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Internet Fundamentals

Safe Deploys for a Small Team: Feature Flags, Canaries and a Rollback You Have Practised

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October 26, 2026

5 min read

Shipping often is safer than shipping rarely, if each change is small and easy to undo. How feature flags separate deploying code from releasing features, how canary and blue/green deploys limit the blast radius, and the rollback habits that make a bad deploy a five-minute event.

Internet Fundamentals
Deployments
Feature Flags
CI/CD
Reliability

Three tools

Tool

What it does

Cost

Feature flags

Code ships turned off; you turn it on for staff, then a percentage, then everyone

Flags pile up; remove each one once the feature is fully on

Canary deploys

New version gets a small share of traffic first, with automatic rollback on errors

Needs good metrics and alarms to decide

Blue/green

Two full environments; switch traffic at once, switch back if needed

Double capacity during the switch

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On AWS

  • Lambda aliases with weighted traffic, and CodeDeploy canary or linear configurations that roll back on CloudWatch alarms.

  • ECS rolling, blue/green and canary deployments with alarm-based rollback.

  • AWS AppConfig for feature flags with gradual rollout and automatic rollback, or a flag service you already use.

Rollback habits

  1. Every deploy is one command or one click to undo, and someone has done it recently.

  2. Database changes are backwards compatible (expand, then contract), so rolling back code does not need rolling back data.

  3. Deploy small changes often; a deploy with one change is easy to diagnose.

  4. Watch the error rate and the business metric for fifteen minutes after each deploy, or let the canary do it.

  5. Avoid deploying right before you stop working for the day or the weekend.

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As of October 26, 2026. Provided as is, for general information, and accurate to the best of our knowledge on the date shown. Not legal, compliance, tax, financial or other professional advice. Prices, limits and vendor services change; check current vendor documentation before relying on anything here. Terms of use.