关于centos:CentOS配置多个IP

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进入网卡配置目录

cd /etc/sysconfig/network-scripts

[root@www network-scripts]# ls
ifcfg-em1  ifcfg-lo ..

运行 ifconfig 查看以后应用的网卡配置

[root@www network-scripts]# ifconfig 
em1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
     inet 192.187.112.90  netmask 255.255.255.248  broadcast 192.187.112.95
     inet6 fe80::226:6cff:fef0:1158  prefixlen 64  scopeid 0x20<link>
     ether 00:26:6c:f0:11:58  txqueuelen 1000  (Ethernet)
     RX packets 541372  bytes 746304201 (711.7 MiB)
     RX errors 0  dropped 0  overruns 0  frame 0
     TX packets 99758  bytes 28932462 (27.5 MiB)
     TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
     device memory 0xfbde0000-fbdfffff  

em2: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
     ether 00:26:6c:f0:11:59  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
     device memory 0xfbd20000-fbd3ffff  

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 1000  (Local Loopback)
     RX packets 128  bytes 11776 (11.5 KiB)
     RX errors 0  dropped 0  overruns 0  frame 0
     TX packets 128  bytes 11776 (11.5 KiB)
     TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

如上，依据 IP 能够确认外网配置是 em1

复制一个配置文件
```
cp ifcfg-em1 ifcfg-em1:1
```

批改几项配置

# Generated by dracut initrd
NAME="em1"
DEVICE="em1:1"   # 前面加:1
ONBOOT="yes"
NETBOOT="yes"
UUID="75e73492-9586-45fc-951f-3d99ab134668"
IPV6INIT="yes"
BOOTPROTO="none"
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
IPADDR="192.187.112.91"  # 改成其余 IP
PREFIX="29"
GATEWAY="192.187.112.89"
DNS1="127.0.0.1"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"

如果须要配置更多 IP，能够持续复制 ifcfg-em1 文件为 ifcfg-em1:2, 相应的批改复制后的文件, 示例：

DEVICE="em1:2"   # 前面加:2
IPADDR="192.187.112.92"  # 改成其余 IP

重启网卡使配置失效
```
systemctl restart network
```

查看是否失效

[root@www network-scripts]# ifconfig 
em1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
     inet 192.187.112.90  netmask 255.255.255.248  broadcast 192.187.112.95
     inet6 fe80::226:6cff:fef0:1158  prefixlen 64  scopeid 0x20<link>
     ether 00:26:6c:f0:11:58  txqueuelen 1000  (Ethernet)
     RX packets 542683  bytes 746406082 (711.8 MiB)
     RX errors 0  dropped 0  overruns 0  frame 0
     TX packets 100544  bytes 29029241 (27.6 MiB)
     TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
     device memory 0xfbde0000-fbdfffff  

em1:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
     inet 192.187.112.91  netmask 255.255.255.248  broadcast 192.187.112.95
     ether 00:26:6c:f0:11:58  txqueuelen 1000  (Ethernet)
     device memory 0xfbde0000-fbdfffff  

em2: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
     ether 00:26:6c:f0:11:59  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
     device memory 0xfbd20000-fbd3ffff  

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 1000  (Local Loopback)
     RX packets 128  bytes 11776 (11.5 KiB)
     RX errors 0  dropped 0  overruns 0  frame 0
     TX packets 128  bytes 11776 (11.5 KiB)
     TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

em1:1 就是新增的虚构网卡

正文完