CentOS / RHEL 7 : How to modify Network Interface names

On CentOS / RHEL 7, a new naming scheme is introduced. For instance:

# ip addr show
      .....
      eno1: [BROADCAST,MULTICAST,UP,LOWER_UP] mtu 1500 qdisc pfifo_fast state UP qlen 1000
      link/ether 6c:0b:84:6c:48:1c brd ff:ff:ff:ff:ff:ff
      inet 10.10.10.11/24 brd 10.10.10.255 scope global eno1
      inet6 2606:b400:c00:48:6e0b:84ff:fe6c:481c/128 scope global dynamic
      valid_lft 2326384sec preferred_lft 339184sec
      inet6 fe80::6e0b:84ff:fe6c:481c/64 scope link
      valid_lft forever preferred_lft forever
      

This post describes how to revert to legacy naming scheme with Network Interface names as eth0, eth1, etc.

1. Edit kernel boot parameter.

Edit file /etc/default/grub and add net.ifnames=0 biosdevname=0 to line GRUB_CMDLINE_LINUX, for instance:

GRUB_CMDLINE_LINUX=" crashkernel=auto net.ifnames=0 biosdevname=0 rhgb quiet"

Regenerate a GRUB configuration file and overwrite existing one:

# grub2-mkconfig -o /boot/grub2/grub.cfg
2. Correct ifcfg file configuration:

Edit NAME and DEVICE parameters in ifcfg file to new Network Interface name.

# cat /etc/sysconfig/network-scripts/ifcfg-eno1
      ......
      NAME=eth0
      DEVICE=eth0
      ......

Edit ifcfg file name:

mv /etc/sysconfig/network-scripts/ifcfg-eno1 /etc/sysconfig/network-scripts/ifcfg-eth0
3. Disable NetworkManager
# systemctl disable NetworkManager
      rm '/etc/systemd/system/multi-user.target.wants/NetworkManager.service'
      rm '/etc/systemd/system/dbus-org.freedesktop.NetworkManager.service'
      rm '/etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service'
4. Reboot system.
# shutdown -r now
5. Verify.
# ip addr show
      .....
      eth0: [BROADCAST,MULTICAST,UP,LOWER_UP] mtu 1500 qdisc pfifo_fast state UP qlen 1000
      link/ether 6c:0b:84:6c:48:1c brd ff:ff:ff:ff:ff:ff
      inet 10.10.10.11/24 brd 10.10.10.255 scope global eno1
      inet6 2606:b400:c00:48:6e0b:84ff:fe6c:481c/128 scope global dynamic
      valid_lft 2326384sec preferred_lft 339184sec
      inet6 fe80::6e0b:84ff:fe6c:481c/64 scope link
      valid_lft forever preferred_lft forever


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