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[James Falcon <2015494@xxxxxxxxxxxxxxxxxx>]

Tracked in Github Issues as https://github.com/canonical/cloud-
init/issues/4097

** Bug watch added: github.com/canonical/cloud-init/issues #4097
   https://github.com/canonical/cloud-init/issues/4097

** Changed in: cloud-init
       Status: Triaged => Expired

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https://bugs.launchpad.net/bugs/2015494

Title:
  network-manager renderer not properly configuring /etc/resolv.conf

Status in cloud-init:
  Expired

Bug description:
  I'm running cloud-init 23.1.1 on a rockylinux 9 virtual machine
  (running on Proxmox VE) with network-manager renderer.

  The cloud-init network-config file is:

  version: 1
  config:
      - type: physical
        name: eth0
        mac_address: '62:04:02:7b:34:a0'
        subnets:
        - type: static
          address: '172.18.7.1'
          netmask: '255.255.254.0'
          gateway: '172.18.7.254'
      - type: nameserver
        address:
        - '192.84.134.50'
        - '192.84.134.55'
        search:
        - 'na.infn.it'

  Inside the VM base image I have, in /etc/cloud/cloud.cfg:

  system_info:
     network:
        renderers: ['network-manager']
        activators: ['network-manager']

  When I start the VM, everything works fine and the renderer creates
  the correct NIC config file: /etc/NetworkManager/system-
  connections/cloud-init-eth0.nmconnection:

  # Generated by cloud-init. Changes will be lost.

  [connection]
  id=cloud-init eth0
  uuid=1dd9a779-d327-56e1-8454-c65e2556c12c
  type=ethernet

  [user]
  org.freedesktop.NetworkManager.origin=cloud-init

  [ethernet]
  mac-address=62:04:02:7B:34:A0

  [ipv4]
  method=manual
  may-fail=false
  address1=172.18.7.1/23
  gateway=172.18.7.254


  
  The problem is that /etc/resolv.conf is not correctly configured with my DNS servers:

  # cat /etc/resolv.conf

  # Generated by NetworkManager
  search na.infn.it


  
  Digging into /usr/lib/python3.9/site-packages/cloudinit/net/network_manager.py it seems to me that networ-manager renderer only adds DNS servers if specified in NIC configuration (i.e. in a "subnets" section of the yaml network-config file).
  Those specified under "type: nameserver" get ignored.

  Not sure if this is a bug or it's the expected behavior.
  Could you please clarify ?

  Thanks

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