High Avaiablilty and load balancing #12642

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  oguzhanagir created 6 months ago

  Support Team

  Hi @WirelessDynamics

  Yes, ASP.NET Zero supports all three concepts, but some parts are available out-of-the-box while others require standard production configuration.

  High Availability

  ASP.NET Zero is HA-ready by design:

  • Uses stateless JWT authentication, so any instance can handle any request
  • Provides a built-in /health endpoint for health checks (DB + cache)
  • Includes Dockerfiles and Kubernetes Helm charts for orchestration
  • Background jobs are designed to avoid conflicts across instances

  However, to make it production-ready for HA, you need to enable a few components:

  • Distributed cache (Redis) - required to share cache across instances
  • SignalR backplane (Redis or Azure SignalR) - required for real-time features in multi-node setups
  • Data Protection key persistence - must be stored in Redis or a shared database to avoid auth/cookie issues
  • Kubernetes probes - connect /health endpoint to liveness/readiness checks

  Load Balancing

  ASP.NET Zero works well behind a load balancer:

  • Supports forwarded headers (X-Forwarded-*) for reverse proxy scenarios
  • Comes with nginx Ingress configuration in Helm charts
  • Sticky sessions are not required due to stateless architecture

  Recommended improvement:

  • Ensure forwarded headers middleware is also enabled in the API Host for correct client IP and scheme handling behind a load balancer

  Active/Active (Multi-Instance)

  Active/Active is supported, but requires proper infrastructure setup.

  Required conditions:

  • Stateless application layer - already supported
  • Shared distributed cache - enable Redis
  • SignalR backplane - configure Redis or Azure SignalR
  • Shared Data Protection keys - persist centrally
  • Background jobs - supported (e.g., Hangfire with SQL Server works safely in multi-instance setups)
  • Database layer - must be highly available (e.g., SQL Server Always On, Azure SQL, etc.)

  Additionally, in Kubernetes deployments:

  • Set multiple replicas
  • Add pod anti affinity rules for true resilience

  Please feel free to contact us if you need any further information.

  Thank you.

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