- Documentation
- OpenShift Container Platform
- Migration
- Migrating from OpenShift Container Platform 3
- About migrating from OpenShift Container Platform 3 to 4 history
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- About
- Release notes
- Architecture
- Installing
- 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 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
- 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 into an existing VPC
- Installing a private cluster on GCP
- Installing a cluster on GCP using Deployment Manager templates
- Restricted network GCP installation
- Uninstalling a cluster on GCP
- Installing on bare metal
- Installing on IBM Z and LinuxONE
- Installing on IBM Power
- Installing on OpenStack
- Installing on vSphere
- Gathering installation logs
- Support for FIPS cryptography
- Installation configuration
- Installing on AWS
- Updating clusters
- Support
- Web console
- Authentication
- Understanding authentication
- Certificate types and descriptions
- 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
- Configuring certificates
- Using RBAC to define and apply permissions
- Removing the kubeadmin user
- Configuring the user agent
- Understanding and creating service accounts
- Using service accounts in applications
- Using a service account as an OAuth client
- Scoping tokens
- Managing Security Context Constraints
- Impersonating the system:admin user
- Syncing LDAP groups
- Allowing JavaScript-based access to the API server from additional hosts
- Encrypting etcd data
- Networking
- Understanding networking
- Accessing hosts
- Understanding the Cluster Network Operator (CNO)
- Understanding the DNS Operator
- Understanding the Ingress Operator
- 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 macvlan network
- Configuring an ipvlan network
- Configuring a host-device network
- Editing an additional network
- Removing an additional network
- Configuring PTP
- Hardware networks
- OpenShift SDN default CNI network provider
- Configuring Routes
- Configuring ingress cluster traffic
- Configuring the cluster-wide proxy
- Configuring a custom PKI
- Storage
- Understanding ephemeral storage
- Understanding persistent storage
- Configuring persistent storage
- Persistent storage using Amazon EFS
- Persistent storage using AWS Elastic Block Store
- Persistent storage using Azure Disk
- Persistent storage using Azure File
- Persistent storage using Cinder
- Persistent storage using Container Storage Interface (CSI)
- 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
- Expanding persistent volumes
- Dynamic provisioning
- Registry
- Operators
- Understanding Operators
- Understanding the Operator Lifecycle Manager (OLM)
- Understanding the OperatorHub
- Adding Operators to a cluster
- Configuring proxy support
- Deleting Operators from a cluster
- Creating applications from installed Operators
- Viewing Operator status
- Creating policy for Operator installations and upgrades
- Using OLM on restricted networks
- CRDs
- Operator SDK
- 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
- Creating and using ConfigMaps
- Images
- Applications
- Machine management
- Nodes
- Working with pods
- 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
- 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
- Viewing node audit logs
- 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
- Logging
- About cluster logging
- About deploying cluster logging
- Deploying cluster logging
- Updating cluster logging
- Viewing cluster logs
- Viewing cluster logs using Kibana
- Configuring your cluster logging deployment
- About configuring cluster logging
- Changing cluster logging management state
- Configuring cluster logging
- Configuring Elasticsearch
- Configuring Kibana
- Configuring Curator
- Configuring the logging collector
- Collecting and storing Kubernetes events
- Using tolerations to control cluster logging pod placement
- Forward logs to third party systems
- Configuring systemd-journald for cluster logging
- Viewing Elasticsearch status
- Viewing cluster logging status
- Moving the cluster logging resources with node selectors
- Manually rolling out Elasticsearch
- Troubleshooting Kibana
- Exported fields
- Uninstalling cluster logging
- 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
- What huge pages do and how they are consumed by apps
- Backup and restore
- Migration
- Migrating from OpenShift Container Platform 3
- About migrating from OpenShift Container Platform 3 to 4
- Planning your migration from OpenShift Container Platform 3 to 4
- Migration tools and prerequisites
- Deploying the Cluster Application Migration tool
- Configuring a replication repository
- Migrating applications with the CAM web console
- Migrating control plane settings with the Control Plane Migration Assistant
- Troubleshooting
- Migrating from OpenShift Container Platform 4.1
- Migrating from OpenShift Container Platform 4.2 and later
- Migrating from OpenShift Container Platform 3
- CLI tools
- OpenShift CLI (oc)
- OpenShift Do 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 sample applications
- 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
- OpenShift REST APIs
- 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
- Service Mesh 1.x
- Jaeger
- Container-native virtualization
- About container-native virtualization
- Container-native virtualization release notes
- Container-native virtualization installation
- Upgrading container-native virtualization
- Using the CLI tools
- Virtual machines
- Creating virtual machines
- Editing virtual machines
- Deleting virtual machines
- Controlling virtual machines states
- Accessing virtual machine consoles
- 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
- Virtual machine disks
- Configuring local storage for virtual machines
- 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
- Preparing CDI scratch space
- Virtual machine templates
- Live migration
- Node maintenance
- Logging, events, and monitoring
- Serverless applications
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About migrating OpenShift Container Platform 3 to 4
OpenShift Container Platform 4 includes new technologies and functionality that results in a cluster that is self-managing, flexible, and automated. The way that OpenShift Container Platform 4 clusters are deployed and managed drastically differs from OpenShift Container Platform 3.
To successfully transition from OpenShift Container Platform 3 to OpenShift Container Platform 4, it is important that you review the following information:
- Planning your transition
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Learn about the differences between OpenShift Container Platform versions 3 and 4. Prior to transitioning, be sure that you have reviewed and prepared for storage, networking, logging, security, and monitoring considerations.
- Performing your migration
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Learn about and use the tools to perform your migration:
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Cluster Application Migration (CAM) tool to migrate your application workloads
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Control Plane Migration Assistant (CPMA) to migrate your control plane
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