Re: [Ganglia-general] multicast not working
Hi Khrist, well that makes sense indeed. All my VM's are running in a private cloud infrastructure so I have no control over their network characteristics. But still, for instance, in gmetad I am gathering the data from node1, and node1's IP is in the same subnet as node2: - node1 IP= x.x.x.169 - node2 IP= x.x.x.96 but in Ganglia frontend, I only get information from node1!! Nevertheless, do I have to do any extra configuration to put multicast working? Because I did nothing in the gmonds. I just installed ganglia and ganglia-gmond and I left gmond.conf as default. Is this correct? Cumprimentos / Best regards, Cristóvão José Domingues Cordeiro From: Khrist Hansen [khrist.han...@gmail.com] Sent: 20 March 2014 23:07 To: Cristovao Jose Domingues Cordeiro; ganglia-general@lists.sourceforge.net Subject: RE: [Ganglia-general] multicast not working I had the same problem due to multicast packets not being routed between subnets. Are your nodes on different subnets/VLANs? There are some tools out there that will test multicast connectivity across subnets. All that comes to mind for the moment is mping on AIX, but I know there are more for the various OS platforms. I had to use unicast in the end, but I am still working on my network engineering team to enable multicast routing between subnets. Hope that helps, Khrist Hansen From: Cristovao Jose Domingues Cordeiro [mailto:cristovao.corde...@cern.ch] Sent: Thursday, March 20, 2014 10:42 AM To: ganglia-general@lists.sourceforge.net Subject: [Ganglia-general] multicast not working Hi, I'm trying to set the simplest of clusters with mcast. Basically I have one gmetad.conf where I just did: data_source unspecified node1 then, I have in one cloud, node1, node2, node3, node4 and node5. All of these have default gmond installations with no changes in gmond.conf. The problem is that in my frontend, I only get node1 and not the others. Weren't they supposed to talk with each others and have all the metrics about each others? Thanks Cumprimentos / Best regards, Cristóvão José Domingues Cordeiro -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech___ Ganglia-general mailing list Ganglia-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-general
Re: [Ganglia-general] multicast not working
Yes, that is correct insofar as I know. Even though your nodes are on the same subnet, your private clouds network config may still be preventing multicast in some way. Assuming your OS is some flavor of Linux, I would try one of the freely available tools to test multicast routing between node1 and your other nodes. A quick google search led me to these tools: * mz * ssmping * iperf http://serverfault.com/questions/211482/tools-to-test-multicast-routing From: Cristovao Jose Domingues Cordeiro [mailto:cristovao.corde...@cern.ch] Sent: Friday, March 21, 2014 4:23 AM To: Khrist Hansen; ganglia-general@lists.sourceforge.net Subject: RE: [Ganglia-general] multicast not working Hi Khrist, well that makes sense indeed. All my VM's are running in a private cloud infrastructure so I have no control over their network characteristics. But still, for instance, in gmetad I am gathering the data from node1, and node1's IP is in the same subnet as node2: - node1 IP= x.x.x.169 - node2 IP= x.x.x.96 but in Ganglia frontend, I only get information from node1!! Nevertheless, do I have to do any extra configuration to put multicast working? Because I did nothing in the gmonds. I just installed ganglia and ganglia-gmond and I left gmond.conf as default. Is this correct? Cumprimentos / Best regards, Cristóvão José Domingues Cordeiro _ From: Khrist Hansen [khrist.han...@gmail.com] Sent: 20 March 2014 23:07 To: Cristovao Jose Domingues Cordeiro; ganglia-general@lists.sourceforge.net Subject: RE: [Ganglia-general] multicast not working I had the same problem due to multicast packets not being routed between subnets. Are your nodes on different subnets/VLANs? There are some tools out there that will test multicast connectivity across subnets. All that comes to mind for the moment is mping on AIX, but I know there are more for the various OS platforms. I had to use unicast in the end, but I am still working on my network engineering team to enable multicast routing between subnets. Hope that helps, Khrist Hansen From: Cristovao Jose Domingues Cordeiro [mailto:cristovao.corde...@cern.ch] Sent: Thursday, March 20, 2014 10:42 AM To: ganglia-general@lists.sourceforge.net Subject: [Ganglia-general] multicast not working Hi, I'm trying to set the simplest of clusters with mcast. Basically I have one gmetad.conf where I just did: data_source unspecified node1 then, I have in one cloud, node1, node2, node3, node4 and node5. All of these have default gmond installations with no changes in gmond.conf. The problem is that in my frontend, I only get node1 and not the others. Weren't they supposed to talk with each others and have all the metrics about each others? Thanks Cumprimentos / Best regards, Cristóvão José Domingues Cordeiro -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech___ Ganglia-general mailing list Ganglia-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-general
[Ganglia-general] multicast not working
Hi, I'm trying to set the simplest of clusters with mcast. Basically I have one gmetad.conf where I just did: data_source unspecified node1 then, I have in one cloud, node1, node2, node3, node4 and node5. All of these have default gmond installations with no changes in gmond.conf. The problem is that in my frontend, I only get node1 and not the others. Weren't they supposed to talk with each others and have all the metrics about each others? Thanks Cumprimentos / Best regards, Cristóvão José Domingues Cordeiro -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech___ Ganglia-general mailing list Ganglia-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-general
Re: [Ganglia-general] multicast not working
I had the same problem due to multicast packets not being routed between subnets. Are your nodes on different subnets/VLANs? There are some tools out there that will test multicast connectivity across subnets. All that comes to mind for the moment is mping on AIX, but I know there are more for the various OS platforms. I had to use unicast in the end, but I am still working on my network engineering team to enable multicast routing between subnets. Hope that helps, Khrist Hansen From: Cristovao Jose Domingues Cordeiro [mailto:cristovao.corde...@cern.ch] Sent: Thursday, March 20, 2014 10:42 AM To: ganglia-general@lists.sourceforge.net Subject: [Ganglia-general] multicast not working Hi, I'm trying to set the simplest of clusters with mcast. Basically I have one gmetad.conf where I just did: data_source unspecified node1 then, I have in one cloud, node1, node2, node3, node4 and node5. All of these have default gmond installations with no changes in gmond.conf. The problem is that in my frontend, I only get node1 and not the others. Weren't they supposed to talk with each others and have all the metrics about each others? Thanks Cumprimentos / Best regards, Cristóvão José Domingues Cordeiro -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech___ Ganglia-general mailing list Ganglia-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-general
