[Dovecot] Xen + NFS

[Eric]

Thanks for Dovecot!

I am currently testing several scenarios to help determine how to best implement dovecot for our environment. One scenario of particular interest is Maildir + NFS, load balanced between several servers running dovecot.

I am not sure anyone would ever want to implement what I am about to describe here, but none-the-less, I thought I would mention it to the list to see if anyone has had the same experience, or could possibly help.

What I am using to _test_ is a single server running RedHat Server 5 + Xen. Dom0 is acting as my NFS server, and a RedHat Server 5 guest running on the same machine is acting as my NFS client and dovecot server. I have a single directory exported from the NFS server which contains several home folders with inboxes stored in Maildir format.

The problem I am having is when I open a POP3 connection from a separate machine, I see the following messages on the virtual server in /var/log/maillog and I am unable to retrieve mail:

file maildir-uidlist.c: line 139 (maildir_uidlist_unlock): assertion failed: (uidlist->lock_count > 0)

and more often:

Mailbox init failed top=0/0, retr=0/0, del=0/0, size=0

It appears to be an issue with the login not having the proper permissions to create the dovecot.uidlist file, however, when I log in locally to the dovecot server with the POP3 account, I can read+write in the directory without problems.

I suspect that I am missing something simple, but cannot seem to figure it out.

dovecot-1.0-1.2.rc15.el5
RedHat Server 5
kernel: 2.6.18-8.1.14.el5xen

dovecot -n:
shutdown_clients: no
login_dir: /var/run/dovecot/login
login_executable(default): /usr/libexec/dovecot/imap-login
login_executable(imap): /usr/libexec/dovecot/imap-login
login_executable(pop3): /usr/libexec/dovecot/pop3-login
login_greeting: Server ready.
mail_location: maildir:~/.maildir:INDEX=/var/spool/dovecot/%u
maildir_copy_with_hardlinks: yes
mbox_write_locks: dotlock fcntl
mail_executable(default): /usr/libexec/dovecot/imap
mail_executable(imap): /usr/libexec/dovecot/imap
mail_executable(pop3): /usr/libexec/dovecot/pop3
mail_plugin_dir(default): /usr/lib/dovecot/imap
mail_plugin_dir(imap): /usr/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/pop3
pop3_reuse_xuidl(default): no
pop3_reuse_xuidl(imap): no
pop3_reuse_xuidl(pop3): yes
pop3_lock_session(default): no
pop3_lock_session(imap): no
pop3_lock_session(pop3): yes
auth default:
  passdb:
    driver: ldap
    args: /etc/dovecot-ldap.conf
  userdb:
    driver: ldap
    args: /etc/dovecot-ldap.conf

nfs mount options: rw,rsize=32768,wsize=32768,hard,fg,lock,nfsvers=3,tcp,retrans=0,noac



       
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