On Tue, 2021-02-23 at 00:02 +0100, Kevin Kofler via devel wrote: > Well, this silent fallback behavior is one of the reasons I have > refused to > use systemd-resolved at all so far. > > The issue with the cloud setups would also have been caught much > earlier if > it had failed right away and not silently used an external DNServer. > Ignoring broken configuration and just using the default is not > useful error > handling.
I guess having a fallback is a double-edged sword. On one hand, indeed, this issue with broken cloud-init would have been caught earlier, but on the other hand, some people couldn't care less which DNS servers are being used if things "just work". > > And the real issue is that systemd-resolved has broken cloud-init, so > cloud-init needs to be fixed/updated. Yes, this is the main issue for cloud setups. However, enabling/disabling a fallback is still an issue on its own. I wouldn't add much more since I think Lennart summed that up pretty well in his post. > It is unfortunate that this behavior has changed in an update. This is the thing that is probably hurting users the most. They have a working F33 cloud instance and after systemd is upgraded, the instance will *probably* (i.e. if users didn't configure DNS themselves and relied on cloud-init) be heavily broken, i.e. DNS resolution not working. I actually think it would still be beneficial to flip this change, i.e. remove the "-Ddns-servers=" line (https://src.fedoraproject.org/rpms/systemd/blob/f33/f/systemd.spec#_372 ), for the next F33 systemd update. > This has > happened because all the complaints about the old behavior back when > the > Change proposal was discussed (i.e., BEFORE Fedora 33 was released) > were > completely ignored by the Change owners and by FESCo (even though the > fix > was apparently a one-line change that could easily have been made > before the > release). I didn't follow that so I can't comment on it.
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