CentOS 7.x Migrate ssh based file sharing server

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If there is file sharing server on public cloud such as AWS EC2 where files are transferred using ssh/sftp/rsync etc. then to migrate such server to new instance use following steps:

1. Create instance with public SSH enabled from any IP
2. In case of AWS ensure that public IP does not change on shutdown/power-on via Elastic IP
3. Connect to instance using downloaded keypair:

   ssh -i <> centos@<ip>

4. Get root terminal and install vim

   sudo su -
   yum -y install vim

5. Allow key based access to root user using 'vim ~/.ssh/authorized_keys' from
   1. Downloaded key pair (Note 155x)
   2. Personal SSH key pair
   3. Backup server SSH key pair
   4. Older server being migrated
6. Change hostname of the new VM

   vim /etc/hostname
   hostname

7. Copy /etc/shadow, /etc/passwd, /etc/group from old server to new OR create the user account again on new server with same password
8. Enable password based SSH using 'vim /etc/ssh/sshd_config' and update

   PasswordAuthentication yes

9. Restart SSH for changes to take effect

   systemctl restart sshd

10. Setup CentOS 7.x fail2ban
11. Rsync files from older server to new server

    rsync -vaHz --delete /home/ root@<new-ip>:/home/

    After this do 'ls -al /home' on new server and ensure all UID/GID got migrated successfully

12. Shutdown older server
13. Update DNS entry, if any, to point to new server public (elastic) IP
14. CentOS 7.x adding swap space using file

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