Re: [OSR-devel] IPs in cluster.conf and manual startup

[Mark H. <hla...@at...>]

On Monday 22 October 2007 09:48:32 go...@bo... wrote:
> I'm in a position where I have to move my GFS volume from one SAN to
> another, on a different IP block.
>
> If my IP for the SAN and cluster operation is assigned by DHCP, do I have
> to specify it in cluster.conf anyway? Or is specifying the MAC address
> sufficient? Or do I specify something like "dhcp" as the IP address?
Yes, it should be possible to use dhcp by adding this:
<eth name="eth0" ip="dhcp" mac="yourmacaddress" />
Please note, that defining a mac address is mandatory, because it defines the 
node in the cluster.

>
> If the cluster doesn't come up normally and I'm stuck in the initrd boot
> image, is there a documented list of procedures on how to get from there
> to mounting the GFS root volume in the right place sufficiently (i.e.
> including the host speciffic files, such as /etc/modprobe.conf) to re-make
> the initrd?
You need to do the following steps:
1. mount your rootfs to /mnt/newroot if the cluster software fails to start, 
use the lockproto=lock_nolock option to mount the fs. But make sure it's the 
only node mounting the filesystem ;-) )
# mount -t gfs -o lockproto=lock_nolock /dev/foo /mnt/newroot
2. mount --bind /dev /mnt/newroot/dev
3. mount -t proc proc /mnt/newroot/proc
4. mount -t sysfs none /mnt/newroot/sys
5. mount --bind /mnt/newroot/cluster/cdsl/<nodeid> /mnt/newroot/cdsl.local
6. chroot /mnt/newroot
7. you can make your changes and build new initrd in the chroot

Hope that helps,

Mark


-- 
Gruss / Regards,

Dipl.-Ing. Mark Hlawatschek
http://www.atix.de/
http://www.open-sharedroot.org/

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