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feat(helm): support dnsConfig on the forwarder deployment - #2124
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WalkthroughA shared Helm helper now renders validated DNS settings. The runner and forwarder use the helper. Kubewatch receives disabled DNS defaults with ChangesHelm DNS configuration
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Feature Suggested reviewers: Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation |
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| Title check |  |
The title clearly and concisely identifies the main change: adding dnsConfig support to the forwarder Helm deployment. |
| Description check | |
The description accurately explains the shared DNS helper, forwarder support, runner refactoring, configuration defaults, validation, and verification steps. |
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Inline comments:
In `@helm/robusta/templates/_helpers.tpl`:
- Around line 21-26: Update the dnsConfig validation around .enabled to tolerate
a null or missing configuration object and use the established default for
.policy when it is absent. For an effective policy of None, require .nameservers
to exist and be non-empty; do not accept only .searches or .options. Render
dnsPolicy using the resolved fallback policy so the template never emits an
empty value or panics.
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📒 Files selected for processing (4)
helm/robusta/templates/_helpers.tplhelm/robusta/templates/forwarder.yamlhelm/robusta/templates/runner.yamlhelm/robusta/values.yaml
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@arikalon1 ping |
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The runner Deployment already supported a configurable dnsPolicy / dnsConfig, but the forwarder (kubewatch) did not and was stuck on the implicit ClusterFirst policy. Extract the runner's inline dnsConfig logic into a shared `robusta.dnsConfig` helper (including the "None requires config" guard and the ClusterFirst fallback) and use it from both the runner and the forwarder. Add a matching `kubewatch.dnsConfig` block to values.yaml. Defaults are unchanged: dnsConfig.enabled is false, so both deployments still render `dnsPolicy: ClusterFirst`. The runner's rendered output is byte-for-byte identical. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Address CodeRabbit feedback on the dnsConfig helper: - When dnsPolicy is "None", Kubernetes requires at least one nameserver (searches/options alone are rejected by the API server). Tighten the guard to require .nameservers specifically instead of any config field. - Tolerate a null/missing dnsConfig object (`and . .enabled`) and default .policy to "ClusterFirst" when unset, so the template never panics or emits an empty `dnsPolicy: ""`. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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arikalon1
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What
The runner Deployment already supports a configurable
dnsPolicy/dnsConfig(runner.dnsConfig.*), but the forwarder (kubewatch) does not — it's stuck on the implicitClusterFirstpolicy.This PR extracts the runner's inline dnsConfig logic into a shared
robusta.dnsConfighelper and uses it from both the runner and the forwarder, and adds a matchingkubewatch.dnsConfigblock tovalues.yaml.Why
Users who need custom DNS (e.g.
dnsPolicy: Nonewith explicit nameservers/searches, or customndotsoptions) can already configure it for the runner but had no way to do the same for the forwarder pod.Details
robusta.dnsConfighelper in_helpers.tpl— centralizes thednsPolicy, the optionaldnsConfigblock, the "Nonerequires at least one of nameservers/searches/options" guard, and theClusterFirstfallback.runner.yamlnow calls the helper (removes ~26 lines of inline logic).forwarder.yamlcalls the same helper beforecontainers:.values.yamlgains akubewatch.dnsConfigblock mirroringrunner.dnsConfig.Backwards compatibility
Defaults are unchanged (
dnsConfig.enabled: false), so both deployments still renderdnsPolicy: ClusterFirst. The runner's rendered output is byte-for-byte identical.Verified with
helm template:dnsPolicy: ClusterFirston both deploymentsenabled: true+policy: None+ nameservers → correctdnsConfignestingpolicy: Nonewith no config → still hard-fails via the guard🤖 Generated with Claude Code