Add avoid_docker_exploits.md

avoid_docker_exploits.md

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+● Given the exposed Docker API and high CPU usage, I strongly recommend starting with a fresh Linode. The privileged container access means attackers could have gained full system control.
+
+  Why fresh start is safer:
+
+  1. Persistent access: Attackers often install backdoors that survive container removal
+  2. Rootkit detection: Sophisticated compromises are hard to fully detect and remove
+  3. Time vs security: Rebuilding is faster than forensic analysis for production systems
+
+  If you must keep this instance:
+
+  1. Immediate isolation: Disconnect from network, change all credentials
+  2. Full forensic analysis: Requires security expertise to ensure complete cleanup
+  3. Higher risk: Potential for undetected persistence mechanisms
+
+  For a production CI system, the clean rebuild approach is more secure and time-efficient in the long run.
+
+> What simple steps can I take in the future to make sure this won't happen even as I am setting up my podman containers and testing them?
+
+● Critical Security Steps for Future Setup:
+
+  1. NEVER Expose Docker/Podman API Publicly
+  # UNSAFE (what caused the issue):
+  podman run -p 2375:2375 --privileged ...
+
+  # SECURE Alternatives:
+  # Use UNIX socket (local only)
+  podman run -v /var/run/podman.sock:/var/run/podman.sock
+
+  # Or use SSH tunnel for remote access
+  ssh -L 2375:localhost:2375 user@host
+
+  2. Firewall First Approach
+  # Block all incoming by default
+  sudo ufw default deny incoming
+  sudo ufw default allow outgoing
+
+  # Only open specific needed ports
+  sudo ufw allow ssh
+  sudo ufw allow 80,443  # web only if needed
+  sudo ufw enable
+
+  3. Avoid Privileged Containers
+  # Instead of --privileged, use specific capabilities:
+  podman run --cap-add NET_ADMIN --cap-add SYS_ADMIN ...
+
+  # Or use security opts:
+  podman run --security-opt=no-new-privileges ...
+
+  4. Test in Isolated Network
+  # Create internal network
+  podman network create ci-network
+
+  # Run containers on internal network only
+  podman run --network ci-network ...
+
+● 5. Monitoring During Setup
+  # Watch CPU/memory during testing
+  htop
+
+  # Monitor network connections
+  sudo ss -tulpn
+
+  # Check container processes
+  podman top <container>
+
+  6. Use Temporary Testing Environment
+  - Test container configurations on local machine first
+  - Use development Linode that can be easily rebuilt
+  - Never expose testing containers to public internet
+
+  The key is: never expose container management APIs (Docker/Podman ports) to the internet, and always start with a deny-all firewall policy.