Chapter 5. Administrator CLI commands

5.1. Cluster management CLI commands

5.1.1. must-gather

Bulk collect data about the current state of your cluster to debug issues.

Example: Gather debugging information

$ oc adm must-gather

5.1.2. top

Show usage statistics of resources on the server.

Example: Show CPU and memory usage for Pods

$ oc adm top pods

Example: Show usage statistics for images

$ oc adm top images

5.2. Node management CLI commands

5.2.1. cordon

Mark a node as unschedulable. Manually marking a node as unschedulable blocks any new pods from being scheduled on the node, but does not affect existing pods on the node.

Example: Mark node1 as unschedulable

$ oc adm cordon node1

5.2.2. drain

Drain a node in preparation for maintenance.

Example: Drain node1

$ oc adm drain node1

5.2.3. node-logs

Display and filter node logs.

Example: Get logs for NetworkManager

$ oc adm node-logs --role master -u NetworkManager.service

5.2.4. taint

Update the taints on one or more nodes.

Example: Add a taint to dedicate a node for a set of users

$ oc adm taint nodes node1 dedicated=groupName:NoSchedule

Example: Remove the taints with key dedicated from node node1

$ oc adm taint nodes node1 dedicated-

5.2.5. uncordon

Mark a node as schedulable.

Example: Mark node1 as schedulable

$ oc adm uncordon node1

5.3. Security and policy CLI commands

5.3.1. certificate

Approve or reject certificate signing requests (CSRs).

Example: Approve a CSR

$ oc adm certificate approve csr-sqgzp

5.3.2. groups

Manage groups in your cluster.

Example: Create a new group

$ oc adm groups new my-group

5.3.3. new-project

Create a new project and specify administrative options.

Example: Create a new project using a node selector

$ oc adm new-project myproject --node-selector='type=user-node,region=east'

5.3.4. pod-network

Manage Pod networks in the cluster.

Example: Isolate project1 and project2 from other non-global projects

$ oc adm pod-network isolate-projects project1 project2

5.3.5. policy

Manage roles and policies on the cluster.

Example: Add the edit role to user1 for all projects

$ oc adm policy add-cluster-role-to-user edit user1

Example: Add the privileged security context constraint to a service account

$ oc adm policy add-scc-to-user privileged -z myserviceaccount

5.4. Maintenance CLI commands

5.4.1. migrate

Migrate resources on the cluster to a new version or format depending on the subcommand used.

Example: Perform an update of all stored objects

$ oc adm migrate storage

Example: Perform an update of only Pods

$ oc adm migrate storage --include=pods

5.4.2. prune

Remove older versions of resources from the server.

Example: Prune older builds including those whose BuildConfigs no longer exist

$ oc adm prune builds --orphans

5.5. Configuration CLI commands

5.5.1. create-api-client-config

Create a client configuration for connecting to the server. This creates a folder containing a client certificate, a client key, a server certificate authority, and a kubeconfig file for connecting to the master as the provided user.

Example: Generate a client certificate for a proxy

$ oc adm create-api-client-config \
  --certificate-authority='/etc/origin/master/proxyca.crt' \
  --client-dir='/etc/origin/master/proxy' \
  --signer-cert='/etc/origin/master/proxyca.crt' \
  --signer-key='/etc/origin/master/proxyca.key' \
  --signer-serial='/etc/origin/master/proxyca.serial.txt' \
  --user='system:proxy'

5.5.2. create-bootstrap-policy-file

Create the default bootstrap policy.

Example: Create a file called policy.json with the default bootstrap policy

$ oc adm create-bootstrap-policy-file --filename=policy.json

5.5.3. create-bootstrap-project-template

Create a bootstrap project template.

Example: Output a bootstrap project template in YAML format to stdout

$ oc adm create-bootstrap-project-template -o yaml

5.5.4. create-error-template

Create a template for customizing the error page.

Example: Output a template for the error page to stdout

$ oc adm create-error-template

5.5.5. create-kubeconfig

Creates a basic .kubeconfig file from client certificates.

Example: Create a .kubeconfig file with the provided client certificates

$ oc adm create-kubeconfig \
  --client-certificate=/path/to/client.crt \
  --client-key=/path/to/client.key \
  --certificate-authority=/path/to/ca.crt

5.5.7. create-provider-selection-template

Create a template for customizing the provider selection page.

Example: Output a template for the provider selection page to stdout

$ oc adm create-provider-selection-template

5.6. Other Administrator CLI commands

5.6.1. build-chain

Output the inputs and dependencies of any builds.

Example: Output dependencies for the perl imagestream

$ oc adm build-chain perl

5.6.2. completion

Output shell completion code for the oc adm commands for the specified shell.

Example: Display oc adm completion code for Bash

$ oc adm completion bash

5.6.3. config

Manage the client configuration files. This command has the same behavior as the oc config command.

Example: Display the current configuration

$ oc adm config view

Example: Switch to a different context

$ oc adm config use-context test-context

5.6.4. release

Manage various aspects of the OpenShift Container Platform release process, such as viewing information about a release or inspecting the contents of a release.

Example: Generate a changelog between two releases and save to changelog.md

$ oc adm release info --changelog=/tmp/git \
    quay.io/openshift-release-dev/ocp-release:4.1.0-rc.7 \
    quay.io/openshift-release-dev/ocp-release:4.1.0 \
    > changelog.md

5.6.5. verify-image-signature

Verify the image signature of an image imported to the internal registry using the local public GPG key.

Example: Verify the nodejs image signature

$ oc adm verify-image-signature \
    sha256:2bba968aedb7dd2aafe5fa8c7453f5ac36a0b9639f1bf5b03f95de325238b288 \
    --expected-identity 172.30.1.1:5000/openshift/nodejs:latest \
    --public-key /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release \
    --save

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