{"record":{"id":"e8bf9161546e276f","repo":"cilium/cilium","slug":"failed-to-write-cluster-configuration-w","errorCode":null,"errorMessage":"failed to write cluster configuration: %w","messagePattern":"failed to write cluster configuration: %w","errorType":"error_code","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/clustermesh/clustercfg/enforce.go","lineNumber":60,"sourceCode":"\t}\n\n\twatching := make(chan struct{})\n\tenforce := func(ctx context.Context) error {\n\t\tctx, cancel := context.WithTimeout(ctx, 5*time.Second)\n\t\tdefer cancel()\n\n\t\tselect {\n\t\t// Make sure that the watcher actually started. This is mostly for testing\n\t\t// purposes, to prevent possible race conditions, but it is also helpful\n\t\t// as a sanity check in production environments.\n\t\tcase <-watching:\n\t\tcase <-ctx.Done():\n\t\t\treturn fmt.Errorf(\"timed out waiting for cluster configuration watcher to be started\")\n\t\t}\n\n\t\t_, err := in.Client.UpdateIfDifferent(ctx, key, value, true)\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"failed to write cluster configuration: %w\", err)\n\t\t}\n\n\t\treturn nil\n\t}\n\n\ttrigger := job.NewTrigger()\n\tstore := in.StoreFactory.NewWatchStore(\n\t\tin.ClusterInfo.Name, store.KVPairCreator,\n\t\t&observer{\n\t\t\tkey:      in.ClusterInfo.Name,\n\t\t\texpected: value,\n\t\t\ttrigger:  trigger,\n\t\t},\n\t\tstore.RWSWithOnSyncCallback(func(context.Context) { close(watching) }),\n\t)\n\n\tin.JobGroup.Add(\n\t\tjob.OneShot(","sourceCodeStart":42,"sourceCodeEnd":78,"githubUrl":"https://github.com/cilium/cilium/blob/ac7b90affa4baf0642e6685319d56907b3a73a6d/pkg/clustermesh/clustercfg/enforce.go#L42-L78","documentation":"The enforce job periodically and on-trigger writes the marshalled CiliumClusterConfig to the kvstore key cilium/config/<cluster-name> via Client.UpdateIfDifferent. If that kvstore write fails, this error wraps the underlying cause (context deadline of 5s, kvstore unavailability, permission/lease errors, etc.).","triggerScenarios":"UpdateIfDifferent on the cluster-config key fails: kvstore (etcd) unreachable, 5-second context timeout exceeded, key access denied, or kvstore session/lease lost mid-write.","commonSituations":"etcd outage or network partition during clustermesh operation; etcd compaction/quota exceeded; slow etcd responses making the 5s deadline too tight; RBAC restrictions on the config prefix.","solutions":["Check etcd health and logs; restore kvstore connectivity","Look at the wrapped cause in the error to distinguish timeout vs access vs session errors","Raise kvstore timeout/resources if the 5s deadline is consistently exceeded under load","Verify etcd user permissions allow writes to the cilium/config prefix"],"exampleFix":null,"handlingStrategy":"retry","validationCode":"// pre-check kvstore write access\nctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)\n_, err := kvstoreClient.UpdateIfDifferent(ctx, key, value, true)","typeGuard":null,"tryCatchPattern":"if _, err := in.Client.UpdateIfDifferent(ctx, key, value, true); err != nil {\n\tvar retriable bool\n\tif errors.Is(err, context.DeadlineExceeded) { retriable = true }\n\t// otherwise inspect wrapped cause: etcd down, permissions, lease lost\n}","preventionTips":["Monitor etcd health and quota/compaction status","Ensure etcd RBAC grants write access to the cilium/config prefix","Keep the 5s enforce deadline in mind when sizing etcd clusters"],"tags":["go","clustermesh","kvstore","etcd","write-failed"],"backgroundTag":"kvstore-write-failed","analyzedSha":"ac7b90affa4baf0642e6685319d56907b3a73a6d","analyzedAt":"2026-08-31T18:27:15.868Z","schemaVersion":2},"datasetVersion":"2026-08-31T19:17:28.585Z"}