Configure Pod Initialization

    You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. It is recommended to run this tutorial on a cluster with at least two nodes that are not acting as control plane hosts. If you do not already have a cluster, you can create one by using or you can use one of these Kubernetes playgrounds:

    To check the version, enter .

    In this exercise you create a Pod that has one application Container and one Init Container. The init container runs to completion before the application container starts.

    Here is the configuration file for the Pod:

    In the configuration file, you can see that the Pod has a Volume that the init container and the application container share.

    The init container mounts the shared Volume at /work-dir, and the application container mounts the shared Volume at /usr/share/nginx/html. The init container runs the following command and then terminates:

    1. wget -O /work-dir/index.html http://info.cern.ch

    Notice that the init container writes the index.html file in the root directory of the nginx server.

    Create the Pod:

      The output shows that the nginx container is running:

      Get a shell into the nginx container running in the init-demo Pod:

      1. kubectl exec -it init-demo -- /bin/bash

      In your shell, send a GET request to the nginx server:

      The output shows that nginx is serving the web page that was written by the init container:

      1. <html><head></head><body><header>
      2. <title>http://info.cern.ch</title>
      3. </header>
      5. <h1>http://info.cern.ch - home of the first website</h1>
      6.   <li><a href="http://info.cern.ch/hypertext/WWW/TheProject.html">Browse the first website</a></li>
      7.   ...