rehat7配置虚拟机上外网（互联网）和yum源

配置虚拟机上外网（互联网）和yum源
1.在虚拟机设置中将仅主机模式改为NAT模式。

2. 进redhat修改主机网卡配置，为dhcp，并重启网络。
   cd /etc/sysconfig/network-scripts/
   [root@client network-scripts]# vim ifcfg-eno16777728
   TYPE=Ethernet
   BOOTPROTO=dhcp
   NAME=eno16777728
   ONBOOT=yes
   #DNS1=192.168.10.1
   i#IPADDR0=192.168.10.20
   PREFIX0=24
   #GATEWAY0=192.168.10.1
   DEFROUTE=yes
   PEERDNS=yes
   PEERROUTES=yes
   IPV4_FAILURE_FATAL=no
   IPV6INIT=no
   UUID=8cedbaed-b1ed-aa77-7f3c-6b5a960f4bb5
   ~
   [root@client network-scripts]# service network restart
   Restarting network (via systemctl): [ OK ]
   [root@client network-scripts]# ifconfg -a
   bash: ifconfg: command not found...
   [root@client network-scripts]# ifconfig -a
   eno16777728: flags=4163 mtu 1500
   inet 192.168.172.130 netmask 255.255.255.0
3. 外网配置成功。
   root@client network-scripts]# ping www.baidu.com
   PING www.a.shifen.com (36.155.132.76) 56(84) bytes of data.
4. bytes from 36.155.132.76: icmp_seq=1 ttl=128 time=12.7 ms
5. 配置互联网yum源
   [root@client network-scripts]# cd /etc/yum.repos.d/
   [root@client yum.repos.d]# vi base.repo
   [base]
   name= yum repo
   baseurl=http://mirrors.aliyun.com/centos/7/os/$basearch/
   enabled=1
   gpgcheck=0
   [root@client yum.repos.d]# yum list|wc -l
   11304
   配置完成。