[DRBD-user] three node backup setup without public/internal IP address

[raulhp]

Hi,

This can be a solution, you need to change the port number and the IP 
address for the stacked between first node and the third node.

resource r0 {
>    disk {
>         resync-rate 40M;
>     }
>
>     net {
>         verify-alg sha1;
>         protocol C;
>     }
>
>    on ibis-vstest-01 {
>        device        /dev/drbd0;
>         disk            /dev/sdb1;
>         address        146.107.216.240:7789;
>         meta-disk    internal;
>     }
>
>     on ibis-vstest-02 {
>         device        /dev/drbd0;
>         disk            /dev/sdb1;
>         address        146.107.216.241:7789;
>         meta-disk    internal;
>     }
> }
>
> resource r0-U {
>     net {
>         protocol A;
>     }
>
>     stacked-on-top-of r0 {
>         device        /dev/drbd10;
>         address        146.107.216.242:7789; //Use the first IP 
> address 146.107.216.241 and different port, example 7790
>     }
>
>     on ibis-vstest-03 {
>         device        /dev/drbd10;
>         disk            /dev/sdb1;
>         address        146.107.216.242:7789; //Use different port, 
> example 7790
>         meta-disk    internal;
>     }
> }



Regards,
Ra


El 2014-05-06 14:02, Sven Duscha escribió:
> Hi,
>
> I am trying to set up a three-way redundant DRBD. The way I 
> understand
> it, this is only possible as a primary/secondary-pair with an 
> "external"
> stacked-on-top backup.
>
> resource r0 {
>    disk {
>         resync-rate 40M;
>     }
>
>     net {
>         verify-alg sha1;
>         protocol C;
>     }
>
>    on ibis-vstest-01 {
>        device        /dev/drbd0;
>         disk            /dev/sdb1;
>         address        146.107.216.240:7789;
>         meta-disk    internal;
>     }
>
>     on ibis-vstest-02 {
>         device        /dev/drbd0;
>         disk            /dev/sdb1;
>         address        146.107.216.241:7789;
>         meta-disk    internal;
>     }
> }
>
> resource r0-U {
>     net {
>         protocol A;
>     }
>
>     stacked-on-top-of r0 {
>         device        /dev/drbd10;
>         address        146.107.216.242:7789;
>     }
>
>     on ibis-vstest-03 {
>         device        /dev/drbd10;
>         disk            /dev/sdb1;
>         address        146.107.216.242:7789;
>         meta-disk    internal;
>     }
> }
>
> The problem is that my third node is within the same IP range as the
> other two. Therefore is no dedicated second IP interface with an
> external IP. I then get an error message about a doubly assigned IP 
> address.
>
> Is the a way to create a such setup within the same cluster? I read 
> up a
> bit on the Pacemaker section which proposes a three-way and four-way
> method, though, also intended to be "external". Do I need the 
> commercial
> DRBD-Proxy for the Pacemaker-setup or is this optional?
>
> Cheers,
>
> Sven