False False 29h
kube-controller-manager 4.6.0 True False False 29h
kube-scheduler 4.6.0 True False False 29h
kube-storage-version-migrator 4.6.0 True False False 4h2m
machine-api 4.6.0 True False False 29h
machine-approver 4.6.0 True False False 6h34m
machine-config 4.6.0 True False False 3h56m
marketplace 4.6.0 True False False 4h2m
monitoring 4.6.0 True False False 6h31m
network 4.6.0 True False False 29h
node-tuning 4.6.0 True False False 4h30m
openshift-apiserver 4.6.0 True False False 3h56m
openshift-controller-manager 4.6.0 True False False 4h36m
openshift-samples 4.6.0 True False False 4h30m
operator-lifecycle-manager 4.6.0 True False False 29h
operator-lifecycle-manager-catalog 4.6.0 True False False 29h
operator-lifecycle-manager-packageserver 4.6.0 True False False 3h59m
service-ca 4.6.0 True False False 29h
storage 4.6.0 True False False 4h30m
Configure the Operators that are not available.
On platforms that do not provide shareable object storage, the OpenShift Image
Registry Operator bootstraps itself as Removed
. This allows
openshift-installer
to complete installations on these platform types.
After installation, you must edit the Image Registry Operator configuration to
switch the managementState
from Removed
to Managed
.
The Prometheus console provides an "Image Registry has been removed. |
The Image Registry Operator is not initially available for platforms that do not provide default storage. After installation, you must configure your registry to use storage so that the Registry Operator is made available.
Instructions are shown for configuring a persistent volume, which is required for production clusters. Where applicable, instructions are shown for configuring an empty directory as the storage location, which is available for only non-production clusters.
Additional instructions are provided for allowing the image registry to use block storage types by using the Recreate
rollout strategy during upgrades.
As a cluster administrator, following installation you must configure your registry to use storage.
Cluster administrator permissions.
A cluster on VMware vSphere.
Persistent storage provisioned for your cluster, such as Red Hat OpenShift Container Storage.
OKD supports |
Must have "100Gi" capacity.
Testing shows issues with using the NFS server on RHeL as storage backend for core services. This includes the OpenShift Container Registry and Quay, Prometheus for monitoring storage, and elasticsearch for logging storage. Therefore, using RHeL NFS to back PVs used by core services is not recommended. Other NFS implementations on the marketplace might not have these issues. Contact the individual NFS implementation vendor for more information on any testing that was possibly completed against these OKD core components. |
To configure your registry to use storage, change the spec.storage.pvc
in the configs.imageregistry/cluster
resource.
When using shared storage, review your security settings to prevent outside access. |
Verify that you do not have a registry pod:
$ oc get pod -n openshift-image-registry
If the storage type is |
Check the registry configuration:
$ oc edit configs.imageregistry.operator.openshift.io
storage:
pvc:
claim: (1)
1 | Leave the claim field blank to allow the automatic creation of an image-registry-storage PVC. |
Check the clusteroperator
status:
$ oc get clusteroperator image-registry
You must configure storage for the Image Registry Operator. For non-production clusters, you can set the image registry to an empty directory. If you do so, all images are lost if you restart the registry.
To set the image registry storage to an empty directory:
$ oc patch configs.imageregistry.operator.openshift.io cluster --type merge --patch '{"spec":{"storage":{"emptyDir":{}}}}'
Configure this option for only non-production clusters. |
If you run this command before the Image Registry Operator initializes its
components, the oc patch
command fails with the following error:
error from server (NotFound): configs.imageregistry.operator.openshift.io "cluster" not found
Wait a few minutes and run the command again.
To allow the image registry to use block storage types such as vSphere Virtual Machine Disk (VMDK) during upgrades as a cluster administrator, you can use the Recreate
rollout strategy.
Block storage volumes are supported but not recommended for use with image registry on production clusters. An installation where the registry is configured on block storage is not highly available because the registry cannot have more than one replica. |
To set the image registry storage as a block storage type, patch the registry so that it uses the Recreate
rollout strategy and runs with only 1
replica:
$ oc patch config.imageregistry.operator.openshift.io/cluster --type=merge -p '{"spec":{"rolloutStrategy":"Recreate","replicas":1}}'
Provision the PV for the block storage device, and create a PVC for that volume. The requested block volume uses the ReadWriteOnce (RWO) access mode.
Create a pvc.yaml
file with the following contents to define a VMware vSphere PersistentVolumeClaim
object:
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: image-registry-storage (1)
namespace: openshift-image-registry (2)
spec:
accessModes:
- ReadWriteOnce (3)
resources:
requests:
storage: 100Gi (4)
1 | A unique name that represents the PersistentVolumeClaim object. |
2 | The namespace for the PersistentVolumeClaim object, which is openshift-image-registry . |
3 | The access mode of the persistent volume claim. With ReadWriteOnce , the volume can be mounted with read and write permissions by a single node. |
4 | The size of the persistent volume claim. |
Create the PersistentVolumeClaim
object from the file:
$ oc create -f pvc.yaml -n openshift-image-registry
edit the registry configuration so that it references the correct PVC:
$ oc edit config.imageregistry.operator.openshift.io -o yaml
storage:
pvc:
claim: (1)
1 | Creating a custom PVC allows you to leave the claim field blank for the default automatic creation of an image-registry-storage PVC. |
For instructions about configuring registry storage so that it references the correct PVC, see Configuring the registry for vSphere.
After you complete the Operator configuration, you can finish installing the cluster on infrastructure that you provide.
Your control plane has initialized.
You have completed the initial Operator configuration.
Confirm that all the cluster components are online with the following command:
$ watch -n5 oc get clusteroperators
NAMe VeRSION AVAILABLe PROGReSSING DeGRADeD SINCe
authentication 4.6.0 True False False 3h56m
cloud-credential 4.6.0 True False False 29h
cluster-autoscaler 4.6.0 True False False 29h
config-operator 4.6.0 True False False 6h39m
console 4.6.0 True False False 3h59m
csi-snapshot-controller 4.6.0 True False False 4h12m
dns 4.6.0 True False False 4h15m
etcd 4.6.0 True False False 29h
image-registry 4.6.0 True False False 3h59m
ingress 4.6.0 True False False 4h30m
insights 4.6.0 True False False 29h
kube-apiserver 4.6.0 True False False 29h
kube-controller-manager 4.6.0 True False False 29h
kube-scheduler 4.6.0 True False False 29h
kube-storage-version-migrator 4.6.0 True False False 4h2m
machine-api 4.6.0 True False False 29h
machine-approver 4.6.0 True False False 6h34m
machine-config 4.6.0 True False False 3h56m
marketplace 4.6.0 True False False 4h2m
monitoring 4.6.0 True False False 6h31m
network 4.6.0 True False False 29h
node-tuning 4.6.0 True False False 4h30m
openshift-apiserver 4.6.0 True False False 3h56m
openshift-controller-manager 4.6.0 True False False 4h36m
openshift-samples 4.6.0 True False False 4h30m
operator-lifecycle-manager 4.6.0 True False False 29h
operator-lifecycle-manager-catalog 4.6.0 True False False 29h
operator-lifecycle-manager-packageserver 4.6.0 True False False 3h59m
service-ca 4.6.0 True False False 29h
storage 4.6.0 True False False 4h30m
Alternatively, the following command notifies you when all of the clusters are available. It also retrieves and displays credentials:
$ ./openshift-install --dir <installation_directory> wait-for install-complete (1)
1 | For <installation_directory> , specify the path to the directory that you
stored the installation files in. |
INFO Waiting up to 30m0s for the cluster to initialize...
The command succeeds when the Cluster Version Operator finishes deploying the OKD cluster from Kubernetes API server.
|
Confirm that the Kubernetes API server is communicating with the pods.
To view a list of all pods, use the following command:
$ oc get pods --all-namespaces
NAMeSPACe NAMe ReADY STATUS ReSTARTS AGe
openshift-apiserver-operator openshift-apiserver-operator-85cb746d55-zqhs8 1/1 Running 1 9m
openshift-apiserver apiserver-67b9g 1/1 Running 0 3m
openshift-apiserver apiserver-ljcmx 1/1 Running 0 1m
openshift-apiserver apiserver-z25h4 1/1 Running 0 2m
openshift-authentication-operator authentication-operator-69d5d8bf84-vh2n8 1/1 Running 0 5m
...
View the logs for a pod that is listed in the output of the previous command by using the following command:
$ oc logs <pod_name> -n <namespace> (1)
1 | Specify the pod name and namespace, as shown in the output of the previous command. |
If the pod logs display, the Kubernetes API server can communicate with the cluster machines.
You can add extra compute machines after the cluster installation is completed by following Adding compute machines to vSphere.
OKD provisions new volumes as independent persistent disks to freely attach and detach the volume on any node in the cluster. As a consequence, it is not possible to back up volumes that use snapshots, or to restore volumes from snapshots. See Snapshot Limitations for more information.
To create a backup of persistent volumes:
Stop the application that is using the persistent volume.
Clone the persistent volume.
Restart the application.
Create a backup of the cloned volume.
Delete the cloned volume.
See About remote health monitoring for more information about the Telemetry service
If necessary, you can opt out of remote health reporting.