Bootstrap Jenkins global configuration from a version-controlled Configuration as Code (JCasC) YAML file
domain: www.jenkins.io · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Install the Configuration as Code plugin on the Jenkins controller.
Author a YAML file (e.g. jenkins.yaml) describing controller settings under top-level keys such as jenkins:, the security realm, credentials, and tool configuration.
Set the CASC_JENKINS_CONFIG environment variable (or the casc.jenkins.config Java system property) to the path of the YAML file, or to a directory of .yaml/.yml files that get merged.
Restart Jenkins, or use Manage Jenkins > Configuration as Code > Reload existing configuration to apply the YAML without a full restart, where supported.
Store the YAML file in source control, referencing secrets indirectly (e.g. via a credentials provider or environment variable substitution) rather than embedding them in plaintext.
Known gotchas
If CASC_JENKINS_CONFIG isn't set, JCasC silently falls back to looking for a single jenkins.yaml in $JENKINS_HOME — a missing env var looks like 'JCasC isn't working' rather than producing a clear error.
Pointing CASC_JENKINS_CONFIG at a directory recursively merges every .yaml/.yml file found there; conflicting keys across files only surface as merge errors at reload/startup time.
JCasC controls controller/global configuration, not general job definitions — job DSL or pipeline-as-code is a separate mechanism, though JCasC can bootstrap seed jobs via its own jobs: block.
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