»Session HTTP Endpoint

The /session endpoints create, destroy, and query sessions in Consul.

»Create Session

This endpoint initializes a new session. Sessions must be associated with a node and may be associated with any number of checks.

Method	Path	Produces
`PUT`	`/session/create`	`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`	`session:write`

»Parameters

ns (string: "")
Enterprise
- Specifies the namespace to query. If not provided, the namespace will be inferred from the request's ACL token, or will default to the default namespace. This is specified as part of the URL as a query parameter. Added in Consul 1.7.0.
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. Using this across datacenters is not recommended.
LockDelay (string: "15s") - Specifies the duration for the lock delay. This must be greater than 0.
Node (string: "<agent>") - Specifies the name of the node. This must refer to a node that is already registered.
Name (string: "") - Specifies a human-readable name for the session.
Checks (array<string>: nil) - specifies a list of associated health check IDs (commonly CheckID in API responses). It is highly recommended that, if you override this list, you include the default serfHealth.
Behavior (string: "release") - Controls the behavior to take when a session is invalidated. Valid values are:
- release - causes any locks that are held to be released
- delete - causes any locks that are held to be deleted
TTL (string: "") - Specifies the duration of a session (between 10s and 86400s). If provided, the session is invalidated if it is not renewed before the TTL expires. The lowest practical TTL should be used to keep the number of managed sessions low. When locks are forcibly expired, such as when following the leader election pattern in an application, sessions may not be reaped for up to double this TTL, so long TTL values (> 1 hour) should be avoided. Valid time units include "s", "m" and "h".

»Sample Payload

{
  "LockDelay": "15s",
  "Name": "my-service-lock",
  "Node": "foobar",
  "Checks": ["a", "b", "c"],
  "Behavior": "release",
  "TTL": "30s"
}

»Sample Request

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

»Sample Response

{
  "ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e"
}

ID - the ID of the created session

»Delete Session

This endpoint destroys the session with the given name. If the session UUID is malformed, an error is returned. If the session UUID does not exist or already expired, a 200 is still returned (the operation is idempotent).

Method	Path	Produces
`PUT`	`/session/destroy/:uuid`	`application/json`

Even though the Content-Type is application/json, the response is either a literal true or false, indicating of whether the destroy was successful.

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`	`session:write`

»Parameters

uuid (string: <required>) - Specifies the UUID of the session to destroy. This is required and is specified as part of the URL path.
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. Using this across datacenters is not recommended.
ns (string: "")
Enterprise
- Specifies the namespace to query. If not provided, the namespace will be inferred from the request's ACL token, or will default to the default namespace. This is specified as part of the URL as a query parameter. Added in Consul 1.7.0.

»Sample Request

$ curl \
    --request PUT \
    http://127.0.0.1:8500/v1/session/destroy/adf4238a-882b-9ddc-4a9d-5b6758e4159e

»Sample Response

true

»Read Session

This endpoint returns the requested session information.

Method	Path	Produces
`GET`	`/session/info/:uuid`	`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`	`session:read`

»Parameters

uuid (string: <required>) - Specifies the UUID of the session to read. This is required and is specified as part of the URL path.
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. Using this across datacenters is not recommended.
ns (string: "")
Enterprise
- Specifies the namespace to query. If not provided, the namespace will be inferred from the request's ACL token, or will default to the default namespace. This is specified as part of the URL as a query parameter. Added in Consul 1.7.0.

»Sample Request

$ curl \
    http://127.0.0.1:8500/v1/session/info/adf4238a-882b-9ddc-4a9d-5b6758e4159e

»Sample Response

[
  {
    "ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
    "Name": "test-session",
    "Node": "raja-laptop-02",
    "Checks": ["serfHealth"],
    "LockDelay": 1.5e10,
    "Behavior": "release",
    "TTL": "30s",
    "CreateIndex": 1086449,
    "ModifyIndex": 1086449
  }
]

If the session does not exist, an empty JSON list [] is returned.

»List Sessions for Node

This endpoint returns the active sessions for a given node.

Method	Path	Produces
`GET`	`/session/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`	`session:read`

»Parameters

node (string: <required>) - Specifies the name or ID of the node to query. This is required and is specified as part of the URL path.
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. Using this across datacenters is not recommended.
ns (string: "")
Enterprise
- Specifies the namespace to query. If not provided, the namespace will be inferred from the request's ACL token, or will default to the default namespace. This is specified as part of the URL as a query parameter The namespace may be specified as '*' and then results will be returned for all namespaces. Added in Consul 1.7.0.

»Sample Request

$ curl \
    http://127.0.0.1:8500/v1/session/node/node-abcd1234

»Sample Response

[
  {
    "ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
    "Name": "test-session",
    "Node": "raja-laptop-02",
    "Checks": ["serfHealth"],
    "LockDelay": 1.5e10,
    "Behavior": "release",
    "TTL": "30s",
    "CreateIndex": 1086449,
    "ModifyIndex": 1086449
  }
]

»List Sessions

This endpoint returns the list of active sessions.

Method	Path	Produces
`GET`	`/session/list`	`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`	`session: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. Using this across datacenters is not recommended.
ns (string: "")
Enterprise
- Specifies the namespace to query. If not provided, the namespace will be inferred from the request's ACL token, or will default to the default namespace. This is specified as part of the URL as a query parameter. The namespace may be specified as '*' and then results will be returned for all namespaces. Added in Consul 1.7.0.

»Sample Request

$ curl \
    http://127.0.0.1:8500/v1/session/list

»Sample Response

[
  {
    "ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
    "Name": "test-session",
    "Node": "raja-laptop-02",
    "Checks": ["serfHealth"],
    "LockDelay": 1.5e10,
    "Behavior": "release",
    "TTL": "30s",
    "CreateIndex": 1086449,
    "ModifyIndex": 1086449
  }
]

»Renew Session

This endpoint renews the given session. This is used with sessions that have a TTL, and it extends the expiration by the TTL.

Method	Path	Produces
`PUT`	`/session/renew/:uuid`	`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`	`session:write`

»Parameters

uuid (string: <required>) - Specifies the UUID of the session to renew. This is required and is specified as part of the URL path.
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. Using this across datacenters is not recommended.
ns (string: "")
Enterprise
- Specifies the namespace to query. If not provided, the namespace will be inferred from the request's ACL token, or will default to the default namespace. This is specified as part of the URL as a query parameter. Added in Consul 1.7.0.

»Sample Request

$ curl \
    --request PUT \
    http://127.0.0.1:8500/v1/session/renew/adf4238a-882b-9ddc-4a9d-5b6758e4159e

»Sample Response

[
  {
    "ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
    "Name": "test-session",
    "Node": "raja-laptop-02",
    "Checks": ["serfHealth"],
    "LockDelay": 1.5e10,
    "Behavior": "release",
    "TTL": "15s",
    "CreateIndex": 1086449,
    "ModifyIndex": 1086449
  }
]

Note: Consul may return a TTL value higher than the one specified during session creation. This indicates the server is under high load and is requesting clients renew less often.