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Command line tool usage

Rahti can be used via the command line either with OpenShift's oc tool or with the kubectl tool from Kubernetes. Certain features specific to OpenShift are only available when using the oc tool.

How to install the oc tool

The oc tool is a single binary that only needs to be included in your path. You may download it from the latest release page in GitHub. The detailed instructions are:

• Go to the aforementioned release page (https://github.com/openshift/origin/releases/latest). In the bottom you will see the list of clients. Download the "Openshift origin client" corresponding to your OS (Windows, Mac or Linux).
• Once downloaded, extract the oc binary file.
• Copy the file to a folder in your $PATH and make it executable. For Mac and Linux the steps are similar to the following:

$ echo $PATH
/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:~/bin
$ mkdir -p ~/bin
$ cp oc ~/bin/
$ chmod +x ~/bin/oc

In the example above, we are displaying the contents of the $PATH variable, choosing the bin folder in the home (~) folder, using mkdir just to be sure that the folder exist, copy the oc command (of course, we have to be in the folder oc was downloaded), and finally adding executable (+x) permissions to the oc binary. That is all.

In order to test that it was properly installed, open a new terminal, go to any folder, and run:

$ oc --help

It should show the list of all available commands.

The "Command Line Tools" page in the OpenShift web UI

Instructions for downloading the oc tool and logging in via the command line can be found in the "Command Line Tools" page in the web interface:

The oc tool is a single binary that only needs to be included in your path. The oc login command to login can be found in one of the fields on the page. There is a button next to it for copying the command to the clipboard:

Copy the command and paste it in a terminal to start using OpenShift via the command line.

Note

If you open multiple terminals, the login session for oc will be active in all of them.

CLI cheat sheet

Basic usage:

oc <command> <--flags>
oc help <command>

Examples:

Authorize the CLI tool to the cluster:

oc login https://rahti.csc.fi:8443 --token=<secret access token>

This command can be obtained by clicking your usename and "Copy Login Command" in the web console:

Show projects:

oc projects

Switch to project my-project:

oc project my-project

Show all pods in the current namespace:

oc get pods

Show all pods in the namespace <my-other-name-space>:

oc get pods -n <my-other-namespace>

Show all pods that have the key-value pair app: myapp in metadata.labels:

oc get pods --selector app=myapp

Print the specifications of the pod mypod

oc get pod mypod -o yaml

Other useful commands

• oc create creates an object. Example: oc create -f file.yaml
• oc replace replaces an object. Example: oc replace -f file.yaml
• oc delete deletes an object in OpenShift. Example: oc delete rc myreplicationcontroller
• oc apply modifies an object according to the input. Example oc apply -f file.yaml
• oc explain prints out the API documentation. Example: oc explain dc.spec
• oc edit loads an object from the API to the local editor chosen by the $EDITOR environment variable. Example: oc edit DeploymentConfig mydc

Abbreviations

Object types have abbreviations that are recognized in the CLI:

Abbreviation	Meaning
is	ImageStream
dc	DeploymentConfig
svc	Service
bc	BuildConfig
rc	ReplicationController
pvc	PersistentVolumeClaim

Further documentation

See the official documentation for more information about using the command line interface:

• OpenShift documentation: CLI reference

Last edited Mon Oct 19 2020