<!doctype html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<div>
<br>
</div>
<blockquote type="cite">
<div>
On 16/01/2020 20:46 Alexander Dalloz <
<a
href="mailto:ad+lists@uni-x.org">ad+lists@uni-x.org</a>>
wrote:
</div>
<div>
<br>
</div>
<div>
<br>
</div>
<div>
Am 16.01.2020 um 18:04 schrieb Kishore Potnuru:
</div>
<blockquote type="cite">
<div>
I need your help on my issue very badly.
</div>
<div>
<br>
</div>
<div>
I have the dovecot version 2.0.9 installed on RHEL linux 6.10 version.
It's
</div>
<div>
a single Live server. I need to add a load balancer by adding another
</div>
<div>
server for resilience.
</div>
<div>
<br>
</div>
<div>
I cannot upgrade the dovecot version at this time as it is a single live
</div>
<div>
server. If something goes wrong, I will be in trouble.
</div>
<div>
<br>
</div>
<div>
Basically the requirement/issue is:
</div>
<div>
<br>
</div>
<div>
a) it's a single live dovecot POP3/IMAP server
</div>
<div>
b) people are accessing their emails from microsoft outlook (by giving the
</div>
<div>
same server name as IMAP and SMTP server). But more than 100000 emails will
</div>
<div>
be travelled/routed.
</div>
<div>
c) This server is not rebooted from couple of years.
</div>
<div>
d) Now they are worried about, just in case if the server is having any
</div>
<div>
issues during the reboot
</div>
<div>
or
</div>
<div>
if something goes wrong with the server in any case, there will be huge
</div>
<div>
issues.
</div>
<div>
<br>
</div>
<div>
e) They would like to create resilience by adding another server and emails
</div>
<div>
will be travelled from both the servers. If one server is having any issues
</div>
<div>
due to any technical issue and if it doesn't come back easily, then the
</div>
<div>
emails will be travelled through the other server and there will no
</div>
<div>
disturbance to the emails. atleast it travels from the other server.
</div>
<div>
<br>
</div>
<div>
I have very less knowledge on this. Could you please help me providing the
</div>
<div>
best solution for this.
</div>
<div>
<br>
</div>
<div>
I will wait for your reply. Please please please help me.
</div>
<div>
<br>
</div>
<div>
Thanks,
</div>
<div>
Kishore Potnuru
</div>
</blockquote>
<div>
Don't take it personal Kishore, you probably just inherited that
disaster.
</div>
<div>
<br>
</div>
<div>
RHEL 6.10 is really old and thus your dovecot version ancient and
</div>
<div>
unsupported by upstream. RHEL 6.10 is going EOL by end of Nov this year.
</div>
<div>
And I am not sure that system is really a clean 6.10 if it hasn't been
</div>
<div>
rebooted since several years as you state.
</div>
<div>
<br>
</div>
<div>
Load balancing will not solve your issue. Migrate away from that host to
</div>
<div>
a fresh new install with a more current OS and dovecot release. Spin up
</div>
<div>
the new system, configure dovecot properly, sync the mail over from the
</div>
<div>
old system to the new one. Plan a maintenance downtime where you do a
</div>
<div>
final sync and then replace the old host with the new one which you give
</div>
<div>
the same identity. The downtime will be minimal.
</div>
<div>
<br>
</div>
<div>
Alexander
</div>
</blockquote>
<div>
<br>
</div>
<div>
This is probably best plan.
</div>
<div class="io-ox-signature">
<pre>---
Aki Tuomi</pre>
</div>
</body>
</html>
Kishore Potnuru
2020-Apr-22 13:12 UTC
Load balancer for dovecot servers - Not able to send emails
Hi All, I need your help on one of the issue in Dovecot. I have the dovecot version 2.0.9 installed on RHEL linux 6.10 version. It's a single/standalone Live server. Now I have created another server with the same configuration for the resilince purpose. I also tested and I am able to send the emails to both of the dovecot servers separately/individually. They are working fine. Now I have added those two servers under a F5 load balancer and created a FQDN (example: testing.test.com). I changed the rules to send the traffic to FQDN "testing.test.com", where it should redirect the email to one of those 2 servers. When I sent the email to FQDN "testing.test.com", I am getting the below error. pf1_inbd/smtp[30292]: 66A5F5F6: to=<xxxxx at yyy.com>, relay=testing.test.com[xxx.xxx.xxx.xxx]:25, delay=13, delays=0.09/0.08/13/0, dsn=4.4.2, status=deferred (lost connection with testing.test.com [xxx.xxx.xxx.xxx] while receiving the initial server greeting) Could you please let me know how to fix this issue? It's a great help for me. Thanks & Regards, Kishore Potnuru>-------------- next part -------------- An HTML attachment was scrubbed... URL: <https://dovecot.org/pipermail/dovecot/attachments/20200422/5e2fbdf2/attachment.html>
Alexander Dalloz
2020-Apr-22 17:14 UTC
Load balancer for dovecot servers - Not able to send emails
Am 22.04.2020 um 15:12 schrieb Kishore Potnuru:> Hi All, > > I need your help on one of the issue in Dovecot.Why do you send that request to me personally in Cc:?> I have the dovecot version 2.0.9 installed on RHEL linux 6.10 version. It's > a single/standalone Live server. > > Now I have created another server with the same configuration for the > resilince purpose. I also tested and I am able to send the emails to both > of the dovecot servers separately/individually. They are working fine. > > Now I have added those two servers under a F5 load balancer and created a > FQDN (example: testing.test.com). I changed the rules to send the traffic > to FQDN "testing.test.com", where it should redirect the email to one of > those 2 servers. > > When I sent the email to FQDN "testing.test.com", I am getting the below > error. > > pf1_inbd/smtp[30292]: 66A5F5F6: to=<xxxxx at yyy.com>, > relay=testing.test.com[xxx.xxx.xxx.xxx]:25, > delay=13, delays=0.09/0.08/13/0, dsn=4.4.2, status=deferred (lost > connection with testing.test.com [xxx.xxx.xxx.xxx] while receiving the > initial server greeting)That's the MTA on port 25 not reacting as it should. That's no dovecot iisue.> Could you please let me know how to fix this issue? It's a great help for > me. > > Thanks & Regards, > Kishore PotnuruAlexander
Kishore Potnuru
2020-Apr-23 15:26 UTC
Fwd: Load balancer for dovecot servers - Not able to send emails
Hi All, I need your help on one of the issue in Dovecot. I have the dovecot version 2.0.9 installed on RHEL linux 6.10 version. It's a single/standalone Live server. Now I have created another server with the same configuration for the resilince purpose. I also tested and I am able to send the emails to both of the dovecot servers separately/individually. They are working fine. Now I have added those two servers under a F5 load balancer and created a FQDN (example: testing.test.com). I changed the rules to send the traffic to FQDN "testing.test.com", where it should redirect the email to one of those 2 servers. When I sent the email to FQDN "testing.test.com", I am getting the below error. pf1_inbd/smtp[30292]: 66A5F5F6: to=<xxxxx at yyy.com>, relay=testing.test.com[xxx.xxx.xxx.xxx]:25, delay=13, delays=0.09/0.08/13/0, dsn=4.4.2, status=deferred (lost connection with testing.test.com [xxx.xxx.xxx.xxx] while receiving the initial server greeting) Could you please let me know how to fix this issue? It's a great help for me. Thanks & Regards, Kishore Potnuru>-------------- next part -------------- An HTML attachment was scrubbed... URL: <https://dovecot.org/pipermail/dovecot/attachments/20200423/31df5d63/attachment-0001.html>
Maybe Matching Threads
- Fwd: Load balancer for dovecot servers - Not able to send emails
- Fwd: Load balancer for dovecot servers - Not able to send emails
- Fwd: Load balancer for dovecot servers - Not able to send emails
- Dovecot Load balancing - Please Please Please help me
- Migration from one server to 2 new servers