203 lines
6.3 KiB
Markdown
203 lines
6.3 KiB
Markdown
---
|
|
layout: "docs"
|
|
page_title: "Sessions (HTTP)"
|
|
sidebar_current: "docs-agent-http-sessions"
|
|
description: >
|
|
The Session endpoints are used to create, destroy, and query sessions.
|
|
---
|
|
|
|
# Session HTTP Endpoint
|
|
|
|
The Session endpoints are used to create, destroy, and query sessions.
|
|
The following endpoints are supported:
|
|
|
|
* [`/v1/session/create`](#session_create): Creates a new session
|
|
* [`/v1/session/destroy/<session>`](#session_destroy): Destroys a given session
|
|
* [`/v1/session/info/<session>`](#session_info): Queries a given session
|
|
* [`/v1/session/node/<node>`](#session_node): Lists sessions belonging to a node
|
|
* [`/v1/session/list`](#session_list): Lists all active sessions
|
|
* [`/v1/session/renew`](#session_renew): Renews a TTL-based session
|
|
|
|
All of the read session endpoints support blocking queries and all consistency modes.
|
|
|
|
### <a name="session_create"></a> /v1/session/create
|
|
|
|
The create endpoint is used to initialize a new session.
|
|
There is more documentation on sessions [here](/docs/internals/sessions.html).
|
|
Sessions must be associated with a node and may be associated with any number of checks.
|
|
|
|
The create endpoint expects a JSON request body to be `PUT`. The request
|
|
body must look like:
|
|
|
|
```javascript
|
|
{
|
|
"LockDelay": "15s",
|
|
"Name": "my-service-lock",
|
|
"Node": "foobar",
|
|
"Checks": ["a", "b", "c"],
|
|
"Behavior": "release",
|
|
"TTL": "0s"
|
|
}
|
|
```
|
|
|
|
None of the fields are mandatory, and in fact no body needs to be PUT
|
|
if the defaults are to be used.
|
|
|
|
By default, the agent's local datacenter is used; another datacenter
|
|
can be specified using the `?dc=` query parameter. However, it is not recommended
|
|
to use cross-datacenter sessions.
|
|
|
|
`LockDelay` can be specified as a duration string using an `s` suffix for
|
|
seconds. The default is 15s.
|
|
|
|
`Node` must refer to a node that is already registered, if specified. By default,
|
|
the agent's own node name is used.
|
|
|
|
`Name` can be used to provide a human-readable name for the Session.
|
|
|
|
`Checks` is used to provide a list of associated health checks. It is highly recommended
|
|
that, if you override this list, you include the default `serfHealth`.
|
|
|
|
`Behavior` can be set to either `release` or `delete`. This controls
|
|
the behavior when a session is invalidated. By default, this is `release`,
|
|
causing any locks that are held to be released. Changing this to `delete`
|
|
causes any locks that are held to be deleted. `delete` is useful for creating ephemeral
|
|
key/value entries.
|
|
|
|
The `TTL` field is a duration string, and like `LockDelay` it can use `s` as
|
|
a suffix for seconds. If specified, it must be between 10s and 86400s currently.
|
|
When 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 during a leader election,
|
|
sessions may not be reaped for up to double this TTL, so long TTL values (>1 hour)
|
|
should be avoided. See the [session internals page](/docs/internals/sessions.html)
|
|
for more documentation of this feature.
|
|
|
|
The return code is 200 on success and returns the ID of the created session:
|
|
|
|
```javascript
|
|
{
|
|
"ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e"
|
|
}
|
|
```
|
|
|
|
### <a name="session_destroy"></a> /v1/session/destroy/\<session\>
|
|
|
|
The destroy endpoint is hit with a `PUT` and destroys the given session.
|
|
By default, the local datacenter is used, but the `?dc=` query parameter
|
|
can be used to specify the datacenter.
|
|
|
|
The session being destroyed must be provided on the path.
|
|
|
|
The return code is 200 on success.
|
|
|
|
### <a name="session_info"></a> /v1/session/info/\<session\>
|
|
|
|
This endpoint is hit with a `GET` and returns the requested session information
|
|
within a given datacenter. By default, the datacenter of the agent is queried;
|
|
however, the `dc` can be provided using the `?dc=` query parameter.
|
|
The session being queried must be provided on the path.
|
|
|
|
It returns a JSON body like this:
|
|
|
|
```javascript
|
|
[
|
|
{
|
|
"LockDelay": 1.5e+10,
|
|
"Checks": [
|
|
"serfHealth"
|
|
],
|
|
"Node": "foobar",
|
|
"ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
|
|
"CreateIndex": 1086449
|
|
}
|
|
]
|
|
```
|
|
|
|
If the session is not found, null is returned instead of a JSON list.
|
|
This endpoint supports blocking queries and all consistency modes.
|
|
|
|
### <a name="session_node"></a> /v1/session/node/\<node\>
|
|
|
|
This endpoint is hit with a `GET` and returns the active sessions
|
|
for a given node and datacenter. By default, the datacenter of the agent is queried;
|
|
however, the `dc` can be provided using the `?dc=` query parameter.
|
|
|
|
The node being queried must be provided on the path.
|
|
|
|
It returns a JSON body like this:
|
|
|
|
```javascript
|
|
[
|
|
{
|
|
"LockDelay": 1.5e+10,
|
|
"Checks": [
|
|
"serfHealth"
|
|
],
|
|
"Node": "foobar",
|
|
"ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
|
|
"CreateIndex": 1086449
|
|
},
|
|
...
|
|
]
|
|
```
|
|
|
|
This endpoint supports blocking queries and all consistency modes.
|
|
|
|
### <a name="session_list"></a> /v1/session/list
|
|
|
|
This endpoint is hit with a `GET` and returns the active sessions
|
|
for a given datacenter. By default, the datacenter of the agent is queried;
|
|
however, the `dc` can be provided using the `?dc=` query parameter.
|
|
|
|
It returns a JSON body like this:
|
|
|
|
```javascript
|
|
[
|
|
{
|
|
"LockDelay": 1.5e+10,
|
|
"Checks": [
|
|
"serfHealth"
|
|
],
|
|
"Node": "foobar",
|
|
"ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
|
|
"CreateIndex": 1086449
|
|
},
|
|
...
|
|
]
|
|
```
|
|
|
|
This endpoint supports blocking queries and all consistency modes.
|
|
|
|
### <a name="session_renew"></a> /v1/session/renew/\<session\>
|
|
|
|
The renew endpoint is hit with a `PUT` and renews the given session.
|
|
This is used with sessions that have a TTL, and it extends the
|
|
expiration by the TTL. By default, the local datacenter is used, but the `?dc=`
|
|
query parameter can be used to specify the datacenter.
|
|
|
|
The session being renewed must be provided on the path.
|
|
|
|
The return code is 200 on success. The response JSON body looks like this:
|
|
|
|
```javascript
|
|
[
|
|
{
|
|
"LockDelay": 1.5e+10,
|
|
"Checks": [
|
|
"serfHealth"
|
|
],
|
|
"Node": "foobar",
|
|
"ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
|
|
"CreateIndex": 1086449
|
|
"Behavior": "release",
|
|
"TTL": "15s"
|
|
}
|
|
]
|
|
```
|
|
|
|
The response body includes the current session.
|
|
|
|
-> **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.
|
|
|