Re: [Xen-users] Re: creating a xen failover with lookback images

[Heiko <rupertt@xxxxxxxxx>]

On Thu, Jul 24, 2008 at 7:19 PM, Daniel Asplund <danielsaori@xxxxxxxxx> wrote:
>>> Hello,
>>> i want to setup a VM which has another VM as failover.
>>> We use images where we store the VM in.
>>> Most people use drbd and heartbeat for this, is this the best solution
>>> fors this?
>>>
>>> When I use XEN images, how do I have to define the image in drbd?
>>>
>>>  on ares.bluethings.net {
>>>    device     /dev/drbd0;
>>>    disk       /dev/sda5;
>>>    address    172.16.6.2:7788;
>>>    flexible-meta-disk  internal;
>>>  }
>>>
>> Am I right that the guy in this
>> http://marksitblog.blogspot.com/2007/07/mysql-5-high-availability-with-drbd-8.html
>> guide is using drbd inside the VM to mirror the /dev/sda1 inside the VM?
>>
Hi Daniel,
i reinstalled both servers and now have LVM.
Since I dont use the Xen-tools and use CentOS, i would like to install
the VM with virt-install,
I started the installation with:

virt-install \
--name=ticketsystem \
--ram=2000 \
--file=/dev/vg01/lv_myVM \
--vcpus=2 \
--os-variant=centos5 \
--nographics \
--location ftp://wftp.tu-chemnitz.de/pub/linux/centos/5.2/os/x86_64/ \

it ran thorugh, now I did shut it down and changed the VM config:

disk = [ "drdb:ticketsystem,xvda1,w" , "file:/VM/ticketsystem_swap.img,xvda2,w"]

[root@pc] xm create ticketsystem -c
Using config file "/etc/xen/ticketsystem".
No handlers could be found for logger "xend"
Error: Disk isn't accessible

It looks like xend doesnt like the drbd thing?

how can i get this working?

thx

>> thx
>>
>
> Yeah, he is running DRBD inside the VM to allow for failover with
> heartbeat of the VMs.
>
> I believe using LVM, DRBD and heartbeat is the best solution for this,
> it will give you a very flexible solution. I run this myself. Not
> inside the VMs but on the Dom0 nodes. But the principle is the same
> when configuring it. Cool solution would be to run a cluster both on
> the Dom0s and inside the DomUs, maybe something to try. :)
>


> Please have a look at my XEN cluster guide at:
> http://www.asplund.nu/xencluster/xen-cluster-howto.html
> It is not fully complete but maybe you can get some ideas about the DRBD 
> setup.
>
> Cheers, Daniel
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users