DevOps project using Git, Jenkins, ansible and Docker

In this project, we will be see how to use Git, Jenkins, Ansible, DockerHub, Docker to DEPLOY on a docker container.,

*Follow this project *

PreRequisites

Git
Jenkins
Ansible
Setup ansible client and install docker.
Docker Hub account

Stage-01 : Create a web page

Put all the web page code file into github

Stage-02 : Create a Docker file

Create a Docker file into github

FROM centos:latest
MAINTAINER choudharysirvi1212@gmail.com
RUN yum install httpd git -y
RUN git clone https://github.com/praveensirvi1212/webdev /var/www/html
WORKDIR /var/www/html
CMD ["/usr/sbin/httpd","-D","FOREGROUND"]
EXPOSE 80

Stage-03 : Jenkins configuration

Install java and git
Install jenkins
Login to Jenkins console
Create Jenkins job with free style, Fill the following details,
- Source Code Management:
  - Repository : https://github.com/praveensirvi1212/Docker.git
  - Branches to build : */main
- Build:
  - Send files or execute commands over SSH
    - Name: jenkins_server
    - Exec Command:
      - rsync -avh /var/lib/jenkins/workspace/web/Dockerfile root@ansible-server's_private-ip:/opt
  - Send files or execute commands over SSH
    - Name: ansible_server
    - Exec Command:
      - cd /opt/docker
      - docker image build -t $JOB_NAME:v1.$BUILD_ID .
      - docker image tag $JOB_NAME:v1.$BUILD_ID praveensirvi/$JOB_NAME:v1.$BUILD_ID
      - docker image tag $JOB_NAME:v1.$BUILD_ID praveensirvi/$JOB_NAME:latest
      - docker image push praveensirvi/$JOB_NAME:v1.$BUILD_ID
      - docker image push praveensirvi/$JOB_NAME:latest
      - docker image rmi $JOB_NAME:v1.$BUILD_ID praveensirvi/$JOB_NAME:v1.$BUILD_ID praveensirvi/$JOB_NAME:latest

So for we used latest docker image to build a container, but what happens if latest version is not working?
One easiest solution is, maintaining version for each build. This can be achieved by using environment variables.

Here we use 2 variables

BUILD_ID - The current build id
JOB_NAME - Name of the project of this build. This is the name you gave your job when you first set it up.
- Post Build:
  - Send files or execute commands over SSH
    - Name: ansible_server
    - Exec Command:
      - ansible-playbook /playbooks/docker.yml

Login to Docker host and check images and containers. (no images and containers)
login to docker hub and check. shouldn't find images with for job_name:v1.build_id
Execute Jenkins job
check images in Docker hub. Now you could able to see new images pushed to Valaxy Docker_Hub

Troubleshooting:

Docker should be installed on ansible server
Should login to "docker hub" on ansible server
Docker admin user should be part of docker group

Stage-04 : Ansible_server

Install Ansible and Docker
Start Docker daemon
Login into Docker Hub

Write a yml file to create a container (file name : /playbooks/docker.yml)

  ---
  - hosts: web
    tasks:
       - name: stop container
         shell: docker container stop myweb
       - name: remove container
         shell: docker container rm myweb
       - name: remove docker image
         shell: docker image rm praveensirvi/web
       - name: docker container create
         shell: docker run -d --name myweb -p 8080:80 praveensirvi/web

Troubleshooting: Makesure you have opened required ports on AWS Security group for this server.

Stage-05 : Apache_server

Install Docker and start Docker daemon

Final output :

References

[1] - Jenkins Docs - Building Software Projects

praveensirvi1212 / webdev