flannel-io/flannel resource

Health v2 · maintenance only

Adoption not part of the score

9523 stars · 2886 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Flannel is a simple layer 3 network fabric for containers, designed primarily for Kubernetes. It runs a small agent (flanneld) on each host to allocate subnet leases and forwards pod traffic between nodes using backends like VXLAN, providing a CNI plugin for Kubernetes.

Use cases

• set up pod networking in a Kubernetes cluster
• provide a CNI plugin for container networking
• configure an overlay network with VXLAN between hosts
• give each container a unique routable IP across nodes
• network a lightweight cluster like K3s
• replace complex port mapping with routable pod IPs

When to choose

• you want a simple, easy-to-operate Kubernetes network fabric
• you run K3s or a distribution that defaults to flannel
• you need basic pod-to-pod connectivity without heavy features
• you prefer a single small binary agent per host

When to avoid

• you need built-in network policy enforcement (flannel requires external controllers like Calico or Cilium)
• you need advanced features like eBPF dataplane, service mesh, or encryption
• you need IPv6-only networking as your primary requirement
• you want a feature-rich CNI with extensive traffic control

Facets

infra-config · maturity stable

networking container-orchestration deployment networking cloud-computing go cloud cni-plugin overlay-network vxlan kubernetes-networking subnet-allocation pod-networking containers devops linux kubernetes docker

Member repositories

For agents

markdown · JSON · MCP: product_card(name="flannel-io/flannel")