Took a trip to San Diego today while vacationing in Oceanside and decided to do some museum gazing on Balboa Park.
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Recently I’ve been fighting with memory consumption on my server and have been looking for ways that I can reduce the overall load. After some research I found that Apache opens up a file descriptor for each VHosts log file, and keeps this descriptor open all the time. So when I had a bunch of sites that I didn’t mind if their log files were combined, I did some work.
I verified that first, my /etc/apache2/apache2.conf file had a CustomLog entry for vhost_combined:
LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
Once this was confirmed I went into each of the config files in the sites-available directory and modified a single line:
CustomLog /var/log/apache2/groupofsites-access.log vhost_combined
Notice that I added that ‘vhost_combined’ to the end of this line, meaning that it will use the log format from above and for each vhost assigned to use this log file, only keep 1 file descriptor open instead of 6.
So far I’ve actually noticed a quicker response from my webserver as well as lower memory usage. Hopefully this helps you out as well!
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