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Chapter 1. Post-installation configuration overview

After installing OpenShift Container Platform, a cluster administrator can configure and customize the following components:

  • Machine
  • Cluster
  • Node
  • Network
  • Storage
  • Users
  • Alerts and notifications

1.1. Configuration tasks to perform after installation
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Cluster administrators can perform the following post-installation configuration tasks:

  • Configure operating system features: Machine Config Operator (MCO) manages MachineConfig objects. By using MCO, you can perform the following tasks on an OpenShift Container Platform cluster:

    • Configure nodes by using MachineConfig objects
    • Configure MCO-related custom resources

  • Configure cluster features: As a cluster administrator, you can modify the configuration resources of the major features of an OpenShift Container Platform cluster. These features include:

    • Image registry
    • Networking configuration
    • Image build behavior
    • Identity provider
    • The etcd configuration
    • Machine set creation to handle the workloads
    • Cloud provider credential management

  • Configure cluster components to be private: By default, the installation program provisions OpenShift Container Platform by using a publicly accessible DNS and endpoints. If you want your cluster to be accessible only from within an internal network, configure the following components to be private:

    • DNS
    • Ingress Controller
    • API server

  • Perform node operations: By default, OpenShift Container Platform uses Red Hat Enterprise Linux CoreOS (RHCOS) compute machines. As a cluster administrator, you can perform the following operations with the machines in your OpenShift Container Platform cluster:

    • Add and remove compute machines
    • Add and remove taints and tolerations to the nodes
    • Configure the maximum number of pods per node
    • Enable Device Manager

  • Configure network: After installing OpenShift Container Platform, you can configure the following:

    • Ingress cluster traffic
    • Node port service range
    • Network policy
    • Enabling the cluster-wide proxy

  • Configure storage: By default, containers operate using ephemeral storage or transient local storage. The ephemeral storage has a lifetime limitation. TO store the data for a long time, you must configure persistent storage. You can configure storage by using one of the following methods:

    • Dynamic provisioning: You can dynamically provision storage on demand by defining and creating storage classes that control different levels of storage, including storage access.
    • Static provisioning: You can use Kubernetes persistent volumes to make existing storage available to a cluster. Static provisioning can support various device configurations and mount options.
  • Configure users: OAuth access tokens allow users to authenticate themselves to the API. As a cluster administrator, you can configure OAuth to perform the following tasks:
  • Specify an identity provider
  • Use role-based access control to define and supply permissions to users
  • Install an Operator from OperatorHub
  • Manage alerts and notifications: By default, firing alerts are displayed on the Alerting UI of the web console. You can also configure OpenShift Container Platform to send alert notifications to external systems.
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