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CloudBees Core Managed Master for Field Led Workshops

Custom Managed Master Container (Docker) Image

This repository provides an example for creating a custom container (Docker) image to use as a Managed Master Docker image template to be provisioned by CloudBees Core Operations Center running on Kubernetes.

The image is configured to skip the Jenkins 2 Setup Wizard, install all of the CloudBees recommended plugins (minus a few) and some additional plugins typically used by CloudBees SAs for demos and workshops, and auto-configure the Jenkins instances. This config-as-code results in a streamlined CloudBees Core Managed Master provisioning process.

Config-as-Code and GitOps for CloudBees Core Managed Masters

This project uses the original install-plugins.sh, that has been part of the OSS Jenkins Docker image since 2014, for plugin-management-as-code. This is combined with a mix of JCasC and Jenkins Groovy init scripts to manage all Jenkins configuration as code.

JCasC (Jenkins Configuration as Code)

The Jenkins JCasC plugin provides CasC stored as a yaml file. Not all configurations are currently supported by the JCasC plugin - Groovy init scripts are used when there is not support with JCasC - see below for some examples.

The JCasC yaml for CloudBees Field Workshop Managed Masters is managed as part of the JCasC configuration for the Field Workshop CloudBees Operations Center. The reason for this is to make it easier for individual Managed Masters to use different JCasC configuration. An example of overriding

Dockerfile

  • The Dockerfile starts with a FROM value of the CloudBees Core Managed Master Docker image: cloudbees/cloudbees-core-mm.
  • The RUN /usr/local/bin/install-plugins.sh $(cat plugins.txt) command installs all the plugins.
  • The config-as-code.yml file provides Configuration-as-Code via the Jenkins CasC plugin.
  • The quickstart scripts further modifies the Managed Master configuration using init.groovy.d scripts for configuration not currently supported by the CasC plugin.

Proxy Support for Installing Plugins via install-plugins.sh

Customize the Docker file to add the proxy environment values.

Add the following ARGs and ENVs to your Dockerfile:

ARG http_proxy
ARG https_proxy
ARG no_proxy
ENV http_proxy=$http_proxy
ENV https_proxy=$https_proxy
ENV no_proxy=$no_proxy

Pass them into the build like this:

docker build --build-arg http_proxy --build-arg https_proxy --build-arg no_proxy -t cb-core-mm-master .

This will allow automatically picking up the proxy values set in your environment.

Plugins installed:

See the plugins.txt file to see all the plugins that get installed - some non-CJE standard plugins highlights include:

Note, the install-plugins.sh script will download the specified plugins and their dependencies at build time and include them in the image; it also inspects the Jenkins WAR and skips any plugins already included by CloudBees (embedded in the WAR).