> ## Documentation Index
> Fetch the complete documentation index at: https://www.towbar.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Jenkins

> Jenkins automates software builds, tests, and delivery pipelines.

export const UseCaseNavigation = () => {
  useLayoutEffect(() => {
    const storageKey = "towbar-use-case-open-groups";
    const groupSelector = "#sidebar li[data-title] > button[aria-expanded]";
    let restoring = false;
    let frame = 0;
    function storedGroups() {
      try {
        return new Set(JSON.parse(sessionStorage.getItem(storageKey) || "[]"));
      } catch {
        return new Set();
      }
    }
    function save(groups) {
      try {
        sessionStorage.setItem(storageKey, JSON.stringify([...groups]));
      } catch {}
    }
    function groupName(button) {
      return button.parentElement?.dataset.title;
    }
    function rememberOpenGroups() {
      const groups = new Set();
      for (const button of document.querySelectorAll(groupSelector)) {
        if (button.getAttribute("aria-expanded") === "true") {
          const name = groupName(button);
          if (name) groups.add(name);
        }
      }
      save(groups);
    }
    function restoreOpenGroups() {
      frame = 0;
      const groups = storedGroups();
      if (!groups.size) return;
      restoring = true;
      for (const button of document.querySelectorAll(groupSelector)) {
        if (groups.has(groupName(button)) && button.getAttribute("aria-expanded") === "false") {
          button.click();
        }
      }
      restoring = false;
    }
    function scheduleRestore() {
      if (!frame) frame = requestAnimationFrame(restoreOpenGroups);
    }
    function onClick(event) {
      if (restoring || !(event.target instanceof Element)) return;
      const button = event.target.closest(groupSelector);
      if (button) {
        const name = groupName(button);
        if (!name) return;
        const groups = storedGroups();
        if (button.getAttribute("aria-expanded") === "true") groups.delete(name); else groups.add(name);
        save(groups);
        return;
      }
      if (event.target.closest('a[href^="/docs/use-cases/"]')) {
        rememberOpenGroups();
      }
    }
    const observer = new MutationObserver(scheduleRestore);
    document.addEventListener("click", onClick, true);
    observer.observe(document.getElementById("sidebar") || document.body, {
      childList: true,
      subtree: true
    });
    scheduleRestore();
    return () => {
      document.removeEventListener("click", onClick, true);
      observer.disconnect();
      cancelAnimationFrame(frame);
    };
  }, []);
  return null;
};

<UseCaseNavigation />

<img className="towbar-doc-brand-logo" src="https://mintcdn.com/avgeek/EGkEWLTQnOwecqNx/assets/use-case-logos/jenkins.svg?fit=max&auto=format&n=EGkEWLTQnOwecqNx&q=85&s=5dcfb814c19055d73476bde1807de430" alt="Jenkins logo" aria-hidden="true" width="24" height="24" data-path="assets/use-case-logos/jenkins.svg" />

**Upstream source:** [Current installation guide](https://www.jenkins.io/doc/book/installing/docker/).

Jenkins keeps jobs, plugins, and credentials in `/var/jenkins_home`. The controller is not a Docker build worker; add dedicated agents instead of mounting the host Docker socket.

## Towbar manifest

```yaml title=".towbar/services/jenkins.service.yml" theme={"system"}
id: jenkins
name: Jenkins
buildServer: null
deployment:
  type: image
  image: jenkins/jenkins:2.528.1-lts-jdk21
container:
  port: 8080
  volumes:
    - name: jenkins_home
      mountPath: /var/jenkins_home
      initialData: image
environments:
  production:
    server: 192.0.2.10
rollout:
  type: recreate
  maintenanceMode: true
  reason: Persistent application data uses a single writer
domains:
  primary: jenkins.example.com
tls:
  mode: direct
```

## Configure

1. Prepare the example server, connect the repository, and map `production` to the branch containing these manifests. Replace the example server IP and domain. Commit the manifests, then sync the repository and inspect the resolved configuration.
2. Keep the Service's named volumes attached across deployments. Towbar's Datastore backup policy does not back up Service volumes, so include them in your own recovery plan.
3. Deploy the Service, then perform the checks below before enabling auto-deploy.

## Verify

Complete the unlock wizard, create a small job, and verify it remains after redeployment. Back up Jenkins home before upgrades.

For field constraints, see [Service manifest](/docs/services/manifest).