Difference between revisions of "Apache/performance"

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=== Cli ===
 
=== Cli ===
 
<source lang='bash'>
 
<source lang='bash'>
# Using wget isn't advised because you'll get html output  
+
# Using wget isn't advised because you'll get html output.  However, if you simply append the ?auto querystring, you'll get machine readable output.
 
wget http://localhost/server-status -O -
 
wget http://localhost/server-status -O -
 +
curl localhost/server-status?auto
 
# Ubuntu
 
# Ubuntu
 
apache2ctl fullstatus
 
apache2ctl fullstatus
Line 13: Line 14:
 
Or you can edit <code>/mods.enabled/status</code> to get it from the browser. For a machine readable, condensed version, just append the '''auto''' querystring argument:
 
Or you can edit <code>/mods.enabled/status</code> 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
 
  e.g. http://example.com/server-status?auto
 +
 +
== Killing Stuck Processes ==
 +
[http://giantdorks.org/alain/script-to-individually-terminate-stuck-web-server-threads-without-restarting-apache/ 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.
 +
<source lang="bash">
 +
#/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
 +
</source>
  
 
== Resources ==
 
== Resources ==
 
# https://httpd.apache.org/docs/2.4/misc/perf-tuning.html
 
# https://httpd.apache.org/docs/2.4/misc/perf-tuning.html
 
# https://www.linode.com/docs/websites/apache-tips-and-tricks/tuning-your-apache-server
 
# https://www.linode.com/docs/websites/apache-tips-and-tricks/tuning-your-apache-server
 +
 +
[[Category:Apache]]
 +
[[Category:Webserver]]
 +
[[Category:Bash]]
 +
[[Category:System Administration]]

Revision as of 14:12, 20 October 2017

Get Stats[edit | edit source]

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[edit | edit source]

# Using wget isn't advised because you'll get html output.  However, if you simply append the ?auto querystring, you'll get machine readable output.
wget http://localhost/server-status -O -
curl localhost/server-status?auto
# 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[edit | edit source]

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[edit | edit source]

  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