I usually use "gmetric" and a separate script for this work, but we're a
Ganglia-3.0 (pre-plugin-module) shop; I don't know how you'd handle it in the
gmond "module" world - perhaps by forking a separate process that ran your jps
in a sleep loop (as the appropriate user) and piped that into your module. Of
course, 3.1 does have gmetric, so you could solve it the old-fashioned way.
-- ReC
On 3/16/09 3:16 PM, "Chuck Clark" <[email protected]> wrote:
How have others handled collecting metrics which must be gathered as a user
different than the user which gmond runs under?
Background/Example of my situation:
In Java 1.6 two new experimental utilities were added: jps and jstat. The
former is essentially the Unix ps command for java processes. The latter
interrogates a JVM and reports on statistics like heap size and utilization.
(Specific details:
http://java.sun.com/javase/6/docs/technotes/tools/index.html#monitor)
I've written a python module for Ganglia to find my JVM using jps and then get
metrics using jstat so it would look something similar to:
[u...@server1 bin]$ jps -lv
19911 sun.tools.jps.Jps -Dapplication.home=/opt/SDK/jdk -Xms8m
3897 com.sun.enterprise.server.PELaunch
[u...@server1 bin]$ jstat -gc 3897
S0C S1C S0U S1U EC EU OC OU PC PU
YGC YGCT FGC FGCT GCT
3264.0 3264.0 0.0 1058.9 26240.0 23502.1 736168.0 226873.6 179112.0
107394.5 3485 118.810 130 22.759 141.569
I have a pretty vanilla Ganglia install setup like many of the tutorials Google
returns which means gmond is running as user=nobody as specified in the globals
section of gmond.conf. The problem with jps and jstat is they must run as the
same user as when the JVM was started (in my instance let's say this is a user
named app). I could set user=app in my gmond.conf and everything should work.
But I like having my ganglia processes running as a different user just from an
organization perspective. Also, I expect in the near future I to be monitoring
something else on this server running as a different user.
Has anyone else encountered a similar scenario and how have you gotten around
this?
TIA,
chuck
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