Linux Server Hardening: Security → Performance → Automation (Full Guide)

Описание: 🛡️ Linux System Administration: Complete Server Hardening & Automation

⚡ Why This Matters:
85% of breaches exploit basic security misconfigurations (IBM 2024) - these skills are mandatory for all SysAdmins!

💻 Today’s Comprehensive Lab:

1. OS Hardening Checklist:
```bash
User Account Security
sudo passwd -l unused_user # Lock unused accounts
sudo userdel -r old_user # Remove obsolete users
Service & Port Security
sudo systemctl stop unused_service # Stop unnecessary services
sudo netstat -tulnp # Check listening ports
sudo firewall-cmd --list-all # Verify firewall rules
SSH Hardening
sudo vi /etc/ssh/sshd_config # Disable root login, change port

2. Performance Tuning:
```bash
tuned profiles
sudo tuned-adm list # List available profiles
sudo tuned-adm recommend # Get recommended profile
sudo tuned-adm profile throughput # Set performance profile
Process priority
nice -n 15 cpu_intensive_task # Start with low priority
renice -n 10 -p 1234 # Change running process priority

3. Ansible Automation:
```bash
Install Ansible
sudo yum install ansible
Basic inventory setup
sudo vi /etc/ansible/hosts
First playbook
ansible all -m ping # Test connectivity

4. Network Diagnostics:
```bash
tracepath example.com # Path discovery
traceroute -I google.com # ICMP traceroute

🔥 Pro Tip: Use semanage port -l to view SELinux port contexts before changing service ports!

📥 How to setup OpenLDAP:
https://kifarunix.com/install-and-set...

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