Building Docker images with Jenkins involves several steps:
1. Install Docker on your Jenkins machine: Before you can use Docker in your Jenkins pipelines, ensure that Docker is installed on the machine running Jenkins.
1. Install Docker plugins: Jenkins provides Docker related plugins, such as Docker Pipeline plugin, Docker Commons plugin, and Docker Build and Publish plugin. These plugins help to build, publish, and use Docker images in your Jenkins pipelines.
1. Use Docker in your Jenkinsfile: After installing the plugins, you can now use Docker in your Jenkinsfile, which is the file that contains the definition of your Jenkins Pipeline.
Here is a simple example of how to build Docker images in a Jenkinsfile:
```
node {
stage(‘Build Docker Image’) {
checkout scm
docker.withRegistry(‘https://registry.hub.docker.com’, ‘docker-hub-credentials’) {
def app = docker.build(“my-image:${env.BUILD_ID}”)
}
}
This Jenkinsfile will checkout your code, build a Docker image with the name “my-image”, and tag it with the ID of the current build. It will then push this image to Docker Hub. The `docker.withRegistry` method is used to provide the URL and credentials of your Docker registry.
Remember to replace ‘https://registry.hub.docker.com’ with your Docker registry URL and ‘docker-hub-credentials’ with your Jenkins credentials for the Docker registry. If you’re using Docker Hub, the URL is ‘https://registry.hub.docker.com’.
1. Run your pipeline: After setting up your Jenkinsfile, you can now run your Jenkins pipeline. The pipeline will build and push your Docker image as defined in the Jenkinsfile.
Please make sure you have Dockerfile in your source code as well.
Reference: https://www.jenkins.io/doc/book/pipeline/docker/
