Comment 20 for bug 2008952

I can confirm Dan's validation that After=systemd-resolved.service doesn't buy us anything here because, although systemd-resolved.service is up, NetworkManager.service && NetworkManager-wait-online.service don't finish bringing link up for related network devices until After=dbus.service timeframe. So blocking on systemd-resolved.service tells us only that the service is running, not that it provides useful DNS lookups.

Since dbus.service is After=sysinit.target and sysinit.target is After=cloud-init.service we have an ordering cycle for NetworkManager that doesn't exist for systemd-networkd controlled environments. Any attempts to include After=NetworkManager-wait-online.service in cloud-init.service definition result in ordering cycles. Even if we try to add DefaultDependecies=no to both NetworkManager.service and NetworkManager-wait-online.service to prevent them from pulling in `After=sysinit.target` for ordering.

NetworkManager images (desktop) differ from cloud-init's systemd-networkd managed images (server) because systemd-networkd-wait-online.service doesn't have a strict After=dbus.service config systemd-networkd can poll for dbus availability and use it once it's available. But, it doesn't seem NetworkManager has that facility though I haven't dug deeply into NM yet.