SYSTEM INFORMATION | |
---|---|
OS type and version | Almalinux |
Webmin version | 2.401 |
Virtualmin version | 7.30.8 PRO |
Webserver version | Apache 2.4.62 |
Related packages | SUGGESTED |
I will try to post here the problems and solutions that I find when migrating my old Centos to a new Almalinux.
I hope this will be helpful for anyone in my situation who wants to do a similar migration.
From here I want to thank @joe @Ilia @eric @jamie and @tpnsolutions that without their help this diary would not have been possible, thanks to the support of Virtualmin I have been able to face this challenge again (it will be 10 years since the last one). Please correct me if I misunderstood something and it’s not right
I have to transfer more than 50 domains from an old Centos to a new Almalinux, the chosen method is to mount two servers in parallel each one with its corresponding wan ip and go transferring domains, each server takes care of its web, mail and DNS and each server has a local ip in a DMZ behind two firewalls each one with its WAN IP that is responsible for passing through NAT the ports I need and control the accesses
First failure:
While I was testing Alma9 Alma10 comes out, I didn’t have it decided because it’s not supported yet, but some comments in favour made me play the roulette, of course it didn’t work
Basically postgrey and mail limiting can’t be installed, plus I learn that the webmin repository must not be activated.
Back to Alma9
Basically I have problems with mail delivery/reception, first problem I have is that firewalld is enabled by default and doesn’t let me pass the mail access ports, as I have a firewall in front of me I manage the accesses there I disable it.
Problems with mail delivery
Basically the new postfix comes with too high default access requirements for clients and production servers, so I have to lower those requirements.
SMTPUTF8 is required, but was not offered by host
Solution:
I view this info → Issue - SMTPUTF8 is required, but was not offered by host | Plesk Forum
Postfix Backwards-Compatibility Safety Net
and change /etc/postfix/main.cf → compatibility_level=2 to 0 and →
postconf smtputf8_enable=no
postfix reload
Outlook error POP3 Server Error: 0x800CCC90, Error Number: 0x800CCC92
Outlook clients with plaintext login can not download POP3 mails
Solution:
Edit /etc/dovecot/dovecot.conf, add parameter named “disable_plaintext_auth = NO”
Apply and restart service Dovecot
And go to Webmin → Servers → Dovecot IMAP/POP3 Server → User and Login Options → Change Minimum valid UID to 500, (by default its a 1000)