January 2017
Beginner
66 pages
1h 14m
English
Content preview from Monitoring Taxonomy
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Chapter 9. traditional.free_open.processors.network
The traditional open source, network-centric data processors precursor their data-centric cousins. Because SNMP was so widely adopted by network hardware vendors, metrics collection was an obvious and effective way to understand them.
Cacti: Bringing Joy to NetOps Since 1996
Cacti is one of the first metrics-centric monolithic monitoring tools. It’s a centralized poller built within a PHP app with old-school, static, web-form-based configuration. Cacti has always been a bit inflexible and unwieldy for systems administrators, but its first-class support for SNMP and RRDTool continues to make it extremely popular with the network-operations crowd to this day.
Push, Pull, Both, or Neither?
Cacti is a centralized poller. It polls via Cron using an included PHP script.
Measurement Resolution
Being a Cron-based poller, Cacti is capable only of intervals greater than a minute. The default polling interval is five minutes.
Data Storage
Cacti uses a MySQL database to house meta-data and RRDTool to store metrics.
Analysis Capabilities
Cacti’s UI is based on RRDTool Graphs. It doesn’t make the mistake of making you dig to find graphs, and the UI is comparatively useful (versus systems like Xymon or MRTG), but it suffers from the normal litany of RRDTool problems, including required preconfiguration, no means of ad hoc adjusting axis, no ad hoc data transformation support, and no easy means of plotting multiple signals on the same ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.