Flannel CNI¶

Flannel is a network fabric designed for Kubernetes that functions as a Container Network Interface (CNI) backend^[400-devops-06-kubernetes-minikube-01-install.md]. Its primary role is to handle the networking layer, allowing pods to communicate with one another across different nodes within a cluster^[400-devops-06-kubernetes-minikube-01-install.md].

Configuration¶

Flannel is typically configured during the initialization of a cluster. For example, when using tools like Minikube, Flannel can be specified as the CNI plugin using the --cni=flannel flag^[400-devops-06-kubernetes-minikube-01-install.md].

Deployment Process¶

When a Kubernetes node initializes, the system actively sets up the network layer using Flannel^[400-devops-06-kubernetes-minikube-01-install.md]. This configuration phase is explicitly logged as "Configuring Flannel (Container Networking Interface)" during the startup sequence^[400-devops-06-kubernetes-minikube-01-install.md].

Once configured, the network fabric allows the cluster to finish booting the control plane and verifying components^[400-devops-06-kubernetes-minikube-01-install.md].

Sources¶

^[400-devops-06-kubernetes-minikube-01-install.md]