Using nginx & PHP-FPM with Couchbase – The How, and the Why

The article addresses the challenges faced by users employing the Couchbase PHP SDK with nginx and PHP-FPM, particularly concerning the management of connections between PHP child processes and Couchbase. It explains that FPM often results in a surplus of Couchbase connections, as many PHP processes run concurrently, leading to inefficiencies and performance issues. The primary concern is the inability of multiple FPM processes to share a single Couchbase connection, which escalates the number of connections needed and results in costly teardown and restart cycles when process limits are reached. To alleviate these challenges, the article suggests using the Couchbase Configuration Cache available in the PHP SDK v1.1.5+, which reduces the need for constant configuration queries by caching cluster topology information. Additionally, it advises adjusting the FPM configuration by lowering the number of max_children and increasing max_requests to enhance resource efficiency and minimize the recreation of client objects, ultimately optimizing the performance of the PHP and Couchbase setup.

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