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

[evdhn at advalvas.be]

> 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 -
>>>>>----------------------------------------------------------------------
>>>>
>>>>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 -
>>>----------------------------------------------------------------------
>>
>>
>> It must be a RH HA thing then.
>>
>> # showmount -e arneb
>> Export list for arneb:
>> /usr/local/lepus-bb                          arneb,nihal
>> /usr/local/lepus-bb/server                   gienah,albireo,sair,ruchba
>> /usr/local/lepus-bb/content                  gienah,albireo,sair,ruchba
>> /usr/local/lepus-bb/sessions                 gienah,albireo,sair,ruchba
>> /usr/local/lepus-bb/course_image_main_images gienah,albireo,sair,ruchba
>>
>> Even when I specify that all nodes ("*") should have access, it still
>> won't work. :-(
>
> I'm not certain what HA means by "service", but generally, NFS mounts
> specify the remote end as "nodename:/export", not as "service:/export".
> Try:
>
> 	mount -t nfs arneb:/usr/local/lepus-bb /usr/local/bb
>
> on nihal and see if that works.  It should.  Also make sure that the
> server (arneb) is running nfsd.  The existance of an exports file should
> trigger it.
> ----------------------------------------------------------------------
> - Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
> ----------------------------------------------------------------------
A service (= linux, Tru64 terminology, = resource group on aix, = packages
on HP UNIX if I remember correctly) roughly is a collection of a virtual
ip-address (alias), disk devices, and application processes, that can be
accessed through the virtual ip-address.
In my current situation, arneb and nihal are hostnames, lepusbb is an
alias (normally on eth0:1 when the service runs on arneb).

RH HA is explained in:
http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/pdf/rh-cs-en.pdf

Kind regards,

emma


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