➡️Traffic Shifting

NEW

Gradually redirecting requests from one service version to another to enable safe, controlled rollouts.

DESCRIPTION

Traffic shifting uses weighted routing to migrate requests from an old to a new version in stages. It minimizes risk by monitoring metrics and rolling back if issues arise. Service meshes like Istio and tools like Argo Rollouts automate progressive delivery. Shifting works well with feature flags, canary analysis, and SLO-based gates. It supports zero-downtime deployments and experimentation in production.

ALTERNATIVE DEFINITIONS

Istio

Traffic shifting is directing percentages of traffic to different versions of a service.

Explicitly defines weighted routing across service versions.

Source

Argo Rollouts

Traffic Shifting allows you to progressively transfer traffic from an old version of a service to a new version.

Emphasizes progressive transfer during rollout with automation.

Source

RELATED TERMS

Canary Release Progressive Delivery Weighted Routing Feature Flags Service Mesh A/B Testing Traffic Splitting Rollout

COMPETING TERMS

Blue-Green Deployment Shadow Deployment

KNOWLEDGE AREAS

Software Engineering Infrastructure Observability & Telemetry Testing & Validation

TARGET AUDIENCE

DevOps Engineer Cloud Architect Software Developer IT Project Manager MLOps Engineer Software Architect

EXTERNAL SOURCES

• Wikipedia - Blue-green deployment
• Istio - Istio traffic shifting task guide
• Argo Rollouts - Progressive delivery for Kubernetes
• Google Cloud - Service mesh routing overview

TOP QUESTIONS

Why use Traffic Shifting for deployments?

It reduces risk by incrementally moving traffic while observing metrics. Issues can be caught early and rolled back safely.

Category: Relevancy

How do you measure success during Traffic Shifting?

Track latency, error rates, saturation, and business KPIs. Use automated gates and SLOs to decide whether to advance or rollback.

Category: Requirements

What tools support Traffic Shifting?

Istio, Linkerd, Argo Rollouts, and Spinnaker support weighted routing and progressive delivery on Kubernetes.

Category: Overview

What’s the difference between Traffic Shifting and Blue-Green?

Blue-Green swaps environments with an instant cutover. Traffic shifting gradually moves traffic based on weights and telemetry.

Category: Misunderstanding

What risks exist in Traffic Shifting?

Shadow bugs may appear under partial load. Misconfigured weights or health checks can send too much traffic prematurely.

Category: Risk

How does Traffic Shifting relate to canary analysis?

Traffic shifting implements canary rollout; canary analysis evaluates metrics to validate new versions before increasing traffic.

Category: Example

Can Traffic Shifting be automated?

Yes, with progressive delivery controllers that adjust weights based on metric thresholds and policies.

Category: Management

Where to start learning Traffic Shifting?

Follow Istio’s traffic shifting tutorial, then explore Argo Rollouts for automated progressive delivery.

Category: Requirements

Is Traffic Shifting useful for A/B testing?

It can route cohorts to versions, but experimentation platforms often provide additional randomization and analysis features.

Category: Opinion