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[Bug Watch Updater <2027975@xxxxxxxxxxxxxxxxxx>]

** Changed in: cloud-init
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/2027975

Title:
  Add check on network interface name's length

Status in cloud-init:
  Fix Released
Status in MAAS:
  Triaged

Bug description:
  When adding a VLAN on long network interfaces, Cloud-init will fail
  silently to add the sub-interfaces.

  Deployed environment is :
  * MAAS 3.3.4
  * Server Dell R630 + Mellanox Connectx-5
  * name of interfaces : enp130s0f0np0 / enp130s0f1np1
  * add a VLAN like 100-4093

  Cloud-Init will not display any error message but the VLAN interfaces will not be added after the deployment.
  If trying to perform the operation manually, we are then greeted with the following error message.

  ```
  ubuntu@R630:~$ sudo ip link add link enp130s0f0np0 name enp130s0f0np0.103 type vlan id 103
  Error: argument "enp130s0f0np0.103" is wrong: "name" not a valid ifname
  ```

  From Iproute2 and Kernel perspective, it is not possible to have
  interfaces with a name longer than 15 characters in total.

  A quick workaround is simply to rename the network interface to something shorter.
  Having a quick warning from MAAS would be nice to have to understand the origin of the issue.

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