Red Hat OpenShift Development I: Introduction to Containers with Podman

Instructions

1. The lab command starts the basics-podman-secret container, which contains the /etc/secret-file file.

   Copy the /etc/secret-file file from the container to the $HOME/DO188/labs/basics-podman/solution file.

   1. Use the podman ps command to verify that the basics-podman-secret container is running.

      [student@workstation ~]$ podman ps --format='{{.Names}}'
      basics-podman-secret

   2. Use the ls command inside of the container to verify that the container contains the /etc/secret-file file.

      [student@workstation ~]$ podman exec basics-podman-secret ls /etc/secret-file
      /etc/secret-file

   3. Change into the $HOME/DO188/labs/basics-podman directory, for example:

      [student@workstation ~]$ cd ~/DO188/labs/basics-podman
      [student@workstation basics-podman]$ ls
      index.html

   4. Copy the /etc/secret-file file from the container as the solution file in the $HOME/DO188/labs/basics-podman directory.

      [student@workstation basics-podman]$ podman cp \
      basics-podman-secret:/etc/secret-file solution
      [student@workstation basics-podman]$ ls
      index.html  solution

      The first objective of the lab script is passing.

   Hide Solution

2. Start a new container with the following parameters:

   • Name: basics-podman-server

   • Image: registry.ocp4.example.com:8443/ubi8/httpd-24

   • Ports: Route traffic from port 8080 on your machine to port 8080 inside of the container

   • Network: lab-net

   You can start the container in the detached mode for greater convenience.

   1. Create the lab-net Podman network.

      [student@workstation ~]$ podman network create lab-net
      lab-net

      The next objective of the lab script is passing.

   2. Execute the podman run command to start the container.

      [student@workstation basics-podman]$ podman run -d --name basics-podman-server \
      --net lab-net -p 8080:8080 registry.ocp4.example.com:8443/ubi8/httpd-24
      8b747...3616

      Additional objectives of the lab script are passing.

   Hide Solution

3. Copy the $HOME/DO188/labs/basics-podman/index.html file to /var/www/html/ in the basics-podman-server container.

   1. Verify that you are in the correct directory.

      [student@workstation basics-podman]$ ls
      index.html  solution

   2. Copy the index.html file in to the container.

      [student@workstation basics-podman]$ podman cp index.html \
      basics-podman-server:/var/www/html/

   3. In a web browser, navigate to localhost:8080 and verify that you see the Hello from Podman Basics lab text.

      The next objective of the lab script is passing.

   Hide Solution

4. Start a new container with the following parameters:

   • Name: basics-podman-client

   • Image: registry.ocp4.example.com:8443/ubi8/httpd-24

   • Network: lab-net

   You can start the container in the detached mode for greater convenience.

   1. Execute the podman run command to start the container.

      [student@workstation basics-podman]$ podman run -d --name basics-podman-client \
      --net lab-net registry.ocp4.example.com:8443/ubi8/httpd-24
      8b747...3616

   Hide Solution

5. Confirm that the basics-podman-client container can access the basics-podman-server container by its DNS name. Use the podman exec and curl commands to make a request to the basics-podman-server container at port 8080 from the basics-podman-client container.

   1. Confirm that DNS is enabled on the lab-net network.

      [student@workstation basics-podman]$ podman network inspect lab-net
      ...output omitted...
                "dns_enabled": true,
      ...output omitted...

   2. Use the curl command inside of the basics-podman-client to confirm that the basics-podman-server container is accessible from the lab-net network by its DNS name.

      [student@workstation basics-podman]$ podman exec basics-podman-client \
      curl -s http://basics-podman-server:8080 && echo
      <h1>Hello from Podman Basics lab</h1>

      All remaining objectives are passing.

   Hide Solution