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Merge pull request #56036 from m1093782566/flush-ipvs
Automatic merge from submit-queue (batch tested with PRs 55103, 56036, 56186). 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 cleanup-ipvs flag for kube-proxy 

**What this PR does / why we need it**:

There is no way to tell if a given ipvs rule is created by ipvs proxier or not, and some people have complained that iptables/userspace proxier will clean up their ipvs rules when start up - both iptables and userspace proxiers need to clean up legacy proxy rules created by ipvs proxier.

This PR adds a new `--cleanup-ipvs` flag for kube-proxy for the sake of providing users a way to decide if clean up IPVS rules or not when start iptables or userspace proxier.

**Which issue(s) this PR fixes**:
Fixes #55857 

**Special notes for your reviewer**:

**Release note**:

```release-note
Add cleanup-ipvs flag for kube-proxy 
```

/sig network
/area ipvs
/king bug
2017-11-22 00:27:30 -08:00
.github Merge pull request #54114 from xiangpengzhao/fix-pr-template 2017-10-30 18:37:06 -07:00
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