Hostname is used to display the system's DNS name, and to display or set its hostname or NIS domain name.
Hostname help you:
- recognize machine
- know when run commands against the machine
# to show the name of your computer
hostname
----
master-node
Hostname is stored in /etc/hostname
cat /etc/hostname
----
master-node
Hostname need to be existed in /etc/hosts as well.
Other commands
hostname -f # full name
hostname -I # show the machine IP on the system
hostnamectl
----
Static hostname: master-node
...
Change hostname
sudo hostnamectl set-hostname <new-hostname>
# update hosts
sudo nano /etc/hosts
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127.0.0.1 localhost
127.0.1.1 <new-hostname> <shorten-version>