VMコピーなどでMACアドレスを変更したい場合とか、ethXXのデバイス名がおかしくなった場合の対応。

dmesg | grep eth
udev: renamed network interface eth0 to eth7
udev: renamed network interface eth1 to eth8

名前が変わってしまっている...

[root@host01 ~]# ip a
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
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth7: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 52:54:00:c6:XX:XX brd ff:ff:ff:ff:ff:ff
3: eth8: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 52:54:00:c6:XX:XX brd ff:ff:ff:ff:ff:ff

こりゃ気持ち悪い。

まずIPアドレス設定と同じファイルに新しいMACアドレスを指定します。

/etc/sysconfig/network-scripts/ifcfg-ethX

HWADDR=52:54:00:c6:XX:XX    #ここに変更後のMACアドレスを記載

その後/etc/udev/rules.dフォルダ配下にある70-presistent-net.rulesファイルの各NICのデバイス名とMACアドレスの記載を書き換えましょう。

/etc/udev/rules.d/70-persistent-net.rules

[root@host01 ~]# vi /etc/udev/rules.d/70-persistent-net.rules
"70-persistent-net.rules" 56L, 3153C# This file was automatically generated by the /lib/udev/write_net_rules
 # program, run by the persistent-net-generator.rules rules file.
 #
 # You can modify it, as long as you keep each rule on a single
 # line, and change only the value of the NAME= key.

 # PCI device 0x1af4:0x1000 (virtio-pci)
 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="52:54:00:c6:XX:X1", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

 # PCI device 0x1af4:0x1000 (virtio-pci)
 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="52:54:00:c6:XX:X2", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

 # PCI device 0x1af4:0x1000 (virtio-pci)
 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="52:54:00:c6:XX:X3", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2"

 # PCI device 0x1af4:0x1000 (virtio-pci)
 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="52:54:00:c6:XX:X4", ATTR{type}=="1", KERNEL=="eth*", NAME="eth3"

ATTR{address}==とNAME=を変更。ethX以外の名前にしたい場合もここ。
で、ネットワーク再起動

systemctl restart network

以上。