{"record":{"id":"81b691d663e99804","repo":"cilium/cilium","slug":"failed-to-write-configurations-to-s-w","errorCode":null,"errorMessage":"failed to write configurations to %s: %w","messagePattern":"failed to write configurations to (.+?): %w","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cilium-dbg/cmd/build-config.go","lineNumber":171,"sourceCode":"\t\t\t} else if len(parsed) == 2 {\n\t\t\t\tsource.Namespace = parsed[0]\n\t\t\t\tsource.Name = parsed[1]\n\t\t\t}\n\t\t}\n\t\tsources = append(sources, source)\n\t}\n\n\tconfig, err := resolver.ResolveConfigurations(ctx, bc.log, bc.client, bc.cfg.NodeName, sources, bc.cfg.AllowConfigKeys, bc.cfg.DenyConfigKeys)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"failed to resolve configurations: %w\", err)\n\t}\n\n\tif err := os.MkdirAll(bc.cfg.Dest, 0777); err != nil {\n\t\treturn fmt.Errorf(\"failed to create config directory %s: %w\", bc.cfg.Dest, err)\n\t}\n\n\tif err := resolver.WriteConfigurations(ctx, bc.log, bc.cfg.Dest, config); err != nil {\n\t\treturn fmt.Errorf(\"failed to write configurations to %s: %w\", bc.cfg.Dest, err)\n\t}\n\n\tbc.shutdowner.Shutdown()\n\treturn nil\n}\n","sourceCodeStart":153,"sourceCodeEnd":177,"githubUrl":"https://github.com/cilium/cilium/blob/ac7b90affa4baf0642e6685319d56907b3a73a6d/cilium-dbg/cmd/build-config.go#L153-L177","documentation":"This error is returned by the `cilium-dbg build-config` command when the call to resolver.WriteConfigurations fails after the destination directory has already been created. It wraps the underlying error with the destination path so the developer can see which directory the resolver could not write configuration files into. The build-config command renders the effective Cilium configuration and shuts down after writing, so any failure here aborts config generation.","triggerScenarios":"Running `cilium-dbg build-config` when resolver.WriteConfigurations(ctx, bc.log, bc.cfg.Dest, config) returns an error — e.g. the destination directory exists but is not writable, the filesystem is full or read-only, or the resolver hits an internal error serializing the configuration.","commonSituations":"Running the container as a non-root user without write permission on the --dest directory; mounting the destination path read-only in a pod; disk-full conditions on the node; SELinux/AppArmor denials on the config directory; a resolver bug or invalid config values that fail during rendering.","solutions":["Check permissions on the destination directory (bc.cfg.Dest) and ensure the process user can write to it (it is created with 0777 but may still be restricted by mount options/SELinux).","Inspect the wrapped error (%w) printed after this message — it names the real cause (EACCES, ENOSPC, EROFS, etc.) and fix accordingly.","Verify the destination path is not on a read-only volume and that disk space is available (df -h).","If running in Kubernetes, check the pod's securityContext (runAsUser, fsGroup) and volume mount readOnly flags."],"exampleFix":"// before\ncmd := exec.Command(\"cilium-dbg\", \"build-config\", \"--dest\", \"/etc/cilium\") // dir mounted read-only\n// after\n// mount the volume read-write and ensure the run-as user owns it:\n// securityContext:\n//   runAsUser: 0\n// volumes:\n//   - name: cilium-config\n//     emptyDir: {} # not readOnly","handlingStrategy":"validation","validationCode":"info, err := os.Stat(dest)\nif err == nil && !info.IsDir() { return fmt.Errorf(\"%s is not a directory\", dest) }\nprobe := filepath.Join(dest, \".write-probe\")\nif err := os.WriteFile(probe, nil, 0600); err != nil { return fmt.Errorf(\"dest %s not writable: %w\", dest, err) }\nos.Remove(probe)","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Run the command as a user with write access to the destination (or root).","Ensure the destination volume is mounted read-write and not full (check df -h and mount options).","Always read the wrapped error after 'failed to write configurations to' — it names the root cause.","Test build-config in CI with the same volume/securityContext as production."],"tags":["filesystem","permissions","cilium","cli"],"backgroundTag":"permission-denied","analyzedSha":"ac7b90affa4baf0642e6685319d56907b3a73a6d","analyzedAt":"2026-08-31T18:27:15.868Z","schemaVersion":2},"datasetVersion":"2026-08-31T19:17:28.585Z"}