CODEWITHSUNDEEP
nginxfile-descriptor
pablo
pablo

Reputation: 2809

Nginx File descriptor limit

How can I increase the file descriptors limit in nginx?

There are several ways to increase file descriptors:

  1. Edit /etc/security/limits.conf and set nofile soft and hard limits for the nginx user.

  2. Set $ULIMIT in /etc/default/nginx. The nginx init.d script set ulimit $ULIMIT https://gist.github.com/aganov/1121022#file-nginx-L43

  3. Set worker_rlimit_nofile in nginx.conf http://wiki.nginx.org/NginxHttpMainModule#worker_rlimit_nofile

Does setting limits in limits.conf affect nginx when started using init.d script on boot?

Do I have to use ulimit $ULIMIT in the init script or can worker_rlimit_nofile be used instead?

When using ulimit $ULIMIT in the init script, do I still need to use worker_rlimit_nofile to set limits for each worker?

Thanks

Upvotes: 5

Views: 7973

Answers (2)

Renato Silva Das Neves
Renato Silva Das Neves

Reputation: 281

Discussing each item:

1) /etc/security/limits.conf is only processed by pam_limits. Processes started from init.d generally do not utilize pam_limits. It's needed to set the ulimit at init level, in the service script, for example.

2) The default nginx init script doesn't have this setting (at least for Official Red Hat/CentOS packages). But changing this init script is a valid way, although it's not recommended.

3) worker_rlimit_nofile works only at process level, it's limited to the system's hard limit (ulimit -Hn). It serves to dynamically change the maximum file descriptors the nginx process can handle, which is typically defined with the system's soft limit.

Upvotes: 3

pablo
pablo

Reputation: 2809

The correct way to increase the limit is by setting worker_rlimit_nofile.

Upvotes: 3

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