netplan (ubunut network)

Ubuntu 18.04 LTS has switched to Netplan for configuring network interfaces. Netplan is based on YAML based configuration system that makes configuration process very simple. Netplan has replaced the old configuration file /etc/network/interfaces that we previously used for configuring network interfaces in Ubuntu.

/via:https://vitux.com/how-to-configure-networking-with-netplan-on-ubuntu/
/via:https://askubuntu.com/questions/962016/netplan-config-for-two-network-interfaces

generic.yaml

network:
    version: 2
    renderer: NetworkManager/ networkd
    ethernets:
       DEVICE_NAME:
          dhcp4: yes/no
          addresses: [IP_ADDRESS/NETMASK]
          gateway: GATEWAY
          nameservers:
             addresses: [NAMESERVER_1, NAMESERVER_2]
             search: [search_domain,search_domain2] 

/etc/netplan/00-installer-config.yaml

network:
    version: 2
    renderer: NetworkManager/ networkd
    ethernets:
       DEVICE_NAME:
          dhcp4: no
          addresses: 192.168.30.50/24
          gateway: 192.168.30.249
          nameservers:
             addresses: [192.168.30.10,192.168.30.249]
       DEVICE_NAME2:
	  ...

sudo netplan try

sudo netplan [-d] apply # -d : debugging

sudo systemctl restart network-manager
sudo systemctl restart system-networkd # ubuntu-server