I have observed this condition on a number of occasions. It seems it gets triggered if the client can't contact the destination gmond. For example I occasionally see random cron e-mail about this issue when a gmetric using cron job would fail. Also I have seen it more regularly when I switched gmond aggregator and all the hosts that were pointing to now nonexistant gmond would be e-mailing me about can't create send_channel.
I don't know if that sheds any light. Vladimir On Wed, 9 Mar 2011, Rick Cobb wrote: > The message is generated when gmetric is trying to open UDP sockets to > send to your gmond server on. Perhaps the user you're doing this isn't > permitted to do so, by firewall policy or something along those lines. > You might get better diagnostics by turning on debugging using the > debug flag in the gmond.conf. > > OTOH, I took a quick look at the 3.1.1 version of the source for the > routine that's failing you. > (http://ganglia.sourcearchive.com/documentation/3.1.1/libgmond_8c-source.html > , the routine is Ganglia_udp_send_channels_create.) The only way it > can return no sockets _and_ not generate another error message besides > the one you see is if it can't find any udp_send_channel > configurations in the configuration file. You might want to try > posting your config file so we can look at it for more diagnosis. > > Hope this helps -- > -- ReC > > On Wed, Mar 9, 2011 at 9:26 PM, Indranil Chakravorty > <[email protected]> wrote: >> Hi, >> I have a ganglia server running multiple gmond with one conf file for each >> cluster. I want to run gmetric such that it spoofs as coming from a specific >> machine. I want the rrd file to be generated under one of the many clusters >> I have. I run gmetad with -c option to specify the conf file corresponding >> to the cluster. I am getting error. Could anyone help? Thanks. >> # gmetric -d 50 -t float -n "varnish_lat" -u "milli seconds" -v 5 -S >> "10.50.35.10:monitorcdn" -c "/etc/ganglia/cdn_gmond.conf" >> Unable to create ganglia send channels. Exiting. >> >> Thanks, >> Neel >> ------------------------------------------------------------------------------ >> Colocation vs. Managed Hosting >> A question and answer guide to determining the best fit >> for your organization - today and in the future. >> http://p.sf.net/sfu/internap-sfd2d >> _______________________________________________ >> Ganglia-general mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/ganglia-general >> >> > > ------------------------------------------------------------------------------ > Colocation vs. Managed Hosting > A question and answer guide to determining the best fit > for your organization - today and in the future. > http://p.sf.net/sfu/internap-sfd2d > _______________________________________________ > Ganglia-general mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/ganglia-general > ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Ganglia-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ganglia-general
