Systems Analyst: What is the difference between blue-green and rolling deployment?

Blue-Green — instant switch. Rolling — gradual replacement.

Blue-Green Deployment:

• Two identical environments.
• Instant traffic switch.
• Easy rollback.
• Requires double resources.

Rolling Deployment:

• Gradual replacement.
• One instance at a time.
• No downtime.
• Uses existing resources.

Key differences:

• Blue-Green — instant.
• Rolling — gradual.
• Blue-Green — double resources.
• Rolling — same resources.