auth_ldap_cache_enabled
Enables caching of LDAP authentication results in NGINX.
Description
The auth_ldap_cache_enabled directive allows NGINX to cache the results of LDAP authentication queries, which can significantly improve performance by reducing the number of requests made to the LDAP server for repeat authentication requests. When this feature is enabled, successful and unsuccessful authentication attempts are stored in memory for a specified duration. This means subsequent requests from the same user can bypass the LDAP server if the result of the previous authentication is still valid within the cache's expiration time.
In conjunction with this directive, administrators should manage the cache expiration time using the auth_ldap_cache_expiration_time directive, which defines how long an authentication result remains valid before being considered stale. Caching effectively balances the load on the LDAP server and optimizes response times for user authentication, particularly in environments with high user traffic or frequent access to protected resources. However, it's crucial to ensure that caching policies align with organizational security requirements, as cached results may expose stale information regarding user access privileges.
Additionally, if multiple LDAP servers are configured, caching behavior is influenced by the directive's context, allowing global settings that may impact all configured LDAP servers. Proper configuration and testing of this directive can lead to a more efficient and responsive authentication mechanism in NGINX setups handling LDAP integrations.
Config Example
http {
auth_ldap_cache_enabled on;
/* Other LDAP configuration settings */
}Ensure that the cache expiration time is configured appropriately; a too-long duration can lead to outdated authentication results.
When using multiple LDAP servers, ensure cache settings are consistently applied to avoid mismatches in authentication outcomes.