🚀 Server Failover Switcher

This project continuously monitors a list of predefined servers and automatically switches to the one with the best performance (lowest latency). It is designed for real-time failover in case of network degradation or server failure.

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📦 Project Structure

server_checker.py

Main script responsible for:

• Loading server list from servers.json
• Measuring latency (ping) to each server
• Comparing latencies and determining the optimal server
• Switching to a faster server if needed
• Recording the current active server in current_server.txt
• Logging all actions to /var/log/server_checker.log

servers.json

Configuration file containing a list of target server IPs or domain names:

{
  "servers": [
    "8.8.8.8",
    "1.1.1.1",
    "9.9.9.9"
  ]
}

current_server.txt

Stores the IP or hostname of the currently active server to avoid unnecessary switching.

/var/log/server_checker.log

Log file containing:

• Health check results
• Failover events
• Error messages

Sample log entry:

[2025-04-24 12:00:00] Switched to better server: 1.1.1.1 (ping: 24ms)

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⚙️ Installation & Usage

1. Install dependencies (if needed):

sudo apt update
sudo apt install python3 git

2. Clone the repository:

git clone https://github.com/CodeByMaks/server-failover-switcher.git
cd server-failover-switcher

3. Manual execution:

python3 server_checker.py

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🔁 Automate via cron

1. Edit crontab:

crontab -e

2. Add a job to run every 5 minutes:

*/5 * * * * /usr/bin/python3 /path/to/server_checker.py

Replace /path/to/ with the absolute path to the script.

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💡 Use Case Example

This script is ideal for setups such as VPN gateways, routers, or cloud-based services that require always using the fastest and most stable connection available.

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🛡 Tips

• Add only reliable and low-latency servers in servers.json
• Make sure the cron user has execution permission for Python and write access to the log file
• Adjust file permissions accordingly when logging to /var/log

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Made with ❤️ for automated resilience and network stability 🙌

Contributions and improvements are welcome. Feel free to open an Issue or submit a Pull Request!