Questions[ganglia](server)

I use ganglia to monitor my computer cluster:

(source of the image)

When I restart the Ganglia server, the gmond daemon on the other servers in the cluster stop sending information to the Ganglia server. I have to run

sudo /etc/init.d/ganglia-monitor restart

on each server.

Can Ganglia's gmond be configured so that it doesn't need to be restarted if the Ganglia server is restarted?

I use:

• Ganglia Web Frontend version 3.6.1
• Ganglia Web Backend (gmetad) version 3.6.0
• RRDtool version 1.4.7.
• Ubuntu 14.04.3 LTS x64 server

How can I create custom graphs in ganglia. I have couple of scripts written, which can return the data in intergers, I want to graph them in ganglia. I can get the output from my scripts every minute.

I've got a nagios server setup for monitoring ~ 30 Windows servers. I want to add some trending charts. I've read that nagios graphing plugins are simple and many people use seperate, standalone charting/trending tools.

What are the restrictions of the nagios graphing plugins vs standalone products like ganglia/munin/cacti?

I'm interested in specific features and advantages that standalone packages offer and nagios graphing plugins don't.

In Amazon EC2 I have a setup of proxies and 1 monitor (MON). I've installed gmond in the proxies and gmetad in MON. My data source for gmetad.conf in MON look like this:

data_source "proxies"  proxy1:8654 proxy2:8654 proxy3:8654

In the proxies's gmond.conf I have:

tcp_accept_channel {
  port = 8654
}

Everything is working fine, when I telnet from MON to the proxies I get the XML with the right data. The problem is that the web frontend only shows one source from cluster "proxies", indeed it shows the first source I put on the list, in this case proxy1. If I change the order:

data_source "proxies"  proxy2:8654 proxy3:8654 proxy1:8654

It only shows data from proxy2.

I've installed other monitoring systems in Ganglia using TCP or UDP, even through ssh tunnels but is the first time I see this behaviour. I'm not using multicast because (as far as I know) Amazon doesn't support on their network. Why is Ganglia-Web only showing one data source?

I'm running Ganglia 3.1.2 on a network where there is no multicast (nor can I turn it on). Does anyone have an elegant solution for getting ganglia to work correctly? I found this:

http://code.google.com/p/ganglia-multicast-hack/

but it does not scale very well.

Right now, I have separate data_source lines for each host on my network in my gmetad.conf file, but that too does not scale well, and I can't get accurate summary statistics, because it keeps overwriting the rrds (although the host statistics work just fine).

Any pointers would be greatly appreciated (or confirmation that I have found the best solution already).

Thanks!