Pack Information
Flannel
Flannel is a simple and easy way to configure a layer 3 network fabric designed for Kubernetes.
How it works
Flannel runs a small, single binary agent called flanneld on each host, and is responsible for allocating a subnet lease to each host out of a larger, preconfigured address space.
Flannel uses either the Kubernetes API or etcd directly to store the network configuration, the allocated subnets, and any auxiliary data (such as the host's public IP).
Packets are forwarded using one of several backend mechanisms including VXLAN and various cloud integrations.
Prerequisites
Kubernetes 1.22 and higher are supported.
Below cloud types are supported.
- AWS,
- Vsphere,
- GCP,
- MaaS,
- Edge-native
Upgrade
Upgrade from 0.21.4 and below versions to 0.22.0 and above versions has been blocked. 0.21.4 and below versions use manifest based installation and the newer versions use helm charts, which are not compatible for upgrades.
Parameters
| Parameter | Description | Type | Default Value | Required |
|---|---|---|---|---|
| charts.flannel.podCidr | This should match the pod CIDR in k8s pack | string | 192.168.0.0/16 | Yes |
| charts.flannel.flannel.cniPluginsImage | Core CNI Plugins Image needed for edge clusters and k3s. | string | gcr.io/spectro-images-public/packs/flannel/0.25.5/cni-plugins:v1.5.1 | Yes |
| charts.flannel.flannel.image | kube-flannel image | object | gcr.io/spectro-images-public/packs/flannel/0.25.5/flannel:0.25.5 | Yes |
| charts.flannel.flannel.cniImage | CNI image | object | gcr.io/spectro-images-public/packs/flannel/0.25.5/flannel-cni-plugin:v1.5.1 | Yes |
| charts.flannel.flannel.backend | Backend for kube-flannel. Backend should not be changed at runtime (vxlan, host-gw, wireguard, udp) | string | vxlan | Yes |