{"record":{"id":"e722d193c8c7cbcd","repo":"kubernetes/kops","slug":"unable-to-parse-configuration-server-url-q-w","errorCode":null,"errorMessage":"unable to parse configuration server url %q: %w","messagePattern":"unable to parse configuration server url %q: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"upup/pkg/fi/nodeup/command.go","lineNumber":829,"sourceCode":"\t}\n\n\t// Note: The url is overridden in every iteration of the loop below.\n\tclient := kopscontrollerclient.NewWithTLSServerName(authenticator, []byte(bootConfig.ConfigServer.CACertificates), url.URL{}, bootConfig.ConfigServer.TLSServerName)\n\tdefer client.Close()\n\n\t// Any one of these servers may be permanently unreachable from this node -- an IPv6-only\n\t// cluster lists the load balancer's IPv4 address alongside its IPv6 one, and only the\n\t// latter is routable from the nodes. So give each server a short turn and keep cycling\n\t// through the list, rather than spending the whole budget on whichever happens to sort first.\n\tclient.Backoff = perServerBootstrapBackoff\n\n\tdeadline := time.Now().Add(bootstrapTimeout)\n\tfor {\n\t\tvar merr error\n\t\tfor _, server := range bootConfig.ConfigServer.Servers {\n\t\t\tu, err := url.Parse(server)\n\t\t\tif err != nil {\n\t\t\t\tmerr = multierr.Append(merr, fmt.Errorf(\"unable to parse configuration server url %q: %w\", server, err))\n\t\t\t\tcontinue\n\t\t\t}\n\t\t\tclient.BaseURL = *u\n\n\t\t\trequest := nodeup.BootstrapRequest{\n\t\t\t\tAPIVersion:        nodeup.BootstrapAPIVersion,\n\t\t\t\tIncludeNodeConfig: true,\n\t\t\t}\n\n\t\t\tif challengeListener != nil {\n\t\t\t\trequest.Challenge = challengeListener.CreateChallenge()\n\t\t\t}\n\n\t\t\tvar resp nodeup.BootstrapResponse\n\t\t\terr = client.Query(ctx, &request, &resp)\n\t\t\tif err != nil {\n\t\t\t\tmerr = multierr.Append(merr, err)\n\t\t\t\tcontinue","sourceCodeStart":811,"sourceCodeEnd":847,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/upup/pkg/fi/nodeup/command.go#L811-L847","documentation":"nodeup iterates over bootConfig.ConfigServer.Servers and parses each entry with url.Parse before using it as the bootstrap API base URL. A server entry that is not a valid URL is collected into a multierr and wrapped with this message. It is a configuration-error: the kops bootstrap config's server list contains a malformed URL.","triggerScenarios":"A ConfigServer.Servers entry fails url.Parse — e.g. missing scheme (\"kube-api:12345\" instead of \"https://kube-api:12345\"), stray spaces, or garbage characters in the servers list.","commonSituations":"Hand-edited nodeup/bootstrap.conf or cloud-init templates with a typo; templating that produced an empty or partially-substituted URL; missing https:// scheme.","solutions":["Fix the server URL in the bootstrap config to include scheme and host, e.g. https://api.internal.example.com","Regenerate the node bootstrap config via `kops replace --phase cluster` or `kops update cluster` instead of hand-editing","Inspect nodeup logs for all appended merr entries to identify every malformed server entry","Validate each entry with `url.Parse` semantics: scheme://host[:port]"],"exampleFix":"// before (bootstrap config)\nconfigServer:\n  servers: [\"api.internal.example.com:443\"]\n// after\nconfigServer:\n  servers: [\"https://api.internal.example.com:443\"]","handlingStrategy":"validation","validationCode":"for _, server := range cfg.ConfigServer.Servers {\n  if _, err := url.Parse(server); err != nil {\n    return fmt.Errorf(\"invalid config server %q: %w\", server, err)\n  }\n  if !strings.Contains(server, \"://\") {\n    return fmt.Errorf(\"config server %q missing scheme\", server)\n  }\n}","typeGuard":null,"tryCatchPattern":"if err := runNodeup(ctx); err != nil {\n  var merr multerr.Error\n  if errors.As(err, &merr) { /* inspect each parsed-server error */ }\n  klog.Errorf(\"bootstrap failed: %v\", err)\n}","preventionTips":["Always include the https:// scheme in ConfigServer.Servers entries","Generate bootstrap config via kops CLI rather than hand-editing","Add CI validation of templated nodeup configs before deploy","Trim whitespace and reject empty strings in server lists at template time"],"tags":["configuration","nodeup","url-parsing"],"backgroundTag":"invalid-url-config","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T12:17:11.808Z"}