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I'm new to Linux and I setup Ubuntu 12.04 on Digital Ocean.

I installed Monit and got it to monitor MySQL successfully with email alert.

I want to monitor Apache2 as well but cannot find any httpd.pid file needed to put in monitrc file.

I can start Apache2 with: /etc/init.d/apache2 start

I can stop Apache2 with: /etc/init.d/apache2 stop

I can restart Spache2 with: /etc/init.d/apache2 restart

What other way is there to monitor Apache2 in Monit without a httpd.pid file?

Giacomo1968
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Bergen
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4 Answers4

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If you look in the init script it uses the value of $APACHE_PID_FILE which it reads from the file defined as $APACHE_ENVVARS which I think defaults to /etc/apache2/envvars

PIDFILE=$(. $APACHE_ENVVARS && echo $APACHE_PID_FILE)

In the envvars file PIDFILE is defined as

APACHE_PID_FILE=/var/run/apache2$SUFFIX.pid

Unless you are running multiple instances of apache2 $SUFFIX will likely be "" so the value of $APACHE_PID_FILE will be 

/var/run/apache2.pid

but you should be able to run

echo $(. /etc/apache2/envvars && echo $APACHE_PID_FILE)

and get what your system thinks the value is.

user9517
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  • I found: /var/run/apache2.pid – Bergen Jul 09 '13 at 20:27
  • @Bergen: there you go then - problem solved - ✔ – user9517 Jul 09 '13 at 20:28
  • In monitrc file i put: #apache2 check process apache2 with pidfile /var/run/apache2.pid group apache start program = "/etc/init.d/apache2 start" stop program = "/etc/init.d/apache2 stop" if failed host 127.0.0.1 port 80 protocol http then restart if 5 restarts within 5 cycles then timeout – Bergen Jul 09 '13 at 20:28
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On Centos, there is a good chance that you use "service" utility to manage deamons. Services are configured in directory: /etc/init.d/

In file /etc/init.d/httpd, you will find the pid file location. I see something like pidfile=${PIDFILE-/var/run/httpd/${prog}.pid}

So, it turns out that my pidfile is located at /var/run/httpd/httpd.pid

Mayank Jaiswal
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Two things I would try:

  1. See if you can configure Apache to write out a PID file. Ref: http://httpd.apache.org/docs/2.2/mod/mpm_common.html#pidfile
  2. Modify apache2 start/stop script to create a PID file during the start/stop using the pgrep command. Ref: http://mmonit.com/wiki/Monit/ConfigurationExamples
martian111
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if you install Apache 2.4 or through chef cookbook(https://github.com/sous-chefs/apache2) then the location would be /var/run/apache2/apache2.pid

Raushan
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