Production release deployment strategies 

The five deployment strategies for software delivery:

1. Blue/Green Deployment:

• Two environments: Blue (current, active) and Green (new version).

• Traffic is switched to the Green environment after deployment and testing.

• The Blue environment acts as a fallback if issues occur.

2. Canary Deployment:

• New version is rolled out gradually.

• A small percentage of traffic (e.g., 25%) is initially sent to the new version.

• Once stable, more traffic is routed to the new version (e.g., 75%).

3. A/B Testing:

• Two versions (e.g., V1 and V2) run simultaneously for different user groups.

• Helps determine which version performs better based on user feedback or metrics.

4. Feature Flag:

• Feature toggles control new features.

• New features can be enabled for specific users (e.g., 20%) without deploying new code.

5. Rolling Deployment:

• New version is rolled out in stages (e.g., Stage 0 to Stage 3).

• Gradually replaces instances of the old version without downtime.