Ubuntu error WARNING: gateway4 has been deprecated, use default routes instead... Solution

/etc/netplan/50-cloud-init.yamlConfigure the static network under :

network:
  ethernets:
    eth0:
      dhcp4: false
      addresses: [192.168.1.11/24]
      optional: true
      gateway4: 192.168.1.1
      nameservers:
        addresses: [192.168.1.1]
  version: 2

After the configuration is complete, the following error occurs when applying the network configuration:

root@k8s-master-01:~# netplan apply

** (generate:234574): WARNING **: 14:21:04.809: `gateway4` has been deprecated, use default routes instead.
See the 'Default routes' section of the documentation for more details.

** (process:234572): WARNING **: 14:21:06.172: `gateway4` has been deprecated, use default routes instead.
See the 'Default routes' section of the documentation for more details.
root@k8s-master-01:~# 

The error message means that gateway4it has been deprecated, please use the default route instead. The default route is through routesconfiguration IP.

Modify the network configuration as follows:

network:
  ethernets:
    eth0:
      dhcp4: false
      addresses: [192.168.1.11/24]
      optional: true
      routes:
        - to: default
          via: 192.168.1.1
      nameservers:
        addresses: [192.168.1.1]
  version: 2

Apply network configuration:

netplan apply