centos系列报错

一、网络问题

1、报错：ping: www.baidu.com: Name or service not known（centos8）

（1）查看网卡配置：

• [root@CentOS8Shaowenhua network-scripts]# cat /etc/sysconfig/network-scripts/ifcfg-ens160
  TYPE=Ethernet
  PROXY_METHOD=none
  BROWSER_ONLY=no
  BOOTPROTO=static
  DEFROUTE=yes
  IPV4_FAILURE_FATAL=no
  IPV6INIT=yes
  IPV6_AUTOCONF=yes
  IPV6_DEFROUTE=yes
  IPV6_FAILURE_FATAL=no
  NAME=ens160
  UUID=db82a9d9-b72a-40a0-9a43-badbf4d17834
  DEVICE=ens160
  ONBOOT=yes
  IPADDR=192.168.27.128
  NETMASK=255.255.255.0
  GATEWAY=192.168.27.2
  DNS1=192.168.27.128
  DNS2=8.8.8.8
  DNS3=114.114.114.114
• 添加域名解析：DNS3=114.114.114.114

（2）vi /etc/resolv.conf

• Generated by NetworkManager

  nameserver 192.168.27.128
  nameserver 8.8.8.8
  nameserver 114.114.114.114

  (3)重启网卡：

  nmcli networking off

  nmcli networking on

  nmcli c reload

  

  (4)ping 连通性测试

  • [root@CentOS8Shaowenhua network-scripts]# ping -c 3 www.baidu.com
    PING www.a.shifen.com (220.181.38.149) 56(84) bytes of data.
    64 bytes from 220.181.38.149 (220.181.38.149): icmp_seq=1 ttl=128 time=57.1 ms
    64 bytes from 220.181.38.149 (220.181.38.149): icmp_seq=2 ttl=128 time=47.3 ms
    64 bytes from 220.181.38.149 (220.181.38.149): icmp_seq=3 ttl=128 time=47.5 ms

    --- www.a.shifen.com ping statistics ---
    3 packets transmitted, 3 received, 0% packet loss, time 4067ms
    rtt min/avg/max/mdev = 47.264/50.624/57.067/4.564 ms
    [root@CentOS8Shaowenhua network-scripts]#

2、