Jenkins uses a pluggable architecture to provide most of its functionality. JCasC makes use of the Configuration as Code plugin, which allows you to define the desired state of your Jenkins configuration as one or more YAML file(s), eliminating the ne
Jenkins is one of the most popular open-source automation servers, often used to orchestrate continuous integration (CI) and/or continuous deployment (CD) workflows.
Configuring Jenkins is typically done manually through a web-based setup wizard; this can be a slow, error-prone, and non-scalable process. You can see the steps involved by following Step 4 — Setting Up Jenkins of the How To Install Jenkins on Ubuntu 18.04 guide. Furthermore, configurations cannot be tracked in a version control system (VCS) like Git, nor be under the scrutiny of any code review process.
Jenkins uses a pluggable architecture to provide most of its functionality. JCasC makes use of the Configuration as Code plugin, which allows you to define the desired state of your Jenkins configuration as one or more YAML file(s), eliminating the need for the setup wizard. On initialization, the Configuration as Code plugin would configure Jenkins according to the configuration file(s), greatly reducing the configuration time and eliminating human errors.
Docker is the de facto standard for creating and running containers, which is a virtualization technology that allows you to run isolated, self-contained applications consistently across different operation systems (OSes) and hardware architectures. You will run your Jenkins instance using Docker to take advantage of this consistency and cross-platform capability.
This tutorial starts by guiding you through setting up JCasC. You will then incrementally add to the JCasC configuration file to set up users, configuration authentication and authorization, and finally to secure your Jenkins instance. After you’ve completed this tutorial, you’ll have created a custom Docker image that is set up to use the Configuration as Code plugin on startup to automatically configure and secure your Jenkins instance.
To complete this tutorial, you will need:
Note: This tutorial is tested on Ubuntu 18.04; however, because Docker images are self-contained, the steps outlined here would work for any OSes with Docker installed.
Using JCasC eliminates the need to show the setup wizard; therefore, in this first step, you’ll create a modified version of the official
[jenkins/jenkins](https://hub.docker.com/r/jenkins/jenkins/) image that has the setup wizard disabled. You will do this by creating a
Dockerfile and building a custom Jenkins image from it.
jenkins/jenkins image allows you to enable or disable the setup wizard by passing in a system property named
jenkins.install.runSetupWizard via the
JAVA_OPTS environment variable. Users of the image can pass in the
JAVA_OPTS environment variable at runtime using the
[--env](https://docs.docker.com/engine/reference/commandline/run/#set-environment-variables--e---env---env-file) flag to
docker run. However, this approach would put the onus of disabling the setup wizard on the user of the image. Instead, you should disable the setup wizard at build time, so that the setup wizard is disabled by default.
You can achieve this by creating a
Dockerfile and using the
[ENV](https://docs.docker.com/engine/reference/builder/#env) instruction to set the
JAVA_OPTS environment variable.
First, create a new directory inside your server to store the files you will be creating in this tutorial:
mkdir -p $HOME/playground/jcasc
Then, navigate inside that directory:
Next, using your editor, create a new file named
Then, copy the following content into the
FROM jenkins/jenkins:latest ENV JAVA_OPTS -Djenkins.install.runSetupWizard=false
Here, you’re using the
[FROM](https://docs.docker.com/engine/reference/builder/#from) instruction to specify
jenkins/jenkins:latest as the base image, and the
ENV instruction to set the
JAVA_OPTS environment variable.
Save the file and exit the editor by pressing
CTRL+X followed by
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