How is the management of server updates and rollback of changes carried out if necessary?

Server update management and rollback are usually implemented using the following approaches:

1. CI/CD pipelines — automation of build, testing, and deployment of code. Updates go through tests and are automatically rolled out to servers.

2. Canary release — updating first on a small part of servers or users to check stability, and only then on all.

3. Blue-Green deployment — maintaining two identical environments (blue and green). The new version is rolled out to the inactive environment, and after verification, traffic is switched to it. If something goes wrong, it quickly reverts to the old one.

4. Versioning and configuration management — storing versions of applications and configurations to quickly rollback to a previous stable version.

5. Monitoring and alerts — tracking the state of servers and applications after updates to quickly detect problems.

6. Backup — creating backups of data and configurations before updates.

Rollback example: if after deployment the new version causes errors, Blue-Green or Canary can quickly switch traffic back to the old version, minimizing downtime and losses.