Private Server C9 -

All can be self‑hosted with Docker and offer LSP, debuggers, and Git integration out of the box. The legacy Cloud9 private server is a hidden gem for ultra‑lightweight, ephemeral, or offline development. Its small memory footprint (~80 MB idle) and real‑time terminal make it ideal for IoT device coding, secure facility workstations, or teaching programming on low‑cost Chromebooks.

[Install] WantedBy=multi-user.target

(using a manager script). This prevents users from seeing each other’s files or crashing the host. 6. Hardening & Security Considerations | Threat | Mitigation | | ------------------------------- | -------------------------------------------------------------------------- | | Arbitrary command execution | Run as non‑root user; use --cap-drop=ALL in Docker. | | File system escape | Workspace chroot / bind‑mount to a dedicated directory. | | Resource exhaustion | Docker --memory="512m" --cpus="0.5" . | | Plaintext passwords | Terminate with HTTPS (nginx reverse proxy + Let's Encrypt). | | Session hijacking | Enable -s (secure cookies) and force WebSocket over WSS. | | Brute force | Put behind Authelia, OAuth2 Proxy, or Cloudflare Access. | Nginx reverse proxy example (HTTPS + WebSocket) server listen 443 ssl; server_name c9.example.com; ssl_certificate /etc/letsencrypt/live/...; location / proxy_pass http://127.0.0.1:8181; proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "upgrade"; proxy_set_header Host $host; private server c9

Deploy legacy c9 only behind a hardened reverse proxy, with per‑user Docker workspaces, and monitor resource usage. Keep a migration plan ready. All can be self‑hosted with Docker and offer

[Unit] Description=Cloud9 IDE After=network.target [Service] Type=simple User=c9user Group=c9user WorkingDirectory=/opt/cloud9 ExecStart=/usr/bin/node server.js -p 8181 -l 0.0.0.0 -w /home/c9user/workspace -a username:hashed_password Restart=on-failure RestartSec=10 [Install] WantedBy=multi-user

FROM node:16-bullseye-slim RUN apt update && apt install -y git curl build-essential python3 psmisc && git clone https://github.com/c9/core.git /c9 && cd /c9 && npm install --production