mirror of https://github.com/johndoe6345789/docker-swarm-termina.git synced 2026-04-24 13:45:01 +00:00

Files

Claude 08d7ee16af Add comprehensive Docker debugging and CapRover configuration

- Enhanced Docker connection diagnostics in backend
  - Detailed logging of Docker environment variables
  - Socket permission and existence checks
  - User/group information logging
  - Multiple connection attempt strategies
  - Automatic diagnostics on startup

- Updated captain-definition with proper Swarm configuration
  - Added explicit Docker socket mount with read-write access
  - Configured User as root for socket access
  - Added DOCKER_HOST environment variable
  - Configured restart policy and replica settings

- Updated Dockerfile to run as root for Docker socket access

- Created comprehensive CapRover deployment documentation
  - Step-by-step deployment instructions
  - Troubleshooting guide
  - Security considerations
  - Architecture diagrams

- Updated backend README with debugging and deployment info

These changes fix the "Cannot connect to Docker" error by ensuring
proper permissions and providing detailed diagnostics for troubleshooting.

https://claude.ai/code/session_01NfGGGQ9Zn6ue7PRZpAoB2N

2026-01-30 19:10:42 +00:00

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Backend - Flask API

Python Flask backend for Docker container management.

Features

RESTful API for container management
Docker SDK integration
Session-based authentication
CORS enabled for frontend access

Setup

Install dependencies:

pip install -r requirements.txt

Configure environment (optional):

cp .env.example .env
# Edit .env with your settings

Run the server:

python app.py

The server will start on http://localhost:5000

API Endpoints

Authentication

POST /api/auth/login - Login with username/password
POST /api/auth/logout - Logout current session

Containers

GET /api/containers - List all containers (requires auth)
POST /api/containers/<id>/exec - Execute command in container (requires auth)

Health

GET /api/health - Health check

Docker

Build the Docker image:

docker build -t docker-swarm-backend .

Run the container:

docker run -p 5000:5000 -v /var/run/docker.sock:/var/run/docker.sock docker-swarm-backend

Debugging

The application includes comprehensive Docker connection diagnostics that run automatically on startup. Check the logs for:

Docker environment variables (DOCKER_HOST, DOCKER_CERT_PATH, etc.)
Docker socket existence and permissions
Current user and group information
Connection attempt results

Example output:

=== Docker Environment Diagnosis ===
DOCKER_HOST: unix:///var/run/docker.sock
✓ Docker socket exists at /var/run/docker.sock
Socket permissions: 0o140777
Readable: True
Writable: True
Current user: root (UID: 0, GID: 0)
✓ Successfully connected to Docker using Unix socket
✓ Docker connection verified on startup

If connection fails, the diagnostics will show detailed information about what's wrong.

CapRover Deployment

For deploying to CapRover (which uses Docker Swarm), see the detailed guide in CAPROVER_DEPLOYMENT.md.

Key points:

Uses captain-definition file with serviceUpdateOverride to mount Docker socket
Runs as root to access Docker socket
Includes enhanced debugging for troubleshooting connection issues
Only supports 1 replica (Docker socket can't be shared)

Security

⚠️ This backend requires access to the Docker socket. Ensure proper security measures are in place in production environments.

Security Considerations:

Container has root access to the host system via Docker socket
Implement strong authentication (change default credentials)
Restrict network access to the API
Only use in trusted environments
Monitor logs for suspicious activity
Consider using a Docker socket proxy for additional security

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