CODEWITHSUNDEEP
dockerjenkinsjenkins-pipeline
Stephan
Stephan

Reputation: 528

Jenkins/Docker: How to force pull base image before build

Docker allows passing the --pull flag to docker build, e.g. docker build --pull -t myimage .. How can I enforce pulling the base image with a pipeline script in my Jenkinsfile? This way I want to ensure that the build always uses the latest container image despite of the version available locally.

node('docker') {
    def app

    stage('Checkout') {
        checkout scm
    }

    stage('Build image') {
        docker.withRegistry('https://myregistry.company.com', 'dcr-jenkins') {
            app = docker.build "myimage"
        }
    }

    stage('Publish image') {
        docker.withRegistry('https://myregistry.company.com', 'dcr-jenkins') {
            app.push("latest")
        }
    }
}

Upvotes: 7

Views: 14234

Answers (3)

Evan Borgstrom
Evan Borgstrom

Reputation: 627

The most straight-forward answer is to use the second argument to docker.build

stage('Build image') {
    docker.withRegistry('https://myregistry.company.com', 'dcr-jenkins') {
        app = docker.build("myimage", "--pull .")
    }
}

If you don't supply it then it just defaults to ., so if you pass in anything you must also include the context yourself.

You can find this in the "Pipeline Syntax - Global Variable Reference". Just add /pipeline-syntax/globals to the end of any Jenkins URL (i.e. http://localhost:8080/job/myjob/pipeline-syntax/globals)

Upvotes: 11

Stephan
Stephan

Reputation: 528

additionalBuildArgs does the job.

Example:

pipeline {
    agent {
        label "docker"
    }

    stages {
        […]

        stage('Build image') {
            agent {
                dockerfile {
                    reuseNode true
                    registryUrl "https://registry.comapny.com"
                    registryCredentialsId "dcr-jenkins"
                    additionalBuildArgs "--pull --build-arg APP_VERSION=${params.APP_VERSION}"
                    dir "installation/app"
                }
            }

            steps {
                script {
                    docker {
                        app = docker.build "company/app"
                    }
                }
            }
        }

        […]
    }

}

Upvotes: 5

bluescores
bluescores

Reputation: 4677

docker rmi <image> at the beginning of your script, before docker build --pull. The image will not exist locally when docker build --pull executes, so it will be downloaded fresh each time.

Upvotes: 0

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