I believe this behavior is governed by cloud-init. The network config
with the mac address is created by cloud-init. I know that cloud-init
will reconfigure networking it if believes the image is launched as a
new instance. I am not aware of the expected behavior with the removal
of the primary interface and replacement with another on the same
instance.
** Also affects: cloud-init (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1841582
Title:
Interface detach and attach does not work with CentOS 7 and Ubuntu
18.04 cloud images
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