Ganglia
From Wikitech
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==merging RRDs== | ==merging RRDs== | ||
It is possible, in principle, to merge RRDs using a perl script which can be found on the net somewhere. Looks like a royal pain though. | It is possible, in principle, to merge RRDs using a perl script which can be found on the net somewhere. Looks like a royal pain though. | ||
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| + | The script location is available through [http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/rrdworld/index.en.htmlRRDWorld on RRDTool official website]. You might want to look at [http://www.pintori.it:8080/rrd-merger/README the README file]. | ||
{{PD}} | {{PD}} | ||
[[Category:Bot and monitoring]] | [[Category:Bot and monitoring]] | ||
Revision as of 22:16, 8 November 2005
Contents |
unicast vs multicast
- As of version 3.0.0, released 2005-02-07, status messages can be sent over unicast.
components
- gmetad
- This daemon collect data from the other hosts and write them to RRD databases.
- It is installed on zwinger using ganglia-monitor-core-gmetad-2.5.6-1.i386.rpm
- gmond
- It is a daemon installed on each machine that locally collect usefull informations. It is queried from time to time by the gmetad hosts.
- gmond is nstalled on each machine using ganglia-monitor-core-gmond-2.5.6-1.i386.rpm
-
/etc/gmond.conf on each machine MUST be a symlink to /home/wikipedia/gmond.conf. If the default gmond.conf is used, ganglia stats for the entire cluster will not be recorded in the right place and will be effectively lost. (But see merging RRDs below.)
version mismatches
- things go wrong when gmond and gmetad have different versions. or is it when peer gmonds have different versions? something like that anyway
zwinger
RRDs (ganglia statistics, in this case) are in /home/wikipedia/rrds there is some old data in the default location, /var/lib/ganglia/rrds
cluster-wide ganglia restart
If something is amiss with the state of ganglia, and reconfiguring and restarting gmetad isn't enough, do this on zwinger as root:
#!/bin/bash /etc/init.d/gmetad stop dsh -f -a /etc/init.d/gmond stop sleep 5 dsh -f -a /etc/init.d/gmond start /etc/init.d/gmetad start
or you can just run /home/wikipedia/bin/ganglia-restart-all.
merging RRDs
It is possible, in principle, to merge RRDs using a perl script which can be found on the net somewhere. Looks like a royal pain though.
The script location is available through on RRDTool official website. You might want to look at the README file.
