Am 30. Mär, 2010 schwätzte Alex Dean so:
moin moin Alex,
what you wrote below is the best ganglia guide I've found. By far the best
I've found! Danke!
On Mar 29, 2010, at 9:42 PM, der.hans wrote:
moin moin,
I'm using ganglia for something. Someone else set it up, but I need to add
a bunch of metrics ( that will then be alerted via nagios ).
Just using gmetric as is given in multiple examples isn't working.
gmetric --name distribution_release --value $( lsb_release -d | sed -re
's/Description:[[:space:]]*//' ) --type 'string'
Running that via sudo also doesn't show up in the ganglia display.
Try tracing your metric from gmond to gmetad to the web. The path it takes
will vary depending on whether you use multicast or unicast, of course.
After you run the gmetric command, wait a few seconds and run 'telnet
localhost 8649'. gmond will give you an XML representation of all the
metrics it knows about. You should see your new metric there.
We're on different ports, but I'm working it out.
We have different ports for different clusters/groupings. Some boxen
appear to be in multiple groups.
On the node running gmetad, you can run 'telnet localhost 8651' to get data
for the entire cluster. Again, your metric should be there, assuming you've
waited long enough for gmetad to poll gmond for new data.
gmetad also provides an 'interactive' port, which by default is 8652. You
can send it a query string (which sorta looks like xpath, but isn't) and get
the values just for a single host (or a single metric on a single host).
This is a good path to ganglia/nagios integration.
$ telnet localhost 8652
Connected to localhost.
Escape character is '^]'.
/cluster_name/host_name/load_five/
... this will return just the load_five metric on host_name in the cluster
cluster_name.
If you find your metric in gmond, and in gmetad, then it sounds like you
might have a permissions problem with the rrd files. But I seem to recall
those kinds of problems *do* show up in /var/log/messages.
I'm certain we do have that problem.
Both give exit status of 0.
It's not showing up in /var/ganglia/rrds.
Who should own those rrds files? We have them owned by root, but gmond
runs as an unprivileged user?
They need to be writable by the user running gmetad (nobody?), and readable
by the Apache user.
Does ganglia automagically create the rrd files? User running gmetad needs
write perms for the rrd dir?
Thanks for the info!
ciao,
der.hans
--
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# Director of Engineering, FonWallet Transaction Solutions, Inc.
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