1. 执行命令查看ip：ip addr
2. 如果没有或取到，要查看网卡是否启动，及ip配置是否正确，请先将ONBOOT改成yes，表示开机即启动
[lobin@localhost ~]$ cat /etc/sysconfig/network-scripts/ifcfg-enp0s3
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=enp0s3
UUID=2f14951f-500c-4285-9b9f-f65f37f75f0c
DEVICE=enp0s3
ONBOOT=yes