[ClusterLabs] Can Pacemaker monitor geographical separated servers

[Andrei Borzenkov]

On Tue, Aug 9, 2016 at 9:40 PM, bhargav M.P <mpbhargav at gmail.com> wrote:
> Hi All,
> I have deployment where we have two Linux servers that are geographically
> separated and they are across different subnets . I want the server to work
> in  Active/Standby mode . I would like to use pacemaker-corsync for
> performing switch over when active fails.

While it is technically possible, such configurations are usually
implemented using loosely coupled local clusters. See
http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Pacemaker_Explained/ch15.html
for details. But this depends on many factors, including distance
between sites.

> My requirement:
>  would like to have a single virtual IP address for accessing the Linux
> servers and only active must have VIP(virtual IP address)
>

You can't move IP address into different subnet and expect it to work.
You would need to implement something like VXLAN, but then your
servers are in the same (VXLAN) subnet. You can configure same
resource with different IP addresses on each site and use e.g. DDNS to
update it.

> Can pacemaker transfer the virtual IP address to new active  when the
> current active fails.? If so,  how can the same virtual IP address be
> accessible from the client since it has now moved to a different subnet.?
> If the above use case cannot be supported by the pacemaker what are the
> possible options i need to look at.?
>
> Thank you so much for the help,
> Bhargav
>
>
>
>
>
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