Moving from CentOS to Ubuntu 22.04 LTS (SNI and email improvements)

CentOS Linux 7.9.2009
Webmin version 2.105 Usermin version 2.005
Virtualmin version 7.9.0 Authentic theme version 21.09.5
Operating system Ubuntu Linux 22.04.3
Webmin version 2.105 Usermin version 2.005
Virtualmin version 7.9.0 Authentic theme version 21.09.5

I’ve been dragging my feet to switch from Centos and finally did it with some help from my long-time Upwork server admin. I moved most of my domains from Centos to Ubuntu. We used the Virtualmin features to transfer. The only manual changes were to Apache to allow the new references that did not exist on Centos. That restricted letsencrypt to renew the old domain names and mail.* was enabled once the Apache changes were effected.

Now, all my domains have their own email server domain addresses with Letsencrypt certs. I’m writing this because anyone who wants to move from Centos but is hesitant should just get it done. It is super easy/fast. Be sure to have some help if you aren’t an expert but I had no real issues once the first domain was tested.

I had to make a few updates on Spamassassin and Fail2ban but that was because they are now using more current versions on the Ubuntu server.

I’m super happy with how fast the transfers went and I checked the two sites then deleted the old Centos versions of each domain as they were verified.

Both old and new servers are hosted on Linode (akamai) and I learned Linode has native AWS backup at specific server locations. I am hosted at Linode Dallas which does not support this feature so we’re moving it to Atlanta (button push) for native AWS backup. AWS backs up nightly and I can pull files or directories and have done that in the past. The Linode backup service restores the entire server. Currently, I use duply on Centos to backup to AWS. Moving to native backup on Linode avoids duply but uses my existing AWS account. Just plug in my AWS credentials to the Linode form (I’m told).

I’m using Virtualmin GPL version but I will update my donation again using paypal to


Virtualmin just works so well and it deserves way more attention for how well it gets supported. I compare performance with other apps and Virtualmin just works well and support is superior to any software I’ve used. I started with IBM 360 BTW. Super big thanks.


Would you be more comfortable to move to something like Rocky. Also the subject is incorrect, you’re moving to 22.04, not 20.04.

Thank you for your kind words! It means the world to us!

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Rocky, perhaps. I am not skilled enough to know the benefits. What I do know, and that is my point, is that Virtualmin works well for me and the transfer from Centos was an obstacle on my to-do list. It is wonderful to have these choices. Title changed.

Yep, the Backup and restore would well. I’ve restore to Ubuntu and Debian (from my Rocky/Centos installs) with no issues that Ive seen (for testing purposes only). Rocky and Almalinux are like Centos, RHEL clones. So layout and commands are basically the same.

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