How to configure multiple IPs for Linux Centos 71 NICs

Because the author recently encountered such a situation, the number of servers to do networking planning, the client side gives a limited amount of IP,

Not enough for each host to be assigned to IP, but I think again, not necessarily every service must use the DCN network address,

So I think I can configure the network card that must use the DCN network address two IP, a DCN network address, a private IP address we define ourselves

The author takes the operating system under VMware Virtual machine: Centos 7 As an example, the specific configuration process is as follows:

"Method One: Add multiple ips through the configuration file of the network card"

1, edit eno16777736 network card configuration file/etc/sysconfig/network-scripts/ifcfg-eno16777736, add in the format as follows

 type=ethernetbootproto  =nonename  =eno16777736device  =eno16777736onboot  =yesipaddr0  =137.66  prefix0  =27  gateway0  =10.91 . 137.65   #################### #IPADDR1  =192.168  . 100.2   PREFIX1  =24  Span style= "color: #008000;" >//  

2, the use of systemctl restart Network.service command restart the Network service after the effective, view network card information, as shown in

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"Method Two: Add by IP alias of network card"

In a Linux system, we can configure multiple IP addresses on a physical network card to implement sub-interface-like functions, which we call IP aliases.

IP aliases allow us to configure multiple IP addresses on a physical network card. The implementation process is as follows:

1, such as eno16777736 network card configuration file ifcfg-eno16777736 content as follows, here we also only set up an IP

Type=Ethernetbootproto=nonename=Eno16777736device=eno16777736onboot=  Yesipaddr=10.91. 137.66 NETMASK=255.255. 255.0 GATEWAY=10.91. 137.65

2, Next we create the NIC alias file/etc/sysconfig/network-scripts/ifcfg-eno16777736:0 file , add the following content

Type=Ethernetbootproto=nonename=eno16777736:0DEVICE=eno16777736:0 onboot=yesipaddr=192.168. 100.3 NETMASK=255.255. 255.0          #这里也可以写成PREFIX =

3, finally we use systemctl restart Network.service command to restart the Network service after the effective, and then view the network card information, the results are as follows:

[[Email protected]5201351~]# IP addr Show eno167777362: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> MTU theQdisc Pfifo_fast State up Qlen +Link/etherxx: 0c: in: 5b:b2: ,BRD ff:ff:ff:ff:ff:ff inet10.91.137.66/ -Brd10.91.137.95scope Global eno16777736 Valid_lft forever Preferred_lft Forever inet192.168.100.3/ -Brd192.168.100.255Scope Global eno16777736:0Valid_lft Forever Preferred_lft forever Inet6 fe80::20c:29ff:fe5b:b208/ -scope link Valid_lft forever Preferred_lft forever

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How to configure multiple IPs for Linux Centos 71 NICs