What does "immutable infrastructure" imply in the context of Docker?

Immutable infrastructure in the context of Docker refers to a methodology where infrastructure is not altered after deployment. This means that once a container is deployed, it remains unchanged. If updates or changes are necessary, the approach involves creating a new version of the container rather than modifying the existing one. This practice leads to more predictable and stable environments, as the components of the infrastructure are static and consistent.

By adopting immutable infrastructure, teams can ensure that deployments are repeatable and less prone to errors, as the same immutable image can be deployed across different environments. Furthermore, if there's an issue with a version, it can be easily rolled back to a previous, stable version by redeploying that specific image. This fosters a clear and manageable approach to application lifecycles, allowing for easier troubleshooting and maintenance without the risks associated with mutable changes to the infrastructure.