46 lines
1.8 KiB
Plaintext
46 lines
1.8 KiB
Plaintext
[role="xpack"]
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[[controlling-user-cache]]
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=== Controlling the user cache
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User credentials are cached in memory on each node to avoid connecting to a
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remote authentication service or hitting the disk for every incoming request.
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You can configure characteristics of the user cache with the `cache.ttl`,
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`cache.max_users`, and `cache.hash_algo` realm settings.
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NOTE: JWT realms use `jwt.cache.ttl` and `jwt.cache.size` realm settings.
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NOTE: PKI and JWT realms do not cache user credentials, but do cache the resolved user
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object to avoid unnecessarily needing to perform role mapping on each request.
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The cached user credentials are hashed in memory. By default, the {es}
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{security-features} use a salted `sha-256` hash algorithm. You can use a
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different hashing algorithm by setting the `cache.hash_algo` realm settings. See
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<<hashing-settings>>.
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[[cache-eviction-api]]
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==== Evicting users from the cache
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You can use the <<security-api-clear-cache,clear cache API>> to force
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the eviction of cached users . For example, the following request evicts all
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users from the `ad1` realm:
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[source,js]
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------------------------------------------------------------
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$ curl -XPOST 'http://localhost:9200/_security/realm/ad1/_clear_cache'
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------------------------------------------------------------
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To clear the cache for multiple realms, specify the realms as a comma-separated
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list:
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[source,js]
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------------------------------------------------------------
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$ curl -XPOST 'http://localhost:9200/_security/realm/ad1,ad2/_clear_cache'
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------------------------------------------------------------
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You can also evict specific users:
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[source, java]
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------------------------------------------------------------
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$ curl -XPOST 'http://localhost:9200/_security/realm/ad1/_clear_cache?usernames=rdeniro,alpacino'
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------------------------------------------------------------
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