Kubernetes networking.

Filed under: Architecture, Main
08 November 2023

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One comment “Kubernetes networking.”

  1. admin Says:
    November 8, 2023 в 8:20 am

    Simplifying Kubernetes Networking
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    Kubernetes networking is crucial for facilitating communication between various components within the kubernetes ecosystem and external applications. The key principles of kubernetes networking include:
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    Container-to-Container Networking: Containers in the same pod can communicate via localhost and port numbers. They share network resources, IP addresses, and port space within the same network namespace.

    Pod-to-Pod Networking: This involves communication between pods, whether they are on the same node or different nodes. Each node is assigned a classless inter-domain routing (CIDR) block, ensuring that each pod has a unique IP address. Virtual ethernet devices (veth or veth pair) connect these pods, allowing data to flow through a network bridge.

    Pod-to-Service Networking: Kubernetes services provide a layer of abstraction by mapping a single virtual IP address to a group of pod IP addresses, allowing seamless communication and load balancing between them.

    Internet-to-Cluster Networking: enables external access to services and applications within a Kubernetes cluster. It involves both Egress and Ingress networking.

    Egress Networking: Handles traffic from the cluster to external destinations like services or APIs. It uses NAT (Network Address Translation) and the internet gateway to map internal IP addresses to external ones, allowing communication with the broader internet. Cluster-IPs and IP tables are used to route outgoing traffic.

    Ingress Networking: Manages incoming traffic from the internet to services in the cluster. An Ingress Controller routes traffic based on domain names and URL paths. It acts as an entry point, receiving requests, and directing them to the appropriate services within the cluster.
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    In summary, kubernetes networking is essential for enabling effective communication within a kubernetes environment. It encompasses various aspects, including container-to-container networking, pod-to-pod networking, pod-to-service networking, and internet-to-cluster networking. These principles help ensure that containers, pods, and services can interact seamlessly, both within the cluster and with external resources.

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