docker
Imani is a RHEL Engineer at Red Hat. He wants to teach a young class of engineers about Docker by showing them examples of how to pull Docker images, create, start an stop containters, remove containers, and anything else that a young engineer should know about Docker. Please assume that Imani wants to show several examples using the Apache web server Docker image. Please write a lecture that includes examples that will increase the engineers' mastery of Docker using Apache for the examples.
Certainly! Here's a lecture for Imani to teach the young engineers about Docker using examples with the Apache web server Docker image:
"Hello, everyone! Today, we're going to dive into Docker and learn how to work with it effectively. Docker is a powerful tool that allows us to package applications into containers for easy deployment and scalability. To demonstrate Docker's capabilities, we'll be using the Apache web server Docker image as an example. So, let's get started!
First, let's pull the Apache web server Docker image from Docker Hub using the following command:
docker pull httpd:latest
This command will download the latest version of the Apache web server image onto your system. Make sure you have a working internet connection for this step.
Once the image is downloaded, we can create a container and start an Apache web server. Use the following command:
docker run -d --name my-apache-container -p 80:80 httpd:latest
This command creates a new container named 'my-apache-container' based on the 'httpd' image, maps the container's port 80 to the host's port 80, and starts the container in the background.
To check if the container is running, use the command:
docker ps
This will display a list of the running containers. Look for 'my-apache-container' in the output.
Now that the Apache web server is running, open a web browser and enter 'http://localhost' to access the default Apache landing page. Congratulations! You have a running Apache web server inside a Docker container.
To stop the container, use the following command:
docker stop my-apache-container
This command will gracefully stop the container.
If you want to remove the container, run the following command:
docker rm my-apache-container
This will delete the container from your system.
Now, let's explore a couple more features of Docker. First, let's say you want to run the Apache web server container again, but this time you want to customize the web page. We can achieve this by creating a custom HTML file on your local system, and then mapping it to the container's default web page location. Use the following command:
docker run -d --name my-custom-apache -p 80:80 -v /path/to/your/html:/usr/local/apache2/htdocs httpd:latest
Replace '/path/to/your/html' with the actual path to your custom HTML file. This command will create a new container named 'my-custom-apache', map the container's port 80 to the host's port 80, and mount your custom HTML file to the container's web server root directory.
Finally, let's discuss Docker image management. To list all the Docker images on your system, run the command:
docker images
This will display a list of all the images you have pulled onto your system. You should see 'httpd' among the images.
To remove an image, use the command:
docker rmi httpd:latest
This will remove the 'httpd' image from your system.
Remember, Docker provides a wide range of functionalities beyond what we covered today. I encourage you to explore more advanced Docker features and experiment with other images and applications.
That's all for today's Docker lecture. I hope you found it informative and inspiring. Docker is an invaluable tool that can greatly simplify application deployment and management. Happy containerization!"