Mythic Beasts

Server graphs

Our server graphs record lots of performance data from your server, which is then compactly presented in graph format. We have integrated the popular Open Source munin system with our own Mythic Beasts control panel to present attractive graphs tailored to your servers.

Technical details

On your server, you need to run the lightweight munin-node framework, which is already integrated with all the popular Linux distributions. The framework comes with a large number of plugins which make the actual measurements. Standard plugins include CPU usage, disk use, system load, memory use, database queries, disk activity, apache throughput, S.M.A.R.T. statistics, email queue... the sort of metrics that system administrators look at all the time, except that munin really does look at them all the time.

More plugins can be downloaded, and custom plugins can easily be written. For example, one Mythic Beasts customer had an issue with a process that was apparently leaking file descriptors. We coded up a new plugin that measured just that. After gathering data for a few days, it became very clear that the process wasn't actually leaking descriptors, but sometimes under heavy load would open up to 700 files at a time. We adjusted the process limits accordingly, and the case was closed. (But munin continues to quietly monitor the process...)

Every 5 minutes, our munin master connects to your server and collects current values for all configured variables. There are various options (all with sensible defaults) for which data are collected together, and how they are plotted. The end result is a dozen or so graphs for each server, each available for the last day, week, month, and year.

Sample graphs

These are genuine munin graphs for a busy database server, homing in on just the MySQL statistics. The increase in traffic each weekday during office hours is obvious, and you can see that some improvements were made to the codebase in March that reduced the number of database inserts. Otherwise there appears to be a slight trend towards increased traffic, but nothing to worry about yet.

daily graph weekly graph
monthly graph yearly graph

Pricing

The server graphs service costs 5 + VAT per month, or 50 + VAT per year. Please get in touch if you are interested.

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