Скачать или смотреть How to Change Hostname on AWS EC2 Instance | Customize Hostname of AWS EC2

How to Change Hostname on AWS EC2 Instance | AWS | Amazon web service for beginners
Could not set static hostname: Access denied

How to Change Hostname on AWS EC2 Instance | Customize Hostname of AWS EC2

if hostnamectl command is not found
apt-get install systemd
yum install systemd // centos

hostnamectl status /
hostnamectl
hostnamectl set-hostname app-server
hostnamectl set-hostname app-server--static
hostnamectl set-hostname app-server --transient
hostname set-hostname "app-server" --pretty

hosts This file describes a number of hostname-to-address
mappings for the TCP/IP subsystem. It is mostly
used at boot time, when no name servers are running.
On small systems, this file can be used instead of a
"named" name server.
Syntax:
# IP-Address Full-Qualified-Hostname Short-Hostname
127.0.0.1 localhost

# special IPv6 addresses
::1 localhost ipv6-localhost ipv6-loopback

nslookup ip-172-31-41-206

OR

cat /etc/hostname
vi /etc/hostname

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