This comprehensive guide explains Kubernetes networking fundamentals, compares major CNI plugins such as Flannel, Calico, and Cilium, and provides detailed troubleshooting steps for pod communication, service routing, DNS issues, and eBPF‑based enhancements, helping operators build reliable, high‑performance clusters.
This article explains the Kubernetes network model, introduces the CNI standard, and compares four popular network plugins—Flannel, Calico, Weave Net, and Cilium—highlighting their features, advantages, and suitable use cases for different cluster sizes and requirements.
This comprehensive guide walks you through Kubernetes' network model, explains why networking is its biggest pain point, compares major CNI plugins with real‑world performance data, and provides a step‑by‑step decision framework, tuning tips, troubleshooting methods, and monitoring best practices for production environments.
This guide walks through installing Flannel as a CNI plugin, configuring its three network models, planning a two‑node Kubernetes cluster, setting up certificates, creating configuration files and startup scripts, verifying pod connectivity, and fine‑tuning iptables rules for proper inter‑pod communication.
This tutorial walks through preparing three CentOS 7 hosts, installing Docker and Kubernetes components, initializing a master node, handling common errors, joining worker nodes, installing a CNI plugin, testing the cluster, and provides essential kubectl commands for ongoing management.
This comprehensive guide explains Kubernetes' layered architecture, core components, and container networking fundamentals, covering IP‑per‑Pod, CNI plugins, Flannel and Calico implementations, DNS, Service types, Ingress, and public‑cloud networking strategies for multi‑cluster deployments.
This tutorial walks through Kubernetes CNI networking, introduces common plugins, explains Flannel's three network models, details cluster planning, software download, installation, configuration, supervisor setup, service startup, pod‑to‑pod connectivity verification, iptables rule optimization, and DNS troubleshooting for a functional Flannel‑based cluster.
This article compares Flannel and Calico, two Kubernetes CNI plugins, detailing their architectures, backend mechanisms, routing models, overlay and non‑overlay options, and highlighting Flannel's simplicity for small clusters versus Calico's richer feature set for larger, production‑grade environments.
This article introduces the five most popular Kubernetes CNI network plugins—Flannel, Calico, Weave Net, Cilium, and Canal—detailing their features, typical use‑cases, and installation commands to help you choose the right solution for your cluster.
This article explains how Kubernetes assigns unique IP addresses to Pods using Flannel as the CNI network provider and Containerd as the container runtime, covering underlying concepts like Linux bridges, VXLAN encapsulation, node IPAM, and the interactions among kubelet, CRI, and CNI plugins.
This guide walks you through preparing Linux machines, configuring system settings, installing Docker and Kubernetes components with kubeadm, initializing a master node, deploying a pod network, joining worker nodes, and verifying the cluster, providing a complete step‑by‑step tutorial for building a Kubernetes cluster.
This guide explains the background of Multus CNI, details its architecture and CNI type classification, and provides step‑by‑step commands to deploy Multus alongside Calico and Flannel, configure network interfaces, modify Calico IP detection, and verify multi‑network pod connectivity in a Kubernetes cluster.
This guide explains the background, architecture, and step‑by‑step deployment of Multus CNI in a Kubernetes cluster, including configuring Calico and Flannel as primary and secondary networks, creating network attachment definitions, and testing pod connectivity across multiple interfaces.
This guide explains why Multus CNI is needed for multi‑network pods in Kubernetes, describes its architecture, walks through installing Multus alongside Calico and Flannel, shows how to configure NetworkAttachmentDefinitions, adjust Calico’s NIC selection, and demonstrates testing pod connectivity and routing limitations.
This article provides a comprehensive overview of Kubernetes network architecture, including CNI plugins, network policies, service discovery, and ingress controllers, with practical configuration examples.
This article examines Kubernetes networking models, detailing underlay and overlay concepts, the role of layer‑2/3 infrastructures, and how CNI plugins like Flannel, Calico, IPVLAN, Multus, and DANM implement these models for efficient pod communication.
This article explains how Kubernetes ensures each Pod receives a unique IP address by detailing the roles of the network provider, CNI plugins, CRI, and container runtimes such as containerd, with a focus on Flannel's vxlan and bridge implementations.
This article explains how Kubernetes assigns a unique IP address to each pod by detailing the roles of container runtimes, CRI, CNI plugins, Flannel's vxlan encapsulation, Linux bridges, and the node IPAM controller that allocates podCIDR subnets across the cluster.
This article explains the fundamentals of Kubernetes networking, describes its flat network architecture, reviews common CNI implementations such as Flannel, Project Calico, and Weave Net, and details the various communication pathways including container‑to‑container, pod‑to‑pod, pod‑to‑service, and internet‑to‑service.
This article explains how Kubernetes ensures each Pod gets a unique IP address by detailing the roles and interactions of Flannel, CNI plugins, the CRI, and the kube‑controller‑manager, and shows the configuration steps needed for container runtimes like containerd.
This article explains how Kubernetes networking components—including Linux Bridge, Flannel's VXLAN, the node IPAM controller, kubelet, container runtimes, and CNI plugins—work together to give every pod a unique IP address and enable inter‑pod communication across nodes.
This article explains Kubernetes' networking architecture by detailing the underlay and overlay models, comparing layer‑2 and layer‑3 designs, and reviewing common CNI implementations such as Flannel, Calico, Multus, and DANM, along with their underlying technologies.
This article explains Kubernetes networking models, detailing the underlay network infrastructure, overlay techniques, and common CNI implementations such as Flannel, Calico, IPVLAN, and VxLAN, while comparing their architectures, protocols, and configuration considerations.
This article provides a comprehensive overview of Kubernetes networking by explaining the concepts of underlay and overlay network models, describing their implementations such as flannel host‑gw, Calico BGP, IPVLAN/MACVLAN, and tunneling technologies like VxLAN and IPIP, and offering practical references for each approach.
This article provides a comprehensive overview of Kubernetes networking, explaining the concepts of underlay and overlay network models, their implementations with Flannel, Calico, IPVLAN, MACVLAN, Multus, DANM, and common tunneling protocols such as VxLAN, IPIP, and GRE, while highlighting practical configuration notes and architectural differences.
This comprehensive guide walks you through installing Docker and containerd, configuring yum repositories, setting up kubeadm/kubelet/kubectl, initializing a multi‑master Kubernetes cluster, enabling Flannel CNI and IPVS, building a Nginx‑Keepalived HA load balancer, deploying the Kubernetes dashboard, configuring NFS storage with a dynamic provisioner, and installing a secure Harbor image registry for private images.
This step‑by‑step guide shows how to prepare three CentOS 7 nodes, install containerd, configure system settings, deploy kubeadm/kubelet/kubectl, initialize a Kubernetes v1.22.1 control plane, add worker nodes, install the flannel CNI plugin, set up the Dashboard, and clean up the environment.
This article explains how Kubernetes ensures container-to-container communication using network namespaces, veth pairs, bridges like docker0, and advanced CNI plugins such as Flannel and Calico, detailing their underlying Linux networking components, routing mechanisms, and deployment considerations for both intra‑host and inter‑host scenarios.
This article explains Kubernetes networking fundamentals, including intra‑pod communication, pod‑to‑pod traffic, service IP routing, and compares CNI plugins like Flannel and Calico with details on IPIP and BGP optimizations.
This article explains the fundamentals of Kubernetes networking, compares popular CNI implementations such as Flannel, Calico, and Weave Net, and details the key networking scenarios—including container‑to‑container, pod‑to‑pod, pod‑to‑service, and Internet‑to‑service—required for reliable and secure cluster operation.
This article explains the fundamentals of container networking in Kubernetes, covering network namespaces, veth pairs, bridges, CNI plugins such as Flannel and Calico, their routing modes, and practical command‑line examples that illustrate intra‑host and cross‑host communication.
This article explains Docker’s built‑in network drivers, the construction and external exposure of the default bridge network, and then dives into Kubernetes networking challenges, illustrating how Flannel provides cross‑node Pod communication through subnet allocation, virtual interfaces, and packet encapsulation.
This article explains how Flannel implements container networking in Kubernetes using two backends—VXLAN for encapsulated cross‑node traffic and host‑gw for direct routing—detailing packet flow, routing configuration, and performance considerations.
This article walks through Docker's built‑in network drivers—including bridge, host, none, overlay, macvlan and plugins—then dives into Kubernetes networking, detailing Pod communication, the Flannel CNI workflow, and how data traverses virtual bridges and physical interfaces.
This article explains Kubernetes container networking fundamentals, covering pod-to-pod communication, Linux network namespaces, veth pairs, bridges, and the various CNI plugins such as Flannel and Calico that enable cross‑host networking with overlay, routing, and underlay modes.
This comprehensive tutorial walks through preparing a CentOS 7 host, configuring hostnames, disabling swap and firewalls, installing Docker and Kubernetes components with kubeadm, setting up the master and worker nodes, deploying the flannel network plugin, testing with nginx, and installing the Kubernetes dashboard, all with detailed commands and troubleshooting tips.
This tutorial walks through preparing three CentOS 7.6 nodes, installing and configuring containerd, setting up kubeadm, kubelet, and kubectl, initializing a Kubernetes v1.22.1 control plane, adding worker nodes, deploying the Flannel CNI plugin, installing the Kubernetes Dashboard, and providing cleanup commands, all with detailed commands and configuration files.
This tutorial walks through preparing three CentOS 7.6 nodes, disabling firewalls and SELinux, configuring sysctl and ipvs, installing containerd and its dependencies, generating containerd and kubeadm configurations, initializing the control plane, adding worker nodes, deploying the Flannel CNI plugin and Kubernetes Dashboard, and finally cleaning up the cluster.
This article explains Kubernetes container networking fundamentals, the role of Linux network namespaces, veth pairs, bridges, and iptables, and compares same‑host communication via docker0 with cross‑host solutions like CNI plugins (flannel, Calico) and their routing modes.
This tutorial walks through preparing three Linux VMs, disabling firewalls and swap, configuring sysctl, installing Docker and Kubernetes components, initializing the master node, joining worker nodes, deploying the Flannel CNI plugin, creating a test nginx pod, and accessing it via a NodePort service.
This article explains how Kubernetes enables container-to-container communication using network namespaces, veth pairs, bridges, and CNI plugins such as Flannel and Calico, covering both intra‑host networking with docker0 and cross‑host networking models, routing rules, and BGP‑based solutions.
This article explains the fundamentals of container networking in Kubernetes, covering Linux network namespaces, veth pairs, Docker's default bridge, CNI plugins such as Flannel and Calico, their routing modes, and practical command‑line examples for cross‑host communication.
This article explains the fundamentals of Kubernetes container networking, covering the network stack, bridge, veth pairs, host networking, ARP resolution, and then dives into cross‑host communication methods, comparing Overlay solutions such as Flannel and Calico with Underlay approaches like BGP, illustrated with concrete commands and diagrams.
This article explains the fundamental principles of Kubernetes container networking, covering network namespaces, veth pairs, bridges, iptables, and routing, and compares intra‑host communication with cross‑host solutions such as CNI plugins, overlay, host‑gw, and Calico’s BGP‑based approaches.
This article explains the fundamental principles of Kubernetes container networking, how Docker’s default bridge and veth pairs connect pods on the same host, and compares various CNI plugins and routing models for cross‑host communication, including Flannel and Calico.
This article explains Flannel's role in Kubernetes networking, shows how to deploy it, details its supported data‑forwarding modes such as VXLAN and Host‑GW, and walks through the complete packet journey from a source pod to a destination pod.
This article explains the fundamental principles of container networking in Kubernetes, covering pod-to-pod communication, Linux network namespaces, veth pairs, Docker bridge, and advanced CNI plugins such as Flannel and Calico, including their overlay, routing, and underlay modes with practical command examples.
This guide walks through preparing three CentOS 7.6 servers, configuring system settings, installing Docker and Kubernetes components, initializing the master node, deploying a pod network, adding worker nodes, and setting up the Kubernetes dashboard, providing all necessary commands and troubleshooting tips.
This tutorial walks through configuring server hosts, generating TLS certificates with cfssl for etcd and Kubernetes components, deploying an etcd cluster and Kubernetes master services (apiserver, controller‑manager, scheduler) via systemd, setting up kubelet and kube‑proxy on worker nodes, installing Docker, applying Flannel CNI, and adding additional worker nodes to the cluster.
This article explains Docker’s built‑in network drivers—including bridge, host, none, overlay, macvlan and plugins—detailing their setup and external access, then explores Kubernetes networking challenges and how Flannel implements pod‑to‑pod communication through virtual interfaces, routing, and encapsulation.
This article explains the fundamentals of VXLAN, why it is preferred over VLAN, and provides a step‑by‑step guide on configuring Flannel in VXLAN mode within a Kubernetes cluster to achieve cross‑node pod communication.
A Kubernetes cluster experienced a 45‑second delay on one master when running kubectl get nodes due to missing flannel MAC entries, and the issue was resolved by restarting the canal CNI component to refresh ARP/FDB information.
This article explains how Kubernetes networking components—including the container runtime, CRI, CNI plugins, Flannel, and node IPAM—work together to assign unique IP addresses to each Pod across a cluster, covering both same‑host and cross‑host communication mechanisms.
Flannel, a Kubernetes CNI plugin, creates a host overlay network using VXLAN to assign unique virtual IPs to pods, encapsulate traffic, and coordinate routing via etcd, with detailed explanations of its components, packet flow, and underlying Linux networking mechanisms.
This guide explains how Flannel works as a Kubernetes CNI overlay network, detailing its VXLAN mode, the roles of cni0, flannel.1 and flanneld, routing and FDB handling, and provides command‑line examples to trace pod‑to‑pod traffic across nodes.
This article provides a detailed, step‑by‑step tutorial for installing Kubernetes v1.16.0 on CentOS 7 virtual machines, covering Docker‑CE installation, prerequisite system configuration, master and node setup, flannel network plugin deployment, and includes all necessary command‑line snippets and the full kube‑flannel.yml manifest.
This tutorial walks through preparing the environment, installing Docker‑CE 18.09.9, configuring prerequisite settings, deploying Kubernetes v1.16.0 master and node components, initializing the cluster, retrieving join commands, and finally installing Flannel networking to achieve a ready‑state cluster on CentOS 7 virtual machines.
This step‑by‑step guide shows how to prepare five CentOS 7.5+ machines, configure hostnames, SSH keys, kernel upgrades, firewall and swap settings, set up Docker and Kubernetes repositories, install Docker, kubeadm, kubelet and kubectl, configure HAProxy + Keepalived for a VIP, initialize a multi‑master cluster, apply the Flannel network plugin, and verify the deployment with an Nginx pod and the Kubernetes dashboard.
This step‑by‑step guide shows how to prepare five CentOS 7 machines, configure hostnames, set up password‑less SSH, upgrade the kernel, disable firewalls and swap, tune sysctl, add Docker and Kubernetes repositories, install Docker, install kubeadm/kubelet/kubectl, configure HAProxy and Keepalived for a virtual IP, join master and worker nodes, deploy a flannel network plugin, and finally verify the cluster with an nginx pod and the Kubernetes dashboard.
This comprehensive tutorial walks you through preparing three CentOS 7.5 machines, disabling firewalls and swap, installing Docker and Kubernetes components with yum repositories, configuring the master node, joining worker nodes, deploying Flannel networking, setting up the Kubernetes dashboard, and troubleshooting common issues.
This article explains why Kubernetes requires an overlay network, describes Docker’s virtual bridge limitations, introduces Flannel’s architecture and its three data‑forwarding modes—UDP, VXLAN, and host‑gw—detailing their mechanisms, performance trade‑offs, and how the StarRing TCOS platform leverages these modes for different cluster sizes and network topologies.
This article explains Docker’s four network drivers (bridge, host, none, overlay), details how the bridge driver creates the docker0 bridge and veth pairs, shows port‑mapping with -p/-P, then covers Kubernetes pod communication patterns, CNI plugins, and provides a step‑by‑step guide to deploying and configuring Flannel with different backends such as vxlan, host‑gw and directrouting.
This article explains Docker's built‑in network drivers, the bridge mode construction and external access, then compares Kubernetes networking requirements and details how Flannel implements pod‑to‑pod communication using overlay networks and packet encapsulation.
This guide walks through three fundamental methods for managing Kubernetes core resources—imperative CLI commands, declarative manifest files, and GUI dashboards—covering namespaces, deployments, services, and addons like Flannel, CoreDNS, Traefik, and the Kubernetes dashboard, with detailed commands, configuration examples, and troubleshooting tips.
This article explains the evolution of Kubernetes networking, detailing how container networks originated with Docker, how Kubernetes assigns each Pod a unique IP, the Flannel host‑gw routing model, and the inner workings of Services, including LVS‑based implementations and the four Service types.
This study evaluates Kubernetes container networking options—Docker host networking, Flannel, IPvlan, VXLAN, host‑gw, and AWS‑VPC—by measuring latency, throughput, and installation cost under high‑load conditions, revealing IPvlan as the lowest‑latency, highest‑throughput solution while host‑gw offers a balanced, low‑dependency alternative.
This article details the step‑by‑step evolution of Mafengwo's Kubernetes network—from early Flannel VXLAN setups, through a VPN‑server bridge for external access, to a MAC‑VLAN CNI solution—highlighting design principles, challenges, and recent optimization plans for large‑scale Java micro‑services.
This tutorial walks you through preparing a CentOS system, installing Docker CE, configuring Docker mirrors, setting up kubelet, kubeadm and kubectl packages, adjusting cgroup settings, initializing a Kubernetes master node, joining worker nodes, deploying Flannel networking, and troubleshooting common issues, all with exact command examples.
This article explains Alibaba Cloud Kubernetes cluster networking, detailing the flannel‑based implementation, the three‑level configuration (cluster, node, pod), the role of Cloud Controller Manager, virtual bridge cni0, and how pods achieve local, intra‑node, inter‑node, and external communication.
This guide provides a comprehensive, command‑by‑command procedure for preparing a CentOS system, installing Docker and Kubernetes components, configuring networking and security settings, and deploying both master and worker nodes along with the Kubernetes Dashboard.
This tutorial walks you through preparing the environment, downloading required packages and images via domestic mirrors, configuring Docker and the network, installing Kubernetes 1.6 with kubeadm, and deploying Flannel and the Dashboard, all tailored for Chinese cloud providers.
This guide walks you through installing a Kubernetes (K8S) cluster on CentOS 7.3 in China, covering environment preparation, downloading required packages and images via local mirrors, configuring Docker and the network, initializing the master node with kubeadm, joining worker nodes, and optionally deploying the dashboard and flannel network plugin.
This tutorial walks through installing net‑tools on CentOS, disabling firewalld, setting up Docker CE, pulling and tagging required Kubernetes images, configuring kubelet and kubeadm, initializing a master node, joining worker nodes, installing Flannel networking, and troubleshooting common kubectl issues.
This article walks you through deploying Flannel (host‑gw and VXLAN modes) and Calico (IP‑IP mode, RR deployment, and BGP configuration) on a Kubernetes cluster using systemd units, etcd backend settings, and detailed CNI configuration files, complete with troubleshooting tips and code snippets.
This article explains how Docker containers are managed within Kubernetes clusters using the Flannel component, detailing its interaction with etcd to allocate unique subnet ranges for each minion node, configuring flanneld, and troubleshooting common networking issues.
This article reviews six Docker networking projects—Libnetwork, Pipework, Socketplane, Weave, Flannel, and Tinc—explaining their architectures, key concepts, and how they extend Docker's native networking to meet security and advanced functionality requirements.
This guide walks through constructing a Kubernetes master high‑availability environment on a private‑cloud Ubuntu 14.04 platform, covering full component containerization, external load‑balancer setup with HAProxy and Keepalived, static pod configuration, privileged mode requirements, flannel networking, common pitfalls, and future HA master developments.
