Types of hostnames
The hostname can be configured as follows
- Static host name assigned by sysadmin. For example, “server1”, “wwwbox2”, or “server42.cyberciti.biz”.
- Transient/dynamic host name assigned by DHCP or mDNS server at run time.
- Pretty host name assigned by sysadmin/end-users and it is a free-form UTF8 host name for presentation to the user. For example, “Vivek’s netbook”.
hostnamectl command
Let us see how to use the hostnamectl command.
How do I see the host names?
$ hostnamectl ## OR ## $ hostnamectl status
Sample outputs:
Static hostname: centos-7-rc Icon name: computer Chassis: n/a Machine ID: b5470b10ccfd49ed8e4a3b0e953a53c3 Boot ID: f79de79e2dac4670bddfe528e826b61f Virtualization: oracle Operating System: CentOS Linux 7 (Core) CPE OS Name: cpe:/o:centos:centos:7 Kernel: Linux 3.10.0-229.1.2.el7.x86_64 Architecture: x86_64
How do I set the host name?
The syntax is:
# hostnamectl set-hostname Your-New-Host-Name-Here # hostnamectl set-hostname "Your New Host Name Here" --pretty # hostnamectl set-hostname Your-New-Host-Name-Here --static # hostnamectl set-hostname Your-New-Host-Name-Here --transient
To set host name to “R2-D2”, enter:
# hostnamectl set-hostname R2-D2
To set static host name to “server1.cyberciti.biz”, enter:
# hostnamectl set-hostname server1.cyberciti.biz --static
To set pretty host name to “Senator Padmé Amidala’s Laptop”, enter:
# hostnamectl set-hostname "Senator Padmé Amidala's Laptop" --pretty
To verify new settings, enter:
# hostnamectl status
Sample outputs:
Static hostname: server1.cyberciti.biz Pretty hostname: Senator Padmé Amidala's Laptop Transient hostname: r2-d2 Icon name: computer Chassis: n/a Machine ID: b5470b10ccfd49ed8e4a3b0e953a53c3 Boot ID: f79de79e2dac4670bddfe528e826b61f Virtualization: oracle Operating System: CentOS Linux 7 (Core) CPE OS Name: cpe:/o:centos:centos:7 Kernel: Linux 3.10.0-229.1.2.el7.x86_64 Architecture: x86_64
How do I delete a particular host name?
The syntax is:
# hostnamectl set-hostname "" # hostnamectl set-hostname "" --static # hostnamectl set-hostname "" --pretty
How do I change host name remotely?
Use any one of the following syntax:
# ssh root@server-ip-here hostnamectl set-hostname server1
OR set server1 as host name on a remote server called 192.168.1.42 using ssh:
# hostnamectl set-hostname server1 -H root@192.168.1.42
Reference
- nixCraft – RHEL / Centos Linux 7: Change and Set Hostname Command
- Setup DHCP or Static IP address from command line
Note:
- hostnamectl exists on RHEL/Centos7, Debian8 (validated)
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