Com.palantir.docker

External

• https://github.com/palantir/gradle-docker

Internal

• Gradle Plugins

Latest Version

https://plugins.gradle.org/m2/com/palantir/docker/com.palantir.docker.gradle.plugin/

Example

buildscript {

    ext {

        ...
        dockerGradleVersion = '0.21.0'
    }

    repositories {

        mavenCentral()

        maven {
            
            url "https://plugins.gradle.org/m2/"
        }
    }
    dependencies {
        ...
        classpath("gradle.plugin.com.palantir.gradle.docker:gradle-docker:${dockerGradleVersion}")
    }
}

ext {
    
    dockerNamespace = "com.example/playground"
}

...

apply plugin: 'com.palantir.docker'

...

docker {
    
  dependsOn build

  // bootJar.baseName resolves to the artifact name, without version and extension information
  name "${dockerNamespace}/${bootJar.baseName}"

  dockerfile file('Dockerfile')

  // bootJar.archivePath resolves to the absolute path of the artifact file
  files bootJar.archivePath

  // bootJar.archiveName resolves to the artifact name, including version and extension
  buildArgs(['JAR_FILE': "${bootJar.archiveName}"])
}

The corresponding Dockerfile:

FROM openjdk:8-jdk-alpine
ARG JAR_FILE
COPY ${JAR_FILE} app.jar
RUN apk --no-cache add curl bash bind-tools
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

Configuration

The plugin configuration is applied in a docker {} script block. The following parameters are available:

name

The container name. Includes the namespace and may include a tag. Example:

docker {
  ...
  name com.example/my-container:latest
  ...
}

name the name to use for this container, may include a tag

dockerfile

The dockerfile to use for building the image. It defaults to project.file('Dockerfile') and must be a file object.

docker {
  ...
  dockerfile file('Dockerfile')
  ...
}

files

An argument list of files to be included in the Docker build context.

buildArgs

An argument map of string-to-string which will set --build-arg arguments to the docker build command and pass Docker build-time variables. It defaults to empty, which results in no --build-arg parameters.

Single argument:

docker {
  ...
  buildArgs(['DISTRIBUTION_FILE': distribution.name])
}

Multiple arguments:

docker {
  ...
  buildArgs(['DISTRIBUTION_FILE': distribution.name, 'DISTRIBUTION_IMAGE_DIR': distributionImageDir])
}

The arguments passed as such can then be used in the Dockerfile as follows:

...
ARG DISTRIBUTION_FILE
ARG DISTRIBUTION_IMAGE_DIR
COPY ${DISTRIBUTION_FILE} ${DISTRIBUTION_IMAGE_DIR}/${DISTRIBUTION_FILE}
...

More details about Docker build-time variables:

Docker Build-Time Variables

Execution Internals

The build context is a local directory similar to /var/lib/docker/tmp/docker-builder036476946.