Modify host name and IP settings in Linux

After a long time learning about the Linux system, you may encounter a Linux system problem. Here we will introduce how to solve the Linux system problem and configure the network.

1. Modify the host name/etc/sysconfig/network (file)

 
 

  
  
NETWORKING=Yes 
  
  
NETWORKING_IPV6=No 
  
  
NETWORKING_IPV4=Yes 
  
  
HOSTNAME=Localhost. Localdomain/* Host Name definition, change localhost to your corresponding host name, such as bea */
  
  
DOMAINNAME=Localdomain 
  
  
GATEWAY=192. 168.0.1
 
 

In Linux, the/etc/hosts file defines the relationship between the ip address and the host name.) 127.0.0.1 localhost. localdomain localhost/* Change localhost to your host name. For Linux systems such as bea */host name, the file is changed to 127.0.0.1 bea after restart. localdomain bea

2. IP settings

Run the following command to temporarily modify the Linux system: ifconfig eth0 x. x. x. x netmask x. x. x. x does not change if the service is not restarted after the ip address is changed.

The command to restart the network service is:

 
 

  
  
Service network restart or/etc/init. d/network restart
  
  
# Sometimes you may need to use the following command
  
  
# Disabling network devices
  
  
Ifconfig eth0 down
  
  
# Enable network devices
  
  
Ifconfig eth0 up
 
 

If you want to change the ip address permanently in Linux, you can solve the problem in either of the following two ways. <A> enter a command to configure the ip address. The command is setup <B> or edit the file directly.

 
 

  
  
/Etc/sysconfig/network-scripts/ifcfg-ethX Redhat and Fedora)
  
  
/Etc/sysconfig/network/ifcfg-ethX SuSE)
  
  
/Etc/network/interfaces Debian and Ubuntu)
 
 

The content of the Linux system file is as follows:

 
 

  
  
A. static IP Address:
  
  
DEVICE=Eth0 
  
  
BOOTPROTO=Static 
  
  
ONBOOT=Yes 
  
  
TYPE=Ethernet 
  
  
NETMASK=255. 255.255.0
  
  
IPADDR=192. 168.0.1
  
  
GATEWAY=192. 168.0.1
  
  
BROADCAST=192. 168.0.255
  
  
 
 
 

 
 

  
  
b.DHCP:  
  
  
DEVICE=eth0 
  
  
BOOTPROTO=dhcp 
  
  
ONBOOT=yes 
 
 

1. Linux has successfully fixed many bugs.
2. Linux system management has won various honors
3. Ubuntu Linux systems can be used without any knowledge
4. More stable and secure Linux systems
5. High-performance servers and monitoring required for Linux System Administrators