How to implement canary deployments in the cloud

· Category: Cloud Computing

Short answer

Canary deployments route a small percentage of traffic to a new version, allowing you to validate before full rollout.

Steps

  1. Deploy the new version alongside the stable version.
  2. Configure the load balancer or service mesh to send 5-10% traffic to the canary.
  3. Monitor error rates, latency, and business metrics.
  4. Gradually increase traffic or rollback if issues arise.
  5. Promote to 100% and decommission the old version.

Tips

  • Use feature flags for even finer-grained rollouts.
  • Service meshes like Istio simplify canary traffic splitting.
  • Automated analysis (e.g., Flagger) can promote or rollback automatically.

Common issues

  • Database schema changes must be backward compatible during the transition.
  • Uneven load splitting can skew metric comparisons.