Network add-ons

https://github.com/containernetworking

• flannel
• cilium
• calico
• vpc-cni (aws)
• kube-router
• weavenet
• antrea
• romana

cilium

https://github.com/cilium/cilium

Flannel

flannel是k8s最常用的网络插件.

https://github.com/coreos/flannel

在所有node上部署cni-plugin:

https://github.com/containernetworking/plugins/releases

$ sudo mkdir -p /opt/cni/bin
// 下载并解压所有插件命令到该目录.

network-addon(master上操作即可):

$ kubectl apply -f https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml

veryfy:

$ kubectl get nodes
$ kubectl get pod --all-namespaces

删除插件:

删除插件会影响已经部署的pod.

// 删除flannel 
$ kubectl delete -f X.yml  
$ sudo systemctl stop kubelet docker

// 第二步，在node节点清理flannel网络留下的文件
ifconfig cni0 down
ip link delete cni0 
ifconfig flannel.1 down
ip link delete flannel.1 
rm -rf /var/lib/cni /etc/cni /run/flannel
$ sudo rm -rf /var/lib/kubelet /var/lib/etcd

// 重启kubelet
$ sudo systemctl start kubelet docker

修改配置:

/etc/kube-flannel/net-conf.json

{
  "Network": "10.244.0.0/16",
  "SubnetLen": 24,
  "SubnetMin": "10.244.0.0",
  "SubnetMax": "10.244.255.0",
  "Backend": {
    "Type": "vxlan"
  }
}

使用kubeadm：

kubeadm init必须指定flannel的Network参数:

--pod-network-cidr=10.244.0.0/16

如果需要修改其它参数，同时需要修改kubeadm的配置