pikeszfish / simplest-cni

simplest CNI implementation ever without any distributed stores

Simplest CNI (最简单的 CNI)

As I was inspired by the article 也许您的Kubernetes集群并不需要SDN, I found k8s CNI can just use the pod CIDR auto-allocated by the kube-controller-manager for each node with host-local from containernetworking/plugins rather than other IPAM plugins which use distributed stores(i.e etcd) like in Calico or flannel.

Feature

• CNI 0.3.0
• auto rotate config as ConfigMap changed

Required

As simplest-CNI uses pod CIDR auto-allocated by the kube-controller-manager, some options are required to be added. --allocate-node-cidrs=true and --cidr-allocator-type=RangeAllocator are required to auto-allocate pod CIDR for each node. --allocate-node-cidrs and --node-cidr-mask-size can be modified to suit your environment.

--allocate-node-cidrs          Should CIDRs for Pods be allocated and set on the cloud provider.
--cidr-allocator-type string   Type of CIDR allocator to use (default "RangeAllocator")
--cluster-cidr string          CIDR Range for Pods in cluster. Requires --allocate-node-cidrs to be true
--node-cidr-mask-size int32    Mask size for node cidr in cluster. (default 24)

Installation

kubectl apply -f https://raw.githubusercontent.com/pikeszfish/simplest-cni/master/k8s/simplest-cni.yml

Build

docker build -t pikeszfish/simplest-cni:v0.1.0 .

Reference

• 也许您的Kubernetes集群并不需要SDN
• kubeup/hostroutes
• install-cni.sh from projectcalico/cni-plugin
• kube-controller-manager

License

simplest-cni is available under the GNU General Public License v3.0. See the LICENSE file for details.