How to set and modify CentOS system details

In the use of CentOS system, we may feel that some settings are not suitable for themselves, although not cause a lot of mistakes, but it does bring us a lot of small trouble, I would like to give you some suggestions, modify your DNS, gateway and IP address. Then let's explain how to modify it!

1, CentOS system to modify DNS

To modify the DNS profile of the corresponding network adapter

# vi/etc/resolv.conf

Modify the following content

NameServer 8.8.8.8 #google域名服务器

NameServer 8.8.4.4 #google域名服务器

2. CentOS System Modification Gateway

Modify the configuration file for the gateway that corresponds to the network card [root@centos]# vi/etc/sysconfig/network

Modify the following content

Networking=yes (Indicates whether the system is using the network, typically set to Yes.) If set to no, the network cannot be used, and many system services programs will not start.

Hostname=centos (sets the host name for this machine, where the host name is set to correspond to the hostname set in/etc/hosts)

gateway=192.168.1.1 (Sets the IP address of the gateway for this computer connection.) For example, the gateway is 10.0.0.2)

3, CentOS system modification IP Address

Modify the configuration file for the IP address of the corresponding network card

# Vi/etc/sysconfig/network-scripts/ifcfg-eth0

Modify the following content

Device=eth0 #描述网卡对应的设备别名, for example, Ifcfg-eth0 in a file that is eth0

Bootproto=static #设置网卡获得ip地址的方式, possible options for STATIC,DHCP or BOOTP, respectively corresponding to statically specified IP address, IP address obtained through DHCP protocol, IP address obtained through BOOTP protocol

broadcast=192.168.0.255 #对应的子网广播地址

HWADDR=00:07:E9:05:E8:B4 #对应的网卡物理地址

ipaddr=12.168.1.2 #如果设置网卡获得 IP address is statically specified, this field specifies the IP address of the network adapter

Ipv6init=no

Ipv6_autoconf=no

netmask=255.255.255.0 #网卡对应的网络掩码

network=192.168.1.0 #网卡对应的网络地址

Onboot=yes #系统启动时是否设置此网络接口, when set to Yes, this device is activated when the system starts

4. Restart Network configuration

Service network restart or/etc/init.d/network restart

Modify IP Address

Immediate effect:

Ifconfig eth0 192.168.0.2 netmask 255.255.255.0

Start in effect:

Modify/etc/sysconfig/network-scripts/ifcfg-eth0

Modify Gateway Default Gateway

Immediate effect:

Route add default GW 192.168.0.1 dev eth0

Start in effect:

Modify/etc/sysconfig/network

Modify DNS

Modify/etc/resolv.conf

Can be effective immediately after modification

Modify Host Name

Immediate effect:

Hostname CENTOS1

Start in effect:

Modify/etc/sysconfig/network

CentOS system, we have completed the DNS, gateway, IP address changes, restart the network configuration, we can see the effect.