方法1：Netplan实用程序 版本

配置前请自行备份配置文件

第一步，配置文件

root@lenovo-07:/etc/netplan# ls
01-network-manager-all.yaml

root@lenovo-07:/etc/netplan# cat 01-network-manager-all.yaml
network:
    ethernets:
        eno1:  #网卡名字
            dhcp4: no  #是否自动配置ip
            dhcp6: no  #是否自动配置ipv6
            addresses: [*.*.*.*/23]  #IP地址用,隔开  /  后面的为子网
            gateway4: *.*.*.1  #网关
            nameservers:
                addresses: [114.114.114.114,8.8.8.8]  #设置DNS服务器,能上大部分网站,且有概率提升下载速度

        # DHCP
        eno2: 
            dhcp4: true
            addresses: [] 

        # Static
        eno3: 
            addresses: [192.168.225.50/24] 
            dhcp4: no
            dhcp6: no
            gateway4: 192.168.225.1
            nameservers:
                addresses: [114.114.114.114,8.8.8.8]
    version: 2

第二步 激活配置

root@lenovo-07:/etc/netplan# sudo netplan apply

或

root@lenovo-07:/etc/netplan# sudo netplan --debug apply # 此命令可查看配置生效情况，可根据提示进行修改调整

方法2：配置文件版本 （/etc/network/interfaces）

第一步 修改配置文件

root@lenovo-07:/etc/network# cat interfaces
# DHCP
auto eno1 # 网卡名称
iface eno1 inet dhcp # 设置DHCP

# Static
auto eno2
iface eno2 inet static # 静态ip,不采用DHCP动态分配
address 192.168.90.142 # 配置ip
netmask 255.255.255.0 # 子网掩码
gateway 192.168.90.2  # 网关
dns-nameservers 10.0.208.1 #设置dns服务器地址

第二步 激活配置

root@lenovo-07:/etc/netplan# sudo /etc/init.d/networking restart

或者

#刷新网络接口
root@lenovo-07:/etc/netplan# sudo ip addr flush eno1
#重启网络服务
root@lenovo-07:/etc/netplan# sudo systemctl restart networking.service

查看当前激活的DNS

root@lenovo-07:/etc# cat resolv.conf
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# This is a dynamic resolv.conf file for connecting local clients directly to
# all known uplink DNS servers. This file lists all configured search domains.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.

nameserver 211.137.191.26
nameserver 223.5.5.5