Centos 7开启网卡自动获取IP

Centos7默认安装是没有开启配置网卡信息的，无法访问外网。

下边配置打开网络自动获取Ip地址

1.查看网卡信息

执行Ifconfig

eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::20c:29ff:fee8:8637  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:e8:86:37  txqueuelen 1000  (Ethernet)
        RX packets 1121  bytes 98968 (96.6 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 179  bytes 25233 (24.6 KiB)
        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 0  (Local Loopback)
        RX packets 900  bytes 78372 (76.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 900  bytes 78372 (76.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eno16777736代表网卡的名称，ether 00:0c:29:e8:86:37代表网卡的Mac地址
2.配置网卡开始网络连接

cd /etc/system/network-scripts/
vi ifcfg-eno16777736

HWADDR=00:0C:29:E8:86:37
TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=eno16777736
UUID=79d6c916-aab8-45e4-a163-37ae73393d26
ONBOOT=no

将ONBOOT= no改成ONBOOT=yes

3.重启网络

service network restart

4.再执行ifconfig

eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.159.128  netmask 255.255.255.0  broadcast 192.168.159.255
        inet6 fe80::20c:29ff:fee8:8637  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:e8:86:37  txqueuelen 1000  (Ethernet)
        RX packets 1699  bytes 140091 (136.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 333  bytes 42669 (41.6 KiB)
        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 0  (Local Loopback)
        RX packets 900  bytes 78372 (76.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 900  bytes 78372 (76.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

inet 192.168.159.128 代表IP地址