network interface
How to change a network interface name on CentOS 7
Network Settings
[1]
Set static IP address to the server.
Replace the interface name "eno16777736" for your own environment's one.
# set hostname
[root@localhost ~]# hostnamectl set-hostname dlp.srv.world
# display devices
[root@localhost ~]# nmcli d
DEVICE TYPE STATE CONNECTION eno16777736 ethernet connected eno16777736 lo loopback unmanaged --
# set IPv4 address ⇒ nmcli *** [IP address]
[root@localhost ~]# nmcli c modify eno16777736 ipv4.addresses 10.0.0.30/24
# set default gateway
[root@localhost ~]# nmcli c modify eno16777736 ipv4.gateway 10.0.0.1
# set DNS
[root@localhost ~]# nmcli c modify eno16777736 ipv4.dns 10.0.0.1
# set manual for static setting (it's "auto" for DHCP)
[root@localhost ~]# nmcli c modify eno16777736 ipv4.method manual
# restart the interface and reload the settings
[root@localhost ~]# nmcli c down eno16777736; nmcli c up eno16777736
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/1)
# show settings
[root@localhost ~]# nmcli d show eno16777736
GENERAL.DEVICE: eno16777736 GENERAL.TYPE: ethernet GENERAL.HWADDR: 00:0C:29:CD:9C:2D GENERAL.MTU: 1500 GENERAL.STATE: 100 (connected) GENERAL.CONNECTION: eno16777736 GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/0 WIRED-PROPERTIES.CARRIER: on IP4.ADDRESS[1]: ip = 10.0.0.30/24, gw = 10.0.0.1 IP4.DNS[1]: 10.0.0.1 IP6.ADDRESS[1]: ip = fe80::20c:29ff:fecd:9c2d/64, gw = ::
# show status
[root@localhost ~]# ip addr show
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 valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:cd:9c:2d brd ff:ff:ff:ff:ff:ff inet 10.0.0.30/24 brd 10.0.0.255 scope global eno16777736 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fecd:9c2d/64 scope link valid_lft forever preferred_lft forever
[2]
Disable IPv6 if you do not need it.
[root@localhost ~]# vi /etc/default/grub
# line 6: add
GRUB_CMDLINE_LINUX="ipv6.disable=1 rd.lvm.lv=fedora-server/root.....
# apply changing
[root@localhost ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
[root@localhost ~]# reboot
[3]
If you'd like to use the network interface name as ethX, configure like follows.
[root@dlp ~]# vi /etc/default/grub
# line 6: add
GRUB_CMDLINE_LINUX="net.ifnames=0 rd.lvm.lv=fedora/swap rd.md=0.....
# apply changing
[root@dlp ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
[root@dlp ~]# reboot
[root@worldcm ~]# vi /etc/default/grub [edit line 5]
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=”$(sed ‘s, release .*$,,g’ /etc/system-release)”
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT=”console”
GRUB_CMDLINE_LINUX=”rd.lvm.lv=rootvg/usrlv rd.lvm.lv=rootvg/swaplv crashkernel=auto vconsole.keymap=us rd.lvm.lv=rootvg/rootlv vconsole.font=latarcyrheb-sun16 rhgb quiet”
GRUB_DISABLE_RECOVERY=”true”
Look for this line “GRUB_CMDLINE_LINUX” and add the following: “net.ifnames=0 biosdevname=0”
Should look like this:
GRUB_CMDLINE_LINUX=”rd.lvm.lv=rootvg/usrlv rd.lvm.lv=rootvg/swaplv crashkernel=auto vconsole.keymap=us rd.lvm.lv=rootvg/rootlv vconsole.font=latarcyrheb-sun16 rhgb quiet net.ifnames=0 biosdevname=0”
[root@worldcm ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file …
Found linux image: /boot/vmlinuz-3.10.0-121.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-121.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-df30d92ad3eb414583d85bb471003eb4
Found initrd image: /boot/initramfs-0-rescue-df30d92ad3eb414583d85bb471003eb4.img
done
If you didn’t put any names during the installation, you will need to rename the interface files by renaming the file /etc/sysconfig/network-scripts/ifcfg-*.
[root@worldcm ~]# mv /etc/sysconfig/network-scripts/ifcfg-eno16777736 /etc/sysconfig/network-scripts/ifcfg-eth0
[root@worldcm ~]# shutdown -r now
After system reboot
[root@worldcm ~]# ip addr show
1: lo: 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
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:92:78:40 brd ff:ff:ff:ff:ff:ff
inet 10.0.10.77/24 brd 10.0.10.255 scope global dynamic eth0
valid_lft 86141sec preferred_lft 86141sec
inet6 fe80::20c:29ff:fe92:7840/64 scope link
valid_lft forever preferred_lft forever
-----------------------
Network Settings2015/01/07
[1] Set static IP address to the server.
Replace the interface name "eno16777736" for your own environment's one.
# set hostname
[root@localhost ~]# hostnamectl set-hostname dlp.srv.world
# display devices
[root@localhost ~]# nmcli d
DEVICE TYPE STATE CONNECTION
eno16777736 ethernet connected eno16777736
lo loopback unmanaged --
# set IPv4 address ⇒ nmcli *** [IP address]
[root@localhost ~]# nmcli c modify eno16777736 ipv4.addresses 10.0.0.30/24
# set default gateway
[root@localhost ~]# nmcli c modify eno16777736 ipv4.gateway 10.0.0.1
# set DNS
[root@localhost ~]# nmcli c modify eno16777736 ipv4.dns 10.0.0.1
# set manual for static setting (it's "auto" for DHCP)
[root@localhost ~]# nmcli c modify eno16777736 ipv4.method manual
# restart the interface and reload the settings
[root@localhost ~]# nmcli c down eno16777736; nmcli c up eno16777736
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/1)
# show settings
[root@localhost ~]# nmcli d show eno16777736
GENERAL.DEVICE: eno16777736
GENERAL.TYPE: ethernet
GENERAL.HWADDR: 00:0C:29:CD:9C:2D
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.CONNECTION: eno16777736
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/0
WIRED-PROPERTIES.CARRIER: on
IP4.ADDRESS[1]: ip = 10.0.0.30/24, gw = 10.0.0.1
IP4.DNS[1]: 10.0.0.1
IP6.ADDRESS[1]: ip = fe80::20c:29ff:fecd:9c2d/64, gw = ::
# show status
[root@localhost ~]# ip addr show
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
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:cd:9c:2d brd ff:ff:ff:ff:ff:ff
inet 10.0.0.30/24 brd 10.0.0.255 scope global eno16777736
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fecd:9c2d/64 scope link
valid_lft forever preferred_lft forever
[2] Disable IPv6 if you do not need it.
[root@localhost ~]# vi /etc/default/grub
# line 6: add
GRUB_CMDLINE_LINUX="ipv6.disable=1 rd.lvm.lv=fedora-server/root.....
# apply changing
[root@localhost ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
[root@localhost ~]# reboot
[3] If you'd like to use the network interface name as ethX, configure like follows.
[root@dlp ~]# vi /etc/default/grub
# line 6: add
GRUB_CMDLINE_LINUX="net.ifnames=0 rd.lvm.lv=fedora/swap rd.md=0.....
# apply changing
[root@dlp ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
[root@dlp ~]# reboot