linux下修改主机名、ip、dns等

1、修改ip地址

即时生效:# ifconfig eth0 192.168.0.20 netmask 255.255.255.0
启动生效:修改/etc/sysconfig/network-scripts/ifcfg-eth0

2、修改default gateway

即时生效:# route add default gw 192.168.0.254
启动生效:修改/etc/sysconfig/network-scripts/ifcfg-eth0

3、修改dns

修改/etc/resolv.conf
修改后可即时生效，启动同样有效

4、修改host name

即时生效:# hostname fc2
启动生效:修改/etc/sysconfig/network