One of the challenges of Kubernetes networking is addressing how internal (east-west) traffic and external (north-south) traffic interact, because the internal network is isolated from the external network. Because Pods share the same network namespace and have their own IP addresses, they can find and communicate with all other Pods on all nodes using localhost, without using network address translation (NAT). Pods communicate with each other following network policies set by the network plugin, communicating with other Pods without explicitly creating links between them or mapping container ports to host ports. Pod-to-Pod communication is the foundation of Kubernetes. There is container-to-container communication, Pod-to-Pod communication, Pod-to-service communication, and external-to-service communication. The different components in the Kubernetes platform (Pods, containers, nodes, applications) use different networking methods to communicate.
The master can communicate with each node in a cluster or it can communicate directly to any individual Pod.
The containers in a Pod all move together, are scheduled together, and are terminated together. Containers are always created in Pods, and multiple containers can be created in one Pod. It has its own filesystem, CPU, memory, and process space. Containers: A Kubernetes container is like a virtual machineĀ that shares its Operating System (OS) among several applications.Each Pod is assigned an IP address, and all the containers in the Pod share the same storage, IP address, and port space (network namespace). They are created with an API server and placed by a controller. The Pods are groups of containers that share networking and storage resources from the same node. Pods: Kubernetes PodsĀ are inspired by pods found in nature (pea pods or whale pods).A Kubernetes Pod network connects several interrelated components: