CentOS Modify NIC Name

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A Problem description

A small problem occurs in the test environment because the virtual machines are frequently duplicated to replicate, resulting in inconsistent behavior of the NIC configuration.

Configuration file Information:

[Email protected] network-scripts]# Catifcfg-eth0

Device= "Eth0"

Nm_controlled= "Yes"

Onboot=yes

Type=ethernet

Bootproto=none

ipaddr=192.168.1.12

Prefix=24

gateway=192.168.1.1

Defroute=yes

Ipv4_failure_fatal=no

Ipv6init=no

Name= "System eth0"

Uuid=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03

Hwaddr=08:00:27:bd:a6:ed

[Email protected] network-scripts]# catifcfg-eth1

Device= "Eth1"

Nm_controlled= "Yes"

Onboot=yes

Type=ethernet

Bootproto=none

ipaddr=192.168.1.13

Prefix=24

gateway=192.168.1.1

dns1=8.8.8.8

Defroute=yes

Ipv4_failure_fatal=yes

Ipv6init=no

Name= "System eth1"

Uuid=9c92fad9-6ecb-3e6c-eb4d-8a47c6f50c04

Hwaddr=08:00:27:6e:86:10

This corresponds to the NIC name is eth0 and eth1.

But if we use the Ifconfig command to view:

[Email protected] network-scripts]# ifconfig-a

Eth2 Link encap:ethernet hwaddr08:00:27:bd:a6:ed

inet addr:192.168.1.12 bcast:192.168.1.255 mask:255.255.255.0

Inet6 ADDR:FE80::A00:27FF:FEBD:A6ED/64 Scope:link

Up broadcast RUNNING multicast mtu:1500 metric:1

RX packets:187 errors:0 dropped:0 overruns:0 frame:0

TX packets:59 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:16356 (15.9 KiB) txbytes:6116 (5.9 KiB)

Eth3 Link encap:ethernet Hwaddr08:00:27:6e:86:10

inet addr:192.168.1.13 bcast:192.168.1.255 mask:255.255.255.0

Inet6 ADDR:FE80::A00:27FF:FE6E:8610/64 Scope:link

Up broadcast RUNNING multicast mtu:1500 metric:1

RX packets:1357 errors:0 dropped:0 overruns:0 frame:0

TX packets:1099 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:120604 (117.7 KiB) txbytes:115937 (113.2 KiB)

Lo Link encap:local Loopback

inet addr:127.0.0.1 mask:255.0.0.0

Inet6 addr::: 1/128 scope:host

Up LOOPBACK RUNNING mtu:16436 metric:1

RX packets:8 errors:0 dropped:0 overruns:0 frame:0

TX packets:8 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:480 (480.0 b) txbytes:480 (480.0 b)

The NIC names here are eth2 and eth3.

Two Workaround

Modify the mapping relationship in the/etc/udev/rules.d/70-persistent-net.rules file.

--Before modification:

[Email protected] network-scripts]# Cat/etc/udev/rules.d/70-persistent-net.rules

# This file was automatically generated Bythe/lib/udev/write_net_rules

# program, run by thepersistent-net-generator.rules rules file.

#

# can modify it, as long as you keepeach rule on a single

# line, and change is only the value of Thename= key.

# PCI Device 0x8086:0x100e (e1000)

subsystem== "NET", action== "Add", drivers== "? *", attr{address}== "08:00:27:d4:ab:67", attr{type}== "1", kernel== "eth*" , name= "Eth1"

# PCI Device 0x8086:0x100e (e1000)

subsystem== "NET", action== "Add", drivers== "? *", attr{address}== "08:00:27:af:2b:37", attr{type}== "1", kernel== "eth*" , name= "Eth0"

# PCI Device 0x8086:0x100e (e1000)

subsystem== "NET", action== "Add", drivers== "? *", attr{address}== "08:00:27:bd:a6:ed", attr{dev_id}== "0x0", Attr{type} = = "1", kernel== "eth*", name= "eth2"

# PCI Device 0x8086:0x100e (e1000)

subsystem== "NET", action== "Add", drivers== "? *", attr{address}== "08:00:27:6e:86:10", attr{dev_id}== "0x0", Attr{type} = = "1", kernel== "eth*", name= "Eth3"

--After modification:

[Email protected] network-scripts]# Cat/etc/udev/rules.d/70-persistent-net.rules

# This file was automatically generated Bythe/lib/udev/write_net_rules

# program, run by thepersistent-net-generator.rules rules file.

#

# can modify it, as long as you keepeach rule on a single

# line, and change is only the value of Thename= key.

# PCI Device 0x8086:0x100e (e1000)

subsystem== "NET", action== "Add", drivers== "? *", attr{address}== "08:00:27:6e:86:10", attr{type}== "1", kernel== "eth*" , name= "Eth1"

# PCI Device 0x8086:0x100e (e1000)

subsystem== "NET", action== "Add", drivers== "? *", attr{address}== "08:00:27:bd:a6:ed", attr{type}== "1", kernel== "eth*" , name= "Eth0"

Note that the MAC address here should be consistent with the ifcfg-eth0.

Then reboot the NIC and Udev:

--ifdown Network card:

Ifdown eth0

Ifdown eth1

--Restart Udev

/etc/init.d/udev-post stop;

/etc/init.d/udev-post start

or use:

Service Udev-post Stop
Service Udev-post Start

NOTE: For Oracle Linux is udev-post, while Redhat is Udev

--ifup:

Ifup eth0

Ifup eth1

But in my test, none of the 2 have worked, and I restarted the entire OS before it came into effect. A little knowledge, a note of essays.

CentOS Modify NIC Name