Hello. We have around 20 nodes of SLES 11 HAE servers running in 2 or 3 node clusters.
All of them are configured with local resources and ldirectord to load-balance to the local nodes with a highly available ldirectord resource being able to move on failover. I can give more info if required. -----Original Message----- From: lvs-users-boun...@linuxvirtualserver.org [mailto:lvs-users-boun...@linuxvirtualserver.org] On Behalf Of Mrvka Andreas Sent: 03 December 2010 10:43 To: 'lvs-users@linuxvirtualserver.org' Subject: Re: [lvs-users] is it possible to have ldirector and real cluster server on same physical machine? Hi, I've misstped the arp_announce entries. It should be 2 instead of 1. After a reboot it looks quite good having only one ldirector. I am satisfied at the moment. Novell HAE (High Availability Extension) shipps pacemaker. I will try to configure it managing ldirector service on both machines but only be explicitly active on one node. And in the backup-case pacemaker should switch. This sounds clear for me. But in fact, that the sysctl.cf file differs - how should this be updated? Thank you very much till now. Andrew -----Ursprüngliche Nachricht----- Von: Mrvka Andreas Gesendet: Freitag, 3. Dezember 2010 11:09 An: 'lvs-users@linuxvirtualserver.org' Betreff: AW: [lvs-users] is it possible to have ldirector and real cluster server on same physical machine? Hello Simon, thank you for your fast response! I am happy for every feedback. Actually I thought I can have more than one active ldirector (for failover and ldirector load balancing). Well, okay let's do ldirector with one node. I refer to your Ultramonkey Howto. ----- On my first node I run ldirector and cluster node --- eth0 is real IP and lo:0 is virtual IP. So I do have to arp_announce on lo:0 butnot arp_ignore. net.ipv4.conf.all.arp_announce = 1 # enable the feature net.ipv4.conf.lo.arp_anounce = 1 ----- On my second and n+1 node I run only cluster nodes --- eth0 is real IP and lo:0 is virtual IP. So I do have to arp_ignore on lo:0 but not arp_announce. net.ipv4.conf.all.arp_ignore = 1 # enable the feature net.ipv4.conf.lo.arp_ignore = 1 Is this correct? Thank for directing me into right direction. Andrew -----Ursprüngliche Nachricht----- Von: Simon Horman [mailto:ho...@verge.net.au] Gesendet: Freitag, 3. Dezember 2010 10:39 An: Mrvka Andreas Cc: 'lvs-users@linuxvirtualserver.org' Betreff: Re: [lvs-users] is it possible to have ldirector and real cluster server on same physical machine? On Fri, Dec 03, 2010 at 09:31:19AM +0100, Mrvka Andreas wrote: > Hello list, > > I hope you can help me. > I am using a simple 2 node cluster environment on SUSE Linux Enterprise > Server 11 SP1 HAE. > > I only use ldiretord/ipvs and an apache service on both machines. > My virtual IP address on interface lo:0 and real cluster IP on eth0. > > Regarding to the documentation of Novell it should be possible to have > ldirectord etc. on the same machines. > Do you agree? > > I ask because if I do a tcpdump I see lots of traffic from the client > browser to the server (http port) and the tcp session will never end. > ( client side has finished the transfer but on the server side tcpdump > runs and runs....) Hi Andreas, if you want a pair of machines and you want one of them to be the active linux director + a real server, and you want the other to be the backup-linux director + a real server then yes it is possible, but you need to take special care. 1. On the active linux director the VIP should be on lo and On the backup-linux director the VIP should be on ethX - That is, you need to move the VIP when a machine moves from being active to backup and vice versa. 2. The backup-linux director must not have LVS rules in place for the service being handled by the active linux director. - That is, you need to have ldirectord running on only the active linux director. Or in other words, you need to start it when a machine becomes active and stop it when it becomes a backup. 3. You have to make sure that arp_ignore and arp_announce are set correctly. Its a bit old, but I have some notes on this at http://www.ultramonkey.org/3/topologies/sl-ha-lb-eg.html (In relation to ARP you want the "Debian" notes unless you have a really ancient kernel.) _______________________________________________ Please read the documentation before posting - it's available at: http://www.linuxvirtualserver.org/ LinuxVirtualServer.org mailing list - lvs-users@LinuxVirtualServer.org Send requests to lvs-users-requ...@linuxvirtualserver.org or go to http://lists.graemef.net/mailman/listinfo/lvs-users _______________________________________________ Please read the documentation before posting - it's available at: http://www.linuxvirtualserver.org/ LinuxVirtualServer.org mailing list - lvs-users@LinuxVirtualServer.org Send requests to lvs-users-requ...@linuxvirtualserver.org or go to http://lists.graemef.net/mailman/listinfo/lvs-users
