CentOS - Feb 2006 - Heartbeat and mount --bind for NFS v4.

Hi all.

This is probably more of a HA list, or possibly even linux-practices,
question but all hosts concerned are running CentOS and I reckon some
of you guys might have some good suggestions. Feel free to tell me to
piss off. :)

I'm building a new CentOS, DRBD, Heartbeat and NFS HA cluster. We
already have boxes running similar setups on FC2/3 running NFS v2/3
with the Ultra Monkey Heartbeat packages. These new systems are using
CentOS packages as much as possible.

[root at tempmailstore1a ha.d]# rpm -qa | grep -Ei 'heartbeat|drbd'
heartbeat-pils-1.2.3.cvs.20050927-1.centos4
heartbeat-ldirectord-1.2.3.cvs.20050927-1.centos4
heartbeat-stonith-1.2.3.cvs.20050927-1.centos4
heartbeat-1.2.3.cvs.20050927-1.centos4
kernel-module-drbd-2.6.9-22.0.1.ELsmp-0.7.14-1.centos4
drbd-0.7.14-1.centos4

I'm messing around with NFS v4 (any and all experience/horror stories
about EL4's NFS v4 in production environments more than welcome as I'm
still at the evaluation/test stage) and looking at the best way to
setup the --bind mounts for the NFS v4 pseudofilesystem.

So far in /etc/ha.d/haresources I have...

tempmailstore1a IPaddr::192.168.24.73                                 
         \
        drbddisk::r0                                                           \
        Filesystem::/dev/drbd0::/mnt/drbd::ext3::rw,acl,data=journal    \
        portmap                                                                \
        nfslock                                                                \
        nfs                                                                    \
        rpcidmapd

Now, after the Filesystem resource.d script's called ideally I'd like
to setup the --bind mounts as detailed here...

http://www.citi.umich.edu/projects/nfsv4/linux/using-nfsv4.html

As follows...

mount --bind /mnt/drbd /export/drbd

I would've thought the best way to achieve this, since it's
effectively another filesystem of type "none" when mounted would be
with the resource.d/Filesystem script... which can't take a --mount
option.

Obviously I can hack around in the shell script or write my own, has
anyone else bumped up against this? And how did you deal with it.

Will.

On 08/02/06, Will McDonald <wmcdonald at gmail.com>
wrote:
> I'm messing around with NFS v4 (any and all experience/horror stories
> about EL4's NFS v4 in production environments more than welcome as
I'm
> still at the evaluation/test stage) and looking at the best way to
> setup the --bind mounts for the NFS v4 pseudofilesystem.
Just found the answer to my own question...

https://www.redhat.com/archives/fedora-list/2003-October/msg00957.html

"mount --bind" is the same as "mount -o bind"

So I can just have bind as an option in haresources for that particular mount.

I'd still be interested in hearing other's opinions on NFS v4 in
production environments.

Will.