How to Change Hostname on Ubuntu 24.10

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Displaying the Current Hostname

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To find out your current system name by running the following command.

hostnamectl

Output:

root@server:~# hostnamectl
 Static hostname: server
       Icon name: computer-vm
         Chassis: vm 🖴
      Machine ID: 7e3c835b73b44f50a7e676144e993199
         Boot ID: e1342d5b583e457683444259eee32b05
    Product UUID: ab5e548c-fe08-4f6f-82c8-cd8ac4b87875
  Virtualization: kvm
Operating System: Ubuntu 24.10                         
          Kernel: Linux 6.11.0-9-generic
    Architecture: x86-64
 Hardware Vendor: Red Hat
  Hardware Model: KVM
Firmware Version: 1.16.0-4.module_el8.8.0+3612+f18d2b89
   Firmware Date: Tue 2014-04-01
    Firmware Age: 10y 7month 1d    

Changing the System Hostname

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Now that you know the current hostname, you can change the hostname by using the following command and set the hostname as follows.

hostnamectl set-hostname vps.crowncloud.net

Replace "vps.crowncloud.net" with your preferred hostname.

Also, it is necessary to update the hostname in the /etc/hosts file to successfully change the name of the Ubuntu server.

nano /etc/hosts

Replace the old hostname with the new hostname, then save the file and exit.

  127.0.0.1 localhost
  127.0.1.1 vps.crowncloud.net

  # The following lines are desirable for IPv6 capable hosts
  ::1     ip6-localhost ip6-loopback
  fe00::0 ip6-localnet
  ff00::0 ip6-mcastprefix
  ff02::1 ip6-allnodes
  ff02::2 ip6-allrouters

If cloud-init is installed on your Ubuntu server, you'll also have to modify the cloud.cfg file. To edit the cloud.cfg file, by using the following command.

nano /etc/cloud/cloud.cfg

Find preserve_hostname: false and change it to preserve_hostname: true.

preserve_hostname: true

Save the file and exit,

Verify the change

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To verify the hostname has been fully changed, enter the hostnamectl command:

hostnamectl

Output:

root@server:~# hostnamectl
 Static hostname: vps.crowncloud.net
       Icon name: computer-vm
         Chassis: vm 🖴
      Machine ID: 7e3c835b73b44f50a7e676144e993199
         Boot ID: e1342d5b583e457683444259eee32b05
    Product UUID: ab5e548c-fe08-4f6f-82c8-cd8ac4b87875
  Virtualization: kvm
Operating System: Ubuntu 24.10                         
          Kernel: Linux 6.11.0-9-generic
    Architecture: x86-64
 Hardware Vendor: Red Hat
  Hardware Model: KVM
Firmware Version: 1.16.0-4.module_el8.8.0+3612+f18d2b89
   Firmware Date: Tue 2014-04-01
    Firmware Age: 10y 7month 1d