November 2012
Beginner to intermediate
254 pages
7h 25m
English
book
Monitoring with Ganglia
by Alex Dean, Robert Alexander, Dave Josephsen, Vladimir Vuksan, Bernard Li, Brad Nicholes, Jeff Buchbinder, Frederiko Costa, Matt Massie, Peter Phaal, Daniel Pocock
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Chapter 6. Troubleshooting Ganglia
Overview
Sooner or later, you may encounter a problem with the Ganglia infrastructure. Because it is a distributed architecture, it is not always obvious which component is at fault. Sometimes, the fault may be completely outside the scope of the Ganglia system, such as a DNS issue, a faulty network card, or even a poorly configured web browser that results in a user mistakenly asserting that the Ganglia reports are broken.
This chapter aims to provide a systematic way of categorizing the faults, investigating them, identifying which component is responsible, rectifying the issue, and, if necessary, communicating details of the issue to the Ganglia community for discussion on the mailing list or registration in the bug database.
Known Bugs and Other Limitations
There are a number of known bugs and other limitations in the Ganglia system. For example, Ganglia is dependent on the system clock, and meaningful data will not be collected and reported if the cluster machines, data collectors, and web server machines do not have clock synchronization. This is a limitation of the Ganglia design, but it is not considered a bug.
Another known issue, fixed only just before the publication of this book (in Ganglia 3.3.7 and beyond), is that Ganglia was not working on a Solaris zone or container environment (this issue can also be worked around by disabling the network module).
To save time troubleshooting, you may wish to peruse the list of ...
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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.