So, you've got this fantastic Node.js app, and now you're thinking, "How can I make the development and deployment process smoother than a freshly paved road?" Well, my friend, the answer lies in creating a robust CI/CD pipeline using Docker and Jenkins. Buckle up, because we're about to embark on a journey of automation and efficiency!

What's CI/CD, Anyway?

Before we dive in, let's quickly chat about CI/CD. CI stands for Continuous Integration, where code changes from multiple contributors are automatically merged into a shared repository. CD, on the other hand, expands to Continuous Delivery or Continuous Deployment, ensuring that your code is always in a deployable state.

Step 1: Setting Up Jenkins

First things first, let's get Jenkins up and running. Install Jenkins on your server, and don't forget to grab some coffee while you wait. Once Jenkins is installed, access the web interface and set up your pipelines. you can see the guide install jenkins

Articel related : Setup Jenkins on Kubernetes

Step 2: Dockerizing Your Node.js App

Time to containerize! Create a Dockerfile for your Node.js app, specifying the base image, dependencies, and commands to run your app. Docker makes your app independent of the environment, ensuring consistency across different stages of your pipeline.

Articel related : How to Setup Docker Containers as Build Agents for Jenkins

Create a Docker file for apps dockerized

Here, I use my project  github link  :  node-dockerized-projects 

Step 3: Jenkins Pipeline Configuration

Now, let's tell Jenkins what to do. Create a Jenkinsfile in your project repository, defining the stages of your pipeline. This file will be your guiding light for Jenkins, ensuring it knows how to build, test, and deploy your app.

In a Jenkins pipeline, Groovy code is typically defined in a Jenkins file, which is a text file containing the pipeline definition. Jenkins files are written in the Groovy programming language and are used to define stages, phases, and other components of a process.

There are many stages checkout, test,build, build image, docker push to docker hub and docker run

1. Stage CheckOut

In a jenkins pipelines the checkout stage is stage use fetch form version control system (SCM).SCM. Here, i use Github as my version control system ( SCM).

In pipelines, in the agent section, you can specify the agent node. If you're using a remote Docker host to deploy a Node.js application, you can refer to the guide on adding a Docker agent in Jenkins. Like the slave-devopsgol

Complete Pipelines Jenkinsfile

Step 4: Docker Registry Credentials

To push your Docker image to a registry, you'll need credentials. In Jenkins, go to "Manage Jenkins" > "Manage Credentials" > "Jenkins" > "Global credentials" and add your Docker Hub or any other registry credentials.

Articel Related : HOW TO INTEGRATION OF SLACK NOTIFICATIONS WITH JENKINS

Step 5: Run Your Pipeline in jenkins

Once you've finished generating the Dockerfile and Jenkinsfile steps, now you can create job pipelines to execute that Jenkinsfile.

Well's running container for docker remote host and test curl port apps node.js is running well's

# docker ps  -a  | grep deploy-apps-nodejs-devopsgol-test-successfully

511915f0e75f   adinugroho251/my-node-app:latest              "docker-entrypoint.s…"   About a minute ago   Up About a minute   0.0.0.0:33052->3000/tcp, :::33052->3000/tcp                                            deploy-apps-nodejs-devopsgol-test-successfully

# curl  10.20.40.45:33052

Hello World!

Conslusion

It's showtime! Trigger your Jenkins pipeline and watch the magic happen. Jenkins will fetch your code, build, test, and deploy it in a seamless flow. Sit back and enjoy the automation symphony!

Congratulations, you've just built a CI/CD pipeline for your Node.js app using Docker and Jenkins. Now, every code change will go through this automated process, ensuring reliability and speed in your development lifecycle. Happy coding! 🚀

• Usage : Select Usage this is node much as possible  for node ssh
• Lauch Method : Select agent ssh for add node  docker with ssh agent
• Host  :  Input IP ADDRESS OR Hostname Docker Host 
• Credentials :   Select Credentials for docker host. 

 Save the configuration.

Related Articel :  How to Install Kubernetes on Ubuntu 20.04

Step 2 : Create user  jenkins  and install java for docker host

Add user jenkins in docker host

#  adduser jenkins

Add entri file  below this paragraph  in visudo

# Allow members of group sudo to execute any command

%sudo   ALL=(ALL:ALL) ALL

jenkins ALL=(ALL) NOPASSWD: ALL

# See sudoers(5) for more information on "@include" directives:

Install package java for  requiretment jenkins agent 

# sudo apt install default-jre -y

Verify java version 

# java --version

openjdk 11.0.21 2023-10-17

OpenJDK Runtime Environment (build 11.0.21+9-post-Ubuntu-0ubuntu122.04)

OpenJDK 64-Bit Server VM (build 11.0.21+9-post-Ubuntu-0ubuntu122.04, mixed mode, sharing)

Step 3 :  Install Docker  Plugin

 

In the Jenkins dashboard, navigate to "Manage Jenkins" > "Manage Plugins." >> Select Plugins --> Install

Select  Plugin this below : 

CloudBees Docker Build and Publish plugin Version 1.4.0

CloudBees Docker Custom Build Environment Plugin Version 1.7.3

CloudBees Docker Hub/Registry Notification Version 2.7.1

Docker

Step 4:  CI/CD : Automation Deploy Application HTML Using Jenkins

Fantastic! Adding a Docker node is a great step. Now, let's dive into deploying that simple HTML application via Jenkins. Here's a brief guide for you:

Prerequisites 

1. Docker Hub 
2. Jenkins Server is running 
3. Dockerfile
4. Jenkinsfile

Absolutely, adding Docker Hub credentials to Jenkins is a smart move for secure and seamless integration.

Add  Credentials for docker hub 

Example Dockerfile  

FROM nginx:latest

COPY ./html/. /usr/share/nginx/html/.

EXPOSE 80

Example Jenkinsfile 

pipeline {

    agent any

    stages{

        stage("checkout"){

            steps{

                checkout scm

            }

        }

        stage("Build Image"){

            steps{

                sh 'sudo docker build -t webserver-devopsgol-betahjomblo:1.0 .'

            }

        }

        stage('Docker Push') {

            steps {

                withCredentials([usernamePassword(credentialsId: 'docker_cred', passwordVariable: 'DOCKERHUB_PASSWORD', usernameVariable: 'DOCKERHUB_USERNAME')]) {

                    sh 'sudo docker login -u $DOCKERHUB_USERNAME -p $DOCKERHUB_PASSWORD'

                    sh 'sudo docker tag webserver-devopsgol-betahjomblo:1.0 adinugroho251/webserver-devopsgol-betahjomblo:1.0'

                    sh 'sudo docker push adinugroho251/webserver-devopsgol-betahjomblo:1.0'

                    sh 'sudo docker logout'

                }

            }

        }

      stage('Docker RUN') {

          steps {

           sh 'sudo docker run -d -p 80 --name webserver-betahjombloterus  adinugroho251/webserver-devopsgol-betahjomblo:1.0'

      }

    }

 }

}

    

For detail  projects simple html : https://github.com/devopsgol/apps-html

Add Job in Jenkins  for CI/CD 

Select Restrict where this project can be run  for remote docker host  and input label docker agent ssh. 

Select Source code Manangement  and  input source code project. example for a github.

Checklist  Pool  SCM  for automation deploy using jenkins. When there's a code change from the Source Code Management (SCM) like GitHub or the latest commit changes, Jenkins will trigger to perform the build and deploy.

Select  Build Steps --> Execute Shell 

Certainly! Here's the command to build the container:

imageName=web-devopsgol:${BUILD_NUMBER}

containerName=webserver-betahjombloterus 

sudo docker build -t $imageName .

sudo docker run -p 3000:3000 -d --name $containerName $imageName

Save Configuration  

Click Build Now  for running is job

Logs for job pipelines jenkins

Alhamdulilah container is running and successfuly curl in services application. 

Conlusion