💾 HAProxy with Keepalived Container

A robust, selfhost-ready Docker container combining HAProxy load balancing with Keepalived for high availability. This solution provides automatic failover capabilities and efficient load distribution for your services.

✨ Features

• High Availability: Automatic failover using Keepalived VRRP
• Load Balancing: Advanced load balancing with HAProxy
• Health Checks: Automated service health monitoring
• Easy Configuration: Simple environment variable configuration
• Alpine-based: Lightweight and secure base image
• Fixed Scale: 2 load balacing/failover deployments, serving 2 backend servers
• HAProxy stats: Near real-time feed of the proxied services

🚀 Quick Start

# Pull the image
docker pull peterweissdk/haproxy-keepalived

# Run with custom configuration
docker run -d \
  --name haproxy-keepalived \
  --cap-add=NET_ADMIN \
  --cap-add=NET_BROADCAST \
  --cap-add=NET_RAW \
  --net=host \
  --env-file=.env \
  peterweissdk/haproxy-keepalived

# Run the container using the provided Docker Compose and .env file
docker compose up -d

🔧 Configuration

Environment Variables

System Configuration

| Variable | Description | Example |

• TZ: System Timezone - Europe/Berlin

Keepalived Settings

| Variable | Description | Example |

• VRRP_INSTANCE: VRRP instance name - VI_1
• INTERFACE: Network interface - eth0
• STATE: Node state (MASTER/BACKUP) - MASTER
• PRIORITY: Node priority (1-255) - 100
• ROUTER_ID: Unique router ID - 50
• VIRTUAL_IPS: Virtual IP address - 192.168.1.100/24
• UNICAST_SRC_IP: Source IP for unicast - 192.168.1.11
• UNICAST_PEERS: Peer IP address - 192.168.1.12

HAProxy Default Settings

| Variable | Description | Example |

• PROTOCOL_DEFAULT: Default protocol - tcp
• TIMEOUT_CLIENT_DEFAULT: Client timeout (seconds) - 10
• TIMEOUT_CONNECT_DEFAULT: Timeout, connect to a backend server (seconds) - 5
• TIMEOUT_SERVER_DEFAULT: Server timeout (seconds) - 10

HAProxy Frontend Settings

| Variable | Description | Example |

• NAME_FRONTEND: Frontend name - ha-frontend
• PORT_FRONTEND: Listen port - 5001
• PROTOCOL_FRONTEND: Frontend protocol - tcp
• OPTION_FRONTEND: Frontend options - tcplog
• DEFAULT_BACKEND: Default backend name - ha-backend

HAProxy Backend Settings

| Variable | Description | Example |

• NAME_BACKEND: Backend name - ha-backend
• PROTOCOL_BACKEND: Backend protocol - tcp
• OPTION_BACKEND: Backend options - tcp-check
• BALANCE_BACKEND: Server scheduling - roundrubin

Backend Servers

| Variable | Description | Example |

• NAME_SERVER1: Backend name - backend-server1
• IP_SERVER1: Server IP address - 192.168.1.21
• PORT_SERVER1: Listen port - 6001
• NAME_SERVER2: Backend name - backend-server2
• IP_SERVER2: Server IP address - 192.168.1.22
• PORT_SERVER2: Listen port - 6002

🏗️ Building from Source

# Clone the repository
git clone https://github.com/peterweissdk/haproxy-keepalived.git

# Build the image
cd haproxy-keepalived
docker build -t haproxy-keepalived .

📝 Directory Structure

.
├── conf/
│   ├── haproxy/
│   │   └── haproxy.cfg_tpl
│   ├── keepalived/
│   │   └── keepalived.conf_tpl
│   └── supervisor/
│       ├── haproxy.ini
│       └── keepalived.ini
├── .env
├── Dockerfile
├── docker-entrypoint.sh
├── supervisord.conf
├── healthcheck.sh
├── LICENSE
└── README.md

🔍 Health Check

The container includes built-in health checks for both HAProxy and Keepalived services. Monitor the status using:

docker inspect --format='{{json .State.ExitCode}}' <container_name>

View the Docker health check logs with the following command:

docker inspect --format='{{json .State.Health}}' <container_name>

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

🆘 Support

If you encounter any issues or need support, please file an issue on the GitHub repository.

📄 License

This project is licensed under the GNU GENERAL PUBLIC LICENSE v3.0 - see the LICENSE file for details.