Use systemctl list-unit-files --type=service --state=enabled to get a list of services that will automatically start.
E.g.:
user@server:~$ systemctl list-unit-files --type=service --state=enabled UNIT FILE STATE VENDOR PRESET accounts-daemon.service enabled enabled apparmor.service enabled enabled ... [email protected] enabled enabled ... iscsi.service enabled enabled ... mysql.service enabled enabled mysqld.service enabled enabled ... php7.4-fpm.service enabled enabled php8.1-fpm.service enabled enabled ... webmin.service enabled enabled 74 unit files listed.
Why we started this exercise is saw on LibreNMS that both 7.4 and 8.1 of PHP-FPM is running and this causes problems as just 8.1 should be running. Next, we do this to fix the problem:
user@server:~$ sudo systemctl disable php7.4-fpm.service [sudo] password for user: Synchronizing state of php7.4-fpm.service with SysV service script with /lib/systemd/systemd-sysv-install. Executing: /lib/systemd/systemd-sysv-install disable php7.4-fpm Removed /etc/systemd/system/multi-user.target.wants/php7.4-fpm.service.
Next we can start the right FPM:
user@server:~$ /etc/init.d/php8.1-fpm status ● php8.1-fpm.service - The PHP 8.1 FastCGI Process Manager Loaded: loaded (/lib/systemd/system/php8.1-fpm.service; enabled; vendor preset: enabled) Active: active (running) since Wed 2025-01-08 10:21:32 SAST; 2min 0s ago Docs: man:php-fpm8.1(8) Main PID: 1769498 (php-fpm8.1) Status: "Processes active: 0, idle: 2, Requests: 0, slow: 0, Traffic: 0req/sec" Tasks: 3 (limit: 4594) Memory: 15.5M CGroup: /system.slice/php8.1-fpm.service ├─1769498 php-fpm: master process (/etc/php/8.1/fpm/php-fpm.conf) ├─1769506 php-fpm: pool librenms └─1769507 php-fpm: pool librenms Jan 08 10:21:32 nms systemd[1]: Starting The PHP 8.1 FastCGI Process Manager... Jan 08 10:21:32 nms systemd[1]: Started The PHP 8.1 FastCGI Process Manager.