Install and configure a firewall:
Install and configure a firewall to protect the server from external threats.
Harden SSH
Harden the SSH protocol by disabling root login and changing the default port.
Install and configure an intrusion detection system:
Install and configure an intrusion detection system to monitor the server for malicious activities.
Lock down services
Disable services that are not needed and remove any unnecessary accounts.
Perform regular security scans
Perform regular security scans to check for vulnerabilities in the system.
Patch and update
Ensure that the system is up-to-date with the latest security patches and updates.
Monitor logs
Monitor log files for suspicious activity.
Backup regularly
Perform regular backups of the system in case of an emergency.