docker-minecraft-server/jenkins

A self-upgrading Jenkins CI server

Basic Usage

To start Jenkins with the latest version:

ID=$(docker run -d -p 8080:8080 itzg/jenkins)

At a later time, you can upgrade by restarting the container:

docker stop $ID
docker start $ID

Attaching host directory to Jenkins home directory

The Jenkins home directory is attachable at /data, so attaching to a host volume would be:

ID=$(docker run -d -p 8080:8080 -v /SOME_HOST_DIR:/data itzg/jenkins

Enabling Jenkins slave agents

By default, Jenkins will pick a random port to allow slave nodes launched by JNLP. Since Docker networking is basically a firewall, a random port won't work for us. Instead the fixed port 38252 was chosen (arbitrarily) to be exposed by the container.

Launch your Jenkins container using

ID=$(docker run -d -p 8080:8080 -p 38252:38252 itzg/jenkins)

and configure the port in the Global Security settings:

Image Parameters

Volumes

• /data - a majority of the Jenkins content is maintained here, such as workspaces
• /root - some tools, such as Maven, utilize the home directory for default repository storage
• /opt/jenkins - the installed distribution is expanded here

Ports

• 8080 - for the web UI
• 38252 - for slave incoming JMX access

Environment Variables

• JENKINS_OPTS - passed to the initial Java invocation of Jenkins