Advanced Container Management Using Podman on RHEL

You will first work with Podman container storage!

Container Storage Using a Directory

• Create a directory named ~/html.
• Create 3 text files in your new ~/html directory:
  • Name these test1.txt, test2.txt, and test3.txt.
  • Make the contents "Test File 1", "Test File 2", and "Test File 3".
• Start 3 nginx containers:
  • Name them web1, web2, and web3.
  • Attach the ~/html directory to the container at /usr/share/nginx/html/.
• Run a curl command inside each container to test.
  • Try pulling each of your text files.
• Stop and remove all 3 containers.

Container Storage Using a Container Volume

• Create a new container storage volume named webvol.
• Start 3 nginx containers:
  • Name them web1, web2, and web3.
  • Attach the webvol volume to the container at /usr/share/nginx/html/.
• Copy the 3 text files from ~/html into the web1 container to the /usr/share/nginx/html/ directory.
• Run an ls command inside of each container to list the contents of the /usr/share/nginx/html/ directory.
  • You should see the 3 text files.
• Run a curl command inside each container to test.
  • Try pulling each of your text files.
• Stop and remove all 3 containers.

You can now proceed to the next objective!

Now you can make your nginx web servers available outside of their containers!

Publish Your Web Servers' Ports

• Start 3 nginx containers:
  • Name them web1, web2, and web3.
  • Attach the webvol volume to the container at /usr/share/nginx/html/.
  • Publish the containers' port 80:
    • 8081 (web1)
    • 8082 (web2)
    • 8083 (web3)
• Check the published container ports.
• Run curl commands on your host:
  • Pull the 3 test text files from the 3 web server containers.
• Stop and remove all 3 containers.

Now you can try setting up some container healthchecks!

Now that you have your web server containers up and running with shared storage and networking, add a check that validates that nginx is available.

Configure Healthchecks For Your Web Servers

• Start 3 nginx containers:
  • Name them web1, web2, and web3.
  • Attach the webvol volume to the container at /usr/share/nginx/html/.
  • Publish the containers' port 80:
    • 8081 (web1)
    • 8082 (web2)
    • 8083 (web3)
  • Add a healthcheck for each server:
    • 'curl http://localhost || exit 1'
    • Set the healthcheck interval to 0
• Run curl commands on your host.
  • Pull the 3 test text files from the 3 web server containers.
• Run the healthchecks for all 3 servers.
  • Validate that the nginx service is healthy on all 3 servers.

Your containers are looking great now! Now you can take a look at your Podman host.

With healthy containers, check out the host.

Managing Your Podman System

• Display system information for your Podman host.
• Display Podman's disk space utilization.
  • Use regular and verbose modes.
• Clean up unused data using prune.
• Display Podman's disk space utilization again.

All cleaned up!

Monitoring Your Podman System

• Take a look at events from the last 10 minutes.
• Display all prune events for the past 15 minutes.

Looks good!