Kubernetes follows an “IP-per-pod” model where each pod get assigned an IP address and all containers in a single pod share the same network namespaces and IP address. Kubernetes does not provide an implementation of this model by default, rather it relies on third-party tools that comply with the following requirements: all containers are able to communicate with each other without NAT nodes are able to communicate with containers without NAT and a container’s IP address is the same from inside and outside the container. The Kubernetes networking model, on the other hand, natively supports multi-host networking in which pods are able to communicate with each other by default, regardless of which host they live in. In this scenario, it’s up to the Docker operator to avoid port clashes between containers. In order to communicate across nodes with Docker, we have to map host ports to container ports and proxy the traffic. This means containers running on different machines are not able to communicate with each other (as they are attached to different hosts’ networks). It is a per-host private network where containers get attached (and thus can reach each other) and allocated a private IP address. The Docker networking model relies, by default, on a virtual bridge network called Docker0. For more background on Kubernetes components, see Kubernetes Architecture.įor further reading, see Kubernetes Documentation: Cluster Networking – Summary › Kubernetes vs. Pods behave much like VMs or physical hosts with respect to port allocation, naming, load balancing and application configuration. Kubernetes provides an IP address to each pod so that there is no need to map host ports to container ports as in the Docker networking model. The Kubernetes networking model supports different types of open source implementations. Since a Kubernetes cluster consists of various nodes and pods, understanding how they communicate between them is essential. Incoming Traffic from the Outside World.Kubernetes Networking Model Implementations.
In this page you’ll find everything you need to know about Kubernetes Networking:
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