How to configure Linux KVM bridge on Ubuntu 18.04 & 20.04 LTS ?

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1. Install all the required KVM packages:

   # apt install qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils virt-manager  -y

2. Start and enable 'libvirtd' daemon:

   # systemctl start libvirtd 
   # systemctl enable libvirtd
   # systemctl status libvirtd

3. Login to the KVM host using console or do SSH:

   ➤ ssh -l root kvmhost.example.com

   The default config file will look like below:

# cat  /etc/netplan/50-cloud-init.yaml

network:
    ethernets:
        eno1:
            addresses:
            - 192.168.0.3/24
            dhcp4: false
            gateway4: 192.168.0.1
            nameservers:
                addresses:
                - 192.168.125.100
                search:
                - example.com
        eno2:
            addresses: []
            dhcp4: true
            optional: true
        eno3:
            addresses: []
            dhcp4: true
            optional: true
        eno4:
            addresses: []
            dhcp4: true
            optional: true
    version: 2

4. Modify '/etc/netplan/50-cloud-init.yaml' file to look like below:

network:
    ethernets:
        eno1:
            dhcp4: no

     bridges:
        br0:
            interfaces: [eno1]
            addresses:
            - 192.168.0.3/24
            dhcp4: false
            gateway4: 192.168.0.1
            nameservers:
                addresses:
                - 192.168.125.100
                search:
                - example.com
        eno2:
            addresses: []
            dhcp4: true
            optional: true
        eno3:
            addresses: []
            dhcp4: true
            optional: true
        eno4:
            addresses: []
            dhcp4: true
            optional: true
    version: 2

5. Run the below command to activate the configuration and validate it:

# netplan apply
# networkctl status
●        State: routable
       Address: 192.168.122.1 on virbr0
                192.168.0.3 on br0
                fe80::fc54:ff:fe28:1024 on vnet0
                fe80::fc1a:eeff:fe89:7651 on br0
       Gateway: 192.168.0.1 (Lab Inc) on br0
           DNS: 192.168.125.100
Search Domains: example.com

To check only the bridge interface:

# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.fe1aee897651       no              eno1
eno3            8000.364b4e33de58       no
virbr0          8000.5254006b0d43       yes             virbr0-nic

# networkctl status br0
● 12: br0
       Link File: /lib/systemd/network/99-default.link
    Network File: /run/systemd/network/10-netplan-br0.network
            Type: ether
           State: routable (configured)
          Driver: bridge
      HW Address: fe:1a:ee:89:76:51
         Address: 192.168.0.3
                  fe80::fc1a:eeff:fe89:7651
         Gateway: 192.168.0.1 (Lab Inc)
             DNS: 192.168.125.100
  Search Domains: example.com

# ifconfig br0
br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.3  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::fc1a:eeff:fe89:7651  prefixlen 64  scopeid 0x20<link>
        ether fe:1a:ee:89:76:51  txqueuelen 1000  (Ethernet)
        RX packets 12905  bytes 1183745 (1.1 MB)
        RX errors 0  dropped 1885  overruns 0  frame 0
        TX packets 8750  bytes 5653021 (5.6 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


Finally the KVM bridge is ready and can be mapped to your virtual machines now.




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