You can use hostname/hostnamectl command to show or set the system’s host name and dnsdomainname command to show the system’s DNS domain name. But the changes are temporary if you use these commands. Local hostname and the domain name of your server defined in text configuration file located in /etc directory.
How to use hostnamectl command
If you are using systemd based distro such as RHEL/CentOS 7.x, Fedora latest, Ubuntu Linux 16.04 LTS, Debian 9.x+, Arch Linux and more, use hostnamectl command. To see current hostname, run:
$ hostnamectl
To change hostname to foo, run:
$ hostnamectl set-hostname 'foo'
$ hostnamectl
A note about GUI tools
If you are using Red Hat or Fedora Linux (older version) use redhat-config-network GUI tool. Type following command and click on DNS tab > Setup hostname and domain name:
# redhat-config-network
On other hand you can edit a text file. Find out and set up the value for HOSTNAME in the file /etc/sysconfig/network:
# vi /etc/sysconfig/network
Setup/replace HOSTNAME
HOSTNAME=web.nixcraft.com
Where, web is hostname and nixcraft.com is your DNS domain name.
If you are using Debian Linux
You need to edit /etc/hostname file and put hostname.domain.com in this file:
# vi /etc/hostname
Set or replace hostname:
web.nixcraft.com
Debian, Suse and other Linux distro support GUI tool called network-admin. Type following command and click on DNS tab > Setup hostname and domain name:
$ network-admin
Please note that you must have properly configured DNS server to work FQDN based hostname. See how to configure Linux as a dns client.
See also:
- Ubuntu Linux Change Hostname (computer name)
- Debian Linux: Change Hostname / Computer Name Permanently
- Linux change my hostname / computer system name
- Linux Change Hostname
- RHEL / Centos Linux 7: Change and Set Hostname Command
- OpenBSD Change Hostname
- CentOS Linux 5/6 Change Hostname Command
- Linux setting hostname and domain name of my server
- FreeBSD Change Hostname without reboot
- SuSe Linux Change Hostname without reboot
- How to set the hostname on Fedora Linux
- Ubuntu 18.04 LTS change hostname permanently
- Ubuntu set hostname permanently (computer name) command
- OpenSUSE Linux set hostname permanently (computer name) command
- RHEL 8 Linux set hostname permanently (computer name) command
- CentOS 8 Linux set hostname permanently (computer name) command
- Ubuntu 20.04 LTS set hostname permanently (computer name) command
- Set / Change FQDN on Ubuntu 20.04 LTS
- Alpine Linux - Setting system hostname
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thank you bro. it is really helpfull
I think we have to restart the network service after making the changes.
service network restart
Thank you so much for this information. It was very useful for me!
Do you also want to tell in your artice about restarting services so the new changes can come to effect? At the moment the article is half baked.
thanks a lot.
Thanks a lot from a CentOS newbie.
hi I want to learn linux .what step should i follow?
Step1: Change the New Values in the Host file
[root@erp ~]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
192.168.0.1 erp.myappsdba.com erp
[root@erp ~]#
Step2: Change the New Values in the network file
[root@erp ~]# cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=erp.myappsdba.com
GATEWAY=192.168.0.3
Step3: Change the New Values in the sysctl.conf and resolv.conf files
[root@erp ~]## cat /etc/sysctl.conf
kernel.hostname=erp.myappsdba.com
kernel.domainname=myappsdba.com
[root@erp etc]# cat /etc/resolv.conf
search myappsdba.com
nameserver 192.168.0.7
nameserver 192.168.0.2
option attemts : 5
option timeout :15
[root@erp etc]#
Step4:Ping the Host Name or Changed IP Address.
[root@erp etc]# ping myappsdba.com
PING myappsdba.com (192.168.0.1) 56(84) bytes of data.
64 bytes from fortedc.myappsdba.com (192.168.0.1): icmp_seq=1 ttl=128 time=1.06 ms
Step5:Restart the Network or Reboot the system for effecting the changes
[root@erp ~]# init 6 or
[root@erp ~]# service network restart
Thanks for the good article. @Nilesh Thanks dude
Please help me connect to server with a Linux netbook. There is a box for the name of the server… but I don’t know it.