Il 25/08/20 16:27, Aki Tuomi ha scritto:

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On 25/08/2020 16:43 Alessio Cecchi alessio@skye.it wrote:

Hi,

I'm running 3 Dovecot director and 6 Dovecot backend on CentOS 6 and Dovecot 2.3.10, with Maildir shared on NFSv3 (on NetApp).

Since CentOS 6 will be EOL on November I started to upgrade to CentOS 7 the first Dovecot backend.

But after Director start to direct users on new CentOS 7 server some errors, for any users, come up, an example:

Aug 21 14:56:41 Error: imap(alessio@cecchi.it) session=<11sBlmKtj1qelGW/>: Mailbox INBOX: Broken or unexpectedly changed file /home/vmail/domains/cecchi.it/alessio/Maildir/dovecot-uidlist line 18664: Invalid data: - re-reading from beginning Aug 21 14:56:41 Error: imap(alessio@cecchi.it) session=<11sBlmKtj1qelGW/>: Mailbox INBOX: Broken file /home/vmail/domains/cecchi.it/alessio/Maildir/dovecot-uidlist line 18664: Invalid data:

Consequently to the error the user see the synchronization of his mailbox again.

The Dovecot version and configuration is the same that in CentOS 6, also the mount parameters are the same, so I suspect that could be some difference in the NFS client implementation on CentOS 7.

This the entry on fstab:

192.168.1.2:/vmail0 /mnt/vmail0 nfs rw,nfsvers=3,noatime,nodiratime,_netdev,nordirplus 0 0 # Bind for vmail0 /mnt/vmail0/domains /home/vmail/domains none x-systemd.requires=/mnt/vmail0,x-systemd.automount,bind 0 0

In the archive of this list I found a similar issue but without a solutions:

https://dovecot.org/pipermail/dovecot/2018-October/113207.html

Do you have any suggestions? Thanks

-- Alessio Cecchi Postmaster @ http://www.qboxmail.it https://www.linkedin.com/in/alessice What versions are you running mixed?

Aki

Hi Aki,

the only mixed version is CentOS version on Dovecot backend:

CentoS 6 backend:

# dovecot -n # 2.3.10 (0da0eff44): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.10 (bf8ef1c2) # OS: Linux 2.6.32-754.29.2.el6.x86_64 x86_64 CentOS release 6.10 (Final)

Centos 7 backend:

# dovecot -n # 2.3.10 (0da0eff44): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.10 (bf8ef1c2) # OS: Linux 3.10.0-1127.18.2.el7.x86_64 x86_64 CentOS Linux release 7.8.2003 (Core)

and also the dovecot configuration is the same (was copied via rsync):

$ diff dovecot-a-cos6.txt dovecot-a-cos7.txt 3,4c3,4 < # OS: Linux 2.6.32-754.29.2.el6.x86_64 x86_64 CentOS release 6.10 (Final) < # Hostname: pop01

# OS: Linux 3.10.0-1127.18.2.el7.x86_64 x86_64 CentOS Linux release 7.8.2003 (Core) # Hostname: pop02 126c126 < import_environment = TZ CORE_OUTOFMEM CORE_ERROR

import_environment = TZ CORE_OUTOFMEM CORE_ERROR LISTEN_PID LISTEN_FDS

I have noticed this, a user have the "Indalid data" error on Centos 7, I moved him to Centos 6, with doveadm director move, and the "Invalid data" error come again also on Centos 6 but only one time, like if the dovecot-uidlist file was wrong and need to be fixed, but after the "fix" executed from Dovecot in Centos 6 the file become fine.

Instead, on Centos 7 the "Invalid data" error comes multiple time.

Thanks

-- Alessio Cecchi Postmaster @ http://www.qboxmail.it https://www.linkedin.com/in/alessice