我们在VMware或VirtualBox中启动CentOS7的虚拟机，登录后，查看网卡的IP4地址，发现ens33的IP地址并未显示出来。
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| ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:d5:43:ca brd ff:ff:ff:ff:ff:ff
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这时，需要执行ifup ens33命令，让网卡连接起来。
连接好以后，再次查看IP地址。
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| ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:d5:43:ca brd ff:ff:ff:ff:ff:ff
inet 172.16.64.233/24 brd 172.16.64.255 scope global noprefixroute dynamic ens33
valid_lft 1778sec preferred_lft 1778sec
inet6 fe80::e8ec:c304:253f:44b7/64 scope link noprefixroute
valid_lft forever preferred_lft forever
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发现已经有IP地址了。
如果想让重启后配置也能生效，还需要修改/etc/sysconfig/network-scripts/ifcfg-ens33网卡配置。
把ONBOOT=no改为ONBOOT=yes
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| sed -i s/ONBOOT=no/ONBOOT=yes/g /etc/sysconfig/network-scripts/ifcfg-ens33
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