The Doppler Quarterly Spring 2018 | Page 64

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Figure 2 : Weaveworks Sock Shop microservice architecture

Kubernetes

Enter the container orchestration system called Kubernetes , originally conceived and developed by Google and now maintained by the Cloud Native Computing Foundation . Kubernetes , or " K8s " ( pronounced " kates "), is a container-centric management platform . Other container orchestration solutions exist , such as Docker Swarm and Mesos Marathon , but Kubernetes has significant traction and only looks to be picking up steam . Three main concepts comprise a K8s system . The first is the Pod , which is a set of related containers guaranteed to run on the same node and is the smallest deployable unit that can be created , scheduled and managed . The second is the concept of a controller embodied within the K8s master node , which controls the lifecycle of Pods running on a cluster of worker nodes , and manages the lifecycle of a “ deployment .” This includes scheduling , maintaining defined state and orchestrating updates to Pods and containers . Finally is the K8s concept of a “ service ” defining how to access the application ( e . g ., through a load balancer ), so that a user of the service need not know anything about the configuration specifics of the underlying Pods .

62 | THE DOPPLER | SPRING 2018