Automatic merge from submit-queue
Add test for kube-proxy running with "--cleanup-iptables=true"
**What this PR does / why we need it**:
Add test to prevent such kube-proxy panic to happen again.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#48177
**Special notes for your reviewer**:
Forgot to add this in last PR #48183. Should we also add this to v1.7 milestone?
/cc @ncdc @dchen1107
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 49992, 48861, 49267, 49356, 49886)
Emit event and retry when fail to start healthz server on kube-proxy
**What this PR does / why we need it**: Enhance kube-proxy's logic when fail to start healthz server.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: From #49263.
**Special notes for your reviewer**:
/assign @thockin @nicksardo @bowei
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 49058, 49072, 49137, 49182, 49045)
check for nil value in interface for proxier health
golang allows for a non-nil interface to have a nil value (not type). This results in an NPE at runtime.
@sttts remember that bit about go? Trivia becomes real :(
Automatic merge from submit-queue (batch tested with PRs 48043, 48200, 49139, 36238, 49130)
expose method to allow externally setting defaults on an external type
The options are an exposed type. This allows you to set the defaults on them.
@derekwaynecarr who normally owns this bit?
Automatic merge from submit-queue (batch tested with PRs 47309, 47187)
Add IPv6 test cases to kube-proxy server test.
**What this PR does / why we need it**: This change adds some IPv6 test cases for the kube-proxy server. Also adds some test cases for negative conditions for better test coverage.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#47313
**Special notes for your reviewer**:
**Release note**:
```release-note
```
Automatic merge from submit-queue
fix#46039: iptables proxier need use '--bind-address' if set
**What this PR does / why we need it**:
iptables proxier need use '--bind-address' if set
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#46039
**Special notes for your reviewer**:
**Release note**:
```release-note
```
change import of client-go/api/helper to kubernetes/api/helper
remove unnecessary use of client-go/api.registry
change use of client-go/pkg/util to kubernetes/pkg/util
remove dependency on client-go/pkg/apis/extensions
remove unnecessary invocation of k8s.io/client-go/extension/intsall
change use of k8s.io/client-go/pkg/apis/authentication to v1
Automatic merge from submit-queue (batch tested with PRs 44727, 45409, 44968, 45122, 45493)
Separate healthz server from metrics server in kube-proxy
From #14661, proposal is on kubernetes/community#552.
Couple bullet points as in commit:
- /healthz will be served on 0.0.0.0:10256 by default.
- /metrics and /proxyMode will be served on port 10249 as before.
- Healthz handler will verify timestamp in iptables mode.
/assign @nicksardo @bowei @thockin
**Release note**:
```release-note
NONE
```
- /healthz will be served on 0.0.0.0:10256 by default.
- /metrics and /proxyMode will be served on port 10249
as before.
- Healthz handler will verify timestamp in iptables mode.
Automatic merge from submit-queue
[WIP] Skip resize of nf_conntrack/parameters/hashsize if not necessary
**What this PR does / why we need it**:
Linux does not support writing to `/sys/module/nf_conntrack/parameters/hashsize` when the writer process is not in the initial network namespace
(https://github.com/torvalds/linux/blob/v4.10/net/netfilter/nf_conntrack_core.c#L1795-L1796).
Usually that's fine. But in some configurations such as with https://github.com/kinvolk/kubeadm-nspawn, kube-proxy is in another netns.
Therefore, check if writing in hashsize is necessary and skip the writing if not.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
```
Automatic merge from submit-queue
Optimize getProxyMode() to get proxy mode
1. getProxyMode() does not need nodeGetter args after remove
proxy-mode annotation.
2. we should get error when the version of iptables less than
MinVersion.
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