fix: the EnvoyProxy must state its replica count, or the data plane stays down - #40
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…tays down Envoy Gateway reconciles the data plane Deployment's replica count only while the EnvoyProxy names it. Left out, the controller writes the field once when it creates the Deployment and never looks at it again - deliberately, so an HPA can own it - which means a `kubectl scale --replicas=0` is permanent. That is how the shared Gateway on parma went down: the proxy Deployment was scaled to 0 through the Rancher UI on 2026-09-23, the Gateway went Programmed=False with reason NoResources, and nothing was listening on the node's :80/:443 any more, so bonn.eduide.aet.cit.tum.de and mannheim.eduide.aet.cit.tum.de refused connections while every pod in both namespaces stayed healthy. Nothing put it back, and nothing would have. `envoyProxy.replicas` now defaults to 1 and renders into the spec at provider.kubernetes.envoyDeployment.replicas, so the controller owns the field and reverts a manual scale. A spec that sets its own replicas still wins, and `replicas: null` hands the field back to an HPA. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe chart adds an ChangesEnvoyProxy replicas
Priority: ⬆️ High Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to Enabling EnvoyProxy creation without a custom spec can produce a resource that Envoy Gateway rejects, so the replica fix never takes effect. Installations that already autoscale Envoy can have the replica count reset to 1 on older Envoy Gateway versions. Add the provider type to the injected default and document the HPA upgrade path before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Rendered diff across all environmentsNo change to any rendered manifest. For a pure refactor this is the result you want. |
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Inline comments:
In `@charts/eduide-cluster/templates/gateway/envoyproxy.yaml`:
- Around line 11-13: Update the replica-defaulting logic in the Envoy proxy
template to omit envoyDeployment.replicas when
envoyProxy.spec.provider.kubernetes.envoyHpa is configured and the user has not
set replicas. Preserve the existing replica behavior when no HPA is configured
or replicas is explicitly provided.
- Line 12: Add the Kubernetes provider type to the `$default` provider map in
the EnvoyProxy template, so replica defaults produce a valid provider
configuration when `envoyProxy.spec` is empty. Keep the user-supplied spec as
the later merge argument so its `provider.type` takes precedence.
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charts/eduide-cluster/README.mdcharts/eduide-cluster/templates/gateway/envoyproxy.yamlcharts/eduide-cluster/values.yaml
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The default injected `provider.kubernetes` unconditionally, which broke three specs the chart has to leave alone. An empty `envoyProxy.spec` rendered `provider` with no `type`. The CRD marks `type` required as soon as `provider` exists, so `create: true` with default values - valid before this branch, since `spec` itself is optional - produced a resource the API server rejects. The default now carries `type: Kubernetes`, and a spec that names its own type still wins. An `envoyDaemonSet` spec was rejected outright: the CRD's CEL rule permits envoyDeployment or envoyDaemonSet, never both. An `envoyHpa` spec already has an owner for the field, and a `Host` provider has no Deployment at all. All three are now skipped rather than merged into. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
1 participant
What broke
bonn.eduide.aet.cit.tum.deandmannheim.eduide.aet.cit.tum.deon parma refused connections outright - not a 404, not a TLS error, nothing listening on the node's:80/:443.Every pod in
eduide-bonnandeduide-mannheimwas healthy the whole time. What was gone was the data plane:deployment/envoy-eduide-system-theia-shared-gateway-79a356c4inenvoy-gateway-systemsat at0/0, andGateway/theia-shared-gatewayreportedProgrammed=False, reasonNoResources, "Envoy replicas unavailable". That Deployment is what binds the node's public IP, because theEnvoyProxypatches it withhostPort: 80/443and the Service is deliberatelyClusterIP- there is no LoadBalancer in front of it.The Deployment's managed fields name field manager
agentwritingspec.replicasat2026-09-23T11:46:03Z: someone scaled the proxy to zero through the Rancher UI.Why nothing healed it
Envoy Gateway reconciles
spec.replicason the proxy Deployment only while the EnvoyProxy names it. Left unset, the controller writes the field once at creation and then never touches it again - on purpose, so an HPA can own it. The chart passesenvoyProxy.specthrough verbatim, and no cluster setsenvoyDeployment.replicas, so on every EduIDE cluster today onekubectl scale --replicas=0takes the shared Gateway down permanently.The fix
envoyProxy.replicas, defaulting to1, merged into the rendered spec atprovider.kubernetes.envoyDeployment.replicas. The controller then owns the field and reverts a manual scale within a reconcile.Precedence is preserved in both directions:
envoyProxy.specalready setsenvoyDeployment.replicaskeeps its value (mergeOverwriteputs the user's spec on top)envoyProxy.replicas: nullinjects nothing, handing the field back to an HPAVerification
helm templateacross the four shapes:envoyDeployment.replicas: 1added, rest untouchedreplicas: nullenvoyDeploymentkey at allspecsetsreplicas: 33survivescreate: true, nothing elsereplicas: 1Diffing the render of parma's live values before and after this branch gives exactly the two added lines and nothing else.
Also run:
helm lint charts/eduide charts/eduide-cluster(clean),./scripts/render-envs.sh(9 manifest sets, byte-identical tomain),helm-docsfor the README row.One thing this does not cover
scripts/render-envs.shrenderseduide-clusterfromvalues-example.yaml, which leavesenvoyProxy.createatfalse- so the render-diff job never exercises this template, and the full-render diff above is empty for that reason rather than because nothing changed. That is the same blind spot themonitoringblock invalues-example.yamlalready warns about in its own comment. TurningenvoyProxyon in the example would need agatewayClasswith aparametersRefalongside it to stay a coherent worked example, so I left it for a separate change rather than widening this one.Rollout
Live service on parma is already restored by hand (
kubectl scale ... --replicas=1, Gateway back toProgrammed=True, both landing pages 200). The permanent fix lands on parma when itseduide-clusterrelease is upgraded to a chart carrying this commit. Chart version is not bumped here - perAGENTS.mdthat is its own reviewed PR.🤖 Generated with Claude Code
Summary by CodeRabbit
nullto let an HPA manage replicas. An explicitly configured replica count in the proxy specification takes precedence.