updated solutions for practice scenerios

src/solutions/service-management.md

@@ -63,4 +63,138 @@ curl localhost
 - Log Analysis
 - Security Configuration
 
-[Additional scenarios will be documented here as completed] 
+[Additional scenarios will be documented here as completed] 
+
+---
+---
+
+## Scenario: Time Synchronization and Security Configuration
+
+### Original Problem
+- Configure chronyd to sync with time server 'time.example.com'
+- Configure firewall to allow HTTP (port 80) and HTTPS (port 443)
+- Create an SELinux policy to allow Apache to listen on port 8080
+- Configure SSH to disable root login and only allow key-based authentication
+- Set up a cron job to run system updates every Sunday at 2 AM
+
+### Environment
+- OS Version: RHEL/Rocky Linux
+- Initial State:
+- Required Outcome:
+
+### Solution Steps
+1. Configure chronyd to sync with time server 'time.example.com'
+   ```bash
+   # Install chrony
+   sudo dnf install chrony
+
+   # Configure chronyd to sync with time server 'time.example.com'
+   sudo vi /etc/chrony.conf
+
+   # Add the following line to the file
+   server time.example.com iburst
+
+   # Save and exit
+   :wq
+   ```
+   The output should show the chrony service enabled and running
+   
+   # Enable and start service
+   sudo systemctl enable chronyd
+   sudo systemctl start chronyd
+   sudo systemctl status chronyd
+   ```
+   The output should show the chrony service enabled and running
+
+2. Configure firewall to allow HTTP (port 80) and HTTPS (port 443)
+   ```bash
+   # Install firewalld
+   sudo dnf install firewalld
+
+   # Enable and start firewalld
+   sudo systemctl enable --now firewalld
+
+   # Configure firewall to allow HTTP (port 80) and HTTPS (port 443)
+   sudo firewall-cmd --add-service=http --permanent
+   sudo firewall-cmd --add-service=https --permanent
+   ```
+   The output should show the firewall rules added
+
+3. Create an SELinux policy to allow Apache to listen on port 8080
+   ```bash
+   # Install policycoreutils
+   sudo dnf install policycoreutils
+
+   # Create an SELinux policy to allow Apache to listen on port 8080
+   sudo semanage port -a -t http_port_t -p tcp 8080
+   ```
+   The output should show the SELinux policy created
+
+4. Configure SSH to disable root login and only allow key-based authentication
+   ```bash
+   # Configure SSH to disable root login and only allow key-based authentication
+   sudo vi /etc/ssh/sshd_config
+
+   # Disable root login
+   PermitRootLogin no
+
+   # Allow key-based authentication
+   PubkeyAuthentication yes
+
+   # Save and exit
+   :wq
+
+   # Restart SSH service
+   sudo systemctl restart sshd
+   ```
+   The output should show the SSH configuration updated
+
+5. Set up a cron job to run system updates every Sunday at 2 AM
+   ```bash
+   # Set up a cron job to run system updates every Sunday at 2 AM
+   sudo crontab -e
+
+   # Add the following line to the file
+   0 2 * * 0 sudo dnf update
+
+   # Save and exit
+   :wq
+   
+   # Check status of cron service
+   sudo systemctl status cron
+   ```
+   The output should show the cron job added
+
+### Verification
+```bash
+# Check chrony status
+sudo systemctl status chronyd
+
+# Check firewall status
+sudo firewall-cmd --list-all
+
+# Check SELinux status
+sudo getenforce
+
+# Check SSH status
+sudo systemctl status sshd
+
+# Check cron status
+sudo systemctl status cron
+```
+
+### Key Learnings
+- Understanding of systemd
+- Understanding of SELinux
+- Understanding of SSH
+- Understanding of cron
+- Understanding of firewall
+- Understanding of time synchronization
+
+## Skills Demonstrated
+- Service Management
+- SELinux Management
+- SSH Configuration
+- Cron Job Management
+- Firewall Configuration
+- Time Synchronization