I did a few test installs on a staging machine. For whatever reason, Synacor has listed systemd-resolved as a dependency in zimbra-os-requirements which completely bolloxes any other dns setup you may have on the machine (Oh, like using dnsmasq for a split-dns or similar).
If you are using a sane resolver, don't forget to "systemctl mask systemd-resolved" after the OS upgrade and before upgrading Zimbra.
Personally our Zimbra VM uses dnsmasq so it can be replicated in a test environment and still think it's the main machine. When we migrated from Ubuntu 18 to 20 and had to deal with the systemd cancer, we managed to avoid the stupid resolver but now Synacor seems to think it's necessary. It isn't and at least it can be neutered.
Ubuntu 24.04
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umashankar.avagadda
- Zimbra Employee
- Posts: 164
- Joined: Wed Apr 05, 2023 6:29 am
Re: Ubuntu 24.04
Thanks for reporting this.
In Ubuntu 24.04, resolvconf is no longer available, so systemd-resolved was initially added as a replacement dependency. However, since it enforces a specific DNS setup, it can interfere with configurations like dnsmasq.
We are planning to remove the systemd-resolved dependency to avoid impacting existing DNS setups and keep it flexible. This change is targeted for the next release.
In Ubuntu 24.04, resolvconf is no longer available, so systemd-resolved was initially added as a replacement dependency. However, since it enforces a specific DNS setup, it can interfere with configurations like dnsmasq.
We are planning to remove the systemd-resolved dependency to avoid impacting existing DNS setups and keep it flexible. This change is targeted for the next release.
Re: Ubuntu 24.04
Awesome. Thanks for the update. Resolvconf was a pain in the backside also, so I wasn't sorry to see that go either.
Re: Ubuntu 24.04
Thank you.umashankar.avagadda wrote: ↑Thu Apr 02, 2026 7:28 am Thanks for reporting this.
In Ubuntu 24.04, resolvconf is no longer available, so systemd-resolved was initially added as a replacement dependency. However, since it enforces a specific DNS setup, it can interfere with configurations like dnsmasq.
We are planning to remove the systemd-resolved dependency to avoid impacting existing DNS setups and keep it flexible. This change is targeted for the next release.
I haven't checked on Rocky 9 - but I have my split-DNS setup separated out to a dedicated DNS-server, so it doesn't really matter.
I do prefer unbound, though.
Re: Ubuntu 24.04
You've said that before : viewtopic.php?t=70882
Other people use alternatives. Some even promoted by long gone Zimbra employees (back when Zimbra had actual experience in-house.).