doc(kubeadm.md): update and format

docs/kubeadm.md

@@ -1,43 +1,58 @@
 # Deploying kube-router with kubeadm
 
-Please follow the [steps](https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/) to install Kubernetes cluster with Kubeadm, however must specify `--pod-network-cidr` when you run `kubeadm init`.
+Please follow the [steps](https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/) to install Kubernetes
+cluster with Kubeadm, however must specify `--pod-network-cidr` when you run `kubeadm init`.
 
-Kube-router relies on kube-controller-manager to allocate pod CIDR for the nodes.
+kube-router relies on kube-controller-manager to allocate pod CIDR for the nodes.
 
-Kube-router provides pod networking, network policy and high perfoming IPVS/LVS based service proxy. Depending on you choose to use kube-router for service proxy you have two options.
+kube-router provides pod networking, network policy and high perfoming IPVS/LVS based service proxy. Depending on your
+choice to use kube-router for service proxy you have two options.
 
-## kube-router providing pod networking and network policy
+## kube-router Providing Pod Networking and Network Policy
 
-For the step #3 **Installing a pod network** install a kube-router pod network and network policy add-on with the following command (Kubernetes version should be at least 1.8):
+For the step #3 **Installing a Pod network add-on** install a kube-router pod network and network policy add-on with the
+following command:
 
 ```sh
 KUBECONFIG=/etc/kubernetes/admin.conf kubectl apply -f https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/kubeadm-kuberouter.yaml
 ```
 
-## kube-router providing service proxy, firewall and pod networking.
+## kube-router Providing Service Proxy, Firewall and Pod Networking
 
-For the step #3 **Installing a pod network** install a kube-router pod network and network policy add-on with the following command (Kubernetes version should be at least 1.8):
+For the step #3 **Installing a Pod network add-on** install a kube-router pod network and network policy add-on with the
+following command:
 
 ```sh
 KUBECONFIG=/etc/kubernetes/admin.conf kubectl apply -f https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/kubeadm-kuberouter-all-features.yaml
 ```
 
-Now since kube-router provides service proxy as well. Run below commands to remove kube-proxy and cleanup any iptables configuration it may have done.
+Now since kube-router provides service proxy as well. Run below commands to remove kube-proxy and cleanup any iptables
+configuration it may have done.
 
 ```sh
 KUBECONFIG=/etc/kubernetes/admin.conf kubectl -n kube-system delete ds kube-proxy
 ```
 
-To cleanup kube-proxy we can do this with docker or containerd:
+To cleanup kube-proxy we can do this with docker, containerd, or cri-o:
+
+### docker
 
-docker:
 ```sh
-docker run --privileged -v /lib/modules:/lib/modules --net=host k8s.gcr.io/kube-proxy-amd64:v1.23.4 kube-proxy --cleanup
+docker run --privileged -v /lib/modules:/lib/modules --net=host registry.k8s.io/kube-proxy-amd64:v1.28.2 kube-proxy --cleanup
 ```
 
-containerd:
+### containerd
+
 ```sh
-ctr images pull k8s.gcr.io/kube-proxy-amd64:v1.23.4
+ctr images pull k8s.gcr.io/kube-proxy-amd64:v1.28.2
 ctr run --rm --privileged --net-host --mount type=bind,src=/lib/modules,dst=/lib/modules,options=rbind:ro \
-    k8s.gcr.io/kube-proxy-amd64:v1.23.4 kube-proxy-cleanup kube-proxy --cleanup
-```
+    registry.k8s.io/kube-proxy-amd64:v1.28.2 kube-proxy-cleanup kube-proxy --cleanup
+```
+
+### cri-o
+
+```sh
+crictl pull registry.k8s.io/kube-proxy-amd64:v1.28.2
+crictl run --rm --privileged --net-host --mount type=bind,src=/lib/modules,dst=/lib/modules,options=rbind:ro
+    registry.k8s.io/kube-proxy-amd64:v1.28.2 kube-proxy-cleanup kube-proxy --cleanup
+```