CentOS7 Network Device Name 변경하기

System Story/CentOS 7 2015. 12. 8. 15:26

CentOS 7 또는 Redhat Enterprise Linux 7 버전을 처음 설치하게 되면 Network Device Name이 이전 버전과는 상이하게 표기되는 것을 확인 할 수 있다.


이는 CentOS 7 버전부터 채택된 systemd를 통해 일관되고 예측가능한 (Consistent and predictable network device naming) 네트워크 장치이름을 제공하는 방식으로 변경되었으며,


BIOS Level에서 인지하는 PCI BUS 주소에 따른 물리적인 장치순서 및 Type에 따라 이름을 지정하는 방식이다.


(참고 - https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Networking_Guide/ch-Consistent_Network_Device_Naming.html)


무튼 각설하고~


enp0s3 뭔가 이름이 굉장히 낯설고 어색하다........... -ㅅ -


그래서 "난 저 일관되고 예측가능한 방식의 장치명 보다는 예전 방식이 좋다.." 한다면 아래와 같은 과정을 통해 장치명을 변경 가능하다.



1. Ethernet 장치명 및 상태 확인


[root@centos7 ~]# 

[root@centos7 ~]# ip addr 

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: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 08:00:27:19:5c:c6 brd ff:ff:ff:ff:ff:ff

    inet 192.168.137.70/24 brd 192.168.137.255 scope global enp0s3

       valid_lft forever preferred_lft forever

    inet6 fe80::a00:27ff:fe19:5cc6/64 scope link 

       valid_lft forever preferred_lft forever

[root@centos7 ~]# 

[root@centos7 ~]# 

[root@centos7 ~]# find /sys/devices/ -type l | grep enp

/sys/devices/pci0000:00/0000:00:03.0/net/enp0s3/device

/sys/devices/pci0000:00/0000:00:03.0/net/enp0s3/subsystem

[root@centos7 ~]# 

[root@centos7 ~]# 

[root@centos7 ~]# lspci | grep -i eth

00:03.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet Controller (rev 02)

[root@centos7 ~]# 

[root@centos7 ~]# 

[root@centos7 ~]# for LIST in `ifconfig -a | grep enp | awk '{print $1}'`; do echo "${LIST} - `ethtool ${LIST} | egrep 'Speed|Link detected'`" && echo; done

enp0s3: - Speed: 1000Mb/s

Link detected: yes


[root@centos7 ~]# 

[root@centos7 ~]#  



2. Boot Loader grub에서 Kernel 부팅 옵션에 BIOS기반 장치 이름을 사용하지 않도록 Parameter 선언


[root@centos7 ~]#
[root@centos7 ~]# cat /etc/default/grub
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=centos/swap vconsole.font=latarcyrheb-sun16 rd.lvm.lv=centos/root crashkernel=auto  vconsole.keymap=us rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
[root@centos7 ~]#
[root@centos7 ~]#
[root@centos7 ~]#
[root@centos7 ~]# perl -pi -e 's#rhgb#net.ifnames=0 biosdevname=0 rhgb#g' /etc/default/grub
[root@centos7 ~]#
[root@centos7 ~]# cat /etc/default/grub | grep rhgb
GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/swap vconsole.font=latarcyrheb-sun16 rd.lvm.lv=centos/root crashkernel=auto  vconsole.keymap=us net.ifnames=0 biosdevname=0 rhgb quiet"
[root@centos7 ~]#
[root@centos7 ~]#
[root@centos7 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-123.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-123.el7.x86_64.img
Warning: Please don't use old title `CentOS Linux, with Linux 3.10.0-123.el7.x86_64' for GRUB_DEFAULT, use `Advanced options for CentOS Linux>CentOS Linux, with Linux 3.10.0-123.el7.x86_64' (for versions before 2.00) or `gnulinux-advanced-b25b1e98-c089-4c51-902f-678c478175da>gnulinux-3.10.0-123.el7.x86_64-advanced-b25b1e98-c089-4c51-902f-678c478175da' (for 2.00 or later)
Found linux image: /boot/vmlinuz-0-rescue-80837d5f83094e51a40be051fdbc03e3
Found initrd image: /boot/initramfs-0-rescue-80837d5f83094e51a40be051fdbc03e3.img
done
[root@centos7 ~]#
[root@centos7 ~]#


 

3. ifcfg 설정에 정의된 네트워크 장치명 변경

 

[root@centos7 ~]#
[root@centos7 ~]# cd /etc/sysconfig/network-scripts/
[root@centos7 network-scripts]#
[root@centos7 network-scripts]#
[root@centos7 network-scripts]# mv ifcfg-enp0s3 ifcfg-eth0
[root@centos7 network-scripts]#
[root@centos7 network-scripts]# cat ifcfg-eth0
TYPE=Ethernet
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
NAME=enp0s3
UUID=567cbcc2-dd0c-4ea0-af1c-2057b4c4467a
ONBOOT=yes
HWADDR=08:00:27:19:5C:C6
IPADDR=192.168.137.70
NETMASK=255.255.255.0
GATEWAY=192.168.137.1
DNS1=147.6.44.44
[root@centos7 network-scripts]#
[root@centos7 network-scripts]# perl -pi -e 's#NAME=enp0s3#NAME=eth0#g' ifcfg-eth0
[root@centos7 network-scripts]#
[root@centos7 network-scripts]# cat ifcfg-eth0 | grep NAME
NAME=eth0
[root@centos7 network-scripts]#
[root@centos7 network-scripts]#
[root@centos7 network-scripts]#


 

4. Network 서비스 재기동 및 변경된 Network Device Name 확인

 

[root@centos7 network-scripts]#
[root@centos7 network-scripts]# systemctl list-unit-files | grep -i network
dbus-org.freedesktop.NetworkManager.service enabled
NetworkManager-dispatcher.service           enabled
NetworkManager-wait-online.service          disabled
NetworkManager.service                      enabled
network-online.target                       static 
network.target                              static 
[root@centos7 network-scripts]#
[root@centos7 network-scripts]#
[root@centos7 network-scripts]#
[root@centos7 network-scripts]#
[root@centos7 network-scripts]# systemctl restart NetworkManager.service
[root@centos7 network-scripts]#
[root@centos7 network-scripts]# service network restart
Restarting network (via systemctl):                        [  OK  ]
[root@centos7 network-scripts]#
[root@centos7 network-scripts]#
[root@centos7 ~]#
[root@centos7 ~]#
[root@centos7 ~]# ip addr | grep -w "inet"
    inet 127.0.0.1/8 scope host lo
    inet 192.168.137.70/24 brd 192.168.137.255 scope global eth0
[root@centos7 ~]#
[root@centos7 ~]#

 

 

 

 

 

 

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