What are the best ways to test and validate cloud migration?

Best way to do functional testing is writing test scenarios in your favorite framework. After you cover all scenarios doing the migration is very easy, just deploy the app to the new cloud environment then run your test suite against new url, if all passes you are good to go. But still I would suggest to do end to end browser testing after all auto tests.

Ensure that all documentation, including migration plans, configurations, and procedures, is up-to-date and reflects the current state of the cloud deployment. Train the IT team on managing and maintaining the cloud environment, promoting a smooth transition post-migration.

Testing & validating cloud migration is crucial to ensure a smooth & successful transition. Here are some best practices & methods to test & validate your cloud migration: Pilot Migration Comprehensive Testing Automated Testing Performance Testing Data Migration Testing Security Testing User Acceptance Testing (UAT) Monitoring & Logging Validation Backup & Disaster Recovery Testing Documentation Review Collaborate with Stakeholders Rollback Plan. By following these best practices, you can increase the likelihood of a successful & well-validated cloud migration.

For performance testing I would suggest jmeter or whichever your favorite tool which can measure the response times and can give you a result table for all end points. Also there are some paid service like blazemeter and beotys neoload whic they record user real scenarios and run agains new cloud. Also dynatrace or appdynamics or cloudwatch(aws) or azure monitor are good tools to measure how is your performance on new cloud. I would suggest if you do not see any improvements on new cloud start readin cloud documentation there must something missing in the config or app structure which can improve the performance on new cloud.

Evaluate the performance of your applications in the cloud environment to ensure they meet or exceed the performance levels of your on-premises setup.

Based on the trends one should thoroughly test the migration of data, ensuring that it is accurate, complete, and maintains integrity during the transfer.

User acceptence testing in short UAT should done by real user to see if the application behaves like it is expected, it is done manually. Until customers are not satisfied we improve/develop the application, after all covered, it should be released to production. This is the last control before production therefore it should be taken very seriously and all scenarios should be covered in all details.

Verify that security measures, such as encryption, access controls, and identity management, are properly implemented and meet compliance standards.

Risk Assessment Testing Environments Functional Testing Performance Testing Security Testing Data Migration Testing Backup and Restore Testing Network and Connectivity Testing Scalability Testing Monitoring and Logging User Acceptance Testing (UAT) Documentation Review Rollback Plan Continuous Monitoring Post-Migration

One another important pillar about choosing cloud is the budget, we need to be careful about destination cloud because in case of spikes or big compains, we should not pay more then campaign itself. There are many ways to measure cost compare between cloud I suggest use them and decide after, after you move put a budget limit on your cloud otherwise you may wake up with empy bank account one day. And one last thing always watchout for cross cloud priceses and be ready to change your cloud provider. Market changes everyday.