On Wednesday 15 September 2010 22:47:08 Henrique Fernandes wrote: > I am having problens configuring this kind of setup. Heartbeat works fine, > but i guess i am getting wrong in the logic. > > What i want! > > > 2 load-balancer with HB and ldiretord > 2 Postfix. > > Think about this. > > have 2 shared ips for the load-balancer. > one external and one internal. > > will call lb1 and lb2 for load-balancers and pf1 pf2 for postfix > > ips are just illustratives > > lb1: > shared external ip 222.222.222.222 in eth0 > shared internal ip 192.168.0.1 in eth2 ( this will be the gateway for > pf1 e pf2 ) > internal ip 192.168.0.3 > > lb2: > > shared external ip 222.222.222.222 in eth0 > shared internal ip 192.168.0.1 in eth2 ( this will be the gateway for > pf1 e pf2 ) > internal ip 192.168.0.2 > > pf1: > internal ip 192.168.0.11 > gateway 192.168.0.1 > > pf2: > internal ip 192.168.0.12 > gateway 192.168.0.1 > > Ldirectord checks the pf and etc. This step works fine. > > Now the problem is the heartbeat. > > I am doing ucast. over interface eth2 in both but look the problem. > > The heartbeat is checking ok if the lb1 shutdowns. > > But problens begins when: > > lb1 loses eth0, heartbeat simple does nothing. > lb1 loses eth2, heartbeat in lb2 think lb1 had going down, and takeover, > but now we have conflict ips. > > How to solve this ? > > Now researching more, i find out that heartbeat can do check in 2 > interfaces. But problem still hapens, just will be harder to happen. > > I guess if i introduce more one node, it may do the tricky. Cause now we > have 3 nodes, and they can never have a tie. and becamo with same ip. But > this new heartbeat will only have heartbet without ldiretord. > > I am current not using stonith, should i use ? > If anyone have any tips please i would be glad to hear them!! > > Thanks!
Hi, what you describe is the typical split brain szenario. Using two heartbeat connections dramatically reduces the probability of a split brain. Introduction of STONITH reduces the impact of a split brain -> No double IP in your net. With three nodes you could also use the quorum technique. You also could use the pingd resource to run the ldirectord resource on a node with full network connectivity. Greetings, -- Dr. Michael Schwartzkopff Guardinistr. 63 81375 München Tel: (0163) 172 50 98 _______________________________________________ Please read the documentation before posting - it's available at: http://www.linuxvirtualserver.org/ LinuxVirtualServer.org mailing list - [email protected] Send requests to [email protected] or go to http://lists.graemef.net/mailman/listinfo/lvs-users
