Tuesday, May 26, 2015

Load balancing Kubernetes

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Kubernetes is excellent for running (web) applications in a clustered way. This blog will go into making applications deployed on Kubernetes available on an external, load balanced, IP address. Before diving into HTTP load balancers there are two Kubernetes concepts to understand: Pods and Replication Controllers.

A Replication Controller describes a deployment of a container. One of the aspects to configure on a Replication Controller is the number of replicas. Each replica will run on a different Kubernetes node. This way an application or application component can be replicated on the cluster, which offers failover and load balancing over multiple machines. Each instance of a replica is called a Pod. Kubernetes will monitor Pods and will try to keep the number of Pods equal to the configured number of replicas.

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