On 7/8/20 12:53 PM, Kishore Potnuru wrote:
> Hi All,
>
> I request your help on this.
>
> I have 2 dovecot test servers (IMAP protocol) installed with the
> following configuration.
> =============
> [root@devap01 ~]# cat /etc/redhat-*
> Red Hat Enterprise Linux Server release 6.10 (Santiago)
>
> [root@devap01 ~]# dovecot --version
> 2.0.9
>
> [root@devap01 ~]# postconf | grep mail_version
> mail_version = 2.6.6
> ===============
>
> I have another server also "devap02" with the same configuration.
>
> Couple of points/questions/queries here.
>
> 1. I know these servers are having old dovecot versions. I would like
> to upgrade to the latest versions. Could you please suggest the steps
> for upgrading to the latest version in redhat (step by step details
> are helpful please) . If I upgrade to the latest version, will there
> be any impact on the existing configuration/setup?

Check the documents posted here:

https://doc.dovecot.org/installation_guide/upgrading/from-2.0-to-2.1/

https://doc.dovecot.org/installation_guide/upgrading/from-2.1-to-2.2/

https://doc.dovecot.org/installation_guide/upgrading/from-2.2-to-2.3/

Depending on your setup, you may also need to check for changes to
additional software (e.g. amavis)

>
> 2. Now I have added these 2 servers behind the Load Balancer. Enabled
> 110/143 ports on the Load Balancer FQDN (test.pop3.testing.com
> <http://test.pop3.testing.com>) and opened the firewall ports. Here I
> configured IMAP settings from microsoft outlook to see the emails. I
> gave the Incoming Mail Server & Outgoing mail server as
> "test.pop3.testing.com <http://test.pop3.testing.com>". It is
> configured without errors in Outlook. But I see these 2 types issues
> (shared storage & individual storage)
>
>    a) individual separate storage - When I send 10 emails to LB FQDN
> (test.pop3.testing.com <http://test.pop3.testing.com>), the emails are
> going to 2 backend servers. But when i see the emails from Outlook
> inbox, it shows 5 emails from one server for some time. After sometime
> it shows other 5 emails in the inbox. But, I am not able to see all 10
> emails at same time in my inbox. Please suggest how to fix this issue?
> In this scenario, I have separate individual storage in both the servers.

I'm not sure if you've set it up already because it's unclear from the
configuration you posted but, you may wanna have a look at:
https://wiki.dovecot.org/Replication

I suggest using replication after you've upgraded since earlier versions
of dovecot had a few issues.


>    b) common shared storage - I have tried a different scenario also.
> I also have one common NFS storage. So, I have configured that storage
> in both the servers. So when I sent 10 emails, I see all the 10 emails
> from both the servers as it is common shared storage. But, I am not
> getting those 10 emails delivered into my Outlook. I have made all the
> configuration correctly. Please suggest what is the mistake here.
>
> Dovecot.conf
> =========================================================
>
> [root@devap01 ~]# cat /etc/dovecot/dovecot.conf
> disable_plaintext_auth = no
>
> listen = *
> log_path = /var/log/dovecot.log
> mail_location = maildir:/r3/mail/virtual/%d/%n/Maildir/
> passdb {
> args = /etc/dovecot/passwd
> driver = passwd-file
> }
> pop3_uidl_format = %g
> protocols = imap pop3
> ssl = yes
> ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
> ssl_key = </etc/pki/dovecot/private/dovecot.pem
>
> userdb {
> args = uid=vmail gid=vmail home=/r3/mail/virtual/%d/%n
> driver = static
> }
> mail_debug = no
> verbose_ssl = no
> =========================================================
>
> Please help me here.
>
> Thanks,
> Kishore Potnuru