How to Change the Hostname of Ubuntu Server ?

We can change the hostname of a machine by several ways. I am mentioning one way to change the hostname of Ubuntu server.

  1. Open the terminal or Login with putty.exe as root user (if you are working remotely)
  2. Goto /etc/
  3. Type nano hostname
  4. Change the HOSTNAME to your preferred machine name
  5. Press Cntrl+X
  6. Save the configuration by pressing Y
  7. Log off or reboot

Note: Add the new hostname and ipaddress in the /etc/hosts file also

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How to Change the Hostname of CentOS or RedHat Linux systems?

We can change the hostname of a machine by several ways. I am mentioning two ways to change the hostname.

Method 1 :- Editting /etc/sysconfig/network file

  1. Open the terminal or Login with putty.exe as root user (if you are working remotely)
  2. Goto /etc/sysconfig/
  3. Type nano network
  4. Change the HOSTNAME to your preferred machine name
  5. Press Cntrl+X
  6. Save the configuration by pressing Y
  7. Log off or reboot

Method 2:- EdittingĀ  /proc/sys/kernel/hostname file

  1. Open the terminal or Login with putty.exe as root user (if you are working remotely)
  2. Goto /proc/sys/kernel/
  3. Type nano hostname
  4. Change the HOSTNAME to your preferred machine name
  5. Press Cntrl+X
  6. Save the configuration by pressing Y
  7. Close the terminal and login again

In this method, no reboot is required to get the change in effect

Note: Add the ipaddress and new hostname to /etc/hosts file also