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Thanks Micheal.
I am thinking of implementing one more heartbeat, 3 heartbeat can decide
better right ?
It is a good idea to use stonith or not ?
I did not understand what you mean by using pingd... Can you explain it
better ?
[]'sf.rique
On Thu, Sep 16, 2010 at 1:53 AM, Michael Schhwartzkopff <
misch@xxxxxxxxxxxxxx> wrote:
> 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:
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>
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_______________________________________________
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LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
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