Over the years I’ve had to write plenty of Hobbit / Xymon scripts to monitor various different things within my employers systems. Since most all of our applications are custom there are not always built in tests that will work for us. For example, we use Xen for our development virtual machines and being able to track what was going on with those virtual machines is important and being able to identify a VM within Xymon at a moments glance is important to us, so we created a test that does just that. We have created in house scripts for MySQL Status, MySQL Running Queries, our in house distributed services, Lighttpd (as discussed earlier on this blog), Apache, Memcached, etc. This doesnt include the hundreds of different snmp tests we’ve added to Devmon for monitoring our network equiptment.
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My employer starting using lighttpd on one layer of our architecture about a year or so ago, until now that layer has kind of been a black box to the majority of the technical staff due to not having mod_status enabled. In preparation for it being turned on (I requested it be so after using it on my own servers), I have created a Xymon Monitor (formally know as Hobbit) script which hits the /server-status page on the localhost and reports that data back to Xymon. The data it reports includes requests per second and “amount increase since last script run” for the “Total KBytes” and “Total Accesses” numbers. I also created a graph for the requests per seconds stat.
The Graph definition is as follows:
[lighttpd]
TITLE lighttpd Requests/Second
YAXIS # reqs/sec
DEF:RPS=lighttpd.rrd:reqpersec:AVERAGE
LINE2:RPS#0000CC:reqs/sec
COMMENT:
GPRINT:RPS:LAST:Requests per Second : %5.1lf (cur)
GPRINT:RPS:MAX: : %5.1lf (max)
GPRINT:RPS:MIN: : %5.1lf (min)
GPRINT:RPS:AVERAGE: : %5.1lf (avg)
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