OpenSearch/x-pack/docs/en/rest-api/security/clear-cache.asciidoc

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[role="xpack"]
[[security-api-clear-cache]]
2018-12-20 13:23:28 -05:00
=== Clear cache API
++++
<titleabbrev>Clear cache</titleabbrev>
++++
Evicts users from the user cache. You can completely clear
the cache or evict specific users.
[[security-api-clear-request]]
==== {api-request-title}
`POST /_security/realm/<realms>/_clear_cache` +
`POST /_security/realm/<realms>/_clear_cache?usernames=<usernames>`
[[security-api-clear-desc]]
==== {api-description-title}
User credentials are cached in memory on each node to avoid connecting to a
remote authentication service or hitting the disk for every incoming request.
There are realm settings that you can use to configure the user cache. For more
information, see
{stack-ov}/controlling-user-cache.html[Controlling the user cache].
To evict roles from the role cache, see the
<<security-api-clear-role-cache,Clear roles cache API>>.
[[security-api-clear-path-params]]
==== {api-path-parms-title}
`realms`::
(Required, list) A comma-separated list of the realms to clear.
`usernames`::
(Optional, list) A comma-separated list of the users to clear from the cache.
If you do not specify this parameter, the API evicts all users from the user
cache.
[[security-api-clear-example]]
==== {api-examples-title}
For example, to evict all users cached by the `file` realm:
[source,console]
--------------------------------------------------
POST /_security/realm/default_file/_clear_cache
--------------------------------------------------
To evict selected users, specify the `usernames` parameter:
[source,console]
--------------------------------------------------
POST /_security/realm/default_file/_clear_cache?usernames=rdeniro,alpacino
--------------------------------------------------
To clear the caches for multiple realms, specify the realms as a comma-delimited
list:
[source,console]
------------------------------------------------------------
POST /_security/realm/default_file,ldap1/_clear_cache
------------------------------------------------------------