Linux, Open Source and Web 2.0

Mac OS 10.6.5 + apachectl: /usr/sbin/apachectl: line 82: ulimit: open files: cannot modify limit: Invalid argument

After the upgrade to Mac OS 10.6.5 a bug seem to have snuck in where apachectl tries to re-set ulimit to unlimited. The error appears as such:

/usr/sbin/apachectl: line 82: ulimit: open files: cannot modify limit: Invalid argument

While apachectl was working flawless before the upgrade to Mac OS 10.6.5, I suspected the two were related. After a quick search into what the update entailed, I found that Apple upgraded to Apache 2.2.15, which in turn patched a number of vulnerabilities. As it turned out, one of those changes broke the apachectl script.

Referring to line 82 of apachectl, the shell script was referring to the ULIMIT_MAX_FILES variable that was trying to set to unlimited, which read:

ULIMIT_MAX_FILES="ulimit -S -n `ulimit -H -n`"

Changing the line as follows fixed the problem:

ULIMIT_MAX_FILES="ulimit -S -n 1024"

Should you be running a high amount of vhosts or do some testing that requires a significant amount of file descriptors, set this number higher accordingly.