AI / RenovateBot Interview Questions

How does Renovate update Docker image versions in Dockerfiles?

Renovate's dockerfile manager extracts FROM image references and raises PRs when newer tags are available. It supports both tag-based and digest-based pinning.

# Dockerfile â Renovate parses FROM lines
FROM node:20.11.0-alpine3.19
# â PR to update to node:20.12.0-alpine3.19

# Digest pinning (immutable)
FROM node:20@sha256:a1b2c3d4...  # Renovate updates digest when node:20 changes

{
  "packageRules": [
    {
      "matchManagers": ["dockerfile"],
      "matchPackageNames": ["node"],
      "allowedVersions": "20",
      "matchUpdateTypes": ["minor", "patch"],
      "automerge": true
    }
  ],
  "digest": {
    "enabled": true,
    "automerge": true
  }
}

Take quiz

What is the benefit of using digest-pinned Docker images with Renovate?Digest pinning makes Docker builds faster

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Digests are immutable — image content cannot change unexpectedly; Renovate updates the digest when the tag points to new content, giving both reproducibility and automated freshness

✓ Correct! Well done.

Digest pinning disables Renovate's ability to detect updates

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Digest-pinned images are automatically automerged

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How do you restrict Renovate to only raise PRs for Node.js patch and minor updates within the Node 20 LTS line?Set "allowedVersions": "20" and "matchUpdateTypes": ["minor","patch"] in a packageRule targeting node

✓ Correct! Well done.

Set "pinDigests": true in the dockerfile manager config

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Set "ignoreDeps": ["node"] and manually specify allowed versions

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Use "matchCurrentVersion": ">=20.0.0 <21.0.0" with no other restrictions

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AI / RenovateBot Interview Questions

How does Renovate update Docker image versions in Dockerfiles?

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