On Tue, 13 Aug 2019 10:04:03 +0200 Bastian Blank <wa...@debian.org> wrote: > - cloud-init write the config file using a name that is ignored by > ifupdown. The filename is "50-cloud-init.cfg" and everything with "-" > or "_" in it is ignored. (wtf?)
No, it's the other way around: File names may *only* include alphanumeric and "-" + "_" but not a dot. So the ".cfg" is the part that is causing the problem. This has already been addressed upstream, see https://github.com/canonical/cloud-init/commit/a6faf3acef02bd8cd4d46ac9efeebf24b3f21d81#diff-6bf578623d31fa6e19b21138b2c41e8e So I'd suggest to backport this patch: https://github.com/canonical/cloud-init/commit/a6faf3acef02bd8cd4d46ac9efeebf24b3f21d81.patch Best regards, Christian