Merhaba turansonkaya,
journalctl -xe ile hata çıktısını detaylı olarak görüntüleyip hataya göre aksiyon almanız daha mantıklıdır.
Profesyonel sunucu hata desteği arar iseniz önerebiliriz;
https://www.cliaweb.com/sunucu-optimizasyon.html
İyi çalışmalar dileriz.
Şu şekilde bir hata çıktısı alıyorum;
░░ An ExecStart= process belonging to unit php7.4-fpm.service has exited.
░░
░░ The process' exit code is 'exited' and its exit status is 70.
Jan 28 15:59:31 app systemd[1]: php7.4-fpm.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░
░░ The unit php7.4-fpm.service has entered the 'failed' state with result 'exit-code'.
Jan 28 15:59:31 app systemd[1]: Failed to start The PHP 7.4 FastCGI Process Manager.
░░ Subject: A start job for unit php7.4-fpm.service has failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░
░░ A start job for unit php7.4-fpm.service has finished with a failure.
░░
░░ The job identifier is 19751 and the job result is failed.