{"record":{"id":"d0245bb1bff9d16f","repo":"hashicorp/nomad","slug":"missing-node-name-for-client-registration","errorCode":null,"errorMessage":"missing node name for client registration","messagePattern":"missing node name for client registration","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"nomad/structs/node.go","lineNumber":609,"sourceCode":"\n\tWriteRequest\n}\n\n// Validate checks that the NodeRegisterRequest is valid. Any returned error can\n// be sent back to the client as a response to the RPC call.\nfunc (n *NodeRegisterRequest) Validate() error {\n\n\tif n.Node == nil {\n\t\treturn errors.New(\"missing node for client registration\")\n\t}\n\tif n.Node.ID == \"\" {\n\t\treturn errors.New(\"missing node ID for client registration\")\n\t}\n\tif n.Node.Datacenter == \"\" {\n\t\treturn errors.New(\"missing datacenter for client registration\")\n\t}\n\tif n.Node.Name == \"\" {\n\t\treturn errors.New(\"missing node name for client registration\")\n\t}\n\tif len(n.Node.Attributes) == 0 {\n\t\treturn errors.New(\"missing attributes for client registration\")\n\t}\n\tif n.Node.SecretID == \"\" {\n\t\treturn errors.New(\"missing node secret ID for client registration\")\n\t}\n\tif n.Node.NodePool != \"\" {\n\t\tif err := ValidateNodePoolName(n.Node.NodePool); err != nil {\n\t\t\treturn fmt.Errorf(\"invalid node pool: %v\", err)\n\t\t}\n\t\tif n.Node.NodePool == NodePoolAll {\n\t\t\treturn fmt.Errorf(\"node is not allowed to register in node pool %q\", NodePoolAll)\n\t\t}\n\t}\n\n\treturn nil\n}","sourceCodeStart":591,"sourceCodeEnd":627,"githubUrl":"https://github.com/hashicorp/nomad/blob/482b49bf1aec006f089bcfc7e632d8f6ac303e5e/nomad/structs/node.go#L591-L627","documentation":"NodeRegisterRequest.Validate returns this error when Node.Name is empty. The node name is the human-readable identifier shown in the UI and used by node meta/Constraint expressions (e.g. ${node.unique.name}); registration requires it.","triggerScenarios":"Calling Node.Register where the Node struct's Name field was left empty, typically when the client's `name` config option is unset and the caller did not default it to the hostname.","commonSituations":"Minimal client configs that omit the name option in environments where automatic hostname detection is disabled or failed; programmatically built registration requests for testing; provisioning tools that clear the name field.","solutions":["Set the `name` option in the client agent config or rely on the default hostname, then re-register.","Assign Node.Name explicitly (commonly os.Hostname()) when constructing the Node struct in code.","Fail fast in provisioning scripts if the computed name is empty before submitting registration."],"exampleFix":"// before\nnode := &structs.Node{ID: id, Datacenter: \"dc1\"}\n// after\nhostname, _ := os.Hostname()\nnode := &structs.Node{ID: id, Datacenter: \"dc1\", Name: hostname}","handlingStrategy":"validation","validationCode":"if node.Name == \"\" {\n\thost, err := os.Hostname()\n\tif err != nil || host == \"\" {\n\t\treturn errors.New(\"node name required: set client `name` config\")\n\t}\n\tnode.Name = host\n}","typeGuard":null,"tryCatchPattern":"if err := req.Validate(); err != nil {\n\tif strings.Contains(err.Error(), \"missing node name\") {\n\t\treturn fmt.Errorf(\"set client name or fix hostname detection: %w\", err)\n\t}\n\treturn err\n}","preventionTips":["Explicitly set the client `name` option in automation-managed configs.","Default to hostname only after verifying it is non-empty.","Include Name in registration pre-flight checks."],"tags":["nomad","rpc","validation","missing-field"],"backgroundTag":"missing-required-argument","analyzedSha":"482b49bf1aec006f089bcfc7e632d8f6ac303e5e","analyzedAt":"2026-09-04T07:54:14.808Z","contentChangedAt":"2026-09-04T07:54:14.808Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}