What Is Failover? Automatic Redundancy for Critical Services

Failover is the automatic process of switching to a redundant or standby system when the primary system fails. The goal is to maintain service with minimal downtime, ideally transparently to users.

How Fly.io Handles Failover

Fly.io runs your VMs on distributed infrastructure. If a physical host becomes unavailable, Fly detects the failure through its health checks and reschedules your VMs on healthy hosts. This happens automatically, without manual intervention.

OpenClaw Failover Considerations

For a Telegram bot deployed with OpenClaw:

• Telegram's webhooks can be delivered to any of your region instances if you use multi-region
• If a VM fails, Fly starts a new one from your last deploy
• Telegram's message delivery will retry failed webhooks, providing a natural buffer

Designing for Failover

To maximize uptime:

1. Deploy to multiple regions
2. Don't store critical state on a single VM's ephemeral filesystem
3. Use persistent volumes for data that must survive VM restarts
4. Set appropriate health checks so Fly knows quickly when to restart

What Failover Can't Fix

Failover doesn't protect against application bugs, bad config deploys, or dependency failures (your AI API going down). For those, you need application-level error handling, canary deployments, and monitoring.