Docker Ports Mapping.md

Problem Statement

The Nautilus DevOps team is preparing to host an application using an nginx-based container. A ticket has been assigned to set up an nginx container on Application Server 3 in the Stratos Datacenter. The specific tasks are as follows:

• Pull the nginx:alpine-perl Docker image on Application Server 3.
• Create a container named demo using the pulled image.
• Map the host port 8089 to the container port 80.
• Ensure that the container is running at the end of the setup.

Solution

Follow these steps to complete the setup:

1. Pull the Docker Image

   First, pull the nginx:alpine-perl image from the Docker repository. This image includes nginx with Perl support and is based on the Alpine Linux distribution.

   docker pull nginx:alpine-perl

   This command downloads the image to your local Docker environment on Application Server 3.

2. Create and Run the Container

   Next, create and run a new container named demo using the nginx:alpine-perl image. Map the host port 8089 to the container port 80 to make the web service accessible on port 8089 of the host.

   docker run -d -it --name=demo -p 8089:80 nginx:alpine-perl

   In this command:

   • -d runs the container in detached mode, so it operates in the background.
   • -it allows for interactive terminal access if needed.
   • --name=demo assigns the name demo to the container.
   • -p 8089:80 maps port 8089 on the host to port 80 inside the container, enabling access to the nginx web server from the host’s port 8089.
   • nginx:alpine-perl specifies the image to use for creating the container.

3. Verify the Container is Running

   After running the container, confirm that it is up and running by listing all active containers:

   docker container ls

   Look for the demo container in the output to ensure it is in a running state.