Container is a unit of software that packages up code and all of its dependencies. Container images become containers at run time. Containerized software will always run the same regardless of the the infrastructure.
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What is a container runtime?
A container runtime is software that executes containers and manages container images on a node. Docker engine is one such container runtime.
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Containers and Virtual Machines. The Difference?
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What is Container Orchestration and Kubernetes?
Managing few containers and a fewer applications is not a difficult task. But if you have 1000s of containers and services managing them is difficult. Container orchestration is about managing lifecycle of contaienrs in large environments.
Container orchestration achieves following
provision and deploy containers
scaling up or removing containers to spread application load evenly
Moving containers between hosts
Resource allocation
Load balancing
Health monitoring
Kubernetes and Docker swarm are examples of container orchestration tools.
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