Coordinate HTTP Endpoint

The /coordinate endpoints query for the network coordinates for nodes in the local datacenter as well as Consul servers in the local datacenter and remote datacenters.

Please see the Network Coordinates internals guide for more information on how these coordinates are computed, and for details on how to perform calculations with them.

Read WAN Coordinates

This endpoint returns the WAN network coordinates for all Consul servers, organized by datacenters. It serves data out of the server's local Serf data, so its results may vary as requests are handled by different servers in the cluster.

Method	Path	Produces
`GET`	`/coordinate/datacenters`	`application/json`

The table below shows this endpoint's support for blocking queries, consistency modes, agent caching, and required ACLs.

Blocking Queries	Consistency Modes	Agent Caching	ACL Required
`NO`	`none`	`none`	`none`

The corresponding CLI command is consul rtt -wan.

Sample Request

$ curl \
    http://127.0.0.1:8500/v1/coordinate/datacenters

Sample Response

[
  {
    "Datacenter": "dc1",
    "AreaID": "WAN",
    "Coordinates": [
      {
        "Node": "agent-one",
        "Coord": {
          "Adjustment": 0,
          "Error": 1.5,
          "Height": 0,
          "Vec": [0, 0, 0, 0, 0, 0, 0, 0]
        }
      }
    ]
  }
]

In Consul Enterprise, this will include coordinates for user-added network areas as well, as indicated by the AreaID. Coordinates are only compatible within the same area.

Read LAN Coordinates for all nodes

This endpoint returns the LAN network coordinates for all nodes in a given datacenter.

The HTTP response includes the X-Consul-Results-Filtered-By-ACLs: true header if the response array excludes results due to ACL policy configuration. Refer to the HTTP API documentation for more information.

Method	Path	Produces
`GET`	`/coordinate/nodes`	`application/json`

The table below shows this endpoint's support for blocking queries, consistency modes, agent caching, and required ACLs.

Blocking Queries	Consistency Modes	Agent Caching	ACL Required
`YES`	`all`	`none`	`node:read`

The corresponding CLI command is consul rtt.

Parameters

dc (string: "") - Specifies the datacenter to query. This will default to the datacenter of the agent being queried. This is specified as part of the URL as a query parameter.
segment (string: "") Enterprise - Specifies the segment to list members for. If left blank, this will query for the default segment when connecting to a server and the agent's own segment when connecting to a client (clients can only be part of one network segment). When querying a server, setting this to the special string _all will show members in all segments.

Sample Request

$ curl \
    http://127.0.0.1:8500/v1/coordinate/nodes

Sample Response

[
  {
    "Node": "agent-one",
    "Segment": "",
    "Coord": {
      "Adjustment": 0,
      "Error": 1.5,
      "Height": 0,
      "Vec": [0, 0, 0, 0, 0, 0, 0, 0]
    }
  }
]

In Consul Enterprise, this may include multiple coordinates for the same node, each marked with a different Segment. Coordinates are only compatible within the same segment.

Read LAN Coordinates for a node

This endpoint returns the LAN network coordinates for the given node.

Method	Path	Produces
`GET`	`/coordinate/node/:node`	`application/json`

The table below shows this endpoint's support for blocking queries, consistency modes, agent caching, and required ACLs.

Blocking Queries	Consistency Modes	Agent Caching	ACL Required
`YES`	`all`	`none`	`node:read`

Parameters

dc (string: "") - Specifies the datacenter to query. This will default to the datacenter of the agent being queried. This is specified as part of the URL as a query parameter.
segment (string: "") Enterprise - Specifies the segment to list members for. If left blank, this will query for the default segment when connecting to a server and the agent's own segment when connecting to a client (clients can only be part of one network segment). When querying a server, setting this to the special string _all will show members in all segments.

Sample Request

$ curl \
    http://127.0.0.1:8500/v1/coordinate/node/agent-one

Sample Response

[
  {
    "Node": "agent-one",
    "Segment": "",
    "Coord": {
      "Adjustment": 0,
      "Error": 1.5,
      "Height": 0,
      "Vec": [0, 0, 0, 0, 0, 0, 0, 0]
    }
  }
]

In Consul Enterprise, this may include multiple coordinates for the same node, each marked with a different Segment. Coordinates are only compatible within the same segment.

Update LAN Coordinates for a node

This endpoint updates the LAN network coordinates for a node in a given datacenter.

Method	Path	Produces
`PUT`	`/coordinate/update`	`application/json`

The table below shows this endpoint's support for blocking queries, consistency modes, agent caching, and required ACLs.

Blocking Queries	Consistency Modes	Agent Caching	ACL Required
`NO`	`none`	`none`	`node:write`

Parameters

dc (string: "") - Specifies the datacenter to query. This will default to the datacenter of the agent being queried. This is specified as part of the URL as a query parameter.

Sample Payload

{
  "Node": "agent-one",
  "Segment": "",
  "Coord": {
    "Adjustment": 0,
    "Error": 1.5,
    "Height": 0,
    "Vec": [0, 0, 0, 0, 0, 0, 0, 0]
  }
}

Sample Request

$ curl \
    --request PUT \
    --data @payload.json \
    http://127.0.0.1:8500/v1/coordinate/update