Upgrades

Use rolling strategies to keep traffic online while upgrading services and databases.

Rolling updates

• Deploy new replicas alongside existing ones
• Gradually shift traffic to updated replicas
• Retire older replicas only after health checks pass

Database migrations

• Test migrations in staging before production
• Prefer backward-compatible schema changes
• Avoid dropping or renaming columns while serving live traffic

Rollbacks

• Retain previous Docker images to enable quick rollback
• Revert database changes using rollback or down migration scripts when required
• Validate application behavior and data integrity before restoring full traffic