Automatic merge from submit-queue
Switch from package syscall to golang.org/x/sys/unix
**What this PR does / why we need it**:
The syscall package is locked down and the comment in https://github.com/golang/go/blob/master/src/syscall/syscall.go#L21-L24 advises to switch code to use the corresponding package from golang.org/x/sys. This PR does so and replaces usage of package syscall with package golang.org/x/sys/unix where applicable. This will also allow to get updates and fixes
without having to use a new go version.
In order to get the latest functionality, golang.org/x/sys/ is re-vendored. This also allows to use Eventfd() from this package instead of calling the eventfd() C function.
**Special notes for your reviewer**:
This follows previous works in other Go projects, see e.g. moby/moby#33399, cilium/cilium#588
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue
Log abridged set of rules at v2 in kube-proxy on error
**What this PR does / why we need it**:
this is a follow-on to https://github.com/kubernetes/kubernetes/pull/48085
**Special notes for your reviewer**:
we hit this in operations where we typically run in v2, and would like to log abridged set of output rather than full output.
**Release note**:
```release-note
NONE
```
The syscall package is locked down and the comment in [1] advises to
switch code to use the corresponding package from golang.org/x/sys. Do
so and replace usage of package syscall with package
golang.org/x/sys/unix where applicable.
[1] https://github.com/golang/go/blob/master/src/syscall/syscall.go#L21-L24
This will also allow to get updates and fixes for syscall wrappers
without having to use a new go version.
Errno, Signal and SysProcAttr aren't changed as they haven't been
implemented in /x/sys/. Stat_t from syscall is used if standard library
packages (e.g. os) require it. syscall.SIGTERM is used for
cross-platform files.
Automatic merge from submit-queue (batch tested with PRs 47232, 48625, 48613, 48567, 39173)
proxy/userspace: honor listen IP address as host IP if given
Allows the proxier to be used on an interface that's not the default route,
otherwise hostIP gets set to the default route interface even if that's
not what the user intended.
If listen IP isn't given, falls back to previous behavior.
```release-note
To allow the userspace proxy to work correctly on multi-interface hosts when using the non-default-route interface, you may now set the `bindAddress` configuration option to an IP address assigned to a network interface. The proxy will use that IP address for any required NAT operations instead of the IP address of the interface which has the default route.
```
@kubernetes/sig-network-misc @thockin @wojtek-t
Allows the proxier to be used on an interface that's not the default route,
otherwise hostIP gets set to the default route interface even if that's
not what the user intended.
If listen IP isn't given, falls back to previous behavior.
Automatic merge from submit-queue
Raise a warning instead of info if br-netfilter is missing or unset
Took quite a while to figure out why service VIP is unreachable on my cluster. It turns out br-nf-call-iptables is unset. I wish this message could be a warning to attract considerable attention.
Automatic merge from submit-queue
Move the remaining controllers to shared informers
Completes work done in 1.6 to move the last two hold outs to shared informers - tokens controller and scheduler. Adds a few more tools to allow informer reuse (like filtering the informer, or maintaining a mutation cache).
The mutation cache is identical to #45838 and will be removed when that merges
@ncdc @deads2k extracted from openshift/origin#14086
Automatic merge from submit-queue
Fix the issue in Windows kube-proxy when processing unqualified name. This is for DNS client such as ping or iwr that validate name in response and original question.
**What this PR does / why we need it**:
This PR is an additional fix to #41618 and [the corresponding commit](b9dfb69dd7). The DNS client such as nslookup does not validate name matching in response and original question. That works fine when we append DNS suffix to unqualified name in DNS query in Windows kube-proxy. However, for DNS client such as ping or Invoke-WebRequest that validates name in response and original question, the issue arises and the DNS query fails although the received DNS response has no error.
This PR fixes the additional issue by restoring the original question name in DNS response. Further, this PR refactors DNS message routines by using miekg's DNS library.
This PR affects the Windows kube-proxy only.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#42605
**Special notes for your reviewer**:
**Release note**:
```release-note
Fix DNS suffix search list support in Windows kube-proxy.
```
Automatic merge from submit-queue (batch tested with PRs 45953, 45889)
Add /metrics and profiling handlers to kube-proxy
Also expose "syncProxyRules latency" as a prometheus metrics.
Fix https://github.com/kubernetes/kubernetes/issues/45876
