198 lines
6.3 KiB
Markdown
198 lines
6.3 KiB
Markdown
---
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layout: "docs"
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page_title: "Sessions (HTTP)"
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sidebar_current: "docs-agent-http-sessions"
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description: >
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The Session endpoints are used to create, destroy and query sessions.
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---
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# Session HTTP Endpoint
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The Session endpoints are used to create, destroy and query sessions.
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The following endpoints are supported:
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* [`/v1/session/create`](#session_create): Creates a new session
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* [`/v1/session/destroy/<session>`](#session_destroy): Destroys a given session
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* [`/v1/session/info/<session>`](#session_info): Queries a given session
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* [`/v1/session/node/<node>`](#session_node): Lists sessions belonging to a node
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* [`/v1/session/list`](#session_list): Lists all the active sessions
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* [`/v1/session/renew`](#session_renew): Renew a TTL based session
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All of the read session endpoints supports blocking queries and all consistency modes.
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### <a name="session_create"></a> /v1/session/create
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The create endpoint is used to initialize a new session.
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There is more documentation on sessions [here](/docs/internals/sessions.html).
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Sessions must be associated with a node, and optionally any number of checks.
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By default, the agent uses it's own node name, and provides the "serfHealth"
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check, along with a 15 second lock delay.
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By default, the agent's local datacenter is used, but another datacenter
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can be specified using the "?dc=" query parameter. It is not recommended
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to use cross-region sessions.
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The create endpoint expects a JSON request body to be PUT. The request
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body must look like:
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```javascript
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{
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"LockDelay": "15s",
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"Name": "my-service-lock",
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"Node": "foobar",
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"Checks": ["a", "b", "c"],
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"Behavior": "release",
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"TTL": "0s"
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}
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```
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None of the fields are mandatory, and in fact no body needs to be PUT
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if the defaults are to be used. The `LockDelay` field can be specified
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as a duration string using a "s" suffix for seconds. It can also be a numeric
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value. Small values are treated as seconds, and otherwise it is provided with
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nanosecond granularity.
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The `Node` field must refer to a node that is already registered. By default,
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the agent will use it's own name. The `Name` field can be used to provide a human
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readable name for the Session. The `Checks` field is used to provide
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a list of associated health checks. By default the "serfHealth" check is provided.
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It is highly recommended that if you override this list, you include that check.
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The `Behavior` field can be set to either "release" or "delete". This controls
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the behavior when a session is invalidated. By default this is "release", and
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this causes any locks that are held to be released. Changing this to "delete"
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causes any locks that are held to be deleted. This is useful to create ephemeral
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key/value entries.
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The `TTL` field is a duration string, and like `LockDelay` it can use "s" as
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a suffix for seconds. If specified, it must be between 10s and 3600s currently.
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When provided, the session is invalidated if it is not renewed before the TTL
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expires. See the [session internals page](/docs/internals/session.html) for more documentation.
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The return code is 200 on success, along with a body like:
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```javascript
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{
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"ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e"
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}
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```
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This is used to provide the ID of the newly created session.
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### <a name="session_destroy"></a> /v1/session/destroy/\<session\>
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The destroy endpoint is hit with a PUT and destroys the given session.
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By default the local datacenter is used, but the "?dc=" query parameter
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can be used to specify the datacenter. The session being destroyed must
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be provided after the slash.
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The return code is 200 on success.
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### <a name="session_info"></a> /v1/session/info/\<session\>
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This endpoint is hit with a GET and returns the session information
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by ID within a given datacenter. By default the datacenter of the agent is queried,
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however the dc can be provided using the "?dc=" query parameter.
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The session being queried must be provided after the slash.
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It returns a JSON body like this:
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```javascript
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[
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{
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"LockDelay": 1.5e+10,
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"Checks": [
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"serfHealth"
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],
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"Node": "foobar",
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"ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
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"CreateIndex": 1086449
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}
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]
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```
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If the session is not found, null is returned instead of a JSON list.
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This endpoint supports blocking queries and all consistency modes.
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### <a name="session_node"></a> /v1/session/node/\<node\>
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This endpoint is hit with a GET and returns the active sessions
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for a given node and datacenter. By default the datacenter of the agent is queried,
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however the dc can be provided using the "?dc=" query parameter.
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The node being queried must be provided after the slash.
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It returns a JSON body like this:
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```javascript
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[
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{
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"LockDelay": 1.5e+10,
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"Checks": [
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"serfHealth"
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],
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"Node": "foobar",
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"ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
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"CreateIndex": 1086449
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},
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...
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]
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```
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This endpoint supports blocking queries and all consistency modes.
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### <a name="session_list"></a> /v1/session/list
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This endpoint is hit with a GET and returns the active sessions
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for a given datacenter. By default the datacenter of the agent is queried,
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however the dc can be provided using the "?dc=" query parameter.
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It returns a JSON body like this:
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```javascript
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[
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{
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"LockDelay": 1.5e+10,
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"Checks": [
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"serfHealth"
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],
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"Node": "foobar",
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"ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
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"CreateIndex": 1086449
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},
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...
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]
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```
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This endpoint supports blocking queries and all consistency modes.
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### <a name="session_renew"></a> /v1/session/renew/\<session\>
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The renew endpoint is hit with a PUT and renews the given session.
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This is used with sessions that have a TTL set, and it extends the
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expiration by the TTL. By default the local datacenter is used, but the "?dc="
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query parameter can be used to specify the datacenter. The session being renewed
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must be provided after the slash.
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The return code is 200 on success and a JSON body like this:
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```javascript
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[
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{
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"LockDelay": 1.5e+10,
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"Checks": [
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"serfHealth"
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],
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"Node": "foobar",
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"ID": "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
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"CreateIndex": 1086449
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"Behavior": "release",
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"TTL": "15s"
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}
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]
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```
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The response body includes the current session.
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Consul MAY return a TTL value higher than the one specified during session creation.
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This indicates the server is under high load and is requesting clients renew less
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often.
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