Securing your Linux server is important to protect your data, intellectual property, and time, from the hands of crackers (hackers). The system administrator is responsible for security Linux box. In this first part of a Linux server security series, I will provide 20 hardening tips for default installation of Linux system.
#1: Encrypt Data Communication
#2: Minimize Software to Minimize Vulnerability
#3: One Network Service Per System or VM Instance
#4: Keep Linux Kernel and Software Up to Date
#5: Use Linux Security Extensions
#6: User Accounts and Strong Password Policy
#7: Disable root Login
#8: Physical Server Security
#9: Disable Unwanted Services
#10: Delete X Windows
#11: Configure Iptables and TCPWrappers
#12: Linux Kernel /etc/sysctl.conf Hardening
#13: Separate Disk Partitions
#14: Turn Off IPv6
#15: Disable Unwanted SUID and SGID Binaries
#16: Use A Centralized Authentication Service
#17: Logging and Auditing
#18: Secure OpenSSH Server
#19: Install And Use Intrusion Detection System
#20: Protecting Files, Directories and Email
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