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Problem Statement

The Nautilus application development team requires custom Docker images for a project. You need to create a Dockerfile on App Server 1 in Stratos Datacenter to build an image with the following specifications:

  • Use ubuntu as the base image.
  • Install apache2 and configure it to listen on port 8082 (without modifying any other Apache configuration settings like document root).

Solution

1. Create the Dockerfile

Create a Dockerfile with the required configuration at /opt/docker/Dockerfile on App Server 1.

Dockerfile Contents:

# Use the official Ubuntu image as the base
FROM ubuntu

# Update package lists and install apache2
RUN apt update && apt install -y apache2

# Configure Apache to listen on port 8082
RUN sed -i 's/80/8082/g' /etc/apache2/ports.conf

# Set Apache to run in the foreground
ENTRYPOINT ["/usr/sbin/apachectl", "-D", "FOREGROUND"]

Explanation:

  • FROM ubuntu: This sets the base image to Ubuntu.
  • RUN apt update && apt install -y apache2: Updates the package lists and installs the Apache2 web server.
  • RUN sed -i 's/80/8082/g' /etc/apache2/ports.conf: Changes the default port from 80 to 8082 in the Apache configuration file ports.conf.
  • ENTRYPOINT ["/usr/sbin/apachectl", "-D", "FOREGROUND"]: Configures Apache to run in the foreground, which is necessary for it to stay running inside the container.

2. Build the Docker Image

Once the Dockerfile is created, build the Docker image using the following command:

docker build -t apache:test /opt/docker

Explanation:

  • docker build -t apache:test /opt/docker: This command builds a Docker image from the Dockerfile located in /opt/docker. The -t apache:test option tags the image with the name apache and the tag test.

3. Verify the Image

To ensure the image was created correctly, you can list the Docker images and check for apache:test:

docker images

Expected output:

REPOSITORY   TAG       IMAGE ID       CREATED         SIZE
apache       test      <IMAGE_ID>     <TIME>          <SIZE>

This output confirms that the image has been successfully built and tagged.