sap-jenkins-library/documentation/docs/steps/dockerExecute.md

dockerExecute

Description

Executes a closure inside a docker container with the specified docker image. The workspace is mounted into the docker image. Proxy environment variables defined on the Jenkins machine are also available in the Docker container.

Parameters

parameter	mandatory	default	possible values
script	yes
containerPortMappings	no
dockerEnvVars	no	[:]
dockerImage	no	''
dockerName	no
dockerOptions	no	''
dockerVolumeBind	no	[:]
dockerWorkspace	no
jenkinsKubernetes	no	[jnlpAgent:s4sdk/jenkins-agent-k8s:latest]
sidecarEnvVars	no
sidecarImage	no
sidecarName	no
sidecarOptions	no
sidecarVolumeBind	no
sidecarWorkspace	no

• script defines the global script environment of the Jenkinsfile run. Typically this is passed to this parameter. This allows the function to access the commonPipelineEnvironment for storing the measured duration.
• containerPortMappings: Map which defines per docker image the port mappings, like containerPortMappings: ['selenium/standalone-chrome': [[name: 'selPort', containerPort: 4444, hostPort: 4444]]]
• dockerEnvVars: Environment variables to set in the container, e.g. [http_proxy:'proxy:8080']
• dockerImage: Name of the docker image that should be used. If empty, Docker is not used and the command is executed directly on the Jenkins system.
• dockerName: Kubernetes case: Name of the container launching dockerImage, SideCar: Name of the container in local network
• dockerOptions Docker options to be set when starting the container. It can be a list or a string.
• dockerVolumeBind Volumes that should be mounted into the container.
• dockerWorkspace: only relevant for Kubernetes case: specifies a dedicated user home directory for the container which will be passed as value for environment variable HOME
• sidecarEnvVars defines environment variables for the sidecar container, similar to dockerEnvVars
• sidecarImage: Name of the docker image of the sidecar container. Do not provide this value if no sidecar container is required.
• sidecarName: as dockerName for the sidecar container
• sidecarOptions: as dockerOptions for the sidecar container
• sidecarVolumeBind: as dockerVolumeBind for the sidecar container
• sidecarWorkspace: as dockerWorkspace for the sidecar container

Kubernetes support

If the Jenkins is setup on a Kubernetes cluster, then you can execute the closure inside a container of a pod by setting an environment variable ON_K8S to true. However, it will ignore containerPortMappings, dockerOptions and dockerVolumeBind values.

Step configuration

We recommend to define values of step parameters via config.yml file.

In following sections the configuration is possible:

parameter	general	step	stage
script
containerPortMappings		X	X
dockerEnvVars		X	X
dockerImage		X	X
dockerName		X	X
dockerOptions		X	X
dockerVolumeBind		X	X
dockerWorkspace		X	X
jenkinsKubernetes	X
sidecarEnvVars		X	X
sidecarImage		X	X
sidecarName		X	X
sidecarOptions		X	X
sidecarVolumeBind		X	X
sidecarWorkspace		X	X

Side effects

none

Exceptions

none

Example 1: Run closure inside a docker container

dockerExecute(dockerImage: 'maven:3.5-jdk-7'){
    sh "mvn clean install"
}

Example 2: Run closure inside a container in a kubernetes pod

# set environment variable
export ON_K8S=true"

dockerExecute(script: this, dockerImage: 'maven:3.5-jdk-7'){
    sh "mvn clean install"
}

In the above example, the dockerEcecute step will internally invoke dockerExecuteOnKubernetes step and execute the closure inside a pod.

Example 3: Run closure inside a container which is attached to a sidecar container (as for example used in seleniumExecuteTests

dockerExecute(
        script: script,
        containerPortMappings: [containerPortMappings:'selenium/standalone-chrome':[containerPort: 4444, hostPort: 4444]],
        dockerImage: 'node:8-stretch',
        dockerName: 'node',
        dockerWorkspace: '/home/node',
        sidecarImage: 'selenium/standalone-chrome',
        sidecarName: 'selenium',
) {
    git url: 'https://github.wdf.sap.corp/XXXXX/WebDriverIOTest.git'
    sh '''npm install
          node index.js
    '''
}