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This article will explain in detail how the configuration options of the files related to network configuration in CentOS are described. The content of the article is of high quality, so the editor will share it with you for reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

CentOS modifies network-related configuration files such as IP addresses

Find the IP address profile of the corresponding network card: ifcfg-eth number.

Path: / etc/sysconfig/network-scripts/ifcfg-eth digit

Description of configuration items in the file

The code is as follows:

DEVICE=eth0 # describes the device alias corresponding to the Nic, for example, it is eth0 in the file of ifcfg-eth0

BOOTPROTO=static # sets how the network card obtains the ip address. The options are: static (static), dhcp (to obtain IP through DHCP) or bootp (to obtain IP using BOOTP protocol)

BROADCAST=192.168.0.255 # Subnet broadcast address

HWADDR=00:17:F3:05:18:20 # Network Card physical address (MAC)

Use this IP address when IPADDR=192.168.0.2 # BOOTPROTO=static

IPV6INIT=no # initialization of IPv6 function

Whether IPV6_AUTOCONF=no # automatically configures IPv6

The network mask for the NETMASK=255.255.255.0 # Nic

NETWORK=192.168.1.0 # Network address corresponding to the Nic

ONBOOT=yes # whether this device is enabled when the system starts, or activated when the system starts up when yes

# TYPE=Ethernet # Network Type

# USERCTL=no # whether non-root users can control the device

Update on March 18, 2014: do not set the parameter NETWORK in CentOS, it has been officially deprecated, and the gateway may not be added successfully after setting it. Please see the latest blog post: problems caused by setting NETWORK in CentOS network configuration.

CentOS official help: http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-networkscripts-interfaces.html

Configuration files related to CentOS gateway configuration

Path: / etc/sysconfig/network

Description of configuration items in the file

The code is as follows:

NETWORKING=yes # indicates whether the system uses a network, usually yes. If no, the network is not used and many system services cannot be started

# NETWORKING_IPV6=no # whether to enable IPv6

# FORWARD_IPV4=no # whether to enable IP forwarding

# HOSTNAME=localhost.localdomain # set the hostname of this machine. The value should correspond to the hostname set in / etc/hosts. When commented out, the hostname or domain name is generally resolved first, and then the DNS is resolved.

GATEWAY=192.168.1.1 # set the IP address of the gateway

# GATEWAYDEV=gateway # Gateway device name

CentOS official help: http://www.centos.org/docs/5/html/5.2/Deployment_Guide/s2-sysconfig-network.html

CentOS DNS-related configuration files

Path: / etc/resolv.conf

Description of configuration items in the file

The code is as follows:

# the most important thing is nameserver, others can be ignored

Nameserver 8.8.8.8 # google Domain name Server

Nameserver 8.8.4.4 # google Domain name Server

# search mitchellchu.com www.mitchellchu.com # define the search list of domain names

# domain mitchellchu.com # define a local domain name

# sortlist # sort the returned domain names

Network device restart

Service network restart

Or

/ etc/init.d/network restart

IP address modification

Effective immediately:

Ifconfig eth0 192.168.0.2 netmask 255.255.255.0

Take effect after restarting the network device

See modification of / etc/sysconfig/network-scripts/ifcfg-eth number

Modify the current gateway Default Gateway

Effective immediately:

Route add default gw 192.168.0.1 dev eth0

Effective after restarting the network device:

See: / etc/sysconfig/network configuration

Modify DNS

See: / etc/resolv.conf configuration

Effective immediately after modification

Modify hostname

Effective immediately:

Hostname centos1

Restart takes effect:

See: / etc/sysconfig/network configuration, note that there is also the configuration of / etc/hosts

On the CentOS network configuration-related file configuration options description is shared here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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