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BENGALURU

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Success story of migrating entire
infrastructure from AWS Singapore to AWS
Mumbai
Pranesh Vittal CG, Database Architect, Medlife.com | 6th Oct 2018.

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What is Medlife.com?

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When did we come into existence?
First Order
Delivered – May
2015
First Production
Deployment – May
2015

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Growth Story

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Growth Story:

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Growth Story:

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Migration Story

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Migration Story:
Stringent Laws

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Migration Story:
AWS Mumbai is cheaper than
AWS Singapore.

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Migration Story:
Stay closer to the users.

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Migration Story:
Aggressive Marketing in the
form of TVC, Online
Marketing, Social Media
Marketing.

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Migration Story:
• Availability of the required services in the target region.
• An opportunity to implement best practices.
• Expiry of Reserved Instances.

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Planning Story

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Technology stack at Medlife.com

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Planning Story:
• Program Duration : 2 Months.
• VPC Peering between the two regions.
• Segregating Automated & Manual tasks.
• Scarce documentation available on this topic.

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Planning Story (Continued):
• See yourself transition from unknown-unknowns to known-knowns.
• No half-hearted attempts.
• Keep the stake holders informed about what to expect, the risks, the
timelines, the additional costs etc…
• Nurture a good team with mix of DevOps, Development, QA Teams.
• Plan well in advance for any time-critical tasks like data sync.

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Planning Story (Continued):
• Prefer DNS names over IP values.
• Review AWS limits of the target region to avoid last minute surprises.
• Practice with smaller instance type during automation tests.
• Always have a good rollback plan in place in case of unforeseen errors.
• Make best use of Business or Enterprise support.

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Execution Story

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Execution Story on the D-Day:
• No major release before the migration.
• Enough rest time for the core migration team.
• Don’t engage the whole team for the migration.
• Have a positive mindset.

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Execution Story on the D-Day (Continued):
• Blue-Green deployment using Terraform, Jenkins, Chef
• Once all the required infrastructure was ready.
 Switch the Primary MongoDB replica set member from
Singapore to Mumbai region.
 Change the Route53 rules from Singapore to Mumbai region.
 Migrate the services that required manual intervention.

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