====== Setting NGINX File Descriptor Limits ======

Configure the ''www-data'' user to have 8192 open files. This should match or exceed the ''worker_rlimit_nofile'' setting in NGINX config.

===== 1. System Limits Configuration =====

Edit ''/etc/security/limits.d/10-nofile.conf'':

<code>
www-data soft nofile 8192
www-data hard nofile 8192
</code>

**Note:** Files in ''/etc/security/limits.d/'' are processed after ''/etc/security/limits.conf'' and are preferred for custom configurations.

===== 2. Systemd Service Override =====

Create the override directory and file:

<code bash>
mkdir -p /etc/systemd/system/nginx.service.d
</code>

Create ''/etc/systemd/system/nginx.service.d/override.conf'':

<code ini>
[Service]
LimitNOFILE=8192
</code>

Reload systemd:

<code bash>
systemctl daemon-reload
</code>

**Important:** For systemd-managed services, this override takes precedence over ''/etc/security/limits.d/'' settings.

===== 3. NGINX Configuration =====

Edit ''/etc/nginx/nginx.conf'' and add at the top level (outside any block):

<code nginx>
worker_rlimit_nofile 8192;
</code>