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

1.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:E8:86:37TYPE=EthernetBOOTPROTO=dhcpDEFROUTE=yesPEERDNS=yesPEERROUTES=yesIPV4_FAILURE_FATAL=noIPV6INIT=yesIPV6_AUTOCONF=yesIPV6_DEFROUTE=yesIPV6_PEERDNS=yesIPV6_PEERROUTES=yesIPV6_FAILURE_FATAL=noNAME=eno16777736UUID=79d6c916-aab8-45e4-a163-37ae73393d26ONBOOT=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 0lo: 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

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