Merge pull request #54976 from m1093782566/ipvs-kubeadm

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Add kubeadm way in ipvs proxy README **What this PR does / why we need it**: As #53962 which support specify proxy mode for kubeadm is already in, we should add ipvs proxy kubeadm way in README.md. **Which issue(s) this PR fixes**: Fixes #54978 **Special notes for your reviewer**: **Release note**: ```release-note NONE ```

Merge pull request #54976 from m1093782566/ipvs-kubeadm
1fc64162 · Kubernetes Submit Queue · GitHub · 0575f728 · 4ac7edb2 · 1fc64162
Unverified Commit 1fc64162 authored Nov 02, 2017 by Kubernetes Submit Queue Committed by GitHub Nov 02, 2017
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README.md pkg/proxy/ipvs/README.md +11 -2

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--- a/pkg/proxy/ipvs/README.md
+++ b/pkg/proxy/ipvs/README.md
@@ -35,7 +35,17 @@ Kube-proxy will run in iptables mode by default in a [local-up cluster](https://
 Users should export the env `KUBEPROXY_MODE=ipvs` to specify the ipvs mode before deploying the cluster if want to run kube-proxy in ipvs mode.
-// TODO: Kubeadm
+#### Cluster Created by Kubeadm
+Kube-proxy will run in iptables mode by default in a cluster deployed by [kubeadm](https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/). 
+Since IPVS mode is still feature-gated, users should add the flag `--feature-gates=SupportIPVSProxyMode=true` in `kubeadm init` command
+```
+kubeadm init --feature-gates=SupportIPVSProxyMode=true
+```
+to specify the ipvs mode before deploying the cluster if want to run kube-proxy in ipvs mode.
 #### Test
@@ -51,4 +61,3 @@ TCP  10.0.0.1:443 rr persistent 10800
 TCP  10.0.0.10:53 rr      
 UDP  10.0.0.10:53 rr
 ```