1.查看os版本

[root@oracle network-scripts]# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)

2.查看链接的是哪个网口，很多时候服务器上不只一个网口，本例就有4个，需要判断出目前网线插上的是哪个网口，本例是em1处于链接状态，那么配置ip的时候就配置这个em1

[root@oracle network-scripts]# nmcli dev status
DEVICE TYPE STATE CONNECTION
em2 ethernet unavailable --
p1p1 ethernet unavailable --
p1p2 ethernet unavailable --
em1 ethernet connected --
lo loopback unmanaged --

3.修改文件，红色是添加和修改的，BOOTPROTO=dhcp，从dhcp以后从改为static,

NM_CONTROLLED=no 表示该口将通过该配置文件进行设置，
ONBOOT=yes的意思是这个网卡开机自动启动。

vi /etc/sysconfig/network-scripts/ifcfg-em1

TYPE=Ethernet
BOOTPROTO=static
IPADDR=172.24.80.236
NETMASK=255.255.255.0
GATEWAY=172.24.80.1
NM_CONTROLLED=no
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=em1
UUID=67ac8318-e715-4081-9ef7-781140c62cb1
DEVICE=em1
ONBOOT=yes

4.重启服务

systemctl restart network.service

5.验证接口是否配置正确

[root@oracle network-scripts]# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
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: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether d0:94:66:3e:ae:d0 brd ff:ff:ff:ff:ff:ff
inet 172.24.80.236/24 brd 172.24.80.255 scope global em1
valid_lft forever preferred_lft forever
inet6 fe80::d294:66ff:fe3e:aed0/64 scope link
valid_lft forever preferred_lft forever
3: em2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
link/ether d0:94:66:3e:ae:d1 brd ff:ff:ff:ff:ff:ff
4: p1p1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
link/ether d0:94:66:3e:bf:03 brd ff:ff:ff:ff:ff:ff
5: p1p2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
link/ether d0:94:66:3e:bf:04 brd ff:ff:ff:ff:ff:ff

6.查看网口状态

[root@oracle network-scripts]# nmcli dev status
DEVICE TYPE STATE CONNECTION
em2 ethernet unavailable --
p1p1 ethernet unavailable --
p1p2 ethernet unavailable --
em1 ethernet unmanaged --
lo loopback unmanaged --

7.nmtui是使用网络管理器管理网口的命令

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