Re: SquirrelMail and NFS

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> In order to build a more resiliant hosting environment, I built two
> identical mail servers, each running ubuntu 8, postfix, courrier,
> squirrelmail, mysql, etc. They work great as documented for virtual domain
> hosting. My second phase was to build a third server housing the mysql user
> database as well as the directories for the mail homes for each domain. I
> would then expoirt via NFS to each front end mail server (mysql disabled on
> each for phase 2, and they authenticate against the singel mysql database
> server). Using simple pop, etc this setup works fine. But, when using
> squirrelmail as a front end, I get an error after a successful
> authentication. The web page is blank except for an error saying
> "Squirrelmail: Error" in the browser tab.

Are you asking for advice on building clustered mail server systems or
for how to fix this problem?  Your email reads like the former.  The
latter can only be solved if you get information about the issue from
your web server logs per the mailing list posting guidelines, but it
might be related to faulty (or lack of?) session tracking between the
web servers, etc.  But seriously, if you think telling us you get
"Squirrelmail: Error" is going to help us help you...

> Thie happens on both IE and
> Firefox. Squirrelmail works fine when the mail homes are local to a front
> end server and not accessed via NFS. I also confirmed that the NFS mounts
> have read/write capability from the front end servers, so it 's not a
> permissions problem.
>
> Any advice on Squirrelmail and NFS? What's the alternative to build this out
> to be more resiliant?

Put PHP sessions in the DB or share the PHP session directory over NFS.

> And for those who want to say that "The single database server is a single
> point of failure" - this server is a Sun v490 with a 3510 array so it's got
> plenty of redundancy. It's less likely that this server will fail as
> compared to the 1U boxes on the front end.

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