Упал apache, в 04:35:01
[Sun Aug 18 04:35:01 2013] [notice] SIGHUP received. Attempting to restart
[Sun Aug 18 04:35:01 2013] [notice] Digest: generating secret for digest authentication ...
[Sun Aug 18 04:35:01 2013] [notice] Digest: done
[Sun Aug 18 04:35:01 2013] [emerg] (28)No space left on device: mod_fcgid: Can't create global fcgid-pipe mutex
Пытаюсь включить
[Sun Aug 18 08:09:51 2013] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Sun Aug 18 08:09:51 2013] [notice] Digest: generating secret for digest authentication ...
[Sun Aug 18 08:09:51 2013] [notice] Digest: done
Configuration Failed
[Sun Aug 18 08:10:10 2013] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Sun Aug 18 08:10:10 2013] [notice] Digest: generating secret for digest authentication ...
[Sun Aug 18 08:10:10 2013] [notice] Digest: done
Configuration Failed
Далее перезагрузил VPS. Нормально запустился.
Позже нагуглил http://wiki.a-um.nl/index.php/rnd/Apache/NoSpaceLeftOnDevice:mod_fcgid?versio...
The problem turned-out to be the IPC/semaphore-table that had filled-up (or something)
http://poiuty.ru/img/ba340c17628cbaaaf9493dbf873b.png => RAM munin