Comment 0 for bug 1675576

1. Zesty
2. 0.7.9-68-gef18b8ac-0ubuntu1
3. cloud-init with network configuration rendering to netplan config has exclusive control over networkd configuration
4. On images with existing netplan configuration (UC16 has an /etc/netplan/00-snapd-config.yaml); netplan generator will parse and write out networkd config to /run/systemd/network/10-netplan-*
These files may collide with network-configuration provided to cloud-init which has been configured to render netplan.

cloud-init should employ a 'maybe-delete' like function in the netplan renderer to

a) remove /etc/netplan/00-snapd-config.yaml # this is the only known content at this time
b) remove /run/systemd/network/10-netplan* # files generated from (a)
c) remove /run/systemd/generator/netplan.stamp # prevents new invocations of netplan generate

Once these are removed, cloud-init netplan renderer may write out netplan config, and invoke netplan generate successfully.

raharper@localhost:~$ find /etc/netplan /run/systemd/network
/etc/netplan
/etc/netplan/00-snapd-config.yaml
/run/systemd/network
/run/systemd/network/10-netplan-all-en.network
/run/systemd/network/10-netplan-all-eth.network
raharper@localhost:~$ ls -al /run/systemd/generator/netplan.stamp
-rw-r--r-- 1 root root 0 Mar 23 21:58 /run/systemd/generator/netplan.stamp