本文将介绍如何在CentOS 7系统下设置静态IP地址
在CentOS 7系统中，默认的网卡名是ens33，配置文件是：/etc/sysconfig/network-scripts/ifcfg-ens33
第一步：使用编辑器对该文件进行编辑
vim /etc/sysconfig/network-scripts/ifcfg-eth0
第二步：在该文件中添加如下内容并保存
BOOTPROTO=static =====此处原为dhcp，改为static
ONBOOT=yes =====设置开机加载此配置
IPADDR=192.168.199.254 =====设置静态IP地址
NETMASK=255.255.255.0 =====设置网络子网掩码
GATEWAY=192.168.199.1 =====设置网关
DNS1=192.168.199.1 =====设置DNS
设置完成后总体效果如下：
TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
UUID=cc2a07f2-4dac-4303-a2db-6b468551aae4
DEVICE=ens33
ONBOOT=yes
PEERDNS=yes
PEERROUTES=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPADDR=192.168.199.254
NETMASK=255.255.255.0
GATEWAY=192.168.199.1
DNS=192.168.199.1
第三步：重启网络服务
service network restart第四步：查看IP修改效果
①使用ifconfig命令
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.199.254 netmask 255.255.255.0 broadcast 192.168.199.255
inet6 fe80::3b18:474c:2cc6:ebab prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:34:75:ef txqueuelen 1000 (Ethernet)
RX packets 1117 bytes 163064 (159.2 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 641 bytes 130472 (127.4 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 1 (Local Loopback)
RX packets 8 bytes 704 (704.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 8 bytes 704 (704.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:e7:4b:fc txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
②使用ip addr命令
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
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 qlen 1000
link/ether 00:0c:29:34:75:ef brd ff:ff:ff:ff:ff:ff
inet 192.168.199.254/24 brd 192.168.199.255 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::3b18:474c:2cc6:ebab/64 scope link
valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000
link/ether 52:54:00:e7:4b:fc brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000
link/ether 52:54:00:e7:4b:fc brd ff:ff:ff:ff:ff:ff注意：如果BOOTPROTO那里不改成static且网络中有DHCP服务器的情况下，那么该网卡会通过DHCP获取到地址且静态地址同时生效。
以上内容为本人学习的笔记，如有任何错误，欢迎大神指正，在此先行谢过各位大神的帮助。
来源：CSDN
作者：VV贾大雄
链接：https://blog.csdn.net/qq_20500079/article/details/77432051