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Get Stats

To get statistics, you'll need to potentially modify your Apache configuration. For Ubuntu, it's as easy as a2enmod status (and reload the server with service apache2 reload)

Cli

# Using wget isn't advised because you'll get html output 
wget http://localhost/server-status -O -
# Ubuntu
apache2ctl fullstatus
# Older/RedHat
apachectl fullstatus

Or you can edit /mods.enabled/status to get it from the browser. For a machine readable, condensed version, just append the auto querystring argument:

e.g. http://example.com/server-status?auto

Killing Stuck Processes

This script from Alain Kelder shows how you can identify and kill long-running processes without restarting Apache. I ran into this problem with a misbehaving Mantis plugin.

#/bin/bash

GetAllWorkers()
{
 AllWorkers=$(apache2ctl fullstatus | awk '/^Srv /,/^$/ {print}')
}

GetStuckWorkers()
{
 StuckWorkers=$(echo "$AllWorkers" | awk '$4 == "W" && $6 > 60 && $7 == 0 && $8 == "0.0" {print}')
 header=$(echo "$AllWorkers" | head -n 1)
}

GetStuckPIDs()
{
 StuckPIDs=$(echo "$AllWorkers" | awk '$4 == "W" && $6 > 60 && $7 == 0 && $8 == "0.0" {print$2}')
}

Show()
{
 echo "--------------------------------"
 echo " Stopped on $(date +%F\ %T)"
 echo "--------------------------------"
 echo "$header"
 echo "$StuckWorkers"
}

GetAllWorkers && GetStuckPIDs
if [ -n "$StuckPIDs" ]; then
  for PID in $StuckPIDs; do
    echo stopping $PID with SIGTERM
    kill $PID
  done
  GetStuckWorkers
  Show | mail -s "$(basename $0) executed on $(hostname -s)" root
  Show >> /path/to/ksaw.log
fi

Resources

  1. https://httpd.apache.org/docs/2.4/misc/perf-tuning.html
  2. https://www.linode.com/docs/websites/apache-tips-and-tricks/tuning-your-apache-server