虚拟机Centos7之联网

困扰我好久，总结下
我是用用VM虚拟机，通过NAT方式联网的

1、首先看虚拟机的网关，

2、修改文件

[root@localhost ~]# cd /etc/sysconfig/network-scripts
[root@localhost network-scripts]# vim ifcfg-ens33 

修改后的文件

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static #重要
DEFROUTE=static
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
UUID=58767061-ebf4-42ef-9f0b-c431905e206d
DEVICE=ens33
ONBOOT=yes #重要
IPV6_PRIVACY=no
IPADDR=192.168.12.1 #最后一位随便弄
NETMASK=255.255.255.0 #子网掩码
GATEWAY=192.168.12.2 #第一步的网关
DNS1=192.168.12.2 #第一步的网关                     

保存后重启

#重启
[root@localhost network-scripts]# service network restart
Restarting network (via systemctl):                        [  确定  ]
# 然后随便找个网址测试下
[root@localhost network-scripts]# ping www.baidu.com
PING www.a.shifen.com (14.215.177.39) 56(84) bytes of data.
64 bytes from 14.215.177.39 (14.215.177.39): icmp_seq=1 ttl=128 time=6.55 ms
64 bytes from 14.215.177.39 (14.215.177.39): icmp_seq=2 ttl=128 time=3.26 ms
64 bytes from 14.215.177.39 (14.215.177.39): icmp_seq=3 ttl=128 time=3.50 ms
64 bytes from 14.215.177.39 (14.215.177.39): icmp_seq=4 ttl=128 time=3.17 ms
64 bytes from 14.215.177.39 (14.215.177.39): icmp_seq=5 ttl=128 time=3.36 ms
64 bytes from 14.215.177.39 (14.215.177.39): icmp_seq=6 ttl=128 time=3.51 ms
64 bytes from 14.215.177.39 (14.215.177.39): icmp_seq=7 ttl=128 time=3.66 ms
64 bytes from 14.215.177.39 (14.215.177.39): icmp_seq=8 ttl=128 time=3.40 ms
64 bytes from 14.215.177.39 (14.215.177.39): icmp_seq=9 ttl=128 time=3.48 ms
64 bytes from 14.215.177.39 (14.215.177.39): icmp_seq=10 ttl=128 time=3.29 ms
64 bytes from 14.215.177.39 (14.215.177.39): icmp_seq=11 ttl=128 time=3.41 ms

OK，可以上网