Build and Push Docker images to DockerHub using Jenkins pipeline

We are going to build an Docker image and push the image to Dockerhub using Jenkins pipeline.

We have already installed the Jenkins and done the required settings.

• step 1: Add your user to the docker group This command adds your current user to the docker group, which grants permission to access the Docker socket

sudo usermod -aG docker jenkins

• step 2: Now restart the Jenkins using

sudo systemctl restart jenkins

• step 3:
  Install docker related plugins in jenkins
  docker
  docker commons
  docker API
  docker pipeline
  docker-build-step
  CloudBees Docker Build and Publish

• step 4:
  Login to Dockerhub and create a personal access token.

• step 5: Add the created personal access token to jenkins credentials

• step 6: Created a Dockerfile on the Github project Repository

kannan@kannan-PC:~/dockerhub_jenkins$ vi Dockerfile
kannan@kannan-PC:~/dockerhub_jenkins$ cat Dockerfile 
FROM ubuntu:22.04
ENV DEBIAN_FRONTEND=noninteractive
RUN apt update
RUN apt install apache2 -y
RUN apt install apache2-utils -y
RUN apt clean
COPY index.html /var/www/html
EXPOSE 80
CMD ["apache2ctl","-D","FOREGROUND"]
kannan@kannan-PC:~/dockerhub_jenkins$ vi index.html
kannan@kannan-PC:~/dockerhub_jenkins$ cat index.html 
<h1>Image created and push to Dockerhub</h1>

• step 7: Create a jenkinsfile and add to the Gitghub project Repository

kannan@kannan-PC:~/dockerhub_jenkins$ vim Jenkinsfile
kannan@kannan-PC:~/dockerhub_jenkins$ cat Jenkinsfile 
pipeline {
  agent any
  options {
    buildDiscarder(logRotator(numToKeepStr: '5'))
  }
  environment {
    DOCKERHUB_CREDENTIALS = credentials('kannanb95-dockerhub')
  }
  stages {
    stage('Build') {
      steps {
        sh 'docker build -t kannanb95/kaniyam:latest .'
      }
    }
    stage('Login') {
      steps {
        sh 'echo $DOCKERHUB_CREDENTIALS_PSW | docker login -u $DOCKERHUB_CREDENTIALS_USR --password-stdin'
      }
    }
    stage('Push') {
      steps {
        sh 'docker push kannanb95/kaniyam:latest'
      }
    }
  }
  post {
    always {
      sh 'docker logout'
    }
  }
}
kannan@kannan-PC:~/dockerhub_jenkins$ ls
Dockerfile  index.html  Jenkinsfile  README.md

Now add,commit and push to the git main

kannan@kannan-PC:~/dockerhub_jenkins$ git add .
kannan@kannan-PC:~/dockerhub_jenkins$ git status
On branch main
Your branch is up to date with 'origin/main'.

Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
    new file:   Dockerfile
    new file:   Jenkinsfile
    new file:   index.html

kannan@kannan-PC:~/dockerhub_jenkins$ git commit -m "commit dockerhub_jenkins"
[main 5b006c5] commit dockerhub_jenkins
 3 files changed, 41 insertions(+)
 create mode 100644 Dockerfile
 create mode 100644 Jenkinsfile
 create mode 100644 index.html
kannan@kannan-PC:~/dockerhub_jenkins$ git push origin main
Enumerating objects: 6, done.
Counting objects: 100% (6/6), done.
Delta compression using up to 8 threads
Compressing objects: 100% (4/4), done.
Writing objects: 100% (5/5), 884 bytes | 884.00 KiB/s, done.
Total 5 (delta 0), reused 0 (delta 0), pack-reused 0
To github.com:kannanb95/dockerhub_jenkins.git
   397a453..5b006c5  main -> main

• step 8: Configure the pipeline definition as "pipeline script from SCM" and add the "Github project Repository URL" and branch as "main"

Build the Jenkins pipeline
Successfully completed the build verify the build history "Console output"