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Full Discussion: Check load and action
Top Forums Shell Programming and Scripting Check load and action Post 302923806 by MadeInGermany on Tuesday 4th of November 2014 02:00:36 PM
Old 11-04-2014
Quote:
Originally Posted by Aia
Some comment:
I would stay away from that SIGNAL -9, at least I would find out what could be the side-effects of it.

If httpd is not running because you kill it, service httpd start should be the more appropriated command. Speaking of appropriated, service httpd stop would be a better choice than pkill -9 httpd

It is best to use absolute paths in a cronjob. e.g. /sbin/service httpd start

Interesting you are using a variable named loadavg. The Linux kernel keeps a realtime record of that average load in /proc/loadavg. Reading from that would be cleaner that using uptime.

Let's use awk to handle the floating point as well.
Code:
awk '{print ($1>10? 1 : 0)}' /proc/loadavg

The return of awk can be use to follow with a flow control branch
Or set an exit code in awk that can be directly used in the shell's if clause:
Code:
if awk '{exit ($2>10? 1 : 0)}' /proc/loadavg
then
  : echo okay
else
  service httpd stop
  sleep 1
  kill -9 -x httpd # hard-kill remaining httpd's
  service httpd start
  sleep 5
  service varnish restart
fi

I use the 5 minutes average ($2=2nd value), and this should be run every 5..10 minutes.

Last edited by MadeInGermany; 11-04-2014 at 03:07 PM..
 

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APACHECTL(8)							     apachectl							      APACHECTL(8)

NAME
apachectl - Apache HTTP Server Control Interface SYNOPSIS
When acting in pass-through mode, apachectl can take all the arguments available for the httpd binary. apachectl [ httpd-argument ] When acting in SysV init mode, apachectl takes simple, one-word commands, defined below. apachectl command SUMMARY
apachectl is a front end to the Apache HyperText Transfer Protocol (HTTP) server. It is designed to help the administrator control the functioning of the Apache httpd daemon. The apachectl script can operate in two modes. First, it can act as a simple front-end to the httpd command that simply sets any necessary environment variables and then invokes httpd, passing through any command line arguments. Second, apachectl can act as a SysV init script, taking simple one-word arguments like start, restart, and stop, and translating them into appropriate signals to httpd. If your Apache installation uses non-standard paths, you will need to edit the apachectl script to set the appropriate paths to the httpd binary. You can also specify any necessary httpd command line arguments. See the comments in the script for details. The apachectl script returns a 0 exit value on success, and >0 if an error occurs. For more details, view the comments in the script. OPTIONS
Only the SysV init-style options are defined here. Other arguments are defined on the httpd manual page. start Start the Apache httpd daemon. Gives an error if it is already running. This is equivalent to apachectl -k start. stop Stops the Apache httpd daemon. This is equivalent to apachectl -k stop. restart Restarts the Apache httpd daemon. If the daemon is not running, it is started. This command automatically checks the configuration files as in configtest before initiating the restart to make sure the daemon doesn't die. This is equivalent to apachectl -k restart. fullstatus Displays a full status report from mod_status. For this to work, you need to have mod_status enabled on your server and a text-based browser such as lynx available on your system. The URL used to access the status report can be set by editing the STATUSURL variable in the script. status Displays a brief status report. Similar to the fullstatus option, except that the list of requests currently being served is omit- ted. graceful Gracefully restarts the Apache httpd daemon. If the daemon is not running, it is started. This differs from a normal restart in that currently open connections are not aborted. A side effect is that old log files will not be closed immediately. This means that if used in a log rotation script, a substantial delay may be necessary to ensure that the old log files are closed before processing them. This command automatically checks the configuration files as in configtest before initiating the restart to make sure Apache doesn't die. This is equivalent to apachectl -k graceful. graceful-stop Gracefully stops the Apache httpd daemon. This differs from a normal stop in that currently open connections are not aborted. A side effect is that old log files will not be closed immediately. This is equivalent to apachectl -k graceful-stop. configtest Run a configuration file syntax test. It parses the configuration files and either reports Syntax Ok or detailed information about the particular syntax error. This is equivalent to apachectl -t. The following option was available in earlier versions but has been removed. startssl To start httpd with SSL support, you should edit your configuration file to include the relevant directives and then use the normal apachectl start. Apache HTTP Server 2005-09-20 APACHECTL(8)
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