Docker Swarm

Docker and Jenkins Setup Guide

This guide walks you through the process of setting up two Docker containers using Dockerfiles, linking them with Docker Compose, and configuring Jenkins in a Docker swarm environment.

Prerequisites

• Docker Desktop or Docker Daemon installed

Steps

1. Create Dockerfile 1

Create the first Dockerfile with the required format and specifications. (Example given in the same folder)

2. Create Dockerfile 2

Create the second Dockerfile with the required format and specifications. (Example given in the same folder)

3. Create Docker Compose File

Create a Docker Compose file that links Dockerfile 1 and Dockerfile 2. Ensure that the services are properly defined and can communicate with each other. (Example given in the same folder)

4. Open Terminal and Docker Desktop

• Open your computer terminal.
• Open Docker Desktop. If you do not have Docker Desktop, start the Docker Daemon using the command:

  dockerd
  

5. Change Directory to Dockerfile 1

Navigate to the directory where Dockerfile 1 is located: cd /path/to/Dockerfile1

6. Create the Image for Dockerfile 1

Build the Docker image for Dockerfile 1 using the command: docker build .

7. Change Directory to Dockerfile 2

Navigate to the directory where Dockerfile 2 is located: cd /path/to/Dockerfile2

8. Create the Image for Dockerfile 2

Build the Docker image for Dockerfile 2 using the command: docker build .

9. Go to the Directory of the Docker Compose File

Navigate to the directory where the Docker Compose file is located: cd /path/to/docker-compose-file

10. Run Docker Compose

Run the Docker Compose file to start the services: docker-compose -f <filename.yml> up

11. Verify Containers are Running

Ensure that both containers are up and running using the command: docker ps

12. Set Up Jenkins

Try to access it using the chosen local host IP, if it does not run, use the following command inside the container java -jar /usr/share/java/jenkins.war

The command to enter the container as a host is: docker exec -u 0 -it container-name bash

13. Install Jenkins Plugins

Finish installing the required plugins for Jenkins.

14. Start Docker Daemon in Container

Run the Docker Daemon within the container: dockerd

15. Initialize Docker Swarm

Initialize Docker Swarm in the container, making it the managing node: docker swarm init this container will then become the managing node for the swarm, copy the given token in order to join the swarm in the other container.

16. Run the other container and repeat the same steps, but join the swarm as worker.