Sometimes apache goes crazy and eats all my memory and swap, but I don't know how to find out which web app is the causing it.

ps gives me this output for the process; "Uninterruptible sleep (usually IO)"

www-data  1526  0.1 78.9 14928852 3191628 ?    D    Oct17   6:45 /usr/sbin/apache2 -k start

I suspect Ruby+Redmine, but I want to be sure


Make sure you have mod_status.so loaded within your apache modules then look for/add the above to your httpd.conf:

# Uncomment the following lines to enable mod_status support:
ExtendedStatus On

<Location /server-status>
SetHandler server-status

Order Deny,Allow
Deny from all
Allow from YOUR_IP_HERE

This will allow you to see all the pages being used load domain within your http server.

To access it use http://your_ip/server-status and only the ip defined at Allow from YOUR_IP_HERE will be able to view it.

  • 1
    Also I suggest to use Allow from localhost, so later it is possible to check that info via lynx http://localhost/server-status in console.
    – Andron
    Feb 21 '17 at 12:00
  • In Apache 2.4 it's Require all granted instead of Order ... Feb 11 '20 at 11:11

An lsof -p will show you what file handle it is waiting for. Also strace -p and ltrace -p might be handy to try to debug it.

  • Both very good answers :)
    – Joernsn
    Oct 25 '10 at 8:05

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