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Editor to share with you what are the differences between the centos7 network configuration and the previous version, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!

Centos7 has an automatic detection function for network card devices:

(1) Nic naming mechanism

How systemd names network devices:

(a) if the index information provided by Firmware or BIOS for devices integrated on the motherboard is available and predictable, it is named after this index, such as eno1

(B) if the index information provided by Firmware or BIOS for the PCI-E expansion slot is available and predictable, name it according to this index, such as ens1

(C) if physical location information for the hardware interface is available, name it based on this information, such as enp2s0

(d) if the user starts it explicitly, it can also be named after the MAC address, enx2387a1dc56

(e) if none of the above is available, the traditional naming mechanism is used.

Some of the above naming mechanisms require the participation of biosdevname programs.

(2) the format of name composition

En:ethernet Ethernet

Wl:wlan wireless local area network

Ww:wwan wireless wide area network

Name type:

O: the device index number of the integrated device

S: the index number of the expansion slot

X: naming based on MAC address

Ps:enp2s1

Naming process of Nic devices:

Step one:

Udev, accessibility program / lib/udev/rename_device,/usr/lib/udev/rules.d/60-net.rules

Read configuration file

Step 2:

Biosdevname will be based on / usr/lib/udev/rules.d/71-biosdevname.rules

Step 3:

By detecting the network interface device, according to / usr/lib/udev/rules.d/75-net-description

ID_NET_NAME_ONBOARD,ID_NET_NAME_SLOT,ID_NET_NAME_PATH

Return to the traditional naming method:

(1) Edit / etc/default/grub configuration file

GRUB_CMDLINE_LINUX= "net.ifnames=0rhgbquiet"

(2) generate its configuration file for grub2

Grub2-mkconfig-o/etc/grub2.cfg

(3) restart the system

Address configuration tool: nmcli:

Display network information: nmclideviceshow [deveth0]

Nmclicon {show | up | down | add | modify | edit | delete | reload | load}

How to modify attributes such as IP address:

# nmcliconnectionmodify API name [+ | -] setting.propertyvalue

Setting.property:

Ipv4.addresses

Ipv4.gateway

Ipv4.dns1

Ipv4.method

Manual

Network Interface configuration tui tool: nmtui

Host name configuration tool: hostnamectl

Status

Set-hostname

The above is all the contents of the article "what are the differences between the centos7 network configuration and the previous version". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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