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docs: the eduide cluster is provisioned, and it has no load balancer - #139
Follow-up to the bonn/mannheim outage on parma. The chart-side fix is EduIDE-Helm#40; this is the documentation half.
The drift was not where I first said it was
clusters/eduide.yaml describes parma correctly - #125 corrected it when the cluster came up. I verified every field against the live cluster rather than taking it on trust:
manifest
live
storageClassName: local-path
only class on the node, marked default; every EduIDE PVC uses it
gatewayClassName: eduide
GatewayClass/eduide
acmeEmail: admin.aet@xcit.tum.de
ClusterIssuer/letsencrypt-prod-gateway, same address
What had gone stale is the prose around it. Three places still said the cluster does not exist:
README.md - "The eduide cluster is not provisioned yet."
AGENTS.md - same claim, which is what every agent reads first
docs/environments.md - "Not provisioned yet.", plus a paragraph about the two environments existing before their cluster
The gap that matters more
docs/cluster-setup.md opens by warning that two of its manual steps "produce a cluster that reports itself healthy and serves nothing", and step 2 - deciding which address serves EduIDE - is the one it calls out as most dangerous. It offered exactly two answers, (a) join the merged gateway and (b) your own GatewayClass pinned to a MetalLB pool. Both assume a load balancer exists.
parma has none. k3s runs there without servicelb and there is no MetalLB, so a LoadBalancer Service sits Pending for ever. The one cluster of ours that this page's most dangerous step actually applies to had no option describing it.
Option (c) is now written down: envoyService.type: ClusterIP plus a StrategicMerge patch giving the Envoy container hostPort: 80/443, and the hostNetwork dead end clusters/eduide.yaml records - Envoy runs as non-root, Kubernetes cannot grant NET_BIND_SERVICE effectively, so every listener fails cannot bind '0.0.0.0:80': Permission denied while the pod reports Running.
The same step now also says to state the data plane's replica count, since omitting it is precisely what took both installations down on 2026-09-23.
The replica pin, and why I changed my mind
An earlier revision of this description said envoyDeployment.replicas was deliberately left out of clusters/eduide.yaml, on the grounds that EduIDE-Helm#40 defaults it in the chart. That reasoning was wrong, and review caught it.
No released chart defaults it - #40 is still in review. So the guide told readers to state a replica count, pointed at clusters/eduide.yaml as the worked example, and that manifest did not state one; parma stayed one scale-to-zero away from repeating the outage this PR documents. The manifest now pins replicas: 1 with the reason in a comment.
This is not a duplicate source of truth once #40 lands: a cluster spec that names its own replicas wins over the chart default by design, which is the same precedence an HPA-driven cluster relies on.
Checks
./scripts/check-agents-md.sh (5 referenced paths check out), ./scripts/test-deploy-logic.sh (ALL PASS), and all three cluster manifests validate against schemas/cluster.schema.json.
Reviewing files that changed from the base of the PR and between 89c7719 and 69fbd65.
📒 Files selected for processing (3)
clusters/eduide.yaml
docs/cluster-setup.md
docs/envoy-gateway-setup.md
📝 Walkthrough
Walkthrough
The documentation identifies eduide as a provisioned single-node k3s cluster with no load balancer. The cluster setup guide adds instructions for using the node address and hostPort, and updates bootstrap configuration and Envoy replica guidance.
Changes
EduIDE cluster documentation
Layer / File(s)
Summary
Cluster status AGENTS.md, README.md, docs/environments.md
These references identify eduide as a provisioned single-node k3s cluster with no load balancer. They describe its use of hostPort for Envoy traffic and retain deployment requirements for the cluster identity check and KUBECONFIG.
Cluster setup guidance docs/cluster-setup.md
The guide covers setup for clusters without a load balancer, including node address selection, hostPort configuration, bootstrap settings, and the Envoy data plane replica count.
Operators following this guide could validate the wrong cluster or bootstrap a GatewayClass without its EnvoyProxy. Correct those instructions and the replica example before merging.
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The title clearly and concisely summarizes the primary changes: the eduide cluster is provisioned and has no load balancer.
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Three places still said the `eduide` cluster does not exist. It does: parma,
a single node k3s that has been serving Bonn and Mannheim since 2026-08-28.
`clusters/eduide.yaml` was corrected when the cluster came up (#125), the
README, AGENTS.md and docs/environments.md were not.
Checked field by field against the live cluster rather than assumed: storage
class `local-path`, GatewayClass `eduide`, the ACME issuer's contact address,
the cert-manager ServiceMonitor, the Alertmanager config and the identity
ConfigMap all match the manifest as written.
`docs/cluster-setup.md` offered two ways to give EduIDE an address, both of
them a load balancer - the decision step that the doc itself warns produces a
cluster which reports itself healthy and serves nothing. parma has no load
balancer at all, so that page had no option covering the only cluster of ours
it applies to. Option (c) is now written down, with the hostNetwork dead end
the cluster manifest records.
The same step now also says to state the data plane's replica count. Leaving
it out is what took bonn and mannheim down on 2026-09-23: Envoy Gateway stops
reconciling the field when the EnvoyProxy omits it, so a single scale to zero
was permanent.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Actionable comments posted: 3
🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
In `@docs/cluster-setup.md`:
- Around line 119-121: Update docs/cluster-setup.md at lines 119–121 to name the
hostnames served by option (c); at lines 149–157, make the DNS check query the
hostname for the selected environment rather than always using the TUM hostname;
and at line 218, replace the outdated “not yet” DNS status with the current Bonn
and Mannheim state.
- Around line 131-132: Update the documentation for `bootstrap-cluster.yml`
options (b) and (c) to require `spec.envoyProxy.create: true` alongside
`spec.gatewayClass.create: true` and the `spec.envoyProxy` block.
- Around line 139-144: Update the `clusters/eduide.yaml` example referenced by
the guide to explicitly set `envoyDeployment.replicas` to 1 before its `patch`
entry, so the complete no-load-balancer configuration includes a defined replica
count.
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AGENTS.md
README.md
docs/cluster-setup.md
docs/environments.md
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…dress
Review feedback on the step-2 rewrite.
A GatewayClass has no address - the data plane does, whether that is a load
balancer or the node itself - so the prerequisites table sent an operator
looking for a field on the wrong resource. Step 2's heading still said "load
balancer address" after option (c) was added, which framed the one cluster
with no load balancer around infrastructure it does not have, and the traffic
path in envoy-gateway-setup.md still described the load balancer as the only
possibility.
The section also still said there were two ways out. There are three.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Review feedback, and one of the findings caught a false claim of mine.
The guide said "the chart defaults it to 1" about the Envoy Deployment's
replica count. No released chart does - that default is still in review as
EduIDE-Helm#40 - so the advice to state the replica count pointed at a manifest
that did not state it, and parma stayed one scale-to-zero away from the outage
it had just had. `clusters/eduide.yaml` now pins `replicas: 1` explicitly,
which protects the cluster on the chart it actually runs and still wins over
the chart default once that ships.
Options (b) and (c) also need `create: true` inside `spec.envoyProxy`, not just
the block: the chart defaults `envoyProxy.create` to false, so a block without
it renders no EnvoyProxy while `gatewayClass.create` still emits a
`parametersRef` naming one.
The verify snippet hard-coded the student cluster's hostname, and does not
apply as written to a ClusterIP data plane, where the Gateway's address is
never what DNS publishes. The DNS table still said Bonn and Mannheim did not
resolve; both have pointed at parma since it came up.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Option (a) joins a merged gateway whose EnvoyProxy belongs to another team, so
there is no envoyDeployment block in this repository to put replicas in. The
instruction said "whichever option you pick", which cannot be followed there.
Scoped to (b) and (c), with a paragraph saying where the exposure goes under
(a): it moves to the owner of the shared data plane, and scaling that to zero
takes EduIDE down along with everything else on it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Incorrect status and DNS equality check for option (c)
docs/cluster-setup.md:168
The preceding instruction says the Gateway status address and DNS answer must match for every option, but option (c) explicitly makes that comparison fail: its status can contain the Service's internal ClusterIP while DNS correctly points to the node. An operator could reject a working no-load-balancer setup as broken; scope the equality check to (a)/(b) and make the node-address/port check the primary verification for (c).
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Follow-up to the bonn/mannheim outage on parma. The chart-side fix is EduIDE-Helm#40; this is the documentation half.
The drift was not where I first said it was
clusters/eduide.yamldescribes parma correctly - #125 corrected it when the cluster came up. I verified every field against the live cluster rather than taking it on trust:storageClassName: local-pathgatewayClassName: eduideGatewayClass/eduideacmeEmail: admin.aet@xcit.tum.deClusterIssuer/letsencrypt-prod-gateway, same addressenvoyProxyhostPort 80/443,envoyService: ClusterIPmonitorCertManager: trueServiceMonitor/eduide-cert-manageralerting.channelsbonn + mannheimAlertmanagerConfig/eduide-alertseduide-cluster-identityreadsclusterName: eduideWhat had gone stale is the prose around it. Three places still said the cluster does not exist:
README.md- "Theeduidecluster is not provisioned yet."AGENTS.md- same claim, which is what every agent reads firstdocs/environments.md- "Not provisioned yet.", plus a paragraph about the two environments existing before their clusterThe gap that matters more
docs/cluster-setup.mdopens by warning that two of its manual steps "produce a cluster that reports itself healthy and serves nothing", and step 2 - deciding which address serves EduIDE - is the one it calls out as most dangerous. It offered exactly two answers, (a) join the merged gateway and (b) your own GatewayClass pinned to a MetalLB pool. Both assume a load balancer exists.parma has none. k3s runs there without servicelb and there is no MetalLB, so a
LoadBalancerService sitsPendingfor ever. The one cluster of ours that this page's most dangerous step actually applies to had no option describing it.Option (c) is now written down:
envoyService.type: ClusterIPplus aStrategicMergepatch giving the Envoy containerhostPort: 80/443, and the hostNetwork dead endclusters/eduide.yamlrecords - Envoy runs as non-root, Kubernetes cannot grantNET_BIND_SERVICEeffectively, so every listener failscannot bind '0.0.0.0:80': Permission deniedwhile the pod reportsRunning.The same step now also says to state the data plane's replica count, since omitting it is precisely what took both installations down on 2026-09-23.
The replica pin, and why I changed my mind
An earlier revision of this description said
envoyDeployment.replicaswas deliberately left out ofclusters/eduide.yaml, on the grounds that EduIDE-Helm#40 defaults it in the chart. That reasoning was wrong, and review caught it.No released chart defaults it - #40 is still in review. So the guide told readers to state a replica count, pointed at
clusters/eduide.yamlas the worked example, and that manifest did not state one; parma stayed one scale-to-zero away from repeating the outage this PR documents. The manifest now pinsreplicas: 1with the reason in a comment.This is not a duplicate source of truth once #40 lands: a cluster spec that names its own replicas wins over the chart default by design, which is the same precedence an HPA-driven cluster relies on.
Checks
./scripts/check-agents-md.sh(5 referenced paths check out),./scripts/test-deploy-logic.sh(ALL PASS), and all three cluster manifests validate againstschemas/cluster.schema.json.🤖 Generated with Claude Code
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