[DRBD-user] Re: Just making sure DRBD is the right project for me... ; -)

[Evert Meulie]

Just wondering about your script. Will it only failover if a vserver is non-responsive, or also as soon as one of the vservers is stopped manually?

Regards,
	Evert


Helmut Wollmersdorfer wrote:
> Evert Meulie wrote:
>  > http://linux-vserver.org/Vserver+DRBD looks promising, since 90% of
>  > the changes will be made in the vservers on the node
> 
> IMHO the synchronization alone is not a reason for using vserver or XEN.
> Virtualization techniques also have some disadvantages like more complex 
> network configuration.
> 
> If there would not be a need to consolidate a server (with root access 
> by a foreign person) into my cluster, I would be happy with rsyncing 
> /etc, syncing the packages with the Debian style [get|set]-selections, 
> and using DRBD for service related data files.
> 
>> Would it also work to mount the DRBD device as /var/lib/vservers, 
>> instead of /var/lib/vservers/<vserver-name> , and hereby take all 
>> vservers in 1 go?
> 
> 
> Yes, mirroring /var/lib/vservers was my first test configuration.
> 
> But keep in mind, that in such a case _all_ vservers will failover (and 
> 'boot' more or less slowly). This means, that a crash of a single 
> vserver causes unnecessary failovers of the other vservers.
> 
> Also I only have test experience with such a configuration.
> 
> Here is my /etc/ha.d/resource.d/vserver script:
> ----snip----
> #!/bin/bash
> #
> # This script is intended to be used as resource script by heartbeat
> #
> # Jan 2005 by Helmut Wollmersdorfer.
> #
> ###
> 
> VSERVER="/usr/sbin/vserver"
> 
> RES="$1"
> CMD="$2"
> 
> case "$CMD" in
>     start)
>         $VSERVER $RES start
>     ;;
>     stop)
>         # exec, so the exit code propagates
>     exec $VSERVER $RES stop
>     ;;
>     status)
>         $VSERVER $RES status | grep running > /dev/null
>     if [ $? -eq 0 ]
>     then
>         echo "running"
>     else
>         echo "stopped"
>         fi
>     ;;
>     *)
>     echo "Usage: vserver VSERVER-NAME {start|stop|status}"
>     exit 1
>     ;;
> esac
> 
> exit 0
> ----snap----
> 
> Helmut Wollmersdorfer