After installing OpenShift Container Platform, a cluster administrator can configure and customize the following components:
Alerts and notifications
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 on an OpenShift Container Platform cluster:
Configure nodes by using
Configure MCO-related custom resources
Configure bare metal nodes: The Bare Metal Operator (BMO) implements a Kubernetes API for managing bare metal hosts. It maintains an inventory of available bare metal hosts as instances of the BareMetalHost Custom Resource Definition (CRD). The Bare Metal Operator can:
Inspect the host’s hardware details and report them on the corresponding BareMetalHost. This includes information about CPUs, RAM, disks, NICs, and more.
Inspect the host’s firmware and configure BIOS settings.
Provision hosts with a desired image.
Clean a host’s disk contents before or after provisioning.
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 build behavior
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 from within an internal network only, configure the following components to be private:
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, as a cluster administrator, you can configure the following:
Ingress cluster traffic
Node port service range
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, so you must configure persistent storage to store the data for a long time. 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: Cluster administrators can use Kubernetes persistent volumes to make existing storage available to a cluster by supporting 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 specify an identity provider, use role-based access control to define and apply permissions to users, and install an Operator from OperatorHub.
Manage alerts and notifications: As a cluster administrator, you can view firing alerts by default from the Alerting UI of the web console. You can also configure OpenShift Container Platform to send alert notifications to external systems so that you learn about important issues with your cluster.