Managing Openshift resources using oc command-line tool

Openshift Container Platform, as already described in our post can be managed using:

• the web console
• a command line tool, called oc

In this guide, we'll analyze in deep how to modify and manage Openshift resources using the oc command.

Installing oc command-line tool.

When you install Openshift, the oc client is automatically installed on all the nodes of the cluster.

If you need, you can also install oc on another external node, from which you desire to manage the cluster.

• If you're using RHEL, you can install it using the command:

    sudo yum install atomic-openshift-clients

• For other distros, you can find it on openshift-origin Github page https://github.com/openshift/origin/releases

Let's review all the main commands.

command	action
oc login https://master.org.com -u admin -p mypass	login into Openshift cluster as admin, with password mypass
oc logout	logout from Openshift
oc whoami	check current user
oc new-project myproject	create a new-project named myproject
oc delete project myproject	delete the project myproject
oc status	check the status of the cluster you have been logged to
oc get all	get all the most important resources of the cluster
oc get <pods | deployments | routes |  --->	get the specified resource in the current project
oc describe <resource_name>	get all the information about a specific resource
oc export <resource_name>	export the definition of a resource, for backup use, in YAML format
oc create  <resource_type> <resource_name>	create the specific resource
oc exec	similar to docker exec, execute commands inside a container
oc rsh <pod_name>	open a remote shell session on a container
oc get events	get information about life-cycle events in the current project,  as pod creation and deletion, scheduling and nodes status
oc logs <pod_name>	retrieve pod logs
oc rsync <pod_name>:<pod_dir> <local_dir> -c <container_name>	copy the content from a directory of a pod into a local directory
oc rsync <local_dir> <pod_name>:<pod_dir> -c <container_name>	copy the content of a local directory to a directory of a pod
oc port-forward <pod_name> <local_port>:<remote_port>	forward a local port to a pod