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Chapter 32: Jenkins Governance, Troubleshooting and Expert Projects: Cards

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Revision cards

Governance: the scan is not optional. If each team decides, some will skip scans when in a hurry.
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Lesson: 32.1 Governance: the scan is not optional

Jenkins will not start. When Jenkins is down, no one can build or deploy.
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Lesson: 32.2 Will not start

Disk full. A full disk stops builds and can corrupt Jenkins files.
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Lesson: 32.3 Disk full

Agent offline. Builds wait in the queue forever when their agents are offline.
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Lesson: 32.4 Agent offline

Git authentication failures. A broken Git login stops every build of that repo.
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Lesson: 32.5 Git auth

Queue stuck. Builds that never start look like a broken Jenkins.
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Lesson: 32.6 Queue stuck

Expert projects: a checklist. Interviews for senior roles ask what you built, not what you read.
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Lesson: 32.7 Expert projects — a checklist, not ten courses

Interview cards

How do you make sure every team runs security scans? Put required scan stages in a shared library step every pipeline must call, with gates teams can't skip.
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Lesson: 32.1 Governance: the scan is not optional

Jenkins won't start. What do you check? The service log first, then Java version, port 8080, disk space, and the last plugin change.
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Lesson: 32.2 Will not start

Jenkins disk is full. What do you do? Free space now (old builds, workspaces, Docker images), then prevent it with buildDiscarder and alerts.
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Lesson: 32.3 Disk full

An agent is offline. How do you debug? Read the agent log on its node page, check network or SSH, disk, Java, then relaunch.
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Lesson: 32.4 Agent offline

Builds fail with “Permission denied (publickey)”. Why? Jenkins' SSH key isn't accepted: wrong key, not added on the Git host, or wrong credential ID in the job.
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Lesson: 32.5 Git auth

Builds stay in the queue. What do you check? Hover the queued item: no executor, no node with label, or blocked by another build.
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Lesson: 32.6 Queue stuck

What would you show as a senior Jenkins project? A pipeline as code with a shared library, security gates, deploy with approval and rollback, JCasC, and a tested restore.
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Lesson: 32.7 Expert projects — a checklist, not ten courses

Comparison cards

Service log vs build console log. Service log: Jenkins' own log (journalctl).Console log: output of one build.
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Lesson: 32.2 Will not start

buildDiscarder vs workspace cleanup. buildDiscarder: deletes old build records and artifacts.Workspace cleanup: deletes checked-out files.
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Lesson: 32.3 Disk full

Stuck queue vs offline agent. Stuck queue: builds waiting to start.Offline agent: a machine not connected.
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Lesson: 32.6 Queue stuck