# High Availability

High availability patterns for bindcar and BIND9 deployments.

## Overview

This section covers strategies for deploying bindcar and BIND9 in highly available configurations.

## Primary-Secondary Architecture

Deploy multiple BIND9 instances with zone transfers:

- Primary server with bindcar for zone management
- Secondary servers for redundancy and geographic distribution
- Automatic zone transfers (AXFR/IXFR)

## Load Balancing

Distribute DNS queries across multiple BIND9 instances:

- Round-robin DNS
- Geographic load balancing
- Health-checked backends

## Kubernetes Deployments

- StatefulSets for stable network identities
- ReadinessProbes for traffic management
- PodDisruptionBudgets for maintenance

## Future Enhancements

Detailed HA patterns and configurations coming soon.

## Next Steps

- [Deployment](../operations/deployment.md) - Deployment patterns
- [Kubernetes](../operations/kubernetes.md) - Kubernetes deployment
