Kubernetes networking

https://kubernetes.io/docs/concepts/cluster-administration/networking/

The Container Network Interface (CNI) plugin is selected by passing kubelet the --network-plugin=cni

• CoreDNS
• Calico
• Flannel
• Cilium
• Multus CNI
• Kubernetes ExternalDNS

• kubectl proxy
• kubectl port-forward

Activities

• Create a pod network: kubeadm init --pod-network-cidr=10.244.0.0/16
• Understand host networking configuration on the cluster nodes (CKA v1.23, CKA v1.24, CKA v1.25)
• Understand connectivity between Pods (CKA v1.23, CKA v1.24, CKA v1.25)
• Know how to configure and use CoreDNS (CKA v1.23, CKA v1.24, CKA v1.25)
• CKA: Troubleshoot networking
• CKA: Choose an appropriate container network interface plugin
• Read https://kubernetes.io/blog/2022/05/23/service-ip-dynamic-and-static-allocation/
• Exposing an External IP Address to Access an Application in a Cluster: kubectl expose deployment

Related terms

• Network policies
• AWS EKS Addons: vpc-cni

• kind: NetworkPolicy
• Service mesh

See also

• Kubernetes networking: network policies, Network Policy Providers, CNI, Calico, flannel, Service mesh, Istio, kube-proxy, coredns, AWS VPC CNI: vpc-cni, Kubernetes: Ingress controllers, IPVS, ServiceTypes: LoadBalancer, ClusterIP, NodePort, ExternalName, Endpoints, EndpointSlices, Kubernetes DNS, svc.cluster.local, Weave Net