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Nodes - HTTP API
The /node endpoints are used to query for and interact with client nodes.

Nodes HTTP API

The /node endpoints are used to query for and interact with client nodes.

Requests to these endpoints are always forwarded to and answered by Nomad servers. The /client endpoints provide node information that are answered directly by the Nomad client.

List Nodes

This endpoint lists all nodes registered with Nomad.

Method Path Produces
GET /v1/nodes application/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries ACL Required
YES node:read

Parameters

  • prefix (string: "")- Specifies a string to filter nodes based on an ID prefix. Because the value is decoded to bytes, the prefix must have an even number of hexadecimal characters (0-9a-f). This is specified as a query string parameter.

  • next_token (string: "") - This endpoint supports paging. The next_token parameter accepts a string which identifies the next expected node. This value can be obtained from the X-Nomad-NextToken header from the previous response.

  • per_page (int: 0) - Specifies a maximum number of nodes to return for this request. If omitted, the response is not paginated. The value of the X-Nomad-NextToken header of the last response can be used as the next_token of the next request to fetch additional pages.

  • filter (string: "") - Specifies the expression used to filter the results. Consider using pagination or a query parameter to reduce resource used to serve the request.

  • resources (bool: false) - Specifies whether or not to include the NodeResources and ReservedResources fields in the response.

  • os (bool: false) - Specifies whether or not to include special attributes such as operating system name in the response.

Sample Request

$ curl \
    http://localhost:4646/v1/nodes

$ curl \
    http://localhost:4646/v1/nodes?prefix=f7476465

$ curl \
    http://localhost:4646/v1/nodes?os=true

Sample Response

[
  {
    "Address": "10.138.0.5",
    "Attributes": {
      "os.name": "ubuntu"
    },
    "CreateIndex": 6,
    "Datacenter": "dc1",
    "Drain": false,
    "Drivers": {
      "java": {
        "Attributes": {
          "driver.java.runtime": "OpenJDK Runtime Environment (build 1.8.0_162-8u162-b12-1~deb9u1-b12)",
          "driver.java.vm": "OpenJDK 64-Bit Server VM (build 25.162-b12, mixed mode)",
          "driver.java.version": "openjdk version \"1.8.0_162"
        },
        "Detected": true,
        "HealthDescription": "",
        "Healthy": true,
        "UpdateTime": "2018-04-11T23:33:48.781948669Z"
      },
      "qemu": {
        "Attributes": null,
        "Detected": false,
        "HealthDescription": "",
        "Healthy": false,
        "UpdateTime": "2018-04-11T23:33:48.7819898Z"
      },
      "rkt": {
        "Attributes": {
          "driver.rkt.appc.version": "0.8.11",
          "driver.rkt.volumes.enabled": "1",
          "driver.rkt.version": "1.29.0"
        },
        "Detected": true,
        "HealthDescription": "Driver rkt is detected: true",
        "Healthy": true,
        "UpdateTime": "2018-04-11T23:34:48.81079772Z"
      },
      "docker": {
        "Attributes": {
          "driver.docker.bridge_ip": "172.17.0.1",
          "driver.docker.version": "18.03.0-ce",
          "driver.docker.volumes.enabled": "1"
        },
        "Detected": true,
        "HealthDescription": "Driver is available and responsive",
        "Healthy": true,
        "UpdateTime": "2018-04-11T23:34:48.713720323Z"
      },
      "exec": {
        "Attributes": {},
        "Detected": true,
        "HealthDescription": "Driver exec is detected: true",
        "Healthy": true,
        "UpdateTime": "2018-04-11T23:34:48.711026521Z"
      },
      "raw_exec": {
        "Attributes": {},
        "Detected": true,
        "HealthDescription": "",
        "Healthy": true,
        "UpdateTime": "2018-04-11T23:33:48.710448534Z"
      }
    },
    "ID": "f7476465-4d6e-c0de-26d0-e383c49be941",
    "LastDrain": null,
    "ModifyIndex": 2526,
    "Name": "nomad-4",
    "NodeClass": "",
    "NodePool": "default",
    "SchedulingEligibility": "eligible",
    "Status": "ready",
    "StatusDescription": "",
    "Version": "0.8.0-rc1"
  }
]

Read Node

This endpoint queries the status of a client node.

Method Path Produces
GET /v1/node/:node_id application/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries ACL Required
YES node:read

Parameters

  • :node_id (string: <required>)- Specifies the ID of the node. This must be the full UUID, not the short 8-character one. This is specified as part of the path.

Sample Request

$ curl \
    http://localhost:4646/v1/node/f7476465-4d6e-c0de-26d0-e383c49be941

Sample Response

{
  "Attributes": {
    "consul.datacenter": "dc1",
    "consul.revision": "d2adfc0bd",
    "consul.server": "true",
    "consul.version": "1.5.2",
    "cpu.arch": "amd64",
    "cpu.frequency": "4000",
    "cpu.modelname": "Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz",
    "cpu.numcores": "8",
    "cpu.totalcompute": "32000",
    "driver.docker": "1",
    "driver.docker.bridge_ip": "172.17.0.1",
    "driver.docker.os_type": "linux",
    "driver.docker.runtimes": "runc",
    "driver.docker.version": "18.09.6",
    "driver.docker.volumes.enabled": "true",
    "driver.mock_driver": "1",
    "driver.raw_exec": "1",
    "kernel.name": "linux",
    "kernel.version": "4.19.56",
    "memory.totalbytes": "16571674624",
    "nomad.advertise.address": "127.0.0.1:4646",
    "nomad.revision": "30da2b8f6c3aa860113c9d313c695a05eff5bb97+CHANGES",
    "nomad.version": "1.1.0",
    "os.name": "nixos",
    "os.signals": "SIGTTOU,SIGTTIN,SIGSTOP,SIGSYS,SIGXCPU,SIGBUS,SIGKILL,SIGTERM,SIGIOT,SIGILL,SIGIO,SIGQUIT,SIGSEGV,SIGUSR1,SIGXFSZ,SIGCHLD,SIGUSR2,SIGURG,SIGFPE,SIGHUP,SIGINT,SIGPROF,SIGCONT,SIGALRM,SIGPIPE,SIGTRAP,SIGTSTP,SIGWINCH,SIGABRT",
    "os.version": "\"19.03.173017.85f820d6e41 (Koi)\"",
    "unique.cgroup.mountpoint": "/sys/fs/cgroup",
    "unique.consul.name": "mew",
    "unique.hostname": "mew",
    "unique.network.ip-address": "127.0.0.1",
    "unique.storage.bytesfree": "8273698816",
    "unique.storage.bytestotal": "8285835264",
    "unique.storage.volume": "tmpfs"
  },
  "ComputedClass": "v1:390058673753570317",
  "CreateIndex": 6,
  "Datacenter": "dc1",
  "Drain": false,
  "DrainStrategy": null,
  "Drivers": {
    "docker": {
      "Attributes": {
        "driver.docker": "true",
        "driver.docker.bridge_ip": "172.17.0.1",
        "driver.docker.os_type": "linux",
        "driver.docker.runtimes": "runc",
        "driver.docker.version": "18.09.6",
        "driver.docker.volumes.enabled": "true"
      },
      "Detected": true,
      "HealthDescription": "Healthy",
      "Healthy": true,
      "UpdateTime": "2019-08-26T12:22:50.762716458+02:00"
    },
    "exec": {
      "Attributes": null,
      "Detected": false,
      "HealthDescription": "Driver must run as root",
      "Healthy": false,
      "UpdateTime": "2019-08-26T12:22:50.6873373+02:00"
    },
    "java": {
      "Attributes": null,
      "Detected": false,
      "HealthDescription": "Driver must run as root",
      "Healthy": false,
      "UpdateTime": "2019-08-26T12:22:50.687274359+02:00"
    },
    "qemu": {
      "Attributes": null,
      "Detected": false,
      "HealthDescription": "",
      "Healthy": false,
      "UpdateTime": "2019-08-26T12:22:50.688023782+02:00"
    },
    "raw_exec": {
      "Attributes": {
        "driver.raw_exec": "true"
      },
      "Detected": true,
      "HealthDescription": "Healthy",
      "Healthy": true,
      "UpdateTime": "2019-08-26T12:22:50.687733347+02:00"
    },
    "rkt": {
      "Attributes": null,
      "Detected": false,
      "HealthDescription": "Driver must run as root",
      "Healthy": false,
      "UpdateTime": "2019-08-26T12:22:50.68796043+02:00"
    }
  },
  "Events": [
    {
      "CreateIndex": 6,
      "Details": null,
      "Message": "Node registered",
      "Subsystem": "Cluster",
      "Timestamp": "2021-03-31T12:11:39Z"
    },
    {
      "CreateIndex": 11,
      "Details": null,
      "Message": "Node drain strategy set",
      "Subsystem": "Drain",
      "Timestamp": "2021-03-31T12:12:20.213412Z"
    },
    {
      "CreateIndex": 12,
      "Details": null,
      "Message": "Node drain complete",
      "Subsystem": "Drain",
      "Timestamp": "2021-03-31T12:12:20.213639Z"
    }
  ],
  "HTTPAddr": "127.0.0.1:4646",
  "HostVolumes": {
    "certificates": {
      "Name": "certificates",
      "Path": "/etc/ssl/certs",
      "ReadOnly": true
    },
    "prod-mysql-a": {
      "Name": "prod-mysql-a",
      "Path": "/data/mysql",
      "ReadOnly": false
    }
  },
  "HostNetworks" : {
    "public": {
      "Name": "public",
      "CIDR": "10.199.0.200/24",
      "ReservedPorts": "8080,8081"
    }
  }
  "ID": "1ac61e33-a465-2ace-f63f-cffa1285e7eb",
  "LastDrain": {
    "AccessorID": "4e1b7ce1-f8aa-d7ff-09f1-55c3a0fd3988",
    "Meta": {
      "message": "node maintenance"
    },
    "StartedAt": "2021-03-31T12:12:20Z",
    "Status": "complete",
    "UpdatedAt": "2021-03-31T12:12:20Z"
  },
  "Links": {
    "consul": "dc1.mew"
  },
  "Meta": {
    "connect.log_level": "info",
    "connect.sidecar_image": "envoyproxy/envoy:v1.11.1"
  },
  "ModifyIndex": 14,
  "Name": "mew",
  "NodeClass": "",
  "NodePool": "default",
  "NodeResources": {
    "Cpu": {
      "CpuShares": 32000
    },
    "Devices": [
      {
        "Attributes": {
          "attrB": {
            "Float": 10.5,
            "Unit": "MW"
          },
          "attrA": {
            "Int": 1024,
            "Unit": "MB"
          }
        },
        "Instances": [
          {
            "HealthDescription": "",
            "Healthy": true,
            "ID": "6a61929e-d572-092d-5921-156a913f8e56",
            "Locality": {
              "PciBusID": "77cda534-0660-2688-6c2e-ad6c62fc5ff3"
            }
          }
        ],
        "Name": "modelA",
        "Type": "skeleton",
        "Vendor": "hashicorp"
      },
      {
        "Attributes": {
          "attrB": {
            "Float": 10.5,
            "Unit": "MW"
          },
          "attrA": {
            "Int": 1024,
            "Unit": "MB"
          }
        },
        "Instances": [
          {
            "HealthDescription": "",
            "Healthy": true,
            "ID": "73af5d3e-00f9-0786-9bc1-8f5ffa953f15",
            "Locality": {
              "PciBusID": "dbda64d1-ad25-6c7c-d3fb-798bae0581bf"
            }
          }
        ],
        "Name": "modelB",
        "Type": "skeleton",
        "Vendor": "hashicorp"
      }
    ],
    "Disk": {
      "DiskMB": 7890
    },
    "Memory": {
      "MemoryMB": 15803
    },
    "Networks": [
      {
        "CIDR": "127.0.0.1/32",
        "Device": "lo",
        "DynamicPorts": null,
        "IP": "127.0.0.1",
        "MBits": 1000,
        "Mode": "",
        "ReservedPorts": null
      },
      {
        "CIDR": "::1/128",
        "Device": "lo",
        "DynamicPorts": null,
        "IP": "::1",
        "MBits": 1000,
        "Mode": "",
        "ReservedPorts": null
      }
    ],
    "NodeNetworks": [
      {
        "Addresses": [
          {
            "Address": "127.0.0.1",
            "Alias": "default",
            "Family": "ipv4",
            "Gateway": "",
            "ReservedPorts": ""
          }
        ],
        "Device": "lo",
        "MacAddress": "00:00:00:00:00:00",
        "Mode": "host"
      }
    ]
  },
  "Reserved": {
    "CPU": 0,
    "Devices": null,
    "DiskMB": 0,
    "IOPS": 0,
    "MemoryMB": 0,
    "Networks": null
  },
  "ReservedResources": {
    "Cpu": {
      "CpuShares": 0
    },
    "Disk": {
      "DiskMB": 0
    },
    "Memory": {
      "MemoryMB": 0
    },
    "Networks": {
      "ReservedHostPorts": ""
    }
  },
  "Resources": {
    "CPU": 32000,
    "Devices": null,
    "DiskMB": 7890,
    "IOPS": 0,
    "MemoryMB": 15803,
    "Networks": [
      {
        "CIDR": "127.0.0.1/32",
        "Device": "lo",
        "DynamicPorts": null,
        "IP": "127.0.0.1",
        "MBits": 1000,
        "Mode": "",
        "ReservedPorts": null
      },
      {
        "CIDR": "::1/128",
        "Device": "lo",
        "DynamicPorts": null,
        "IP": "::1",
        "MBits": 1000,
        "Mode": "",
        "ReservedPorts": null
      }
    ]
  },
  "SchedulingEligibility": "eligible",
  "SecretID": "",
  "Status": "ready",
  "StatusDescription": "",
  "StatusUpdatedAt": 1566814982,
  "TLSEnabled": false
}

List Node Allocations

This endpoint lists all of the allocations for the given node. This can be used to determine what allocations have been scheduled on the node, their current status, and the values of dynamically assigned resources, like ports.

Method Path Produces
GET /v1/node/:node_id/allocations application/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries ACL Required
YES node:read,namespace:read-job

Parameters

  • :node_id (string: <required>)- Specifies the UUID of the node. This must be the full UUID, not the short 8-character one. This is specified as part of the path.

Sample Request

$ curl \
    http://localhost:4646/v1/node/e02b6169-83bd-9df6-69bd-832765f333eb/allocations

Sample Response

[
  {
    "AllocModifyIndex": 2555,
    "ClientDescription": "",
    "ClientStatus": "running",
    "CreateIndex": 2555,
    "CreateTime": 1523490066575461000,
    "DeploymentID": "",
    "DeploymentStatus": {
      "Healthy": true,
      "ModifyIndex": 0
    },
    "DesiredDescription": "",
    "DesiredStatus": "run",
    "DesiredTransition": {
      "Migrate": null
    },
    "EvalID": "5129bc74-9785-c39a-08da-bddc8aa778b1",
    "FollowupEvalID": "",
    "ID": "fefe81d0-08b2-4eca-fae6-6560cde46d31",
    "Job": {
      "AllAtOnce": false,
      "Constraints": null,
      "CreateIndex": 2553,
      "Datacenters": ["dc1"],
      "ID": "webapp",
      "JobModifyIndex": 2553,
      "Meta": null,
      "ModifyIndex": 2554,
      "Name": "webapp",
      "Namespace": "default",
      "ParameterizedJob": null,
      "ParentID": "",
      "Payload": null,
      "Periodic": null,
      "Priority": 50,
      "Region": "global",
      "Stable": false,
      "Status": "pending",
      "StatusDescription": "",
      "Stop": false,
      "SubmitTime": 1523490066563405000,
      "TaskGroups": [
        {
          "Constraints": null,
          "Count": 9,
          "EphemeralDisk": {
            "Migrate": false,
            "SizeMB": 300,
            "Sticky": false
          },
          "Meta": null,
          "Migrate": {
            "HealthCheck": "checks",
            "HealthyDeadline": 300000000000,
            "MaxParallel": 2,
            "MinHealthyTime": 15000000000
          },
          "Name": "webapp",
          "ReschedulePolicy": {
            "Attempts": 0,
            "Delay": 30000000000,
            "DelayFunction": "exponential",
            "Interval": 0,
            "MaxDelay": 3600000000000,
            "Unlimited": true
          },
          "RestartPolicy": {
            "Attempts": 2,
            "Delay": 15000000000,
            "Interval": 1800000000000,
            "Mode": "fail"
          },
          "Tasks": [
            {
              "Artifacts": null,
              "Config": {
                "args": ["-text", "ok4"],
                "image": "hashicorp/http-echo:0.2.3",
                "port_map": [
                  {
                    "http": 5678
                  }
                ]
              },
              "Constraints": null,
              "DispatchPayload": null,
              "Driver": "docker",
              "Env": null,
              "KillSignal": "",
              "KillTimeout": 5000000000,
              "Leader": false,
              "LogConfig": {
                "MaxFileSizeMB": 10,
                "MaxFiles": 10
              },
              "Meta": null,
              "Name": "webapp",
              "Resources": {
                "CPU": 100,
                "DiskMB": 0,
                "MemoryMB": 300,
                "Networks": [
                  {
                    "CIDR": "",
                    "Device": "",
                    "DynamicPorts": [
                      {
                        "Label": "http",
                        "Value": 0
                      }
                    ],
                    "IP": "",
                    "MBits": 10,
                    "ReservedPorts": null
                  }
                ]
              },
              "Services": [
                {
                  "AddressMode": "auto",
                  "Checks": [
                    {
                      "AddressMode": "",
                      "Args": null,
                      "CheckRestart": null,
                      "Command": "",
                      "Header": null,
                      "InitialStatus": "",
                      "Interval": 10000000000,
                      "Method": "",
                      "Name": "http-ok",
                      "Path": "/",
                      "PortLabel": "",
                      "Protocol": "",
                      "TLSSkipVerify": false,
                      "Timeout": 2000000000,
                      "Type": "http"
                    }
                  ],
                  "Name": "webapp",
                  "PortLabel": "http",
                  "Tags": null
                }
              ],
              "ShutdownDelay": 0,
              "Templates": null,
              "User": "",
              "Vault": null
            }
          ],
          "Update": null
        }
      ],
      "Type": "service",
      "Update": {
        "AutoRevert": false,
        "Canary": 0,
        "HealthCheck": "",
        "HealthyDeadline": 0,
        "MaxParallel": 0,
        "MinHealthyTime": 0,
        "Stagger": 0
      },
      "VaultToken": "",
      "Version": 0
    },
    "JobID": "webapp",
    "Metrics": {
      "AllocationTime": 63337,
      "ClassExhausted": null,
      "ClassFiltered": null,
      "CoalescedFailures": 0,
      "ConstraintFiltered": null,
      "DimensionExhausted": null,
      "NodesAvailable": {
        "dc1": 2
      },
      "NodesEvaluated": 2,
      "NodesExhausted": 0,
      "NodesFiltered": 0,
      "NodesInPool": 2,
      "QuotaExhausted": null,
      "Scores": {
        "46f1c6c4-a0e5-21f6-fd5c-d76c3d84e806.binpack": 2.6950883117541586,
        "f7476465-4d6e-c0de-26d0-e383c49be941.binpack": 2.6950883117541586
      }
    },
    "ModifyIndex": 2567,
    "ModifyTime": 1523490089807324000,
    "Name": "webapp.webapp[0]",
    "Namespace": "default",
    "NextAllocation": "",
    "NodeID": "f7476465-4d6e-c0de-26d0-e383c49be941",
    "PreviousAllocation": "",
    "RescheduleTracker": null,
    "Resources": {
      "CPU": 100,
      "DiskMB": 300,
      "MemoryMB": 300,
      "Networks": [
        {
          "CIDR": "",
          "Device": "eth0",
          "DynamicPorts": [
            {
              "Label": "http",
              "Value": 25920
            }
          ],
          "IP": "10.138.0.5",
          "MBits": 10,
          "ReservedPorts": null
        }
      ]
    },
    "SharedResources": {
      "CPU": 0,
      "DiskMB": 300,
      "MemoryMB": 0,
      "Networks": null
    },
    "TaskGroup": "webapp",
    "TaskResources": {
      "webapp": {
        "CPU": 100,
        "DiskMB": 0,
        "MemoryMB": 300,
        "Networks": [
          {
            "CIDR": "",
            "Device": "eth0",
            "DynamicPorts": [
              {
                "Label": "http",
                "Value": 25920
              }
            ],
            "IP": "10.138.0.5",
            "MBits": 10,
            "ReservedPorts": null
          }
        ]
      }
    },
    "TaskStates": {
      "webapp": {
        "Events": [
          {
            "Details": {},
            "DiskLimit": 0,
            "DisplayMessage": "Task received by client",
            "DownloadError": "",
            "DriverError": "",
            "DriverMessage": "",
            "ExitCode": 0,
            "FailedSibling": "",
            "FailsTask": false,
            "GenericSource": "",
            "KillError": "",
            "KillReason": "",
            "KillTimeout": 0,
            "Message": "",
            "RestartReason": "",
            "SetupError": "",
            "Signal": 0,
            "StartDelay": 0,
            "TaskSignal": "",
            "TaskSignalReason": "",
            "Time": 1523490066712543500,
            "Type": "Received",
            "ValidationError": "",
            "VaultError": ""
          },
          {
            "Details": {
              "message": "Building Task Directory"
            },
            "DiskLimit": 0,
            "DisplayMessage": "Building Task Directory",
            "DownloadError": "",
            "DriverError": "",
            "DriverMessage": "",
            "ExitCode": 0,
            "FailedSibling": "",
            "FailsTask": false,
            "GenericSource": "",
            "KillError": "",
            "KillReason": "",
            "KillTimeout": 0,
            "Message": "Building Task Directory",
            "RestartReason": "",
            "SetupError": "",
            "Signal": 0,
            "StartDelay": 0,
            "TaskSignal": "",
            "TaskSignalReason": "",
            "Time": 1523490066715208000,
            "Type": "Task Setup",
            "ValidationError": "",
            "VaultError": ""
          },
          {
            "Details": {},
            "DiskLimit": 0,
            "DisplayMessage": "Task started by client",
            "DownloadError": "",
            "DriverError": "",
            "DriverMessage": "",
            "ExitCode": 0,
            "FailedSibling": "",
            "FailsTask": false,
            "GenericSource": "",
            "KillError": "",
            "KillReason": "",
            "KillTimeout": 0,
            "Message": "",
            "RestartReason": "",
            "SetupError": "",
            "Signal": 0,
            "StartDelay": 0,
            "TaskSignal": "",
            "TaskSignalReason": "",
            "Time": 1523490068433051100,
            "Type": "Started",
            "ValidationError": "",
            "VaultError": ""
          }
        ],
        "Failed": false,
        "FinishedAt": "0001-01-01T00:00:00Z",
        "LastRestart": "0001-01-01T00:00:00Z",
        "Restarts": 0,
        "StartedAt": "2018-04-11T23:41:08.445128764Z",
        "State": "running"
      }
    }
  }
]

Create Node Evaluation

This endpoint creates a new evaluation for the given node. This can be used to force a run of the scheduling logic.

Method Path Produces
POST /v1/node/:node_id/evaluate application/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries ACL Required
NO node:write

Parameters

  • :node_id (string: <required>)- Specifies the UUID of the node. This must be the full UUID, not the short 8-character one. This is specified as part of the path.

Sample Request

$ curl \
    -XPOST \
    http://localhost:4646/v1/node/fb2170a8-257d-3c64-b14d-bc06cc94e34c/evaluate

Sample Response

{
  "EvalCreateIndex": 3671,
  "EvalIDs": ["4dfc2db7-b481-c53b-3072-14479aa44be3"],
  "HeartbeatTTL": 0,
  "Index": 3671,
  "KnownLeader": false,
  "LastContact": 0,
  "LeaderRPCAddr": "10.138.0.2:4647",
  "NodeModifyIndex": 0,
  "NumNodes": 3,
  "Servers": [
    {
      "Datacenter": "dc1",
      "RPCAdvertiseAddr": "10.138.0.2:4647",
      "RPCMajorVersion": 1,
      "RPCMinorVersion": 1
    },
    {
      "Datacenter": "dc1",
      "RPCAdvertiseAddr": "10.138.0.3:4647",
      "RPCMajorVersion": 1,
      "RPCMinorVersion": 1
    },
    {
      "Datacenter": "dc1",
      "RPCAdvertiseAddr": "10.138.0.4:4647",
      "RPCMajorVersion": 1,
      "RPCMinorVersion": 1
    }
  ]
}

Drain Node

This endpoint toggles the drain mode of the node. When draining is enabled, no further allocations will be assigned to this node, and existing allocations will be migrated to new nodes. See the Workload Migration Guide for suggested usage.

Method Path Produces
POST /v1/node/:node_id/drain application/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries ACL Required
NO node:write

Parameters

  • :node_id (string: <required>)- Specifies the UUID of the node. This must be the full UUID, not the short 8-character one. This is specified as part of the path.

  • DrainSpec (object: <optional>) - Specifies if drain mode should be enabled. A missing or null value disables an existing drain.

    • Deadline (int: <required>) - Specifies how long to wait in nanoseconds for allocations to finish migrating before they are force stopped. This is also how long batch jobs are given to complete before being migrated.

    • IgnoreSystemJobs (bool: false) - Specifies whether or not to stop system jobs as part of a drain. By default system jobs will be stopped after all other allocations have migrated or the deadline is reached. Setting this to true means system jobs are always left running.

  • MarkEligible (bool: false) - Specifies whether to mark a node as eligible for scheduling again when disabling a drain.

  • Meta (json: <optional>) - A JSON map of strings with drain operation metadata that will be persisted in .LastDrain.Meta.

Sample Payload

{
  "DrainSpec": {
    "Deadline": 3600000000000,
    "IgnoreSystemJobs": true
  },
  "Meta": {
    "message": "drain for maintenance"
  }
}

Sample Request

$ curl \
    -XPOST \
    --data @drain.json \
    http://localhost:4646/v1/node/fb2170a8-257d-3c64-b14d-bc06cc94e34c/drain

Sample Response

{
  "EvalCreateIndex": 0,
  "EvalIDs": null,
  "Index": 3742,
  "NodeModifyIndex": 3742
}

Purge Node

This endpoint purges a node from the system. Nodes can still join the cluster if they are alive.

Method Path Produces
POST /v1/node/:node_id/purge application/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries ACL Required
NO node:write

Parameters

  • :node_id (string: <required>)- Specifies the UUID of the node. This must be the full UUID, not the short 8-character one. This is specified as part of the path.

Sample Request

$ curl \
    -XPOST http://localhost:4646/v1/node/f7476465-4d6e-c0de-26d0-e383c49be941/purge

Sample Response

{
  "EvalCreateIndex": 3817,
  "EvalIDs": ["71bad787-5ab1-9939-be02-4809441583cd"],
  "HeartbeatTTL": 0,
  "Index": 3816,
  "KnownLeader": false,
  "LastContact": 0,
  "LeaderRPCAddr": "",
  "NodeModifyIndex": 3816,
  "NumNodes": 0,
  "Servers": null
}

Toggle Node Eligibility

This endpoint toggles the scheduling eligibility of the node.

Method Path Produces
POST /v1/node/:node_id/eligibility application/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries ACL Required
NO node:write

Parameters

  • :node_id (string: <required>)- Specifies the UUID of the node. This must be the full UUID, not the short 8-character one. This is specified as part of the path.

  • Eligibility (string: <required>) - Either eligible or ineligible.

Sample Payload

{
  "Eligibility": "ineligible"
}

Sample Request

$ curl \
    -XPOST \
    --data @eligibility.json \
    http://localhost:4646/v1/node/fb2170a8-257d-3c64-b14d-bc06cc94e34c/eligibility

Sample Response

{
  "EvalCreateIndex": 0,
  "EvalIDs": null,
  "Index": 3742,
  "NodeModifyIndex": 3742
}

Field Reference

  • Events - A list of the last 10 node events for this node. A node event is a high level concept of noteworthy events for a node.

    Each node event has the following fields:

    • Message - The specific message for the event, detailing what occurred.

    • Subsystem - The subsystem where the node event took place. Subsystems include:

      • Drain - The Nomad server draining subsystem.

      • Driver - The Nomad client driver subsystem.

      • Heartbeat - Either Nomad client or server heartbeating subsystem.

      • Cluster - Nomad server cluster management subsystem.

    • Details - Any further details about the event, formatted as a key/value pair.

    • Timestamp - Each node event has an ISO 8601 timestamp.

    • CreateIndex - The Raft index at which the event was committed.