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Source: https://www.mongodb.com/containers-and-orchestration-explained
Kubernetes
Kubernetes is an orchestration tool. It is an open-source system for automating deployment, scaling, and management of containerized applications.
It groups containers that make up an application into logical units for easy management and discovery.
rkt
rkt is an application container engine developed for modern production cloud-native environments. It has been introduced by CoreOS in December 2014. rkt integrates with Kubernetes.
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