Mailing List Archive: [lvs-users] Reg. LVS DR with VIP

[lvs-users] Reg. LVS DR with VIP

Dec 5, 2013, 12:45 AM

Post #1 of 3 (877 views)

Hi all,

I have a machine where the LVS runs with a VIP on eth0 and the 2 real
backend servers have the same VIP in lo:0 interface. I have added
arp_announce and arp_ignore in /proc/sys/net/ipv4/conf/*

In the 3 node setup, whenever the LVS node fails , the LVS migrates to any
one of the real nodes. But the VIP is also configured on the lo:0 interface.

Does it pose any problem to have same VIP on both eth0:0 and lo:0
interfaces???

Thanks
Eswar
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Re: [lvs-users] Reg. LVS DR with VIP [ In reply to ]

darren.mansell at gmail

Dec 5, 2013, 1:04 AM

Post #2 of 3 (858 views)

Permalink

It shouldn't do but I had some weird issues communicating between real
servers when this happened so I had to modify the IPAddr2 script to remove
the IP as there seems to be a bit of a regression with lvs_support=true
where it has to match the full IP and subnet to remove, but you need to
have the VIP as /32 on loopback and /24 on eth0
On 5 Dec 2013 08:52, "ESWAR RAO" <eswar7028@gmail.com> wrote:

> Hi all,
>
>
> I have a machine where the LVS runs with a VIP on eth0 and the 2 real
> backend servers have the same VIP in lo:0 interface. I have added
> arp_announce and arp_ignore in /proc/sys/net/ipv4/conf/*
>
> In the 3 node setup, whenever the LVS node fails , the LVS migrates to any
> one of the real nodes. But the VIP is also configured on the lo:0
> interface.
>
> Does it pose any problem to have same VIP on both eth0:0 and lo:0
> interfaces???
>
> Thanks
> Eswar
> _______________________________________________
> 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-request@LinuxVirtualServer.org
> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
>
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Re: [lvs-users] Reg. LVS DR with VIP [ In reply to ]

ja at ssi

Dec 5, 2013, 1:25 AM

Post #3 of 3 (852 views)

Permalink

Hello,

On Thu, 5 Dec 2013, ESWAR RAO wrote:

> Hi all,
>
>
> I have a machine where the LVS runs with a VIP on eth0 and the 2 real
> backend servers have the same VIP in lo:0 interface. I have added
> arp_announce and arp_ignore in /proc/sys/net/ipv4/conf/*
>
> In the 3 node setup, whenever the LVS node fails , the LVS migrates to any
> one of the real nodes. But the VIP is also configured on the lo:0 interface.
>
> Does it pose any problem to have same VIP on both eth0:0 and lo:0
> interfaces???

IMHO, it should work, as long as 'arping VIP'
from another box shows MAC(s) only from current director.
I don't remember for a problem when same IP is added
multiple times.

Regards

--
Julian Anastasov <ja@ssi.bg>

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