Auto-Failover
ELI5 — The Vibe Check
Auto-failover automatically switches to a backup system when the primary one fails — no human intervention needed. Your database server dies at 3 AM? The standby takes over in seconds while you sleep peacefully. It's like having an understudy who's always ready and doesn't need a phone call to go on stage.
Real Talk
Auto-failover is the automatic detection of a primary system failure and switchover to a standby system without manual intervention. It involves health monitoring, failure detection (typically via heartbeat checks), and promotion of a replica or standby. Common in managed databases (RDS Multi-AZ), load balancers, and DNS failover configurations.
When You'll Hear This
"RDS Multi-AZ provides auto-failover — the standby promotes within 60 seconds." / "Auto-failover caught the primary going down and switched over before users noticed."
Related Terms
Disaster Recovery
Disaster recovery (DR) is your plan for when everything goes absolutely wrong — data center floods, region-wide outage, ransomware attack.
Health Check
A Health Check is an automatic 'are you alive?' ping your infrastructure sends to your app regularly.
Replication
Replication means automatically copying your database to one or more other servers in real time. If the main server dies, a replica takes over.