Jtti: What are the commonly used Linux system security tips?

Ensuring the security of Linux systems is one of the top priorities for system administrators and users. Here are some simple yet effective Linux system security tips:

　1.
Regularly update the system:

　-Apply system updates and security patches in a timely manner to ensure that the system is not affected by known vulnerabilities.

　2.
Use a strong password:

　-Force the use of complex, long passwords that contain numbers and special characters to avoid using passwords that are easy to guess.

　3.
Disable unnecessary services:

　-Close unnecessary network services and ports to reduce the attack surface of the system.

　4.
Firewall settings:

　- Use firewall configuration to restrict inbound and outbound network traffic, allowing only necessary services to pass.

　5.
Restrict user permissions:

　-Give users the minimum necessary permissions and use sudo to execute sensitive commands to reduce potential attack surfaces.

　6.
Monitoring log files:

　- Regularly check system log files, pay attention to abnormal activities, and discover potential security issues in a timely manner.

　7.
Enable SELinux or AppArmor:

　-Use SELinux or AppArmor to strengthen system security and restrict process access permissions.

　8.
Back up data regularly:

　-Establish a regular backup strategy to ensure that data can be quickly restored in the event of a system failure or attack.

　9.
Use SSH key authentication:

　-Disable password login and use SSH key authentication to improve authentication security.

　10.
Check system files regularly:

　-Use tools such as Tripwire to regularly check whether system files have been tampered with.

　11.
Restrict su access:

　-Restrict access to the su command and only allow specific users to use su to switch to root.

　12.
Enable two-step verification:

　 - For important accounts, enable two-step verification to add an additional layer of authentication.

　13.
Use minimal installation:

　-When installing the system, choose minimal installation and install only necessary software packages to reduce potential vulnerabilities.

　14.
Encrypted communication:

　-Use SSL/TLS encryption protocol to protect the transmission of sensitive data.

　15.
Review user activity:

　-Regularly review user activities to ensure that abnormal activities can be discovered in time.

　16.
Avoid using the root user directly:

　-Avoid using the root user directly to perform operations, use an ordinary user and escalate privileges through sudo.

These tips are only part of enhancing the security of Linux systems. Maintaining system security requires system administrators to continue to pay attention to new threats and vulnerabilities and take appropriate measures to protect the system.

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