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Automated Upgrades - Upgrading | Installation and Configuration | OpenShift Enterprise 3.1
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Performing Automated Cluster Upgrades

Overview

Starting with OpenShift 3.0.2, if you installed using the advanced installation and the inventory file that was used is available, you can use the upgrade playbook to automate the OpenShift cluster upgrade process. If you installed using the quick installation method and a ~/.config/openshift/installer.cfg.yml file is available, you can use the installer to perform the automated upgrade.

The automated upgrade performs the following steps for you:

  • Applies the latest configuration.

  • Upgrades and restart master services.

  • Upgrades and restart node services.

  • Applies the latest cluster policies.

  • Updates the default router if one exists.

  • Updates the default registry if one exists.

  • Updates default image streams and InstantApp templates.

Running Ansible playbooks with the --tags or --check options is not supported by Red Hat.

Preparing for an Automated Upgrade

  1. If you are upgrading from OpenShift Enterprise 3.0 to 3.1, on each master and node host you must manually disable the 3.0 channel and enable the 3.1 channel:

    # subscription-manager repos --disable="rhel-7-server-ose-3.0-rpms" \
    --enable="rhel-7-server-ose-3.1-rpms" \
    --enable="rhel-7-server-rpms"

  2. For any upgrade path, always ensure that you have the latest version of the atomic-openshift-utils package, which should also update the openshift-ansible-* packages:

    # yum update atomic-openshift-utils

  3. Install or update to the following latest available *-excluder packages on each RHEL 7 system, which helps ensure your systems stay on the correct versions of atomic-openshift and docker packages when you are not trying to upgrade, according to the OpenShift Enterprise version:

    # yum install atomic-openshift-excluder atomic-openshift-docker-excluder

    These packages add entries to the exclude directive in the host’s /etc/yum.conf file.

  4. You must be logged in as a cluster administrative user on the master host for the upgrade to succeed:

    $ oc login

There are two methods for running the automated upgrade: using the installer or running the upgrade playbook directly. Choose and follow one method.

Using the Installer to Upgrade

If you installed OpenShift using the quick installation method, you should have an installation configuration file located at ~/.config/openshift/installer.cfg.yml. The installer requires this file to start an upgrade.

The installer currently only supports upgrading from OpenShift Enterprise 3.0 to 3.1. See Upgrading to OpenShift Enterprise 3.1 Asynchronous Releases for instructions on using Ansible directly.

If you have an older format installation configuration file in ~/.config/openshift/installer.cfg.yml from an existing OpenShift Enterprise 3.0 installation, the installer will attempt to upgrade the file to the new supported format. If you do not have an installation configuration file of any format, you can create one manually.

To start the upgrade, run the installer with the upgrade subcommand:

  1. Satisfy the steps in Preparing for an Automated Upgrade to ensure you are using the latest upgrade playbooks.

  2. Run the following command on each host to remove the atomic-openshift packages from the list of yum excludes on the host:

    # atomic-openshift-excluder unexclude

  3. Run the installer with the upgrade subcommand:

    # atomic-openshift-installer upgrade

  4. Follow the on-screen instructions to upgrade to the latest release.

  5. After all master and node upgrades have completed, a recommendation will be printed to reboot all hosts. Before rebooting, run the following command on each master and node host to add the atomic-openshift packages back to the list of yum excludes on the host:

    # atomic-openshift-excluder exclude

    Then reboot all hosts.

  6. After rebooting, continue to Updating Master and Node Certificates.

Running the Upgrade Playbook Directly

Alternatively, you can run the upgrade playbook with Ansible directly, similar to the advanced installation method, if you have an inventory file.

Upgrading to OpenShift Enterprise 3.1.0

Before running the upgrade, first update your inventory file to change the deployment_type parameter from enterprise to openshift-enterprise; this is required when upgrading from OpenShift Enterprise 3.0 to 3.1:

Before running the upgrade, first ensure the deployment_type parameter in your inventory file is set to openshift-enterprise.

If you have multiple masters configured and want to enable rolling, full system restarts of the hosts, you can set the openshift_rolling_restart_mode parameter in your inventory file to system. Otherwise, the default value services performs rolling service restarts on HA masters, but does not reboot the systems. See Configuring Cluster Variables for details.

Then, run the v3_0_to_v3_1 upgrade playbook. If your inventory file is located somewhere other than the default /etc/ansible/hosts, add the -i flag to specify the location. If you previously used the atomic-openshift-installer command to run your installation, you can check ~/.config/openshift/.ansible/hosts for the last inventory file that was used, if needed.

# ansible-playbook [-i </path/to/inventory/file>] \
    /usr/share/ansible/openshift-ansible/playbooks/byo/openshift-cluster/upgrades/v3_0_to_v3_1/upgrade.yml

When the upgrade finishes, a recommendation will be printed to reboot all hosts. After rebooting, continue to Updating Master and Node Certificates.

Upgrading to OpenShift Enterprise 3.1 Asynchronous Releases

To apply asynchronous errata updates to an existing OpenShift Enterprise 3.1 cluster, first upgrade the atomic-openshift-utils package on the Red Hat Enterprise Linux 7 system where you will be running Ansible:

# yum update atomic-openshift-utils

Then, run the v3_1_minor upgrade playbook. If your inventory file is located somewhere other than the default /etc/ansible/hosts, add the -i flag to specify the location. If you previously used the atomic-openshift-installer command to run your installation, you can check ~/.config/openshift/.ansible/hosts for the last inventory file that was used, if needed.

# ansible-playbook [-i </path/to/inventory/file>] \
    /usr/share/ansible/openshift-ansible/playbooks/byo/openshift-cluster/upgrades/v3_1_minor/upgrade.yml

When the upgrade finishes, a recommendation will be printed to reboot all hosts. After rebooting, continue to Verifying the Upgrade.

Updating Master and Node Certificates

The following steps may be required for any OpenShift cluster that was originally installed prior to the OpenShift Enterprise 3.1 release. This may include any and all updates from that version.

Node Certificates

With the 3.1 release, certificates for each of the kubelet nodes were updated to include the IP address of the node. Any node certificates generated before the 3.1 release may not contain the IP address of the node.

If a node is missing the IP address as part of its certificate, clients may refuse to connect to the kubelet endpoint. Usually this will result in errors regarding the certificate not containing an IP SAN.

In order to remedy this situation, you may need to manually update the certificates for your node.

Checking the Node’s Certificate

The following command can be used to determine which Subject Alternative Names (SANs) are present in the node’s serving certificate. In this example, the Subject Alternative Names are mynode, mynode.mydomain.com, and 1.2.3.4:

# openssl x509 -in /etc/origin/node/server.crt -text -noout | grep -A 1 "Subject Alternative Name"
X509v3 Subject Alternative Name:
DNS:mynode, DNS:mynode.mydomain.com, IP: 1.2.3.4

Ensure that the nodeIP value set in the /etc/origin/node/node-config.yaml file is present in the IP values from the Subject Alternative Names listed in the node’s serving certificate. If the nodeIP is not present, then it will need to be added to the node’s certificate.

If the nodeIP value is already contained within the Subject Alternative Names, then no further steps are required.

You will need to know the Subject Alternative Names and nodeIP value for the following steps.

Generating a New Node Certificate

If your current node certificate does not contain the proper IP address, then you must regenerate a new certificate for your node.

Node certificates will be regenerated on the master (or first master) and are then copied into place on node systems.

  1. Create a temporary directory in which to perform the following steps:

    # mkdir /tmp/node_certificate_update
# cd /tmp/node_certificate_update

  2. Export the signing options:

    # export signing_opts="--signer-cert=/etc/origin/master/ca.crt \
    --signer-key=/etc/origin/master/ca.key \
    --signer-serial=/etc/origin/master/ca.serial.txt"

  3. Generate the new certificate:

    # oadm ca create-server-cert --cert=server.crt \
  --key=server.key $signing_opts \
  --hostnames=<existing_SANs>,<nodeIP>

    For example, if the Subject Alternative Names from before were mynode, mynode.mydomain.com, and 1.2.3.4, and the nodeIP was 10.10.10.1, then you would need to run the following command:

    # oadm ca create-server-cert --cert=server.crt \
  --key=server.key $signing_opts \
  --hostnames=mynode,mynode.mydomain.com,1.2.3.4,10.10.10.1

Replace Node Serving Certificates

Back up the existing /etc/origin/node/server.crt and /etc/origin/node/server.key files for your node:

# mv /etc/origin/node/server.crt /etc/origin/node/server.crt.bak
# mv /etc/origin/node/server.key /etc/origin/node/server.key.bak

You must now copy the new server.crt and server.key created in the temporary directory during the previous step:

# mv /tmp/node_certificate_update/server.crt /etc/origin/node/server.crt
# mv /tmp/node_certificate_update/server.key /etc/origin/node/server.key

After you have replaced the node’s certificate, restart the node service:

# systemctl restart atomic-openshift-node

Master Certificates

With the 3.1 release, certificates for each of the masters were updated to include all names that pods may use to communicate with masters. Any master certificates generated before the 3.1 release may not contain these additional service names.

Checking the Master’s Certificate

The following command can be used to determine which Subject Alternative Names (SANs) are present in the master’s serving certificate. In this example, the Subject Alternative Names are mymaster, mymaster.mydomain.com, and 1.2.3.4:

# openssl x509 -in /etc/origin/master/master.server.crt -text -noout | grep -A 1 "Subject Alternative Name"
X509v3 Subject Alternative Name:
DNS:mymaster, DNS:mymaster.mydomain.com, IP: 1.2.3.4

Ensure that the following entries are present in the Subject Alternative Names for the master’s serving certificate:

Entry Example

Kubernetes service IP address

172.30.0.1

All master host names

master1.example.com

All master IP addresses

192.168.122.1

Public master host name in clustered environments

public-master.example.com

kubernetes

kubernetes.default

kubernetes.default.svc

kubernetes.default.svc.cluster.local

openshift

openshift.default

openshift.default.svc

openshift.default.svc.cluster.local

If these names are already contained within the Subject Alternative Names, then no further steps are required.

Generating a New Master Certificate

If your current master certificate does not contain all names from the list above, then you must generate a new certificate for your master:

  1. Back up the existing /etc/origin/master/master.server.crt and /etc/origin/master/master.server.key files for your master:

    # mv /etc/origin/master/master.server.crt /etc/origin/master/master.server.crt.bak
# mv /etc/origin/master/master.server.key /etc/origin/master/master.server.key.bak

  2. Export the service names. These names will be used when generating the new certificate:

    # export service_names="kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster.local,openshift,openshift.default,openshift.default.svc,openshift.default.svc.cluster.local"

  3. You will need the first IP in the services subnet (the kubernetes service IP) as well as the values of masterIP, masterURL and publicMasterURL contained in the /etc/origin/master/master-config.yaml file for the following steps.

    The kubernetes service IP can be obtained with:

    # oc get svc/kubernetes --template='{{.spec.clusterIP}}'

  4. Generate the new certificate:

    # oadm ca create-master-certs \
      --hostnames=<master_hostnames>,<master_IP_addresses>,<kubernetes_service_IP>,$service_names \ (1) (2) (3)
      --master=<internal_master_address> \ (4)
      --public-master=<public_master_address> \ (5)
      --cert-dir=/etc/origin/master/ \
      --overwrite=false
    1 Adjust <master_hostnames> to match your master host name. In a clustered environment, add all master host names.
    2 Adjust <master_IP_addresses> to match the value of masterIP. In a clustered environment, add all master IP addresses.
    3 Adjust <kubernetes_service_IP> to the first IP in the kubernetes services subnet.
    4 Adjust <internal_master_address> to match the value of masterURL.
    5 Adjust <public_master_address> to match the value of masterPublicURL.

  5. Restart master services. For single master deployments:

    # systemctl restart atomic-openshift-master

    For native HA multiple master deployments:

    # systemctl restart atomic-openshift-master-api
# systemctl restart atomic-openshift-master-controllers

    For Pacemaker HA multiple master deployments:

    # pcs resource restart master

    After the service restarts, the certificate update is complete.

Upgrading the EFK Logging Stack

If you have previously deployed the EFK logging stack and want to upgrade to the latest logging component images, the steps must be performed manually as shown in Manual Upgrades.

Verifying the Upgrade

To verify the upgrade, first check that all nodes are marked as Ready:

# oc get nodes
NAME                 LABELS                                                                STATUS
master.example.com   kubernetes.io/hostname=master.example.com,region=infra,zone=default   Ready
node1.example.com    kubernetes.io/hostname=node1.example.com,region=primary,zone=east     Ready

Then, verify that you are running the expected versions of the docker-registry and router images, if deployed:

# oc get -n default dc/docker-registry -o json | grep \"image\"
    "image": "openshift3/ose-docker-registry:v3.1.1.11",
# oc get -n default dc/router -o json | grep \"image\"
    "image": "openshift3/ose-haproxy-router:v3.1.1.11",

If you upgraded from OSE 3.0 to OSE 3.1, verify in your old /etc/sysconfig/openshift-master and /etc/sysconfig/openshift-node files that any custom configuration is added to your new /etc/sysconfig/atomic-openshift-master and /etc/sysconfig/atomic-openshift-node files.

After upgrading, you can use the experimental diagnostics tool to look for common issues:

# openshift ex diagnostics
...
[Note] Summary of diagnostics execution:
[Note] Completed with no errors or warnings seen.