fix(base-cluster/monitoring): lock down kdave container#1646
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cwrau
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marvinWolff,
tasches and
teutonet-bot
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WalkthroughThe kdave HelmRelease manifest in the monitoring namespace was updated to enforce stricter security settings. A kustomize postRenderer injects a securityContext into the Deployment's first container, specifying non-root execution, UID/GID 1003, restricted capabilities, and seccomp profile. The Helm values also add a top-level securityContext configuration. Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~7 minutes Poem
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Pull Request Overview
This PR enhances the security posture of the kdave monitoring component by implementing container security hardening measures. The changes enforce non-root execution, restrict capabilities, and enable security profiles to reduce attack surface.
- Added comprehensive security context configuration for kdave containers
- Implemented JSON patch to enforce security settings at runtime
- Applied principle of least privilege through capability dropping and privilege escalation prevention
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Actionable comments posted: 1
🧹 Nitpick comments (1)
charts/base-cluster/templates/monitoring/kdave/kdave.yaml (1)
50-53: Duplicate / partially-overlapping securityContext between values and postRenderer
values.securityContextsetsrunAsNonRootand a pod-levelseccompProfile, while the postRenderer injects a fuller container-level context.
Maintaining both increases cognitive load and can lead to drift (e.g. UID/GID only in the JSON patch).If the upstream chart already respects
values.securityContext, prefer consolidating everything there and dropping the postRenderer.
If the postRenderer is required (e.g. chart ignores the field), document that in a code comment and consider at least mirroringrunAsUser/runAsGrouphere for consistency.
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📒 Files selected for processing (1)
charts/base-cluster/templates/monitoring/kdave/kdave.yaml(2 hunks)
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🧠 Learnings (2)
📓 Common learnings
Learnt from: cwrau
PR: teutonet/teutonet-helm-charts#1604
File: charts/base-cluster/templates/monitoring/metrics-server/metrics-server.yaml:20-21
Timestamp: 2025-07-24T09:41:28.072Z
Learning: The official kubernetes-sigs/metrics-server Helm chart pins the image tag to a specific version in its values.yaml by default, ensuring reproducible deployments without requiring explicit tag specification in consuming charts.
Learnt from: cwrau
PR: teutonet/teutonet-helm-charts#1601
File: charts/base-cluster/templates/dns/external-dns.yaml:33-39
Timestamp: 2025-07-24T09:56:41.380Z
Learning: In the teutonet-helm-charts base-cluster chart, secret names like "external-dns" for Cloudflare provider are intentionally hard-coded. Users who need custom secret names should use Helm's `valuesFrom` feature to override values rather than expecting dedicated fields in values.yaml. This design keeps the values.yaml clean while still allowing full customization flexibility.
📚 Learning: in the teutonet-helm-charts base-cluster chart, secret names like "external-dns" for cloudflare prov...
Learnt from: cwrau
PR: teutonet/teutonet-helm-charts#1601
File: charts/base-cluster/templates/dns/external-dns.yaml:33-39
Timestamp: 2025-07-24T09:56:41.380Z
Learning: In the teutonet-helm-charts base-cluster chart, secret names like "external-dns" for Cloudflare provider are intentionally hard-coded. Users who need custom secret names should use Helm's `valuesFrom` feature to override values rather than expecting dedicated fields in values.yaml. This design keeps the values.yaml clean while still allowing full customization flexibility.
Applied to files:
charts/base-cluster/templates/monitoring/kdave/kdave.yaml
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- GitHub Check: check licenses
- GitHub Check: lint helm chart (base-cluster)
🤖 I have created a release *beep* *boop* --- ## [9.1.1](base-cluster-v9.1.0...base-cluster-v9.1.1) (2025-08-01) ### Bug Fixes * **base-cluster/monitoring:** lock down kdave container ([#1646](#1646)) ([431548d](431548d)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Bug Fixes** * Improved security in the base-cluster monitoring component by locking down the kdave container. * **Documentation** * Updated the changelog and README to reflect version 9.1.1 and document the latest bug fix. * **Chores** * Bumped the base-cluster chart version to 9.1.1 across all relevant files. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
Summary by CodeRabbit
New Features
Chores