Configuration as Code (JCasC) Overview

1. Introduction

Configuration as Code (JCasC) is a Jenkins plugin that allows users to define the configuration of Jenkins using a YAML file. This approach promotes consistency, reproducibility, and easier management of Jenkins configurations.

2. Key Concepts

3. Installation

To use JCasC, install the plugin from the Jenkins Plugin Manager:

1. Navigate to Manage Jenkins.
2. Click on Manage Plugins.
3. In the Available tab, search for Configuration as Code.
4. Select the plugin and click Install without restart.

After installation, configure Jenkins to load the YAML configuration file on startup:

JENKINS_HOME/casc.yaml
# Sample YAML configuration
jenkins:
  systemMessage: "Configured by JCasC"
  numExecutors: 2
            

4. Configuration Example

Below is a simple example of a Jenkins configuration using JCasC:

jenkins:
  securityRealm: 
    local:
      users:
        - id: "admin"
          password: "admin123"
  authorizationStrategy:
    loggedInUsersCanDoAnything:
      allowAnonymousRead: true
            

5. Best Practices

• Use comments in YAML to document your configuration.
• Test configurations in a staging environment before applying them in production.
• Regularly review and update configurations to reflect current needs.

6. FAQ