{"record":{"id":"702b2211c43430cf","repo":"kubernetes/kops","slug":"error-reconfiguring-group-v-output-s","errorCode":null,"errorMessage":"error reconfiguring group: %v\nOutput: %s","messagePattern":"error reconfiguring group: (.+?)\nOutput: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"upup/pkg/fi/nodeup/nodetasks/group.go","lineNumber":114,"sourceCode":"\t\toutput, err := cmd.CombinedOutput()\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"error creating group: %v\\nOutput: %s\", err, output)\n\t\t}\n\t} else {\n\t\tvar args []string\n\n\t\tif changes.GID != nil {\n\t\t\targs = append(args, \"-g\", strconv.Itoa(*e.GID))\n\t\t}\n\n\t\tif len(args) != 0 {\n\t\t\targs = append(args, e.Name)\n\t\t\tklog.Infof(\"Reconfiguring group %q\", e.Name)\n\t\t\tcmd := exec.Command(\"groupmod\", args...)\n\t\t\tklog.V(2).Infof(\"running command: groupmod %s\", strings.Join(args, \" \"))\n\t\t\toutput, err := cmd.CombinedOutput()\n\t\t\tif err != nil {\n\t\t\t\treturn fmt.Errorf(\"error reconfiguring group: %v\\nOutput: %s\", err, output)\n\t\t\t}\n\t\t}\n\t}\n\n\treturn nil\n}\n","sourceCodeStart":96,"sourceCodeEnd":121,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/upup/pkg/fi/nodeup/nodetasks/group.go#L96-L121","documentation":"nodeup ran 'groupmod' to update an existing OS group (e.g. changed GID) and the command exited non-zero. The wrapped output shows groupmod's own diagnostic. It is the update-path counterpart of the groupadd error.","triggerScenarios":"RenderLocal of a Group task where changes.GID (or other mutable fields) is non-nil; exec.Command(\"groupmod\", args...) fails, e.g. GID already in use.","commonSituations":"Requested GID is taken by another group; group was removed externally between create and modify; groupmod missing on the image.","solutions":["Read the Output: section to see groupmod's exact failure","Verify the target GID is free: getent group <gid>","Align the group's GID in the cluster spec with what the image already uses","Ensure shadow-utils (groupmod) is installed on the node image"],"exampleFix":"// before\nGID: fi.Int32(999) // conflicts with existing group 999\n// after\nGID: fi.Int32(1500) // pick an unassigned GID","handlingStrategy":"validation","validationCode":"// pre-check that the target GID is free\nif out, err := exec.Command(\"getent\", \"group\", strconv.Itoa(int(gid))).Output(); err == nil {\n  return fmt.Errorf(\"GID %d already used by %s\", gid, out)\n}","typeGuard":null,"tryCatchPattern":"if err := t.RenderLocal(ctx, a, b); err != nil {\n  if strings.Contains(err.Error(), \"error reconfiguring group\") {\n    // log groupmod output from the error and fail with context\n    return fmt.Errorf(\"groupmod failed: %w\", err)\n  }\n  return err\n}","preventionTips":["Pick GIDs outside the image's existing range","Verify groupmod exists in the base image","Keep group definitions stable across kOps upgrades"],"tags":["nodeup","groupmod","os-groups"],"backgroundTag":"groupmod-failed","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T07:17:12.445Z"}