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Apache will not restart!

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SYMPTOMS
  • Apache will not restart
  • error.log reports:
    • No space left on device: mod_rewrite: could not create rewrite_log_lock
    • No space left on device: Couldn't create accept lock
  • There is adequate disk space and memory available
SOLUTION
There are orphaned semaphore-arrays left on the system owned by the Apache/Httpd user and Apache is unable to create new semaphores.

1. The following command sequence will remove the semaphores:
[Gentoo/CentOS/Fedora]

ipcs -s | grep apache | gawk '{ print $2 }' | xargs -n 1 ipcrm sem

[Debian]

ipcs -s | grep www-data | gawk '{ print $2 }' | xargs -n 1 ipcrm sem

[Trixbox/PIAF/Elastix/AsteriskNow, other PBX-based servers]

ipcs -s | grep asterisk | gawk '{ print $2 }' | xargs -n 1 ipcrm sem

Perl alternative (found not to work in all cases)

ipcs -s | grep apache | perl -e 'while () { @a=split(/\s+/); print `ipcrm sem $a[1]`}'

2. Restart Apache according to your distribution's init script:
[Gentoo/Debian]

/etc/init.d/apache2 restart

[Fedora/Centos]

/etc/init.d/httpd restart



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