Glad that helped. I'm confused as to why cloud-init doesn't add the mac
addresses - it does in my VMs. Let's ask them; I'll add them to the bug.


** Description changed:

+ == cloud-init query ==
+ 
+ Cloud-init isn't adding MAC addresses in the match stanza for various
+ network interfaces in /etc/netplan/50-cloud-init.yaml, which is leading
+ to unexpected results. Is there any reason this would happen?
+ 
+ 
+ == Original Description ==
+ 
  Running nplan 0.30 on Ubuntu 17.10. From what I can tell, the
  ethernets/interface/mtu field isn't applied when testing against a
  private ethernet adapter.
  
  Using a netplan yaml file (/etc/netplan/10-ens7.yaml):
  
  ---
  
  network:
-   version: 2
-   renderer: networkd
-   ethernets:
-     ens7:
-       mtu: 1450
-       dhcp4: no
-       addresses: [10.99.0.13/16]
+   version: 2
+   renderer: networkd
+   ethernets:
+     ens7:
+       mtu: 1450
+       dhcp4: no
+       addresses: [10.99.0.13/16]
  
  ---
  
  Then running "netplan apply" (or rebooting), yields the following:
  
  ---
  
  6: ens7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP 
group default qlen 1000
-     link/ether 52:54:00:2a:19:bc brd ff:ff:ff:ff:ff:ff
-     inet 10.99.0.13/16 brd 10.99.255.255 scope global ens7
-        valid_lft forever preferred_lft forever
-     inet6 fe80::5054:ff:fe2a:19bc/64 scope link
-        valid_lft forever preferred_lft forever
+     link/ether 52:54:00:2a:19:bc brd ff:ff:ff:ff:ff:ff
+     inet 10.99.0.13/16 brd 10.99.255.255 scope global ens7
+        valid_lft forever preferred_lft forever
+     inet6 fe80::5054:ff:fe2a:19bc/64 scope link
+        valid_lft forever preferred_lft forever
  
  ---
  
  Is this a bug in netplan, or am I misunderstanding the YAML syntax?
  
  Best,
  Andrew

** Also affects: cloud-init
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1724895

Title:
  MTU not applied on private ethernet interfaces

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