Getting started with the OpenShift CLI - OpenShift CLI (oc) | CLI tools

About the OpenShift CLI

With the OpenShift command-line interface (CLI), the oc command, you can create applications and manage OpenShift Container Platform projects from a terminal. The OpenShift CLI is ideal in the following situations:

Working directly with project source code
Scripting OpenShift Container Platform operations
Managing projects while restricted by bandwidth resources and the web console is unavailable

Installing the OpenShift CLI

You can install the OpenShift CLI (oc) either by downloading the binary or by using an RPM.

Installing the OpenShift CLI by downloading the binary

You can install the OpenShift CLI (oc) in order to interact with OpenShift Container Platform from a command-line interface. You can install oc on Linux, Windows, or macOS.

If you installed an earlier version of oc, you cannot use it to complete all of the commands in OpenShift Container Platform 4.6. Download and install the new version of oc.

Installing the OpenShift CLI on Linux

You can install the OpenShift CLI (oc) binary on Linux by using the following procedure.

Procedure

Navigate to the OpenShift Container Platform downloads page on the Red Hat Customer Portal.
Select the appropriate version in the Version drop-down menu.
Click Download Now next to the OpenShift v4.6 Linux Client entry and save the file.
Unpack the archive:
```
$ tar xvzf <file>
```
Place the oc binary in a directory that is on your PATH.

To check your PATH, execute the following command:
```
$ echo $PATH
```

After you install the OpenShift CLI, it is available using the oc command:

$ oc <command>

Installing the OpenShift CLI on Windows

You can install the OpenShift CLI (oc) binary on Windows by using the following procedure.

Procedure

Navigate to the OpenShift Container Platform downloads page on the Red Hat Customer Portal.
Select the appropriate version in the Version drop-down menu.
Click Download Now next to the OpenShift v4.6 Windows Client entry and save the file.
Unzip the archive with a ZIP program.
Move the oc binary to a directory that is on your PATH.

To check your PATH, open the command prompt and execute the following command:
```
C:\> path
```

After you install the OpenShift CLI, it is available using the oc command:

C:\> oc <command>

Installing the OpenShift CLI on macOS

You can install the OpenShift CLI (oc) binary on macOS by using the following procedure.

Procedure

Navigate to the OpenShift Container Platform downloads page on the Red Hat Customer Portal.
Select the appropriate version in the Version drop-down menu.
Click Download Now next to the OpenShift v4.6 MacOSX Client entry and save the file.
Unpack and unzip the archive.
Move the oc binary to a directory on your PATH.

To check your PATH, open a terminal and execute the following command:
```
$ echo $PATH
```

After you install the OpenShift CLI, it is available using the oc command:

$ oc <command>

Installing the OpenShift CLI by using the web console

You can install the OpenShift CLI (oc) to interact with OpenShift Container Platform from a web console. You can install oc on Linux, Windows, or macOS.

If you installed an earlier version of oc, you cannot use it to complete all of the commands in OpenShift Container Platform 4.6. Download and install the new version of oc.

Installing the OpenShift CLI on Linux using the web console

You can install the OpenShift CLI (oc) binary on Linux by using the following procedure.

Procedure

From the web console, click ?.
Click Command Line Tools.
Select appropriate oc binary for your Linux platform, and then click Download oc for Linux.
Save the file.
Unpack the archive.
```
$ tar xvzf <file>
```
Move the oc binary to a directory that is on your PATH.

To check your PATH, execute the following command:
```
$ echo $PATH
```

After you install the OpenShift CLI, it is available using the oc command:

$ oc <command>

Installing the OpenShift CLI on Windows using the web console

You can install the OpenShift CLI (oc) binary on Winndows by using the following procedure.

Procedure

From the web console, click ?.
Click Command Line Tools.
Select the oc binary for Windows platform, and then click Download oc for Windows for x86_64.
Save the file.
Unzip the archive with a ZIP program.
Move the oc binary to a directory that is on your PATH.

To check your PATH, open the command prompt and execute the following command:
```
C:\> path
```

After you install the OpenShift CLI, it is available using the oc command:

C:\> oc <command>

Installing the OpenShift CLI on macOS using the web console

You can install the OpenShift CLI (oc) binary on macOS by using the following procedure.

Procedure

From the web console, click ?.
Click Command Line Tools.
Select the oc binary for macOS platform, and then click Download oc for Mac for x86_64.
Save the file.
Unpack and unzip the archive.
Move the oc binary to a directory on your PATH.

To check your PATH, open a terminal and execute the following command:
```
$ echo $PATH
```

After you install the OpenShift CLI, it is available using the oc command:

$ oc <command>

Installing the OpenShift CLI by using an RPM

For Red Hat Enterprise Linux (RHEL), you can install the OpenShift CLI (oc) as an RPM if you have an active OpenShift Container Platform subscription on your Red Hat account.

Prerequisites

Must have root or sudo privileges.

Procedure

Register with Red Hat Subscription Manager:
```
# subscription-manager register
```
Pull the latest subscription data:
```
# subscription-manager refresh
```

List the available subscriptions:

# subscription-manager list --available --matches '*OpenShift*'

In the output for the previous command, find the pool ID for an OpenShift Container Platform subscription and attach the subscription to the registered system:
```
# subscription-manager attach --pool=<pool_id>
```

Enable the repositories required by OpenShift Container Platform 4.6.

For Red Hat Enterprise Linux 8:

# subscription-manager repos --enable="rhocp-4.6-for-rhel-8-x86_64-rpms"

For Red Hat Enterprise Linux 7:

# subscription-manager repos --enable="rhel-7-server-ose-4.6-rpms"

Install the openshift-clients package:
```
# yum install openshift-clients
```

After you install the CLI, it is available using the oc command:

$ oc <command>

Installing the OpenShift CLI by using Homebrew

For macOS, you can install the OpenShift CLI (oc) by using the Homebrew package manager.

Prerequisites

You must have Homebrew (brew) installed.

Procedure

Run the following command to install the openshift-cli package:
```
$ brew install openshift-cli
```

Logging in to the OpenShift CLI

You can log in to the oc CLI to access and manage your cluster.

Prerequisites

You must have access to an OpenShift Container Platform cluster.
You must have installed the CLI.

To access a cluster that is accessible only over an HTTP proxy server, you can set the HTTP_PROXY, HTTPS_PROXY and NO_PROXY variables. These environment variables are respected by the oc CLI so that all communication with the cluster goes through the HTTP proxy.

Authentication headers are sent only when using HTTPS transport.

Procedure

$ oc login

Example output

Server [https://localhost:8443]: https://openshift.example.com:6443 (1)
The server uses a certificate signed by an unknown authority.
You can bypass the certificate check, but any data you send to the server could be intercepted by others.
Use insecure connections? (y/n): y (2)

Authentication required for https://openshift.example.com:6443 (openshift)
Username: user1 (3)
Password: (4)
Login successful.

You don't have any projects. You can try to create a new project, by running

    oc new-project <projectname>

Welcome! See 'oc help' to get started.

1	Enter the OpenShift Container Platform server URL.
2	Enter whether to use insecure connections.
3	Enter the user name to log in as.
4	Enter the user’s password.

If you are logged in to the web console, you can generate an oc login command that includes your token and server information. You can use the command to log in to the OpenShift Container Platform CLI without the interactive prompts. To generate the command, select Copy login command from the username drop-down menu at the top right of the web console.

You can now create a project or issue other commands for managing your cluster.

Using the OpenShift CLI

Review the following sections to learn how to complete common tasks using the CLI.

Creating a project

Use the oc new-project command to create a new project.

$ oc new-project my-project

Example output

Now using project "my-project" on server "https://openshift.example.com:6443".

Creating a new app

Use the oc new-app command to create a new application.

$ oc new-app https://github.com/sclorg/cakephp-ex

Example output

--> Found image 40de956 (9 days old) in imagestream "openshift/php" under tag "7.2" for "php"

...

    Run 'oc status' to view your app.

Viewing pods

Use the oc get pods command to view the pods for the current project.

When you run oc inside a pod and do not specify a namespace, the namespace of the pod is used by default.

$ oc get pods -o wide

Example output

NAME                  READY   STATUS      RESTARTS   AGE     IP            NODE                           NOMINATED NODE
cakephp-ex-1-build    0/1     Completed   0          5m45s   10.131.0.10   ip-10-0-141-74.ec2.internal    <none>
cakephp-ex-1-deploy   0/1     Completed   0          3m44s   10.129.2.9    ip-10-0-147-65.ec2.internal    <none>
cakephp-ex-1-ktz97    1/1     Running     0          3m33s   10.128.2.11   ip-10-0-168-105.ec2.internal   <none>

Viewing pod logs

Use the oc logs command to view logs for a particular pod.

$ oc logs cakephp-ex-1-deploy

Example output

--> Scaling cakephp-ex-1 to 1
--> Success

Viewing the current project

Use the oc project command to view the current project.

$ oc project

Example output

Using project "my-project" on server "https://openshift.example.com:6443".

Viewing the status for the current project

Use the oc status command to view information about the current project, such as services, deployments, and build configs.

$ oc status

Example output

In project my-project on server https://openshift.example.com:6443

svc/cakephp-ex - 172.30.236.80 ports 8080, 8443
  dc/cakephp-ex deploys istag/cakephp-ex:latest <-
    bc/cakephp-ex source builds https://github.com/sclorg/cakephp-ex on openshift/php:7.2
    deployment #1 deployed 2 minutes ago - 1 pod

3 infos identified, use 'oc status --suggest' to see details.

Listing supported API resources

Use the oc api-resources command to view the list of supported API resources on the server.

$ oc api-resources

Example output

NAME                                  SHORTNAMES       APIGROUP                              NAMESPACED   KIND
bindings                                                                                     true         Binding
componentstatuses                     cs                                                     false        ComponentStatus
configmaps                            cm                                                     true         ConfigMap
...

Getting help

You can get help with CLI commands and OpenShift Container Platform resources in the following ways.

Use oc help to get a list and description of all available CLI commands:

Example: Get general help for the CLI

$ oc help

Example output

OpenShift Client

This client helps you develop, build, deploy, and run your applications on any OpenShift or Kubernetes compatible
platform. It also includes the administrative commands for managing a cluster under the 'adm' subcommand.

Usage:
  oc [flags]

Basic Commands:
  login           Log in to a server
  new-project     Request a new project
  new-app         Create a new application

...

Use the --help flag to get help about a specific CLI command:

Example: Get help for the oc create command

$ oc create --help

Example output

Create a resource by filename or stdin

JSON and YAML formats are accepted.

Usage:
  oc create -f FILENAME [flags]

...

Use the oc explain command to view the description and fields for a particular resource:

Example: View documentation for the Pod resource

$ oc explain pods

Example output

KIND:     Pod
VERSION:  v1

DESCRIPTION:
     Pod is a collection of containers that can run on a host. This resource is
     created by clients and scheduled onto hosts.

FIELDS:
   apiVersion	<string>
     APIVersion defines the versioned schema of this representation of an
     object. Servers should convert recognized schemas to the latest internal
     value, and may reject unrecognized values. More info:
     https://git.k8s.io/community/contributors/devel/api-conventions.md#resources

...

Logging out of the OpenShift CLI

You can log out the OpenShift CLI to end your current session.

Use the oc logout command.

$ oc logout

Example output

Logged "user1" out on "https://openshift.example.com"

This deletes the saved authentication token from the server and removes it from your configuration file.