About migrating from OpenShift Container Platform 3 to 4 | Migrating from version 3 to 4

This is a cache of https://docs.openshift.com/container-platform/4.9/migrating_from_ocp_3_to_4/about-migrating-from-3-to-4.html. It is a snapshot of the page at 2024-11-25T19:12:22.536+0000.

About migrating from OpenShift Container Platform 3 to 4 | Migrating from version 3 to 4 | OpenShift Container Platform 4.9

About
- Welcome
- Learn more about OpenShift Container Platform
- About OpenShift Kubernetes Engine
- Kubernetes overview
- Legal notice
Release notes
- OpenShift Container Platform 4.9 release notes
Architecture
- Architecture overview
- Product architecture
- Installation and update
- Red Hat OpenShift Cluster Manager
- Control plane architecture
- Understanding OpenShift development
- Red Hat Enterprise Linux CoreOS
- Admission plugins
Installing
- Installation overview
- Selecting an installation method and preparing a cluster
- Mirroring images for a disconnected installation
- Installing on AWS
  - Preparing to install 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 into a government or secret region
  - Installing a cluster on AWS into a China region
  - 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
  - Preparing to install 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 into a government region
  - Installing a cluster on Azure using ARM templates
  - Uninstalling a cluster on Azure
- Installing on Azure Stack Hub
  - Preparing to install on Azure Stack Hub
  - Configuring an Azure Stack Hub account
  - Manually creating IAM for Azure Stack Hub
  - Installing a cluster on Azure Stack Hub using ARM templates
- Installing on GCP
  - Preparing to install 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 into a shared VPC on GCP using Deployment Manager templates
  - Installing a cluster on GCP in a restricted network with user-provisioned infrastructure
  - Uninstalling a cluster on GCP
- Installing on bare metal
  - Preparing to install on bare metal
  - Installing a user-provisioned cluster on bare metal
  - Installing a user-provisioned bare metal cluster with network customizations
  - Installing a user-provisioned bare metal cluster on a restricted network
- Installing on a single node
  - Preparing to install OpenShift on a single node
  - Installing OpenShift on a single node
- Deploying installer-provisioned clusters on bare metal
  - Overview
  - Prerequisites
  - Setting up the environment for an OpenShift installation
  - Post-installation configuration
  - Expanding the cluster
  - Troubleshooting
- Deploying installer-provisioned clusters on IBM Cloud
  - Prerequisites
  - Installation workflow
- Installing with z/VM on IBM Z and LinuxONE
  - Preparing to install with z/VM on IBM Z and LinuxONE
  - Installing a cluster with z/VM on IBM Z and LinuxONE
  - Restricted network IBM Z installation with z/VM
- Installing with RHEL KVM on IBM Z and LinuxONE
  - Preparing to install with RHEL KVM on IBM Z and LinuxONE
  - Installing a cluster with RHEL KVM on IBM Z and LinuxONE
  - Restricted network IBM Z installation with RHEL KVM
- Installing on IBM Power
  - Preparing to install on IBM Power
  - Installing a cluster on IBM Power
  - Restricted network IBM Power installation
- Installing on OpenStack
  - Preparing to install on OpenStack
  - Installing a cluster on OpenStack with customizations
  - Installing a cluster on OpenStack with Kuryr
  - Installing a cluster that supports SR-IOV compute machines on OpenStack
  - 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 on your own SR-IOV infrastructure
  - Installing a cluster on OpenStack in a restricted network
  - OpenStack cloud configuration reference guide
  - Uninstalling a cluster on OpenStack
  - Uninstalling a cluster on OpenStack from your own infrastructure
- Installing on RHV
  - Preparing to install on RHV
  - Installing a cluster quickly on RHV
  - Installing a cluster on RHV with customizations
  - Installing a cluster on RHV with user-provisioned infrastructure
  - Installing a cluster on RHV in a restricted network
  - Uninstalling a cluster on RHV
- Installing on vSphere
  - Preparing to install 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
  - Using the vSphere Problem Detector Operator
- Installing on VMC
  - Preparing to install on VMC
  - Installing a cluster on VMC
  - Installing a cluster on VMC with customizations
  - Installing a cluster on VMC with network customizations
  - Installing a cluster on VMC in a restricted network
  - Installing a cluster on VMC with user-provisioned infrastructure
  - Installing a cluster on VMC with user-provisioned infrastructure and network customizations
  - Installing a cluster on VMC in a restricted network with user-provisioned infrastructure
  - Uninstalling a cluster on VMC
- Installing on any platform
  - Installing a cluster on any platform
- Installation configuration
  - Customizing nodes
  - Configuring your firewall
- Validating an installation
- Troubleshooting installation issues
- Support for FIPS cryptography
Post-installation configuration
- Post-installation configuration overview
- Configuring a private cluster
- Machine configuration tasks
- Cluster tasks
- Node tasks
- Network configuration
- Storage configuration
- Preparing for users
- Configuring alert notifications
- Converting a connected cluster to a disconnected cluster
- Configuring additional devices in an IBM Z or LinuxONE environment
Updating clusters
- Updating clusters overview
- Understanding OpenShift updates
- Understanding upgrade channels
- Preparing to update to OpenShift Container Platform 4.9
- Preparing to perform an EUS-to-EUS update
- Updating a cluster using the web console
- Updating a cluster using the CLI
- Performing update using canary rollout strategy
- Updating a cluster that includes RHEL compute machines
- Updating a cluster in a disconnected environment
- Updating hardware on nodes running on vSphere
Support
- Support overview
- Managing your cluster resources
- Getting support
- Remote health monitoring with connected clusters
- Gathering data about your cluster
- Summarizing cluster specifications
- Troubleshooting
Web console
- Web console overview
- Accessing the web console
- Viewing cluster information
- Adding user preferences
- Configuring the web console
- Customizing the web console
- Web terminal
- Disabling the web console
- Creating quick start tutorials
CLI tools
- CLI tools overview
- OpenShift CLI (oc)
- Developer CLI (odo)
- Knative CLI (kn) for use with OpenShift Serverless
- Pipelines CLI (tkn)
- opm CLI
  - Installing the opm CLI
  - opm CLI reference
- Operator SDK
  - Installing the Operator SDK CLI
  - Operator SDK CLI reference
Security and compliance
- Security and compliance overview
- Container security
- Configuring certificates
- Certificate types and descriptions
- Compliance Operator
- File Integrity Operator
- Viewing audit logs
- Configuring the audit log policy
- Configuring TLS security profiles
- Configuring seccomp profiles
- Allowing JavaScript-based access to the API server from additional hosts
- Encrypting etcd data
- Scanning pods for vulnerabilities
- Network-Bound Disk Encryption (NBDE)
Authentication and authorization
- Authentication and authorization overview
- Understanding authentication
- Configuring the internal OAuth server
- Configuring OAuth clients
- Managing user-owned OAuth access tokens
- Understanding identity provider configuration
- Configuring identity providers
- 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
- Managing cloud provider credentials
Networking
- Understanding networking
- Accessing hosts
- Networking Operators overview
- Understanding the Cluster Network Operator
- Understanding the DNS Operator
- Understanding the Ingress Operator
- Verifying connectivity to an endpoint
- Configuring the node port service range
- Configuring IP failover
- Using SCTP
- Using PTP hardware
- Network policy
  - About network policy
  - Logging network policy
  - Creating a network policy
  - Viewing a network policy
  - Editing a network policy
  - Deleting a network policy
  - Defining a default network policy for projects
  - Configuring multitenant network policy
- Multiple networks
  - Understanding multiple networks
  - Configuring an additional network
  - About virtual routing and forwarding
  - Configuring multi-network policy
  - Attaching a pod to an additional network
  - Removing a pod from an additional network
  - Editing an additional network
  - Removing an additional network
  - Assigning a secondary network to a VRF
- Hardware networks
  - About Single Root I/O Virtualization (SR-IOV) hardware networks
  - Installing the SR-IOV Operator
  - Configuring the SR-IOV Operator
  - Configuring an SR-IOV network device
  - Configuring an SR-IOV Ethernet network attachment
  - Configuring an SR-IOV InfiniBand network attachment
  - Adding a pod to an SR-IOV network
  - Using high performance multicast
  - Using DPDK and RDMA
  - Uninstalling the SR-IOV Operator
- 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
  - Viewing 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
  - About the OVN-Kubernetes network provider
  - Migrating from the OpenShift SDN cluster network provider
  - Rolling back to the OpenShift SDN cluster network provider
  - Converting to IPv4/IPv6 dual stack networking
  - IPsec encryption configuration
  - Configuring an egress firewall for a project
  - Viewing an egress firewall for a project
  - Editing an egress firewall for a project
  - Removing an egress firewall from a project
  - Configuring an egress IP address
  - Assigning an egress IP address
  - Considerations for the use of an egress router pod
  - Deploying an egress router pod in redirect mode
  - Enabling multicast for a project
  - Disabling multicast for a project
  - Tracking network flows
  - Configuring hybrid networking
- Configuring Routes
  - Route configuration
  - Secured routes
- Configuring ingress cluster traffic
  - Overview
  - Configuring ExternalIPs for services
  - Configuring ingress cluster traffic using an Ingress Controller
  - Configuring ingress cluster traffic using a load balancer
  - Configuring ingress cluster traffic on AWS using a Network Load Balancer
  - Configuring ingress cluster traffic using a service external IP
  - Configuring ingress cluster traffic using a NodePort
- Kubernetes NMState
  - About the Kubernetes NMState Operator
  - Observing node network state
  - Updating node network configuration
  - Troubleshooting node network configuration
- Configuring the cluster-wide proxy
- Configuring a custom PKI
- Load balancing on OpenStack
- Load balancing with MetalLB
  - About MetalLB and the MetalLB Operator
  - Installing the MetalLB Operator
  - Configuring MetalLB address pools
  - Configuring services to use MetalLB
- Associating secondary interfaces metrics to network attachments
Storage
- Storage overview
- Understanding ephemeral storage
- Understanding persistent storage
- Configuring persistent storage
- Using Container Storage Interface (CSI)
- Expanding persistent volumes
- Dynamic provisioning
Registry
- Registry overview
- Image Registry Operator in OpenShift Container Platform
- Setting up and configuring the registry
- Accessing the registry
- Exposing the registry
Operators
- Operators overview
- Understanding Operators
- User tasks
  - Creating applications from installed Operators
  - Installing Operators in your namespace
- Administrator tasks
- Developing Operators
- Cluster Operators reference
CI/CD
- CI/CD overview
- Builds
- Migrating from Jenkins to Tekton
  - Migrating from Jenkins to Tekton
- Pipelines
- GitOps
Images
- Overview of images
- Configuring the Cluster Samples Operator
- Using the Cluster Samples Operator with an alternate registry
- 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
Building applications
- Building applications overview
- Projects
- Creating applications
- Viewing application composition using the Topology view
- Connecting applications to services
- Working with Helm charts
- Deployments
- Quotas
  - Resource quotas per project
  - Resource quotas across multiple projects
- Using config maps with applications
- Monitoring project and application metrics using the Developer perspective
- Monitoring application health
- Editing applications
- Pruning objects to reclaim resources
- Idling applications
- Deleting applications
- Using the Red Hat Marketplace
Machine management
- Overview of machine management
- Managing compute machines with the Machine API
- Manually scaling a machine set
- Modifying a machine set
- Deleting a machine
- Applying autoscaling to a cluster
- Creating infrastructure machine sets
- Adding a RHEL compute machine
- Adding more RHEL compute machines
- Managing user-provisioned infrastructure manually
- Deploying machine health checks
Nodes
- Overview of nodes
- Working with pods
- Controlling pod placement onto nodes (scheduling)
- Using Jobs and DaemonSets
  - Running background tasks on nodes automatically with daemonsets
  - Running tasks in pods using jobs
- Working with nodes
- Working with containers
- Working with clusters
- Remote worker nodes on the network edge
  - Using remote worker node at the network edge
Windows Container Support for OpenShift
- Red Hat OpenShift support for Windows Containers overview
- Red Hat OpenShift support for Windows Containers release notes
- Understanding Windows container workloads
- Enabling Windows container workloads
- Creating Windows MachineSet objects
- Scheduling Windows container workloads
- Windows node upgrades
- Using Bring-Your-Own-Host Windows instances as nodes
- Removing Windows nodes
- Disabling Windows container workloads
Sandboxed Containers Support for OpenShift
- OpenShift sandboxed containers release notes
- Understanding OpenShift sandboxed containers
- Deploying OpenShift sandboxed containers workloads
- Uninstalling OpenShift sandboxed containers workloads
- upgrade OpenShift sandboxed containers
- Collecting OpenShift sandboxed containers data for Red Hat Support
Logging
- Release notes
- About Logging
- Installing Logging
- Configuring your Logging deployment
- Viewing logs for a specific resource
- Viewing cluster logs in Kibana
- Forwarding logs to third party systems
- Enabling JSON logging
- Collecting and storing Kubernetes events
- Updating Logging
- Viewing cluster dashboards
- Troubleshooting Logging
- Uninstalling Logging
- Exported fields
Monitoring
- Monitoring overview
- Configuring the monitoring stack
- Enabling monitoring for user-defined projects
- Managing metrics
- Managing alerts
- Reviewing monitoring dashboards
- Accessing third-party UIs
- Troubleshooting monitoring issues
Scalability and performance
- Recommended host practices
- Recommended host practices for IBM Z & LinuxONE environments
- Recommended cluster scaling practices
- Using the Node Tuning Operator
- Using Cluster Loader
- Using CPU Manager and Topology Manager
- Scaling the Cluster Monitoring Operator
- Planning your environment according to object maximums
- Optimizing storage
- Optimizing routing
- Optimizing networking
- Managing bare metal hosts
- What huge pages do and how they are consumed by apps
- Performance Addon Operator for low latency nodes
- Performing latency tests for platform verification
- Creating a performance profile
- Deploying distributed units manually on single-node OpenShift
- Workload partitioning on single-node OpenShift
- Deploying distributed units at scale in a disconnected environment
Specialized hardware and driver enablement
- About specialized hardware and driver enablement
- Driver Toolkit
- Special Resource Operator
- Node Feature Discovery Operator
Backup and restore
- Overview of backup and restore operations
- Shutting down a cluster gracefully
- Restarting a cluster gracefully
- Application backup and restore
- Control plane backup and restore
Migrating from version 3 to 4
- Migrating from version 3 to 4 overview
- About migrating from OpenShift Container Platform 3 to 4
- Differences between OpenShift Container Platform 3 and 4
- Network considerations
- About MTC
- Installing MTC
- Installing MTC in a restricted network environment
- Upgrading MTC
- Premigration checklists
- Migrating your applications
- Advanced migration options
- Troubleshooting
Migration Toolkit for Containers
- About MTC
- MTC release notes
- Installing MTC
- Installing MTC in a restricted network environment
- Upgrading MTC
- Premigration checklists
- Network considerations
- Migrating your applications
- Advanced migration options
- Troubleshooting
API reference
- Understanding API tiers
- API compatibility guidelines
- Editing kubelet log level verbosity and gathering logs
- API list
- Common object reference
  - Index
- 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
  - About Autoscale APIs
  - ClusterAutoscaler [autoscaling.openshift.io/v1]
  - MachineAutoscaler [autoscaling.openshift.io/v1beta1]
  - HorizontalPodAutoscaler [autoscaling/v1]
- 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]
  - HelmChartRepository [helm.openshift.io/v1beta1]
  - 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
  - About Console APIs
  - ConsoleCLIDownload [console.openshift.io/v1]
  - ConsoleExternalLogLink [console.openshift.io/v1]
  - ConsoleLink [console.openshift.io/v1]
  - ConsoleNotification [console.openshift.io/v1]
  - ConsolePlugin [console.openshift.io/v1alpha1]
  - ConsoleQuickStart [console.openshift.io/v1]
  - ConsoleYAMLSample [console.openshift.io/v1]
- Extension APIs
  - About Extension APIs
  - APIService [apiregistration.k8s.io/v1]
  - CustomResourceDefinition [apiextensions.k8s.io/v1]
  - MutatingWebhookConfiguration [admissionregistration.k8s.io/v1]
  - ValidatingWebhookConfiguration [admissionregistration.k8s.io/v1]
- 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
  - About Metadata APIs
  - APIRequestCount [apiserver.openshift.io/v1]
  - Binding [core/v1]
  - ComponentStatus [core/v1]
  - ConfigMap [core/v1]
  - ControllerRevision [apps/v1]
  - Event [events.k8s.io/v1]
  - Event [core/v1]
  - Lease [coordination.k8s.io/v1]
  - Namespace [core/v1]
- Monitoring APIs
  - About Monitoring APIs
  - Alertmanager [monitoring.coreos.com/v1]
  - AlertmanagerConfig [monitoring.coreos.com/v1alpha1]
  - PodMonitor [monitoring.coreos.com/v1]
  - Probe [monitoring.coreos.com/v1]
  - Prometheus [monitoring.coreos.com/v1]
  - PrometheusRule [monitoring.coreos.com/v1]
  - ServiceMonitor [monitoring.coreos.com/v1]
  - ThanosRuler [monitoring.coreos.com/v1]
- Network APIs
  - About Network APIs
  - ClusterNetwork [network.openshift.io/v1]
  - Endpoints [core/v1]
  - EndpointSlice [discovery.k8s.io/v1]
  - EgressNetworkPolicy [network.openshift.io/v1]
  - EgressRouter [network.operator.openshift.io/v1]
  - HostSubnet [network.openshift.io/v1]
  - Ingress [networking.k8s.io/v1]
  - IngressClass [networking.k8s.io/v1]
  - IPPool [whereabouts.cni.cncf.io/v1alpha1]
  - NetNamespace [network.openshift.io/v1]
  - NetworkAttachmentDefinition [k8s.cni.cncf.io/v1]
  - NetworkPolicy [networking.k8s.io/v1]
  - PodNetworkConnectivityCheck [controlplane.operator.openshift.io/v1alpha1]
  - Route [route.openshift.io/v1]
  - Service [core/v1]
- Node APIs
  - About Node APIs
  - Node [core/v1]
  - Profile [tuned.openshift.io/v1]
  - RuntimeClass [node.k8s.io/v1]
  - Tuned [tuned.openshift.io/v1]
- OAuth APIs
  - About OAuth APIs
  - OAuthAccessToken [oauth.openshift.io/v1]
  - OAuthAuthorizeToken [oauth.openshift.io/v1]
  - OAuthClientAuthorization [oauth.openshift.io/v1]
  - OAuthClient [oauth.openshift.io/v1]
  - UserOAuthAccessToken [oauth.openshift.io/v1]
- Operator APIs
  - About Operator APIs
  - Authentication [operator.openshift.io/v1]
  - CloudCredential [operator.openshift.io/v1]
  - ClusterCSIDriver [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]
  - OperatorPKI [network.operator.openshift.io/v1]
  - ServiceCA [operator.openshift.io/v1]
  - Storage [operator.openshift.io/v1]
- OperatorHub APIs
  - About OperatorHub APIs
  - CatalogSource [operators.coreos.com/v1alpha1]
  - ClusterServiceVersion [operators.coreos.com/v1alpha1]
  - InstallPlan [operators.coreos.com/v1alpha1]
  - Operator [operators.coreos.com/v1]
  - OperatorCondition [operators.coreos.com/v2]
  - OperatorGroup [operators.coreos.com/v1]
  - PackageManifest [packages.operators.coreos.com/v1]
  - Subscription [operators.coreos.com/v1alpha1]
- Policy APIs
  - About Policy APIs
  - PodDisruptionBudget [policy/v1]
- Project APIs
  - About Project APIs
  - Project [project.openshift.io/v1]
  - ProjectRequest [project.openshift.io/v1]
- Provisioning APIs
  - About Provisioning APIs
  - BareMetalHost [metal3.io/v1alpha1]
  - Provisioning [metal3.io/v1alpha1]
- RBAC APIs
  - About RBAC APIs
  - ClusterRoleBinding [rbac.authorization.k8s.io/v1]
  - ClusterRole [rbac.authorization.k8s.io/v1]
  - RoleBinding [rbac.authorization.k8s.io/v1]
  - Role [rbac.authorization.k8s.io/v1]
- Role APIs
  - About Role APIs
  - ClusterRoleBinding [authorization.openshift.io/v1]
  - ClusterRole [authorization.openshift.io/v1]
  - RoleBindingRestriction [authorization.openshift.io/v1]
  - RoleBinding [authorization.openshift.io/v1]
  - Role [authorization.openshift.io/v1]
- Schedule and quota APIs
  - About Schedule and quota APIs
  - AppliedClusterResourceQuota [quota.openshift.io/v1]
  - ClusterResourceQuota [quota.openshift.io/v1]
  - FlowSchema [flowcontrol.apiserver.k8s.io/v1beta1]
  - LimitRange [core/v1]
  - PriorityClass [scheduling.k8s.io/v1]
  - PriorityLevelConfiguration [flowcontrol.apiserver.k8s.io/v1beta1]
  - ResourceQuota [core/v1]
- Security APIs
  - About Security APIs
  - CertificateSigningRequest [certificates.k8s.io/v1]
  - 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]
  - CSIStorageCapacity [storage.k8s.io/v1beta1]
  - PersistentVolumeClaim [core/v1]
  - StorageClass [storage.k8s.io/v1]
  - StorageState [migration.k8s.io/v1alpha1]
  - StorageVersionMigration [migration.k8s.io/v1alpha1]
  - VolumeAttachment [storage.k8s.io/v1]
  - VolumeSnapshot [snapshot.storage.k8s.io/v1]
  - VolumeSnapshotClass [snapshot.storage.k8s.io/v1]
  - VolumeSnapshotContent [snapshot.storage.k8s.io/v1]
- Template APIs
  - About Template APIs
  - BrokerTemplateInstance [template.openshift.io/v1]
  - PodTemplate [core/v1]
  - Template [template.openshift.io/v1]
  - TemplateInstance [template.openshift.io/v1]
- User and group APIs
  - About User and group APIs
  - Group [user.openshift.io/v1]
  - Identity [user.openshift.io/v1]
  - UserIdentityMapping [user.openshift.io/v1]
  - User [user.openshift.io/v1]
- Workloads APIs
  - About Workloads APIs
  - BuildConfig [build.openshift.io/v1]
  - Build [build.openshift.io/v1]
  - CronJob [batch/v1]
  - 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 2.x
- Service Mesh 1.x
Distributed tracing
- Distributed tracing release notes
- Distributed tracing architecture
  - Distributed tracing architecture
- Distributed tracing installation
Virtualization
- About OpenShift Virtualization
- Start here with OpenShift Virtualization
- OpenShift Virtualization release notes
- Installing
- Upgrading OpenShift Virtualization
- Additional security privileges granted for kubevirt-controller and virt-launcher
- Using the CLI tools
- Virtual machines
- Virtual machine templates
- Live migration
- Node maintenance
- Node networking
- Logging, events, and monitoring
Serverless
- Release notes
- About Serverless
- Installing Serverless
- Serving
- Eventing
- Functions
- Knative CLI
- Observability
- Integrations
- Removing Serverless
- Serverless support

OpenShift Container Platform 4 contains new technologies and functionality that result in a cluster that is self-managing, flexible, and automated. OpenShift Container Platform 4 clusters are deployed and managed very differently from OpenShift Container Platform 3.

The most effective way to migrate from OpenShift Container Platform 3 to 4 is by using a CI/CD pipeline to automate deployments in an application lifecycle management framework.

If you do not have a CI/CD pipeline or if you are migrating stateful applications, you can use the Migration Toolkit for Containers (MTC) to migrate your application workloads.

To successfully transition to OpenShift Container Platform 4, review the following information:

Differences between OpenShift Container Platform 3 and 4

Architecture
Installation and upgrade
Storage, network, logging, security, and monitoring considerations

About the Migration Toolkit for Containers

Workflow
File system and snapshot copy methods for persistent volumes (PVs)
Direct volume migration
Direct image migration

Advanced migration options

Automating your migration with migration hooks
Using the MTC API
Excluding resources from a migration plan
Configuring the MigrationController custom resource for large-scale migrations
Enabling automatic PV resizing for direct volume migration
Enabling cached Kubernetes clients for improved performance

For new features and enhancements, technical changes, and known issues, see the MTC release notes.