How was the rollout of a new service to production? What difficulties were faced during the migration?

When rolling out a new service to production, we usually follow these steps:

1. Environment preparation: setting up servers, databases, network rules.
2. CI/CD: automating build and deployment through pipelines.
3. Testing: running integration and load tests on staging.
4. Gradual release: using blue-green deployment or canary releases to minimize risks.
5. Monitoring: setting up logging and metrics for quick problem detection.

Difficulties during migration:

• Environment incompatibility: differences between staging and production lead to bugs.
• Database migration issues: errors in migrations can cause data loss or downtime.
• Unexpected loads: the service may not withstand real traffic.
• Configuration errors: incorrect parameters, secrets, or environment variables.
• Lack of rollback: if there is no quick rollback mechanism, problems worsen.

In my experience, thorough testing of migrations and setting up monitoring were crucial to quickly respond to incidents.