network:
    version: 2
    ethernets:
       eth0:
          dhcp4: no
          addresses: [192.168.0.12/24]
          nameservers:
            addresses: [8.8.8.8,8.8.4.4]
       eth1:
          dhcp4: yes

network:
    version: 2
    ethernets:
       eth1:
          dhcp4: no
          addresses: [10.0.0.10/24]
          addresses: [10.0.0.20/24]
          addresses: [10.0.0.30/24]
          nameservers:
            addresses: [8.8.8.8,8.8.4.4]