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Start with a working deployment and measure open files, connections, memory, CPU, latency and database-pool pressure under representative load. Check the limits of the service process<\/strong>, not only your interactive shell.<\/p>\n

For systemd, inspect systemctl show zotonic -p LimitNOFILE -p TasksMax<\/code> and the unit's configured user and environment. If the process is approaching its descriptor limit, set a reviewed LimitNOFILE=<\/code> in a service override, reload systemd, restart during a maintenance window and verify the new process limit.<\/p>\n

Do not copy a universal file-limit number or size connection-tracking tables as a fixed fraction of memory. Check whether conntrack is on the traffic path, its observed occupancy, and the host's memory budget first. Aggressive timeout changes can break long-lived MQTT\/WebSocket connections.<\/p>\n

Change one setting at a time, record the previous value, load-test again, and keep a rollback procedure. A higher limit cannot repair a connection leak or an undersized database.<\/p>"}},"category_id":{"id":317,"is_a":["meta","category"],"name":"developerguide","title":"Developer guide","uri":"https:\/\/zotonic.com\/id\/developerguide"},"content_group_id":{"id":339,"is_a":["meta","content_group"],"name":"default_content_group","title":{"_type":"trans","tr":{"en":"Default Content Group"}},"uri":"https:\/\/zotonic.com\/id\/default_content_group"},"created":"2020-05-30T05:47:18Z","creator_id":{"id":336,"is_a":["person","robot"],"name":"gitbot","title":"Git","uri":"https:\/\/zotonic.com\/id\/336"},"doc_editorial_bundle":true,"doc_editorial_edges":{"hasreference":[3004,3078],"subject":[2554,2566,2603,2689]},"github_url":"https:\/\/github.com\/zotonic\/zotonic\/tree\/master\/doc\/developer-guide\/deployment\/server-configuration.rst","is_authoritative":true,"is_dependent":false,"is_featured":false,"is_protected":false,"is_published":true,"is_unfindable":false,"language":["en"],"modified":"2026-10-07T11:13:57Z","modifier_id":{"id":1,"is_a":["person"],"name":"administrator","title":"Site Administrator","uri":"https:\/\/zotonic.com\/id\/1"},"name":"doc_developerguide_deployment_server_configuration","pivot_geocode":null,"pivot_location_lat":null,"pivot_location_lng":null,"privacy":0,"publication_end":"9999-06-01T00:00:00Z","publication_start":"2022-02-15T10:01:44Z","slug":"tune-server-limits-from-measured-load","summary":{"_type":"trans","tr":{"en":"Check actual limits and workload before changing operating-system settings."}},"title":{"_type":"trans","tr":{"en":"Tune server limits from measured load"}},"title_slug":{"_type":"trans","tr":{"en":"tune-server-limits-from-measured-load"}},"tz":"UTC","uri":null,"version":33,"visible_for":0},"uri":"https:\/\/zotonic.com\/id\/1319","uri_template":"https:\/\/zotonic.com\/id\/:id","websub":{"hub":"https:\/\/zotonic.com\/.zotonic\/websub","topic":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/1319"}},"status":"ok"}