CentOS7

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Change server hostname

[root@localhost ~]# hostnamectl status

  Static hostname: localhost.localdomain
        Icon name: computer-vm
          Chassis: vm
       Machine ID: 399b74f54385ee0d782648666a204c25
          Boot ID: 411893b81fee4fb0b865e1b18fd8dd6d
   Virtualization: kvm
 Operating System: CentOS Linux 7 (Core)
      CPE OS Name: cpe:/o:centos:centos:7
           Kernel: Linux 3.10.0-123.el7.x86_64
     Architecture: x86_64

Set the hostname. 

[root@localhost ~]# hostnamectl set-hostname centos7.internal

Check the host name again (Close the session and open new session using putty or console)

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