[Pacemaker] Understanding virtual IP migration

[Arjun Pandey]

Apologies for the delayed response. Well i am using IPAddr2 resource.
I don't configure the addresses statically. It gets configured when
pacemaker starts this resource.Failure handling of this link(when i
manually bring the link down ) also works. It's just that even though
the IP has moved.
If you bring the failed link back again it still has that IP address.I
have a 2 node(Active-Standby) cluster with 2 virtual IP's
configured.Hence stonith is also disabled.


On Thu, Jul 24, 2014 at 12:00 AM, Ken Gaillot <kjgaillo at gleim.com> wrote:
> On 07/23/2014 12:15 AM, Arjun Pandey wrote:
>>
>> I am using virtual IP resource on  a 2 node (Active-Passive) cluster.
>> I was testing the migration of IP address. Moving the link down moves
>> the IP over to the other node. However if i bring interface up on the
>> node the VIP is still associated with this interface. Shouldn't we
>> have removed this when we decided to migrate the IP in the first place
>> ?
>>
>> Also on a related note plugging out the cable, doesn't lead to IP
>> migration. I checked the IPAddr monitor logic which simply checks if
>> the address is still associated with the interface. However shouldn't
>> we be checking link state as well using ethtool.
>
>
> Hello Arjun,
>
> Pacemaker can certainly do what you want, but the configuration has to be
> exactly right. Can you post what configuration you're using?
>
> Based on the information provided, one guess is that you might have the IP
> statically configured on the interface (outside pacemaker), so that when you
> bring the interface up, the static configuration is taking effect. When a
> resource is managed by pacemaker, it should not be configured to start or
> stop by any other means.
>
> Regarding the pull-the-cable test, what is your networking setup? Does each
> cluster node have a single network connection, or do you have a dedicated
> link for clustering traffic? Do you have any sort of STONITH configured?
>
> -- Ken Gaillot <kjgaillo at gleim.com>
> Network Operations Center, Gleim Publications
>
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