Jenkins Declarative Pipeline with Docker

Use your Docker Build and Run Knowledge

docker build - you can use sh 'docker build . -t <tag>' in your pipeline stage block to run the docker build command. (Make sure you have docker installed with correct permissions.

docker run: you can use sh 'docker run -d <image>' in your pipeline stage block to build the container.

How will the stages look

stages {
        stage('Build') {
            steps {
                sh 'docker build -t trainwithshubham/django-app:latest'
            }
        }
    }

Task-01

• Create a docker-integrated Jenkins declarative pipeline.

• Use the above-given syntax using sh inside the stage block

• You will face errors in case of running a job twice, as the docker container will be already created, so for that do task 2

Step 1--> In Jenkins, to create a new pipeline job, click on "New Item" in the Jenkins dashboard, then select "Pipeline" as the project type.

Step 2--> After clicking "OK," you can provide a description for the new pipeline job.

Step 3--> In the configuration of the pipeline job, navigate to the "Pipeline Script" section and define your stages, steps, and parameters accordingly.

pipeline {
    agent any
    stages{
        stage ('Code Clone') {
            steps {
                git url : 'https://github.com/ArnavS1999/django-todo-cicd.git' , branch : 'develop'
            }
        }
        stage ('Build') {
            steps {
                sh 'docker build . -t  django-todo-cicd:latest'
            }
        }
        stage ('Testing') {
            steps {
                echo 'testing'
            }
        }
        stage ('Deploy') {
            steps {
                sh 'docker run -d -p 8000:8000 django-todo-cicd:latest'
            }
        }
    }
}

Inside the stages block:

• The Code Clone stage uses the git step to clone the code from the specified GitHub repository (https://github.com/ArnavS1999/django-todo-cicd.git) and the develop branch.

• The Build stage uses the sh step to build a Docker image named django-todo-cicd:latest using the current directory (.).

• The Deploy stage uses the sh step to run the django-todo-cicd:latest Docker container in detached mode (-d) and maps port 8000 on the host to port 8000 in the container.

Step 4--> "Save" and click on "Build Now" to start the pipeline.

Step 5--> Console Output.

Step 6--> Verify whether we can browse the application or not.

Step 7--> We will face errors in case of running a job twice, as the docker container is already created, so for that do task 2.

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Task-02

• Create a docker-integrated Jenkins declarative pipeline using the docker groovy syntax inside the stage block.

• Complete your previous projects using this Declarative pipeline approach.

Step 1--> We can address the error by utilizing docker-compose and modify the script to incorporate the docker-compose down and docker-compose up commands.

Step 2--> Click on "Save" and then click on "Build Now".

Step 3--> Once the build is successful, check whether our application is working or not.

This approach helps manage containers more effectively, ensuring a clean environment before deployment and minimizing potential conflicts.

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Thank you for reading. I hope you were able to understand and learn something new from my blog.

Happy Learning!

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