AlmaLinux?

On 2021-10-07 1:30 a.m., Marc wrote:

With redhat 'dumping' the support for centos and the availability of 
containers. I thought about reconsidering my default dovecot setup.

Since the concept of having a lts distribution that is supported by 
redhat/centos is more or less 'unavailable'. I thought about using the repo of 
dovecot with centos8stream.

os
==
For now I stick with centos8stream, just because the rest is still on centos7 
support and the ceph development team is using it as a default. (And can't yet 
let go of the idea this closest to professional distro ;))

auth uid gid os
===============
I am not really convinced that storing users in mysql/postgres is a better 
alternative than having linux do auth. I also think it is good to have mailbox 
files stored with different uid's (no idea if this is even the case when 
dovecot is using mysql/maria/postgres)

Normally I would use a synced ldap server on the vm for authentication. But I 
was thinking of using now an external ldap task from the container environment. 
To de-duplicate services/data and make the environment simple. Since rh is 
moving to a different ldap server, it would be good to have this seperated in 
the future.

New to me is the sssd, used nscd/nslcd for decades without issues.

I guess the best solution is to have the os uid/gid coming from sssd, configure 
sssd to have a huge timeout if the backend ldap auth is not available. What is 
your thought about this?

auth uid gid dovecot
====================
I do not really have an idea if I should have dovecot use ldap directly or use 
this sssd pam? The advantage of using ldap directly is you could maybe skip 
identifying users in the os. But maybe then tools like dovadm that require a 
user are not working anymore.
 From the keep it simple perspective it is probably better to use sssd. However 
centos8stream and sssd are not really known to me. So any ideas/advice about 
this?











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