nfs mount locally exported directories in a Red HAt Cluster (v3)?

[Rick Stevens]

evdhn at advalvas.be wrote:
>>evdhn at advalvas.be wrote:
>>
>>>In a Red Hat HA Cluster (v3), how can you nfs mount a directory exported
>>>by a cluster service that is currently local to the cluster member?
>>>I keep getting permission denied errors.  It works fine when I move the
>>>cluster service to the other cluster member.  The firewall has been
>>>stoppped, just to make sure it wasn't part of the problem.
>>
>>Make sure you have portmapper and nfslock running on both the client and
>>server.  That's the most common problem.
>>----------------------------------------------------------------------
>>- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
>>- VitalStream, Inc.                       http://www.vitalstream.com -
>>-                                                                    -
>>-           Denial.  It ain't just a river in Egypt anymore!         -
>>----------------------------------------------------------------------
> 
> 
> Thanks for your answer Rick, but apparently I explained poorly.
> 
> This is a two-member cluster with hostnames arneb and nihal and services
> lepusbb and lepustl.
> When service lepusbb runs on arneb, I cannot nfs mount its device on arneb
> using the service name.  I.e.
> # mount -t nfs lepusbb:/usr/local/lepus-bb /usr/local/bb
> does not work on arneb, but it does work on nihal.
> Similarly, I can mount lepustl:/usr/local/lepus-tl on arneb but not on nihal.
> 
> I meanwhile found that
> # mount -t nfs arneb:/usr/local/lepus-bb /usr/local/bb
> does work, so I'm currently using that as a workaround, but obviously,
> when a failover would occur while the devices are locally mounted, my
> scripts wil be in trouble.
> 
> And yes, portmapper and nfslock are running:
> # ps auxw | egrep -e lock -e portm | grep -v grep
> rpc       3109  0.0  0.0  1672  608 ?        S    10:36   0:00 portmap
> root      3314  0.0  0.0     0    0 ?        SW   10:36   0:00 [lockd]
> root      3453  0.0  0.0  3064 3064 ?        S<L  10:36   0:00
> /usr/sbin/clulockd

First, are you sure the device is being exported by arneb and that arneb
is permitted to mount it?  A "showmount -e arneb" will show what's being
exported and who's allowed to look at it.

I'm not familiar with RH's HA (high availability) structure so I can't
speak to the details, but generally it's something along those lines.
----------------------------------------------------------------------
- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-         "If you can't fix it...duct tape it!"  - Tim Allen         -
----------------------------------------------------------------------