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122 lines
2.8 KiB
Markdown
122 lines
2.8 KiB
Markdown
---
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title: Socket Activation with Popular Daemons
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category: Manuals and Documentation for Users and Administrators
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layout: default
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SPDX-License-Identifier: LGPL-2.1-or-later
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---
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## nginx
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nginx includes an undocumented, internal socket-passing mechanism based on the `NGINX` environmental variable.
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It uses this to perform reloads without having to close and reopen its sockets, but it's also useful for socket activation.
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**/etc/nginx/my-nginx.conf**
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```
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http {
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server {
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listen [::]:80 ipv6only=on;
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listen 80;
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}
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}
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```
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**/etc/systemd/system/my-nginx.service**
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```
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[Service]
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User=nginx
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Group=nginx
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Environment=NGINX=3:4;
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ExecStart=/usr/sbin/nginx -c/etc/nginx/my-nginx.conf
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PrivateNetwork=true
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```
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**/etc/systemd/system/my-nginx.socket**
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```
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[Unit]
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After=network.target
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Requires=network.target
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[Socket]
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ListenStream=80
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ListenStream=0.0.0.0:80
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BindIPv6Only=ipv6-only
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[Install]
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WantedBy=sockets.target
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```
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## PHP-FPM
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Like nginx, PHP-FPM includes a socket-passing mechanism an environmental variable.
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In PHP-FPM's case, it's `FPM_SOCKETS`.
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This configuration is possible with any web server that supports FastCGI (like Apache, Lighttpd, or nginx).
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The web server does not need to know anything special about the socket; use a normal PHP-FPM configuration.
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Paths are based on a Fedora 19 system.
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### First, the configuration files
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**/etc/php-fpm.d/my-php-fpm-pool.conf**
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```
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[global]
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pid = /run/my-php-fpm-pool.pid ; Not really used by anything with daemonize = no, but needs to be writable.
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error_log = syslog ; Will aggregate to the service's systemd journal.
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daemonize = no ; systemd handles the forking.
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[www]
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listen = /var/run/my-php-fpm-pool.socket ; Must match systemd socket unit.
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user = nginx ; Ignored but required.
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group = nginx ; Ignored but required.
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pm = static
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pm.max_children = 10
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slowlog = syslog
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```
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**/etc/systemd/system/my-php-fpm-pool.service**
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```
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[Service]
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User=nginx
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Group=nginx
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Environment="FPM_SOCKETS=/var/run/my-php-fpm-pool.socket=3"
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ExecStart=/usr/sbin/php-fpm --fpm-config=/etc/php-fpm.d/my-php-fpm-pool.conf
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KillMode=process
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```
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**/etc/systemd/system/my-php-fpm-pool.socket**
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```
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[Socket]
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ListenStream=/var/run/my-php-fpm-pool.socket
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[Install]
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WantedBy=sockets.target
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```
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### Second, the setup commands
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```sh
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sudo systemctl --system daemon-reload
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sudo systemctl start my-php-fpm-pool.socket
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sudo systemctl enable my-php-fpm-pool.socket
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```
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After accessing the web server, the service should be running.
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```sh
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sudo systemctl status my-php-fpm-pool.service
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```
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It's possible to shut down the service and re-activate it using the web browser, too.
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It's necessary to stop and start the socket to reset some shutdown PHP-FPM does that otherwise breaks reactivation.
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```sh
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sudo systemctl stop my-php-fpm-pool.socket my-php-fpm-pool.service
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sudo systemctl start my-php-fpm-pool.socket
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```
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