Stable Network Identity.
If you have a pet, you must give it a name so that you can call it. Similarly, a stateful application node must have a well-defined hostname and IP address so that other nodes in the same application knows how to reach it. A ReplicaSet does not offer this functionality as each Pod receives a random hostname and IP address when it starts or is restarted. In stateless applications, we use a Service that load-balances the Pods behind it and offers a URL through which you can reach any of the stateless Pods. In a stateful app, each node may want to connect to a specific node. A ReplicaSet cannot serve this purpose.
Learn more about Kubernetes Stateful Service Patterns: https://www.magalix.com/blog/kubernetes-patterns-the-stateful-service-pattern
Ahmed Atef
Posted on • Originally published at magalix.com
Kubernetes Patterns : The Stateful Service Pattern
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