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Add AppArmor feature gate
Add option to disable AppArmor via a feature gate. This PR treats AppArmor as Beta, and thus depends on https://github.com/kubernetes/kubernetes/pull/31471 (I will remove `do-not-merge` once that merges).
Note that disabling AppArmor means that pods with AppArmor annotations will be rejected in validation. It does not mean that the components act as though AppArmor was never implemented. This is by design, because we want to make it difficult to accidentally run a Pod with an AppArmor annotation without AppArmor protection.
/cc @dchen1107
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Fix hang/websocket timeout when streaming container log with no content
When streaming and following a container log, no response headers are sent from the kubelet `containerLogs` endpoint until the first byte of content is written to the log. This propagates back to the API server, which also will not send response headers until it gets response headers from the kubelet. That includes upgrade headers, which means a websocket connection upgrade is not performed and can time out.
To recreate, create a busybox pod that runs `/bin/sh -c 'sleep 30 && echo foo && sleep 10'`
As soon as the pod starts, query the kubelet API:
```
curl -N -k -v 'https://<node>:10250/containerLogs/<ns>/<pod>/<container>?follow=true&limitBytes=100'
```
or the master API:
```
curl -N -k -v 'http://<master>:8080/api/v1/<ns>/pods/<pod>/log?follow=true&limitBytes=100'
```
In both cases, notice that the response headers are not sent until the first byte of log content is available.
This PR:
* does a 0-byte write prior to handing off to the container runtime stream copy. That commits the response header, even if the subsequent copy blocks waiting for the first byte of content from the log.
* fixes a bug with the "ping" frame sent to websocket streams, which was not respecting the requested protocol (it was sending a binary frame to a websocket that requested a base64 text protocol)
* fixes a bug in the limitwriter, which was not propagating 0-length writes, even before the writer's limit was reached
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Improve godoc for goroutinemap
Improves the godoc of goroutinemap; found while preparing to use this type in another PR.
@saad-ali
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Fixed integer overflow bug in rate limiter.
```release-note
Fix overflow issue in controller-manager rate limiter
```
This PR fixes a bug in the delayed work-queue used by some controllers.
The integer overflow bug would previously cause hotlooping behavior after a few failures
as `time.Duration(..)` on values larger than MaxInt64 behaves unpredictably, and
after a certain value returns 0 always.
cc @bprashanth @pwittrock
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Revert revert 30090 with fix
This reverts #31297 (which originally reverted #30090) and applies a fix to stop the fd leak that was exposed by #30090.
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Avoid sorting lists when unnecessary
I've seen ThreadSafeMap::List consuming ~30% of whole CPU usage, spending the whole time in sorting (while it is in fact completely unneded).
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Add kubelet --network-plugin-mtu flag for MTU selection
* Add network-plugin-mtu option which lets us pass down a MTU to a network provider (currently processed by kubenet)
* Add a test, and thus make sysctl testable
Automatic merge from submit-queue
[Kubelet] Optionally consume configuration from <node-name> named config maps
This extends the Kubelet to check the API server for new node-specific config, and exit when it finds said new config.
/cc @kubernetes/sig-node @mikedanese @timstclair @vishh
**Release note**:
```
Extends Kubelet with Alpha Dynamic Kubelet Configuration. Please note that this alpha feature does not currently work with cloud provider auto-detection.
```
Automatic merge from submit-queue
Unset https_proxy before roundtripper_test
When running `hack/test-go.sh`, if the testing env is behind a https proxy, roundtripper_test will fail randomly.
After `unset https_proxy`, the testing works well. So, add a comment to be a troubleshooting tip.
Fail info:
```
--- FAIL: TestRoundTripAndNewConnection (0.12s)
roundtripper_test.go:319: proxied http->http: shouldError=false, got true: Get http://127.0.0.1:46711: unexpected EOF
FAIL
FAIL k8s.io/kubernetes/pkg/util/httpstream/spdy 0.148s
```
```
--- FAIL: TestRoundTripAndNewConnection (0.12s)
roundtripper_test.go:319: proxied https with auth (valid hostname + RootCAs) -> http: shouldError=false, got true: Get http://127.0.0.1:41028: unexpected EOF
FAIL
FAIL k8s.io/kubernetes/pkg/util/httpstream/spdy 0.146s
```
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Make 'allAlpha' a special feature gate
Rather than making all caller check both allAlpha and their own flag, make `allAlpha` set all of the alpha gates explicitly.
This is hard to test because of the globalness. I will follow this commit with a new one to add some way to test, but I wanted to float this design
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Implement TLS bootstrap for kubelet using `--experimental-bootstrap-kubeconfig` (2nd take)
Ref kubernetes/features#43 (comment)
cc @gtank @philips @mikedanese @aaronlevy @liggitt @deads2k @errordeveloper @justinsb
Continue on the older PR https://github.com/kubernetes/kubernetes/pull/30094 as there are too many comments on that one and it's not loadable now.
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Fixes#30886
This PR fixes https://github.com/kubernetes/kubernetes/issues/30886
```
make WHAT=pkg/kubelet
+++ [0818 17:03:21] Generating bindata:
/Users/jscheuermann/inovex/workspace/kubernetes-clone/test/e2e/framework/gobindata_util.go
+++ [0818 17:03:22] Building the toolchain targets:
k8s.io/kubernetes/hack/cmd/teststale
+++ [0818 17:03:22] Building go targets for darwin/amd64:
pkg/kubelet
```
Add --bootstrap-kubeconfig flag to kubelet. If the flag is non-empty
and --kubeconfig doesn't exist, then the kubelet will use the bootstrap
kubeconfig to create rest client and generate certificate signing request
to request a client cert from API server.
Once succeeds, the result cert will be written down to
--cert-dir/kubelet-client.crt, and the kubeconfig will be populated with
certfile, keyfile path pointing to the result certificate file, key file.
(The key file is generated before creating the CSR).
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Add annotations to the PodSecurityPolicy Provider interface
@pweil- is this what you were thinking in terms of API changes? I really like to avoid functions with more than 2 return values, but couldn't think of a cleaner approach in this case.
