Kubernetes Networking 101

In the ever-evolving landscape of cloud computing, Kubernetes has emerged as the de facto container orchestration system. However, understanding Kubernetes is not a straightforward task, especially when it comes to the intricacies of its networking. In this blog post, we will provide an introduction to Kubernetes networking, a critical topic to master when implementing or managing a Kubernetes-based environment.

Kubernetes networking is a vast subject and revolves around how Pods, the smallest deployable units of computing in Kubernetes, communicate with each other and the outside world. One fundamental principle in Kubernetes networking is that every Pod has its own IP address. This standard allows Pods to interact as if they were physical devices or VMs, making networking more straightforward.

Another principle is that every Pod can communicate with all other Pods, irrespective of the node they reside on. This idea facilitates a distributed network system that helps in managing load balancing and scaling applications.

Understanding Kubernetes networking involves understanding its various components:

In the Kubernetes network model, every Pod gets an IP address, which provides a same IP address to all containers within the Pod. It gives the ability to communicate using standard interprocess communications like SystemV semaphores or POSIX shared memory.

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