What are the solutions for enhancing security on Linux systems?

The security reinforcement strategy for Linux systems is as follows:

1. Regularly update and patch vulnerabilities: Keep your system and applications up to date, install the latest security patches to fix known vulnerabilities.
2. Implement a strong password policy: establish requirements for password complexity, including a combination of password length, numbers, letters, and special characters, and require regular password changes.
3. Disable unnecessary services: shut down or disable network services and processes that are not needed in order to reduce the attack surface.
4. Set up a firewall: restrict network traffic using a firewall to only allow necessary inbound and outbound connections.
5. Regularly back up data: Create scheduled backups to prevent data loss and malicious attacks.
6. Install security software: Install and configure security software such as Intrusion Detection Systems (IDS), Intrusion Prevention Systems (IPS), etc.
7. Enable security auditing and log monitoring: Activate the security auditing feature to record and monitor system activity, and regularly review logs to detect unusual behavior.
8. Mandatory access control: Restrict user access to system resources using access control lists (ACL) and user permission management.
9. Encrypting the file system: Using an encrypted file system to protect sensitive data.
10. Regular security checks: Conduct regular system security scans and vulnerability assessments, as well as review and update security policies.

Here are some common Linux security hardening solutions that can be customized based on specific needs and configured according to actual requirements.