Linux/Ubuntu host name Modification

 

1. Temporarily modify the Host Name

Show Host Name:

Zhouhh @ zzhh64 :~ $ Hostname

Zhh64

Modify host name:

Zhouhh @ zzhh64 :~ $ Sudo hostname zzofs

Zhouhh @ zzhh64 :~ $ Hostname

Zzofs

Let's take a look at $ PS1.

Zhouhh @ zzhh64 :~ $ Echo $ PS1

/[/E] 0;/u @/h:/w/a/] $ {debian_chroot: + ($ debian_chroot)}/u @/h:/w/$

@ Symbol followed by/h is the host name.

Why didn't the prompt host name be updated before the command line?

Open a terminal and you will see the update.

Zhouhh @ zzofs :~ $

2. Change the host name permanently.

The above changes are only temporary changes, and the changes are restored after the restart.

Permanent modification on redhat/centos

[Root @ localhost ~] # Cat/etc/sysconfig/network

NETWORKING = yes

HOSTNAME = localhost. localdomain

GATEWAY = 192.168.10.1

Modify the HOSTNAME of the network. The host name is located at the beginning and the domain name is located at the end. The host name is ignored.

[Root @ localhost ~] # Vi/etc/sysconfig/network

NETWORKING = yes

NETWORKING_IPV6 = no

HOSTNAME = gdbk

This is a permanent modification and takes effect after restart. I do not know how to take effect immediately.

To take effect immediately, you can use the first method at the same time.

Deb/ubuntu:

Hostname

Localhost. localdomain

Sudo vi/etc/hostname

Enter the hostname in/etc/hostname.

Zhouhh @ localhost :~ $ Cat/etc/hostname

Zhh64

After the restart, the prompt is changed.

Zhouhh @ zhh64 :~ $

If you do not want to restart, use the hostname command.

3. Other modification methods

Use sysctl to modify kernel. hostname

View:

Zhouhh @ zhh64 :~ $ Sysctl kernel. hostname

Kernel. hostname = zhh64

Modify:

Zhouhh @ zhh64 :~ $ Sudo sysctl kernel. hostname = zzh

Kernel. hostname = zzh

Re-open the shell and change it to the following hostname: zhh

Zhouhh @ zhh64 :~ $ Ping zhh64

PING zhh64 (192.168.11.116) 56 (84) bytes of data.

64 bytes from zhh64 (192.168.11.116): icmp_seq = 1 ttl = 64 time = 0.077 MS

Zhouhh @ zhh64 :~ $ Ping centdev

PING centdev (192.168.12.14) 56 (84) bytes of data.

64 bytes from centdev (192.168.12.14): icmp_seq = 1 ttl = 63 time = 0.726 MS

If it is a small Lan, you can complete the hosts file machine configuration, copy to each machine, and then access it directly using the host name during ssh access.

Zhouhh @ zhh64 :~ $ Ssh centdev

Zhouhh @ centdev's password:

Last login: Wed Feb 3 10:03:09 2010 from 192.168.11.116

[Zhouhh @ centdev ~] $

[Zhouhh @ centdev ~] $ Ifconfig eth0 | grep inet

Inet addr: 192.168.12.14 Bcast: 192.168.12.255 Mask: 255.255.255.0

Inet6 addr: fe80: 21e: c9ff: fe57: 2575/64 Scope: Link