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Home > Archive > Unix Programming > May 2005 > Record locking and mounted file systems
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Record locking and mounted file systems
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| entropy 2005-05-26, 6:00 pm |
| Linux Red Hat Enterprise AS 3
I'm running an image from an NFS-mounted filesystem, which is
attempting to lock/unlock records in a POSIX shared memory segment in
/dev/shm on the local machine.
I'm getting "No locks available" instead of the happiness that
happens when I run the image from a local filesystem. I'm reading
Steven's APUE sec. 12.3 right now, but if there are other references
(or discussion) that can hasten me to a solution I'd be grateful.
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| entropy 2005-05-26, 6:00 pm |
| entr@py.invalid wrote...
> Linux Red Hat Enterprise AS 3
>
> I'm running an image from an NFS-mounted filesystem, which is
> attempting to lock/unlock records in a POSIX shared memory segment in
> /dev/shm on the local machine.
>
> I'm getting "No locks available" instead of the happiness that
> happens when I run the image from a local filesystem. I'm reading
> Steven's APUE sec. 12.3 right now, but if there are other references
> (or discussion) that can hasten me to a solution I'd be grateful.
BTW, I'm using fcntl() for this, not flock().
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| Roger Leigh 2005-05-26, 6:00 pm |
| -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
entropy <entr@py.invalid> writes:
> entr@py.invalid wrote...
>
> BTW, I'm using fcntl() for this, not flock().
Good!
You need to make sure that both the client and server are running
lockd, and that both the client and server lockds can communicate.
Check your logs, and hosts.allow|deny.
- --
Roger Leigh
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| entropy 2005-05-31, 2:48 am |
| ${rleigh}@invalid.whinlatter.ukfsn.org.invalid wrote...
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
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> entropy <entr@py.invalid> writes:
>
>
> Good!
>
> You need to make sure that both the client and server are running
> lockd, and that both the client and server lockds can communicate.
> Check your logs, and hosts.allow|deny.
Lockd is indeed running on both client and server, logs are clean,
and hosts.allow|deny don't seem to be at fault. I've also pissed off
the ever-sensitive SAs now too, by implying something's wrong with
NFS that they don't know about. 
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