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Managing Pods Using Podman on RHEL

Unlike Docker’s single-container concept, Podman brings the ability to run multiple containers in a pod. In this lab, we will examine how to manage multiple containers as part of a pod. Upon completion of this lab, you will be able to use Podman to manage pods.

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Path Info

Level

Intermediate

Duration

1h 0m

Published

Apr 23, 2021

Challenge

Run a Rootless Pod
Perform the following tasks as a non-root user:
- Check for existing rootless containers and pods.
- Create a pod named wp-pod, with port 80 in the pod published to 8080 on the host.
- Check again for pods and containers, and confirm that you see an Infra container.
- Start the mariadb container:
  - Name the container wp-db
  - Add the container to the wp-pod pod
  - Set --restart=always
  - Use the mariadb short name for the container image
  - Set the following environment variables:
    
    MYSQL_ROOT_PASSWORD="dbpass"
    
    MYSQL_DATABASE="wp"
    
    MYSQL_USER="wordpress"
    
    MYSQL_PASSWORD="wppass"
- Check for containers again, and confirm that you see the mariadb container.
- Start the WordPress container:
  - Name the container wp-web
  - Add the container to the wp-pod pod
  - Set --restart=always
  - Use the wordpress short name for the container image
  - Set the following environment variables:
    
    WORDPRESS_DB_NAME="wp"
    
    WORDPRESS_DB_USER="wordpress"
    
    WORDPRESS_DB_PASSWORD="wppass"
    
    WORDPRESS_DB_HOST="127.0.0.1"
- Check for containers again, and confirm that you see the Wordpress container.
- Check connectivity with a curl command on localhost:8080. Since nothing is returned, immediately check the exit code and confirm it is 0.
- In a web browser, connect to the lab server's public IP address or DNS name on port 8080 and confirm that the Wordpress page is functional.
Challenge

Run a Rootfull Pod
Perform the following tasks as the root user:
- Become the root user.
- Check for existing rootfull containers and pods.
- Create a pod named root-wp-pod, with port 80 in the pod published to 8081 on the host.
- Check again for pods and containers, and confirm that you see an Infra container.
- Start the mariadb container:
  - Name the container root-wp-db
  - Add the container to the root-wp-pod pod
  - Set --restart=always
  - Use the mariadb short name for the container image
  - Set the following environment variables:
    
    MYSQL_ROOT_PASSWORD="dbpass"
    
    MYSQL_DATABASE="wp"
    
    MYSQL_USER="wordpress"
    
    MYSQL_PASSWORD="wppass"
- Check for containers again, and confirm that you see the mariadb container.
- Start the WordPress container:
  - Name the container root-wp-web
  - Add the container to the root-wp-pod pod
  - Set --restart=always
  - Use the wordpress short name for the container image
  - Set the following environment variables:
    
    WORDPRESS_DB_NAME="wp"
    
    WORDPRESS_DB_USER="wordpress"
    
    WORDPRESS_DB_PASSWORD="wppass"
    
    WORDPRESS_DB_HOST="127.0.0.1"
- Check for containers again, and confirm that you see the Wordpress container.
- Check connectivity with a curl command on localhost:8081. Since nothing is returned, immediately check the exit code and confirm it is 0.
- In a web browser, connect to the lab server's public IP address or DNS name on port 8081 and confirm that the Wordpress page is functional.
Challenge

Manage a Rootless Pod
Perform the following tasks as a non-root user:
- Check for any containers and pods that are running, which should include the wp-pod pod and its containers.
- Stop the wp-pod pod, along with its containers.
- Check the pods and containers again, and confirm that they have been stopped.
- Start the wp-pod pod, along with all its containers.
- Check the pods and containers again, and confirm that they have been started.
- Restart the wp-pod pod, along with all its containers.
- Check the pods and containers again, and confirm that they have been restarted.
- Get information about the wp-pod pod.
- List the wp-pod pod's processes.
- Kill and remove the wp-pod pod and its containers.
- Check the pods and containers again, and confirm that they have been removed.
- Clean up any reclaimable space using podman system commands, and confirm it has been cleaned up.
Challenge

Manage a Rootfull Pod
Perform the following tasks as the root user:
- Become the root user.
- Check for any containers and pods that are running, which should include the root-wp-pod pod and its containers.
- Pause the root-wp-pod pod, along with its containers.
- Check the pods and containers again, and confirm that they have been paused.
- Unpause the root-wp-pod pod.
- Check the pods and containers again, and confirm that they have been unpaused.
- Pull performance statistics for the root-wp-pod pod and its containers.
- Stop the root-wp-pod pod.
- Clean up any reclaimable space using podman system and podman pod commands, and confirm it has been cleaned up.

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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