- Documentation
- OpenShift Container Platform
- Backup and restore
- Disaster recovery
- Recovering from lost master hosts history
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- About
- Release notes
- Architecture
- Installing
- Mirroring images for a disconnected installation
- Installing on AWS
- Configuring an AWS account
- Manually creating IAM
- Installing a cluster quickly on AWS
- Installing a cluster on AWS with customizations
- Installing a cluster on AWS with network customizations
- Installing a cluster on AWS in a restricted network
- Installing a cluster on AWS into an existing VPC
- Installing a private cluster on AWS
- Installing a cluster on AWS using CloudFormation templates
- Installing a cluster on AWS in a restricted network with user-provisioned infrastructure
- Uninstalling a cluster on AWS
- Installing on Azure
- Configuring an Azure account
- Manually creating IAM
- Installing a cluster quickly on Azure
- Installing a cluster on Azure with customizations
- Installing a cluster on Azure with network customizations
- Installing a cluster on Azure into an existing VNet
- Installing a private cluster on Azure
- Installing a cluster on Azure using ARM templates
- Uninstalling a cluster on Azure
- Installing on GCP
- Configuring a GCP project
- Manually creating IAM
- Installing a cluster quickly on GCP
- Installing a cluster on GCP with customizations
- Installing a cluster on GCP with network customizations
- Installing a cluster on GCP in a restricted network
- Installing a cluster on GCP into an existing VPC
- Installing a private cluster on GCP
- Installing a cluster on GCP using Deployment Manager templates
- Installing a cluster on GCP using Deployment Manager templates and a shared VPC
- Installing a cluster on GCP in a restricted network with user-provisioned infrastructure
- Uninstalling a cluster on GCP
- Installing on bare metal
- Installing on IBM Z and LinuxONE
- Installing on IBM Power
- Installing on OpenStack
- Installing a cluster on OpenStack with customizations
- Installing a cluster on OpenStack with Kuryr
- Installing a cluster on OpenStack on your own infrastructure
- Installing a cluster on OpenStack with Kuryr on your own infrastructure
- Installing a cluster on OpenStack in a restricted network
- Uninstalling a cluster on OpenStack
- Uninstalling a cluster on OpenStack from your own infrastructure
- Installing on RHV
- Installing on vSphere
- Installing a cluster on vSphere
- Installing a cluster on vSphere with customizations
- Installing a cluster on vSphere with network customizations
- Installing a cluster on vSphere with user-provisioned infrastructure
- Installing a cluster on vSphere with user-provisioned infrastructure and network customizations
- Installing a cluster on vSphere in a restricted network
- Installing a cluster on vSphere in a restricted network with user-provisioned infrastructure
- Uninstalling a cluster on vSphere that uses installer-provisioned infrastructure
- Installation configuration
- Troubleshooting installation issues
- Support for FIPS cryptography
- Updating clusters
- Post-installation configuration
- Support
- Web console
- Security
- Container security
- Understanding container security
- Understanding host and VM security
- Hardening Red Hat Enterprise Linux CoreOS
- Container image signatures
- Understanding compliance
- Securing container content
- Using container registries securely
- Securing the build process
- Deploying containers
- Securing the container platform
- Securing networks
- Securing attached storage
- Monitoring cluster events and logs
- Configuring certificates
- Certificate types and descriptions
- User-provided certificates for the API server
- Proxy certificates
- Service CA certificates
- Node certificates
- Bootstrap certificates
- etcd certificates
- OLM certificates
- User-provided certificates for default ingress
- Ingress certificates
- Monitoring and cluster logging Operator component certificates
- Control plane certificates
- Viewing audit logs
- Allowing JavaScript-based access to the API server from additional hosts
- Encrypting etcd data
- Scanning pods for vulnerabilities
- Container security
- Authentication and authorization
- Understanding authentication
- Configuring the internal OAuth server
- Understanding identity provider configuration
- Configuring identity providers
- Configuring an HTPasswd identity provider
- Configuring a Keystone identity provider
- Configuring an LDAP identity provider
- Configuring a basic authentication identity provider
- Configuring a request header identity provider
- Configuring a GitHub or GitHub Enterprise identity provider
- Configuring a GitLab identity provider
- Configuring a Google identity provider
- Configuring an OpenID Connect identity provider
- Using RBAC to define and apply permissions
- Removing the kubeadmin user
- Understanding and creating service accounts
- Using service accounts in applications
- Using a service account as an OAuth client
- Scoping tokens
- Using bound service account tokens
- Managing security context constraints
- Impersonating the system:admin user
- Syncing LDAP groups
- Creating and using config maps
- Networking
- Understanding networking
- Accessing hosts
- Understanding the Cluster Network Operator
- Understanding the DNS Operator
- Understanding the Ingress Operator
- Using SCTP
- Configuring PTP hardware
- Network policy
- Multiple networks
- Understanding multiple networks
- Attaching a Pod to an additional network
- Removing a Pod from an additional network
- Configuring a bridge network
- Configuring a host-device network
- Configuring an ipvlan network
- Configuring a macvlan network with basic customizations
- Configuring a macvlan network
- Editing an additional network
- Removing an additional network
- Hardware networks
- OpenShift SDN default CNI network provider
- About the OpenShift SDN default CNI network provider
- Configuring egress IPs for a project
- Configuring an egress firewall for a project
- Editing an egress firewall for a project
- Removing an egress firewall from a project
- Considerations for the use of an egress router pod
- Deploying an egress router pod in redirect mode
- Deploying an egress router pod in HTTP proxy mode
- Deploying an egress router pod in DNS proxy mode
- Configuring an egress router pod destination list from a config map
- Enabling multicast for a project
- Disabling multicast for a project
- Configuring multitenant isolation
- Configuring kube-proxy
- OVN-Kubernetes default CNI network provider
- Configuring Routes
- Configuring ingress cluster traffic
- Configuring the cluster-wide proxy
- Configuring a custom PKI
- Load balancing on OpenStack
- Storage
- Understanding ephemeral storage
- Understanding persistent storage
- Configuring persistent storage
- Persistent storage using AWS Elastic Block Store
- Persistent storage using Azure Disk
- Persistent storage using Azure File
- Persistent storage using Cinder
- Persistent storage using Fibre Channel
- Persistent storage using FlexVolume
- Persistent storage using GCE Persistent Disk
- Persistent storage using hostPath
- Persistent Storage using iSCSI
- Persistent storage using local volumes
- Persistent storage using NFS
- Persistent storage using Red Hat OpenShift Container Storage
- Persistent storage using VMware vSphere
- Using Container Storage Interface (CSI)
- Expanding persistent volumes
- Dynamic provisioning
- Registry
- Operators
- Understanding Operators
- User tasks
- Administrator tasks
- Developing Operators
- Getting started with the Operator SDK
- Creating Ansible-based Operators
- Creating Helm-based Operators
- Generating a cluster service version (CSV)
- Working with bundle images
- Validating Operators using the scorecard
- Configuring built-in monitoring with Prometheus
- Configuring leader election
- Operator SDK CLI reference
- Appendices
- Red Hat Operators reference
- Builds
- Understanding image builds
- Understanding build configurations
- Creating build inputs
- Managing build output
- Using build strategies
- Custom image builds with Buildah
- Performing basic builds
- Triggering and modifying builds
- Performing advanced builds
- Using Red Hat subscriptions in builds
- Securing builds by strategy
- Build configuration resources
- Troubleshooting builds
- Setting up additional trusted certificate authorities for builds
- Pipelines
- Images
- Configuring the Cluster Samples Operator
- Using the Cluster Samples Operator with an alternate registry
- Understanding containers, images, and imagestreams
- Creating images
- Managing images
- Managing image streams
- Using image streams with Kubernetes resources
- Triggering updates on image stream changes
- Image configuration resources
- Using templates
- Using Ruby on Rails
- Using images
- Applications
- Machine management
- Nodes
- Working with pods
- About Pods
- Viewing Pods
- Configuring a cluster for Pods
- Automatically scaling pods with the horizontal pod autoscaler
- Automatically adjust pod resource levels with the vertical pod autoscaler
- Providing sensitive data to Pods
- Using Device Manager to make devices available to nodes
- Including pod priority in Pod scheduling decisions
- Placing pods on specific nodes using node selectors
- Controlling pod placement onto nodes (scheduling)
- About pod placement using the scheduler
- Configuring the default scheduler to control pod placement
- Placing pods relative to other pods using pod affinity and anti-affinity rules
- Controlling pod placement on nodes using node affinity rules
- Placing pods onto overcommited nodes
- Controlling pod placement using node taints
- Placing pods on specific nodes using node selectors
- Running a custom scheduler
- Evicting pods using the descheduler
- Using Jobs and DaemonSets
- Working with nodes
- Viewing and listing the nodes in your cluster
- Working with nodes
- Managing Nodes
- Managing the maximum number of Pods per Node
- Using the Node Tuning Operator
- Understanding node rebooting
- Freeing node resources using garbage collection
- Allocating resources for nodes
- Allocating specific CPUs for nodes in a cluster
- Machine Config Daemon metrics
- Working with containers
- Using containers
- Using Init Containers to perform tasks before a pod is deployed
- Using volumes to persist container data
- Mapping volumes using projected volumes
- Allowing containers to consume API objects
- Copying files to or from a container
- Executing remote commands in a container
- Using port forwarding to access applications in a container
- Using sysctls in containers
- Working with clusters
- Working with pods
- Logging
- About cluster logging
- Installing cluster logging
- Configuring your cluster logging deployment
- About the Cluster Logging Custom Resource
- Configuring the logging collector
- Configuring the log store
- Configuring the log visualizer
- Configuring cluster logging storage
- Configuring CPU and memory limits for cluster logging components
- Using tolerations to control cluster logging pod placement
- Moving the cluster logging resources with node selectors
- Configuring systemd-journald for cluster logging
- Configuring the log curator
- Maintenance and support
- Viewing logs for a specific resource
- Viewing cluster logs in Kibana
- Forwarding logs to third party systems
- Collecting and storing Kubernetes events
- Updating cluster logging
- Troubleshooting cluster logging
- Uninstalling cluster logging
- Exported fields
- Monitoring
- Metering
- Scalability and performance
- Recommended installation practices
- Recommended host practices
- Recommended cluster scaling practices
- Using the Node Tuning Operator
- Using Cluster Loader
- Using CPU Manager
- Using Topology Manager
- Scaling the Cluster Monitoring Operator
- Planning your environment according to object maximums
- Optimizing storage
- Optimizing routing
- Optimizing networking
- What huge pages do and how they are consumed by apps
- Backup and restore
- Migrating from OpenShift Container Platform 3 to 4
- Migration Toolkit for Containers
- CLI tools
- OpenShift CLI (oc)
- Developer CLI (odo)
- Understanding odo
- odo architecture
- Installing odo
- Using odo in a restricted environment
- Creating a single-component application with odo
- Creating a multicomponent application with odo
- Creating an application with a database
- Using devfiles in odo
- Using sample applications
- Creating instances of services managed by Operators
- Debugging applications in odo
- Managing environment variables in odo
- Configuring the odo CLI
- odo CLI reference
- odo release notes
- Helm CLI
- Knative CLI (kn) for use with OpenShift Serverless
- Pipelines CLI (tkn)
- API reference
- API list
- Common object reference
- Authorization APIs
- About Authorization APIs
- LocalResourceAccessReview [authorization.openshift.io/v1]
- LocalSubjectAccessReview [authorization.openshift.io/v1]
- ResourceAccessReview [authorization.openshift.io/v1]
- SelfSubjectRulesReview [authorization.openshift.io/v1]
- SubjectAccessReview [authorization.openshift.io/v1]
- SubjectRulesReview [authorization.openshift.io/v1]
- TokenReview [authentication.k8s.io/v1]
- LocalSubjectAccessReview [authorization.k8s.io/v1]
- SelfSubjectAccessReview [authorization.k8s.io/v1]
- SelfSubjectRulesReview [authorization.k8s.io/v1]
- SubjectAccessReview [authorization.k8s.io/v1]
- Autoscale APIs
- Config APIs
- About Config APIs
- APIServer [config.openshift.io/v1]
- Authentication [config.openshift.io/v1]
- Build [config.openshift.io/v1]
- ClusterOperator [config.openshift.io/v1]
- ClusterVersion [config.openshift.io/v1]
- Console [config.openshift.io/v1]
- DNS [config.openshift.io/v1]
- FeatureGate [config.openshift.io/v1]
- Image [config.openshift.io/v1]
- Infrastructure [config.openshift.io/v1]
- Ingress [config.openshift.io/v1]
- Network [config.openshift.io/v1]
- OAuth [config.openshift.io/v1]
- OperatorHub [config.openshift.io/v1]
- Project [config.openshift.io/v1]
- Proxy [config.openshift.io/v1]
- Scheduler [config.openshift.io/v1]
- Console APIs
- Extension APIs
- Image APIs
- About Image APIs
- Image [image.openshift.io/v1]
- ImageSignature [image.openshift.io/v1]
- ImageStreamImage [image.openshift.io/v1]
- ImageStreamImport [image.openshift.io/v1]
- ImageStreamMapping [image.openshift.io/v1]
- ImageStream [image.openshift.io/v1]
- ImageStreamTag [image.openshift.io/v1]
- ImageTag [image.openshift.io/v1]
- Machine APIs
- About Machine APIs
- ContainerRuntimeConfig [machineconfiguration.openshift.io/v1]
- ControllerConfig [machineconfiguration.openshift.io/v1]
- KubeletConfig [machineconfiguration.openshift.io/v1]
- MachineConfigPool [machineconfiguration.openshift.io/v1]
- MachineConfig [machineconfiguration.openshift.io/v1]
- MachineHealthCheck [machine.openshift.io/v1beta1]
- Machine [machine.openshift.io/v1beta1]
- MachineSet [machine.openshift.io/v1beta1]
- Metadata APIs
- Monitoring APIs
- Network APIs
- About Network APIs
- ClusterNetwork [network.openshift.io/v1]
- Endpoints [core/v1]
- EndpointSlice [discovery.k8s.io/v1beta1]
- EgressNetworkPolicy [network.openshift.io/v1]
- HostSubnet [network.openshift.io/v1]
- Ingress [networking.k8s.io/v1beta1]
- IngressClass [networking.k8s.io/v1beta1]
- NetNamespace [network.openshift.io/v1]
- NetworkAttachmentDefinition [k8s.cni.cncf.io/v1]
- NetworkPolicy [networking.k8s.io/v1]
- Route [route.openshift.io/v1]
- Service [core/v1]
- Node APIs
- OAuth APIs
- Operator APIs
- About Operator APIs
- Authentication [operator.openshift.io/v1]
- Console [operator.openshift.io/v1]
- Config [operator.openshift.io/v1]
- Config [imageregistry.operator.openshift.io/v1]
- Config [samples.operator.openshift.io/v1]
- CSISnapshotController [operator.openshift.io/v1]
- DNS [operator.openshift.io/v1]
- DNSRecord [ingress.operator.openshift.io/v1]
- Etcd [operator.openshift.io/v1]
- ImageContentSourcePolicy [operator.openshift.io/v1alpha1]
- ImagePruner [imageregistry.operator.openshift.io/v1]
- IngressController [operator.openshift.io/v1]
- KubeAPIServer [operator.openshift.io/v1]
- KubeControllerManager [operator.openshift.io/v1]
- KubeScheduler [operator.openshift.io/v1]
- KubeStorageVersionMigrator [operator.openshift.io/v1]
- Network [operator.openshift.io/v1]
- OpenShiftAPIServer [operator.openshift.io/v1]
- OpenShiftControllerManager [operator.openshift.io/v1]
- ServiceCA [operator.openshift.io/v1]
- OperatorHub APIs
- About OperatorHub APIs
- CatalogSource [operators.coreos.com/v1alpha1]
- ClusterServiceVersion [operators.coreos.com/v1alpha1]
- InstallPlan [operators.coreos.com/v1alpha1]
- OperatorGroup [operators.coreos.com/v1]
- OperatorSource [operators.coreos.com/v1]
- PackageManifest [packages.operators.coreos.com/v1]
- Subscription [operators.coreos.com/v1alpha1]
- Policy APIs
- Project APIs
- RBAC APIs
- Role APIs
- Schedule and quota APIs
- Security APIs
- About Security APIs
- CertificateSigningRequest [certificates.k8s.io/v1beta1]
- CredentialsRequest [cloudcredential.openshift.io/v1]
- PodSecurityPolicyReview [security.openshift.io/v1]
- PodSecurityPolicySelfSubjectReview [security.openshift.io/v1]
- PodSecurityPolicySubjectReview [security.openshift.io/v1]
- RangeAllocation [security.openshift.io/v1]
- Secret [core/v1]
- SecurityContextConstraints [security.openshift.io/v1]
- ServiceAccount [core/v1]
- Storage APIs
- About Storage APIs
- CSIDriver [storage.k8s.io/v1]
- CSINode [storage.k8s.io/v1]
- PersistentVolumeClaim [core/v1]
- StorageClass [storage.k8s.io/v1]
- VolumeAttachment [storage.k8s.io/v1]
- VolumeSnapshot [snapshot.storage.k8s.io/v1beta1]
- VolumeSnapshotClass [snapshot.storage.k8s.io/v1beta1]
- VolumeSnapshotContent [snapshot.storage.k8s.io/v1beta1]
- Template APIs
- User and group APIs
- Workloads APIs
- About Workloads APIs
- BuildConfig [build.openshift.io/v1]
- Build [build.openshift.io/v1]
- CronJob [batch/v1beta1]
- DaemonSet [apps/v1]
- Deployment [apps/v1]
- DeploymentConfig [apps.openshift.io/v1]
- Job [batch/v1]
- Pod [core/v1]
- ReplicationController [core/v1]
- PersistentVolume [core/v1]
- ReplicaSet [apps/v1]
- StatefulSet [apps/v1]
- Service Mesh
- Service Mesh 1.x
- Service Mesh 1.x release notes
- Service Mesh architecture
- Service Mesh and Istio differences
- Preparing to install Service Mesh
- Installing Service Mesh
- Customizing the installation
- Deploying applications on Service Mesh
- Data visualization and observability
- Security
- Traffic management
- Using the 3scale Istio adapter
- Removing Service Mesh
- Service Mesh 1.x
- Jaeger
- OpenShift Virtualization
- About OpenShift Virtualization
- OpenShift Virtualization release notes
- OpenShift Virtualization installation
- Preparing your OpenShift cluster for OpenShift Virtualization
- Installing OpenShift Virtualization using the web console
- Installing OpenShift Virtualization using the CLI
- Installing the virtctl client
- Uninstalling OpenShift Virtualization using the web console
- Uninstalling OpenShift Virtualization using the CLI
- Upgrading OpenShift Virtualization
- Additional security privileges granted for kubevirt-controller and virt-launcher
- Using the CLI tools
- Virtual machines
- Creating virtual machines
- Editing virtual machines
- Editing boot order
- Deleting virtual machines
- Managing virtual machine instances
- Controlling virtual machines states
- Accessing virtual machine consoles
- Managing ConfigMaps, secrets, and service accounts in virtual machines
- Installing VirtIO driver on an existing Windows virtual machine
- Installing VirtIO driver on a new Windows virtual machine
- Advanced virtual machine management
- Importing virtual machines
- Cloning virtual machines
- Virtual machine networking
- Using the default Pod network with OpenShift Virtualization
- Attaching a virtual machine to multiple networks
- Configuring an SR-IOV network device for virtual machines
- Defining an SR-IOV network
- Attaching a virtual machine to an SR-IOV network
- Installing the QEMU guest agent on virtual machines
- Viewing the IP address of NICs on a virtual machine
- Using a MAC address pool for virtual machines
- Virtual machine disks
- Features for storage
- Configuring local storage for virtual machines
- Configuring CDI to work with namespaces that have a compute resource quota
- Uploading local disk images by using the virtctl tool
- Uploading a local disk image to a block storage DataVolume
- Moving a local virtual machine disk to a different node
- Expanding virtual storage by adding blank disk images
- Storage defaults for DataVolumes
- Using container disks with virtual machines
- Preparing CDI scratch space
- Re-using statically provisioned persistent volumes
- Deleting DataVolumes
- Virtual machine templates
- Live migration
- Node maintenance
- Node networking
- Logging, events, and monitoring
- Viewing logs
- Viewing events
- Diagnosing DataVolumes using events and conditions
- Viewing information about virtual machine workloads
- Monitoring virtual machine health
- Viewing cluster information
- OpenShift cluster monitoring, logging, and Telemetry
- Collecting OpenShift Virtualization data for Red Hat Support
- Serverless
×
Recovering from lost master hosts
As of OpenShift Container Platform 4.4, follow the procedure to restore to a previous cluster state in order to recover from lost master hosts.
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If you have a majority of your masters still available and have an etcd quorum, then follow the procedure to replace a single unhealthy etcd member. |