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How to Make Interactive Containers in OpenShift

Sometimes it is necessary to have a container that can run in an OpenShift cluster and allow you to interact with it. For example, as part of development you made need to launch a container within a cluster and manually run commands within the container. This guide shows how to enable this for a container in OpenShift.

Note

Before you start

This how-to assumes that you have an OpenShift cluster and access to it with the oc tool.

Ingredients

  1. A Kubernetes cluster
  2. A node with the oc tool that is logged into the cluster.

Instructions

  1. Open the deployment resource in a text editor. For example,

    kubectl edit deployment <deployment-name>

  2. Add or edit the following lines in the deployment resource:

kind: Deployment
apiVersion: apps/v1
...
spec:
  ...
  template:
    ...
    spec:
      containers:
         - name: <container-name>
           ...
           command:
             - /bin/bash # or any other command that will keep the container running
           stdin: true
           tty: true

  1. Save the changes and exit the editor. This should cause the deployment to update and the container to restart.

  2. Open a terminal and run the following command to get a shell in the container:

kubectl exec -it <pod-name> -- /bin/bash