ubuntu 18.04 使用固定ip

csq@ubuntu_server_001:/etc/netplan$ cat 50-cloud-init.yaml
# This file is generated from information provided by
# the datasource.  Changes to it will not persist across an instance.
# To disable cloud-init‘s network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        enp0s3:
            addresses: [192.168.1.81/24,]
            gateway4: 192.168.1.1
            dhcp4: no
    version: 2