CentOS 7.x Migrate ssh based file sharing server

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CentOS 7.x migrate ssh based file sharing server

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 from downloaded key pair, personal SSH keys and older server being migrated using 'vim ~/.ssh/authorized_keys' (Note 155x)
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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