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Justin Brunkow
Asked: 2019-01-22 12:59:33 +0800 CST

How do I configure DHCP bridge with netplan for KVM on Ubuntu 18.04 LTS?

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I recently installed KVM on Ubuntu 18.04 with requisite tools like virt-manager, libvirt, and qemu.

My problem is that the VMs I spin up are not connected to internet. Some give me an error message saying that my machine is not using DHCP, while other distributions just do not connect at all.

I set it up with the following article: https://linuxconfig.org/install-and-set-up-kvm-on-ubuntu-18-04-bionic-beaver-linux ...which says that I need to edit /etc/network/interfaces to create a bridge. If you read the comments on that same article, you will find that file is no longer being used and has been replaced with /etc/netplan/*

My current .yaml file in /etc/netplan looks like this:

network:
  version: 2
  renderer: NetworkManager

My network interfaces appear to be enp0s25 , wlp4s0 , and wwp0s20u4 .

How should I change my netplan configuration so that my virtual machines on KVM can have an internet connection?

virtualization kvm 18.04 netplan virt-manager

1 Answers

  1. Best Answer

    I modified the default yaml file in /etc/netplan as follows:

    network:
  version: 2
  renderer: NetworkManager
  ethernets:
    enp0s25:
      dhcp4: no
  bridges:
    br0:
      dhcp4: yes
      interfaces:
        - enp0s25
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