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Migration Documentation

Introduction

This document serves as comprehensive documentation of the migration process, providing runbooks, configurations, and best practices to ensure a successful migration of the web application from the current hosting provider to Amazon Web Services (AWS).

Requirements

Before initiating the migration process, ensure the following requirements are met:

  • Access to AWS Management Console with appropriate permissions for provisioning resources.
  • Understanding of the current web application architecture, including server configurations, databases, and dependencies.
  • Access to domain registrar or DNS provider for updating DNS records.
  • Backup of all website files, databases, and other data from the current hosting provider.
  • Familiarity with AWS services such as EC2, RDS, S3, CloudFront, Route 53, and IAM for provisioning and configuring resources.

Runbooks

1. Pre-Migration Runbook

  • Verify prerequisites and requirements for the migration process.
  • Perform a comprehensive assessment of the existing infrastructure and applications.
  • Develop a migration plan, including timelines, resource requirements, and dependencies.
  • Communicate migration plan and timelines to stakeholders and teams involved.

2. Data Migration Runbook

  • Backup website files, databases, and other data from the current hosting provider.
  • Transfer website files to Amazon S3 and configure static website hosting.
  • Migrate databases to Amazon RDS and update database connection settings.
  • Validate data integrity and consistency post-migration.

3. Application Setup Runbook

  • Launch EC2 instances and configure web servers with appropriate software and settings.
  • Create and configure RDS database instances with necessary parameters.
  • Set up VPC, subnets, security groups, and network configurations.
  • Deploy application code and configure environment variables.

4. Networking Connectivity Runbook

  • Configure VPCs, subnets, route tables, and internet gateways.
  • Implement security groups and NACLs to control network traffic.
  • Set up DNS resolution, DNS hostnames, and DNS records in Route 53.
  • Integrate CDN services like CloudFront for content delivery optimization.

5. Security and Compliance Runbook

  • Implement IAM users, roles, and policies for secure access management.
  • Configure encryption for data at rest and in transit using KMS and SSL/TLS.
  • Enable compliance standards like PCI DSS, HIPAA, and GDPR as per requirements.
  • Set up logging, monitoring, and auditing using CloudWatch, CloudTrail, and AWS Config.

6. Performance Optimization Runbook

  • Implement caching mechanisms using ElastiCache, CloudFront, and CDN.
  • Configure autoscaling, instance types, and sizes for optimal resource utilization.
  • Fine-tune server configurations, database settings, and application performance.
  • Monitor performance metrics and optimize based on insights gathered.

7. Monitoring and Management Runbook

  • Set up CloudWatch alarms, logs, and dashboards for monitoring key metrics.
  • Enable CloudTrail for tracking API activity and AWS resource changes.
  • Implement AWS Config for continuous configuration monitoring and compliance.
  • Utilize Trusted Advisor for automated checks and optimization recommendations.

8. Testing and Validation Runbook

  • Conduct thorough testing of the migrated web application for functionality, performance, and security.
  • Perform end-to-end testing, user acceptance testing (UAT), and load testing.
  • Validate DNS updates, data synchronization, and application behavior post-migration.
  • Document and address any issues or discrepancies found during testing.

9. Cutover and Go-Live Runbook

  • Coordinate DNS updates and data synchronization activities with stakeholders.
  • Monitor traffic and validate functionality during the go-live process.
  • Conduct post-migration reviews and document lessons learned.
  • Implement performance optimizations and security enhancements as needed.

Best Practices

  • Follow the principle of least privilege when granting access permissions.
  • Regularly backup data and configurations to prevent data loss and ensure recoverability.
  • Automate provisioning and configuration using Infrastructure as Code (IaC) tools like AWS CloudFormation or AWS CDK.
  • Implement a disaster recovery (DR) plan and conduct regular DR drills to test recovery procedures.
  • Stay updated with AWS best practices, security advisories, and compliance requirements for ongoing maintenance and optimization.

Conclusion

By following the documented runbooks, configurations, and best practices outlined in this documentation, you can ensure a smooth and successful migration of the web application to AWS. Thorough planning, testing, and adherence to best practices are key to achieving a secure, performant, and reliable environment in the cloud.