Welcome to the OpenShift Container Platform 4.2 documentation, where you can find information to help you learn about OpenShift Container Platform and start exploring its features.
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As someone setting out to install an OpenShift Container Platform 4.2 cluster, this documentation will help you:
Install a cluster on AWS: You have the most installation options when you deploy a cluster on Amazon Web Services (AWS). You can deploy clusters with default settings or custom AWS settings. You can also deploy a cluster on AWS infrastructure that you provisioned yourself. You can modify the provided AWS CloudFormation templates to meet your needs.
Install a cluster on VMware vSphere: You can install OpenShift Container Platform on supported versions of vSphere.
Install a cluster on bare metal: If none of the available platform and cloud providers meet your needs, you can install OpenShift Container Platform on bare metal.
Install a cluster on Red Hat OpenStack Platform (RHOSP): You can install a cluster on RHOSP with customizations.
Install a cluster in a restricted network: If your cluster that uses user-provisioned infrastructure on AWS, GCP, vSphere, or bare metal does not have full access to the internet, you can mirror the OpenShift Container Platform installation images and install a cluster in a restricted network.
Check installation logs: Access installation logs to evaluate issues that occur during OpenShift Container Platform 4.2 installation.
Access OpenShift Container Platform: Use credentials output at the end of the installation process to log in to the OpenShift Container Platform cluster from the command line or web console.
Ultimately, OpenShift is a platform for developing and deploying containerized applications. As an application developer, OpenShift Container Platform documentation will help you:
Understand OpenShift Container Platform development: Learn the different types of containerized applications, from simple containers to advanced Kubernetes deployments and Operators.
Work with projects: Create projects from the web console or CLI to organize and share the software you develop.
Work with applications: Use the Developer perspective in the OpenShift Container Platform web console to easily create and deploy applications. Use the Topology view to visually interact with your applications, monitor status, connect and group components, and modify your code base.
Use the developer CLI tool (odo): The odo CLI tool lets developers create single or multi-component applications easily and automates deployment, build, and service route configurations. It abstracts complex Kubernetes and OpenShift Container Platform concepts, allowing developers to focus on developing their applications.
Understand Operators: Operators are the preferred method for creating on-cluster applications for OpenShift Container Platform 4.2. Learn about the Operator Framework and how to deploy applications using installed Operators into your projects.
Understand image builds: Choose from different build strategies (Docker, S2I, custom, and pipeline) that can include different kinds of source materials (from places like Git repositories, local binary inputs, and external artifacts). Then, follow examples of build types from basic builds to advanced builds.
Create container images: A container image is the most basic building block in OpenShift (and Kubernetes) applications. Defining imagestreams lets you gather multiple versions of an image in one place as you continue its development. S2I containers let you insert your source code into a base container that is set up to run code of a particular type (such as Ruby, Node.js, or Python).
Create Deployments and DeploymentConfigs: Use Deployments and DeploymentConfigs to exert fine-grained management over applications.
Use the Workloads page or
oc CLI to manage DeploymentConfigs. Learn Rolling, Recreate, and Custom deployment strategies.
Create templates: Use existing templates or create your own templates that describe how an application is built or deployed. A template can combine images with descriptions, parameters, replicas, exposed ports and other content that defines how an application can be run or built.
Create Operators: Operators are the preferred method for creating on-cluster applications for OpenShift Container Platform 4.2. Learn the workflow for building, testing, and deploying Operators. Then create your own Operators based on Ansible or Helm, or configure built-in Prometheus monitoring using the Operator SDK.
Ongoing tasks on your OpenShift Container Platform 4.2 cluster include various activities for managing machines, providing services to users, and following monitoring and logging features that watch over the cluster. As a cluster administrator, this documentation will help you:
Understand OpenShift Container Platform management: Learn about components of the OpenShift Container Platform 4.2 control plane. See how OpenShift masters and workers are managed and updated through the Machine API and Operators.
Manage container registries: Each OpenShift Container Platform cluster includes a built-in container registry for storing its images. You can also configure a separate Red Hat Quay registry to use with OpenShift. The Quay.io site provides a public container registry that stores OpenShift containers and Operators.
Manage users and groups: Add users and groups that have different levels of permissions to use or modify clusters.
Manage authentication: Learn how user, group, and API authentication works in OpenShift Container Platform. OpenShift Container Platform supports multiple identity providers, including HTPasswd, Keystone, LDAP, basic, request header, GitHub, GitLab, Google, and OpenID identity providers.
Manage Ingress, API server, and service certificates: OpenShift Container Platform creates certificates by default for the Ingress Operator, the API server, and for services needed by complex middleware applications that require encryption. At some point, you may need to change, add, and rotate these certificates.
Manage networking: Networking in OpenShift Container Platform is managed by the Cluster Network Operator (CNO). The CNO uses iptables rules in kube-proxy to direct traffic between nodes and pods running on those nodes. The Multis Container Network Interface adds the capability to attach multiple network interfaces to a Pod. Using NetworkPolicy features, you can isolate your networks or permit selected traffic.
Manage storage: OpenShift Container Platform allows cluster administrators to configure persistent storage using Red Hat OpenShift Container Storage, AWS Elastic Block Store, NFS, iSCSI, and Container Storage Interface (CSI). As needed, you can expand persistent volumes and configure dynamic provisioning.
Manage Operators: Lists of Red Hat, ISV, and community Operators can be reviewed by cluster administrators and installed on their clusters. Once installed, you can run, upgrade, back up or otherwise manage the Operator on your cluster (based on what the Operator is designed to do).
Use Custom Resource Definition (CRDs) to modify the cluster: Cluster features that are implemented with Operators, can be modified with CRDs. Learn to create a CRD and manage resources from CRDs.
Prune and reclaim resources: You can reclaim spaceby pruning unneeded Operators, groups, deployments, builds, images, registries, and cron jobs.
Update a cluster: To upgrade your OpenShift Container Platform to a later version, use the Cluster Version Operator (CVO). If an update is available from the Container Platform update service, you apply that cluster update from either the web console or the CLI.
Work with cluster logging: Learn about cluster logging and configure different cluster logging types, such as Elasticsearch, Fluentd, Kibana, and Curator.
Monitor clusters: Learn to configure the monitoring. Once your monitoring is configured, use the Web UI to access Prometheus, Alertmanager, and Grafana. To monitor applications, configure custom metrics for each selected namespace.
Remote health monitoring: OpenShift Container Platform collects anonymized aggregated information about your cluster and reports it to Red Hat via Telemetry and the Insights Operator. This information allows Red Hat to improve OpenShift Container Platform and to react to issues that impact customers more quickly. You can view the data collected by remote health monitoring.