Website:Monitoring services

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Load-balancing and automatic failover mechanisms are essential components of a high-availability system. Equally important is efficient detection of failing services and servers that may not fall under the auspices of the failover protocol. This may include monitoring the size of log files, the amount of disk space available, memory race conditions, and the availaibility of secondary services.

We use monit at WormBase to handle these tasks and more.

Installing monit

Monit is simple to install.

todd> cd ~/build
todd> tar xzf ../src/monit*.tar.gz
todd> cd monit*
todd> ./configure
todd> make
todd> sudo make install

Configuring monit

monit uses a fun free-text configuration file-format. Multiple instances of monit can be launched, each pointing to its own configuration file. By fun, I mean that it is much more fun that writing init scripts.

monit configuration files live at:


Test the monit configuration file

todd> monit -t -c /path/to/monitrc

Starting and stopping monit

Start monit by:

todd> monit -c /path/to/monitrc

Stop monit by:

todd> monit -c /path/to/monitrc quit

Configuring the system to run monit under init

We configure monit to run under init. To do this edit /etc/inittab with entries for each of the WormBase monitrc files:

 todd> sudo nano /etc/inittab
 // Add the following line as an example
mo:2345:respawn:/usr/local/bin/monit -Ic /home/todd/monitrc

Force init to re-read the configuration file by

todd> sudo /sbin/telinit q

What WormBase monitors


Nothing can bring down a server faster than logs that eat up all available disk space or that grow to behemoth proportions. This is particularly true of the sgifaceserver log serverlog.wrm, a file that grows so fast it makes my head spin. If this file hits 2GB in size, sgifaceserver will crash.



The Squid Cache on

The Cache Manager CGI

The Cache Manager CGI is only available from Note you must be "on localhost" in order to use this statistics viewer. You can access this CGI by tunneling port 81 traffic to and then accessing the following URL:

CacheHost   :
CachePort   : 80
Managername : [LSs canine]
Password    : [none required]

RRD Tool / real-time graphical analysis

You can also monitor squid performance in real-time graphically using RRDTools. Again, these tools are located behind the firewall on port

1 day statistics:
1 week statistics:


Select IP addresses can monitor httpd at:


I tend to disable this except when I am troubleshooting server load since it causes apache to unnecessarily keep track of lots of things.

Select IP addresses can also use my Apache::VMonitor script:

  -- IN PROGRESS - it currently only works on apache2 --