ubuntu20.04 域名解析暂时失败

1、前言

ping: www.baidu.com: 域名解析暂时失败

2、排查

ifconfig 显示如下，enx000ec635404a网卡没有ip配置

enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.19.138  netmask 255.255.255.0  broadcast 192.168.19.255
        inet6 fe80::d058:2b28:6be9:fe29  prefixlen 64  scopeid 0x20<link>
        ether ce:e6:4c:68:04:bc  txqueuelen 1000  (以太网)
        RX packets 276511173  bytes 348533647010 (348.5 GB)
        RX errors 0  dropped 23750  overruns 0  frame 0
        TX packets 465668303  bytes 541502143429 (541.5 GB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enx000ec635404a: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 00:0e:c6:35:40:4a  txqueuelen 1000  (以太网)
        RX packets 71039  bytes 12267317 (12.2 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 10258570  bytes 11216668369 (11.2 GB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (本地环回)
        RX packets 6466211  bytes 1905907598 (1.9 GB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 6466211  bytes 1905907598 (1.9 GB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

sudo vim /etc/netplan/00-installer-config.yaml 创建配置文件，输入以下内容

enx000ec635404a 网卡名称与上述缺少ip的网卡一致

network:
  ethernets:
    enx000ec635404a:     #配置的网卡的名称
      addresses: [192.168.0.138/24]    #配置的静态ip地址和掩码
      dhcp4: no    #关闭DHCP，如果需要打开DHCP则写yes
      optional: true
      gateway4: 192.168.0.1    #网关地址
      nameservers:
         addresses: [192.168.0.1,114.114.114.114]    #DNS服务器地址，多个DNS服务器地址需要用英文逗号分隔开
  version: 2
  renderer: networkd    #指定后端采用systemd-networkd或者Network Manager，可不填写则默认使用systemd-workd

sudo netplan apply 使网络配置生效

结果

enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.19.138  netmask 255.255.255.0  broadcast 192.168.19.255
        inet6 fe80::d058:2b28:6be9:fe29  prefixlen 64  scopeid 0x20<link>
        ether ce:e6:4c:68:04:bc  txqueuelen 1000  (以太网)
        RX packets 276511173  bytes 348533647010 (348.5 GB)
        RX errors 0  dropped 23750  overruns 0  frame 0
        TX packets 465668303  bytes 541502143429 (541.5 GB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enx000ec635404a: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.138  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::864b:38d0:a3d7:cc1d  prefixlen 64  scopeid 0x20<link>
        ether 00:0e:c6:35:40:4a  txqueuelen 1000  (以太网)
        RX packets 71039  bytes 12267317 (12.2 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 10258570  bytes 11216668369 (11.2 GB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (本地环回)
        RX packets 6466211  bytes 1905907598 (1.9 GB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 6466211  bytes 1905907598 (1.9 GB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

3、扩展

ping: www.baidu.com: 域名解析暂时失败 简单解决

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