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>.
Need to validate taint effect when removing taints.
Instead of reporting taint not found, it's better to report user
that the effect is invalid. This will help user to check errors.
So when user tries to remove a taint, two conditions will be checked:
1. Whether or not the effect is an empty string.
2. Whether or not the non-empty effect is a valid taint effect.
**Release note**:
```release-note
None
```
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>.
Fix duplicate unbind action in kube-proxy
**What this PR does / why we need it**:
Fix duplicate unbind action in kube-proxy. It will generate unnecessary error info If unbind multi-ports on one service .
**Which issue this PR fixes**:
fixes#51694
**Release-note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 52520, 52033, 53626, 50478). 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>.
Fix kube-proxy to use proper iptables commands for IPv6 operation
For iptables save and restore operations, kube-proxy currently uses
the IPv4 versions of the iptables save and restore utilities
(iptables-save and iptables-restore, respectively). For IPv6 operation,
the IPv6 versions of these utilities need to be used
(ip6tables-save and ip6tables-restore, respectively).
Both this change and PR #48551 are needed to get Kubernetes services
to work in an IPv6-only Kubernetes cluster (along with setting
'--bind-address ::0' on the kube-proxy command line. This change
was alluded to in a discussion on services for issue #1443.
fixes#50474
**What this PR does / why we need it**:
This change modifies kube-proxy so that it uses the proper commands for iptables save and
iptables restore for IPv6 operation. Currently kube-proxy uses 'iptables-save' and 'iptables-restore'
regardless of whether it is being used in IPv4 or IPv6 mode. This change fixes kube-proxy so
that it uses 'ip6tables-save' and 'ip6tables-restore' commands when kube-proxy is being run
in IPv6 mode.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#50474
**Special notes for your reviewer**:
**Release note**:
```release-note NONE
```
Automatic merge from submit-queue (batch tested with PRs 53525, 53652). 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>.
apimachinery: remove ObjectCopier interface(s)
The big commit is a mechanical, transitive removal of the copier interfaces in all structs and function calls.
Automatic merge from submit-queue (batch tested with PRs 53444, 52067, 53571, 53182). 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>.
Return an error if metric cannot be registered
**What this PR does / why we need it**:
`prometheus.MustRegister` panics if a metric cannot be registered. This PR replaces it with `prometheus.Register`, as it does not panic, and returns the error if the metric cannot be registered.
I also adds lacking tests for `RegisterMetricAndTrackRateLimiterUsage`.
**Which issue this PR fixes**:
Fixes#52872
**Special notes for your reviewer**:
None of the `metrics.RegisterMetricAndTrackRateLimiterUsage` invocations check the returned error, so I plan to submit new PRs to address this.
**Release note**:
```release-note
NONE
```
/sig instrumentation
`prometheus.MustRegister` panics if the metric cannot be registered.
Instead, use `prometheus.Register` and return the error if the metric
cannot be registered.
Also, add tests for `RegisterMetricAndTrackRateLimiterUsage`.
Signed-off-by: Ferran Rodenas <frodenas@gmail.com>
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>.
Refactor nsenter
**What this PR does / why we need it**:
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#51273
**Special notes for your reviewer**:
/assign @jsafrane
**Release note**:
```release-note
None
```
Automatic merge from submit-queue (batch tested with PRs 52768, 51898, 53510, 53097, 53058). 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>.
Fix version comparison for versions with preRelease components
**What this PR does / why we need it**:
Fixes algorithm of comparing versions in pkg/util/version.
Also improve unit testing, so reverse comparison of versions also works
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#53055
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 53418, 53366, 53115, 53402, 53130). 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>.
Implement delete real server for fakeIPVS and add UTs
**What this PR does / why we need it**:
* Implement DeleteRealServer() for FakeIPVS because ipvs/proxier needs it.
* Add UTs - Since there are some real logics in fakeIPVS interface, it's important to add some UTs which can help avoiding some mistakes. Sadly, there is already a bug :(
**Which issue this PR fixes**:
fixes#53137
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 53227, 53120). 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>.
remove ipv4 in pkg/util/ipvs
**What this PR does / why we need it**:
remove ipv4 in util/ipvs
**Which issue this PR fixes**:
xref: #51866
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 53454, 53446, 52935, 53443, 52917). 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>.
Remove ipv4 constraint of Node IPs in ipvs proxier
**What this PR does / why we need it**:
We are targeting to IPV6. So, we should remove ipv4 constraint of Node IPs in ipvs proxier.
Besides, adding some log messages.
**Which issue this PR fixes**:
xref #51866
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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>.
Use `--oom-score-adj` flag for kube-proxy
**What this PR does / why we need it**:
Replace `echo -998 > /proc/$$$/oom_score_adj` with `--oom-score-adj` flag for kube-proxy.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#51083
**Special notes for your reviewer**:
/assign @justinsb @vishh
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 49826, 53404). 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>.
avoid newline "\n" in the error to break log msg to 2 lines
**What this PR does / why we need it**:
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#49813
**Special notes for your reviewer**:
/cc @justinsb @rrati
**Release note**:
```release-note
avoid newline "\n" in the error to break log msg to 2 lines
```
Automatic merge from submit-queue (batch tested with PRs 52721, 53057, 52493, 52998, 52896). 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>.
Fix a potential file leak
Previously, if a write or sync error occurred, we would not have called
Close(). This commit refactors ReplaceFile() so that we are sure to call
Close(), and also attempts to delete the temporary file if errors occur.
See: https://github.com/kubernetes/kubernetes/pull/52119#discussion_r137916659Fixes: #53060
```release-note
NONE
```
@yujuhong @ash2k
Previously, if a write or sync error occurred, we would not have called
Close(). This commit refactors ReplaceFile() so that we are sure to call
Close(), and also attempts to delete the temporary file if errors occur.
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>..
bazel: build/test almost everything
**What this PR does / why we need it**: Miscellaneous cleanups and bug fixes. The main motivating idea here was to make `bazel build //...` and `bazel test //...` mostly work. (There's a few reasons these still don't work, but we're a lot closer.)
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
/assign @BenTheElder @mikedanese @spxtr
Automatic merge from submit-queue (batch tested with PRs 52469, 52574, 52330, 52689, 52829). 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>..
Fix IPVS service Flags
**What this PR does / why we need it**:
**Which issue this PR fixes**:
fixes#52393
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 52469, 52574, 52330, 52689, 52829). 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 feature: azurefile mount on windows node
**What this PR does / why we need it**:
feature: azurefile mount on windows node. I created this new PR, close the original one(https://github.com/kubernetes/kubernetes/pull/50233) as there is a big rebase change.
Currently only SMB(a nfs protocol) is supported for windows container in the new Windows 2016 RS3 image, and windows container in RS3 could only use New-SmbGlobalMapping cmdlet for volume mapping, "net use" command does not work for windows container.
**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**:
As there is a known blocking issue in Windows 2016 server when mounting a SMB(a NFS protocol in Windows) share on a container host and then bind that share to a container ( Azure file on Windows is using SMB protocol), this PR still could not mount an azure file on current windows 2016 server node, it depends on 2016 RS3 release, and it will still succeed (as a workaround) if customer want to mount an azure file on current windows node.
Main code logic is similar to what it does in Linux node:
1. create target directory in Windows host
2. Use New-SmbGlobalMapping powershell cmdlet to mount SMB azure file to a drive in Windows host
3. Use mklink command to link target directory to the mounted drive
K8s would bind target directory to the container directory
source in mount function would be like:
`\\[accountname].file.core.windows.net\test`
target in mount function would be like:
`c:\var\lib\kubelet\pods\5f679f75-7ce3-11e7-b718-000d3a31dac4\volumes\kubernetes.io~azure-file`
sample azure file config file:
```
apiVersion: v1
kind: Pod
metadata:
name: iis
spec:
containers:
- image: microsoft/iis
name: iis
volumeMounts:
- name: azure
mountPath: "d:"
nodeSelector:
beta.kubernetes.io/os: windows
volumes:
- name: azure
azureFile:
secretName: azure-secret
shareName: k8stest
readOnly: false
```
**Release note**:
```release-note
```
Automatic merge from submit-queue (batch tested with PRs 52485, 52443, 52597, 52450, 51971). 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>..
Some kubelet flags do not accept their default values
Correct the flags and add a round trip test that ensure these do not
break again in the future.
@deads2k as observed when we tried to turn flags into args.
Automatic merge from submit-queue (batch tested with PRs 51929, 52015, 51906, 52069, 51542). 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>..
Support IPVS Flush API
**What this PR does / why we need it**:
Currently, we implement IPVS flush API by deleting IPVS services one by one, which is inefficient.
**Which issue this PR fixes**:
fixes#52070
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 43016, 50503, 51281, 51518, 51582). 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>..
double const in mount_linux.go
**What this PR does / why we need it**:
fix some typo and double const
**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
NONE
```
Automatic merge from submit-queue (batch tested with PRs 43016, 50503, 51281, 51518, 51582). 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>..
Clean up diskLooksUnformatted literal
**What this PR does / why we need it**:
#16948 moved the `formatAndMount` function to mount_linux.go, but `diskLooksUnformatted` does not necessarily need to appear in mount_unsupported.go
#31515 Renames `diskLooksUnformatted` to `getDiskFormat`, but did not update the comment
This is to do the small cleanup.
**Which issue this PR fixes**
**Special notes for your reviewer**:
**Release note**:
Instead of reporting taint not found, it's better to report user
that the effect is invalid. This will help user to check errors.
So when user tries to remove a taint, two conditions will be checked:
1. Whether or not the effect is an empty string.
2. Whether or not the non-empty effect is a valid taint effect.
Automatic merge from submit-queue
Azuredisk mount on windows node
**What this PR does / why we need it**:
This PR will enable azure disk on windows node, customer could create a pod mounted with azure disk on windows node.
There are a few pending items still left:
1) Current fstype would be forced as NTFS, will change if there is such requirement
2) GetDeviceNameFromMount function is not implemented(empty) because in Linux, we could use "cat /proc/mounts" to read all mounting points in OS easily, but in Windows, there is no such place, I am still figuring out. The empty function would cause a few warning logging, but it will not affect the main logic now.
**Special notes for your reviewer**:
1. This PR depends on https://github.com/kubernetes/kubernetes/pull/51240, which allow windows mount path in config validation
2. There is a bug in docker on windows(https://github.com/moby/moby/issues/34729), the ContainerPath could only be a drive letter now(e.g. D:), dir path would fail in the end.
The example pod with mount path is like below:
```
kind: Pod
apiVersion: v1
metadata:
name: pod-uses-shared-hdd-5g
labels:
name: storage
spec:
containers:
- image: microsoft/iis
name: az-c-01
volumeMounts:
- name: blobdisk01
mountPath: 'F:'
nodeSelector:
beta.kubernetes.io/os: windows
volumes:
- name: blobdisk01
persistentVolumeClaim:
claimName: pv-dd-shared-hdd-5
```
**Release note**:
```release-note
add initial work for mount azure file on windows
fix review comments
full implementation for attach azure file on windows node
working azure file mount
remove useless functions
add a workable implementation about mounting azure file on windows node
fix review comments and make the pod creating successful even azure file mount failed
fix according to review comments
add mount_windows_test
add implementation for IsLikelyNotMountPoint func
remove mount_windows_test.go temporaly
add back unit test for mount_windows.go
add normalizeWindowsPath func
fix normalizeWindowsPath func issue
implment azure disk on windows
update bazel BUILD
revert validation.go change as it's another PR
fix merge issue and compiling issue
fix windows compiling issue
fix according to review comments
fix according to review comments
fix cross-build failure
fix according to review comments
fix test build failure temporalily
fix darwin build failure
fix azure windows test failure
add empty implementation of MakeRShared on windows
fix gofmt errors
Automatic merge from submit-queue (batch tested with PRs 51805, 51725, 50925, 51474, 51638)
Flexvolume dynamic plugin discovery: Prober unit tests and basic e2e test.
**What this PR does / why we need it**: Tests for changes introduced in PR #50031 .
As part of the prober unit test, I mocked filesystem, filesystem watch, and Flexvolume plugin initialization.
Moved the filesystem event goroutine to watcher implementation.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#51147
**Special notes for your reviewer**:
First commit contains added functionality of the mock filesystem.
Second commit is the refactor for moving mock filesystem into a common util directory.
Third commit is the unit and e2e tests.
**Release note**:
```release-note
NONE
```
/release-note-none
/sig storage
/assign @saad-ali @liggitt
/cc @mtaufen @chakri-nelluri @wongma7
Automatic merge from submit-queue
Make /var/lib/kubelet as shared during startup
This is part of ~~https://github.com/kubernetes/community/pull/589~~https://github.com/kubernetes/community/pull/659
We'd like kubelet to be able to consume mounts from containers in the future, therefore kubelet should make sure that `/var/lib/kubelet` has shared mount propagation to be able to see these mounts.
On most distros, root directory is already mounted with shared mount propagation and this code will not do anything. On older distros such as Debian Wheezy, this code detects that `/var/lib/kubelet` is a directory on `/` which has private mount propagation and kubelet bind-mounts `/var/lib/kubelet` as rshared.
Both "regular" linux mounter and `NsenterMounter` are updated here.
@kubernetes/sig-storage-pr-reviews @kubernetes/sig-node-pr-reviews
@vishh
Release note:
```release-note
Kubelet re-binds /var/lib/kubelet directory with rshared mount propagation during startup if it is not shared yet.
```
Automatic merge from submit-queue (batch tested with PRs 51574, 51534, 49257, 44680, 48836)
Task 1: Tainted node by condition.
**What this PR does / why we need it**:
Tainted node by condition for MemoryPressure, OutOfDisk and so on.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: part of #42001
**Release note**:
```release-note
Tainted nodes by conditions as following:
* 'node.kubernetes.io/network-unavailable=:NoSchedule' if NetworkUnavailable is true
* 'node.kubernetes.io/disk-pressure=:NoSchedule' if DiskPressure is true
* 'node.kubernetes.io/memory-pressure=:NoSchedule' if MemoryPressure is true
* 'node.kubernetes.io/out-of-disk=:NoSchedule' if OutOfDisk is true
```
Kubelet makes sure that /var/lib/kubelet is rshared when it starts.
If not, it bind-mounts it with rshared propagation to containers
that mount volumes to /var/lib/kubelet can benefit from mount propagation.
fsGroup check will be enforcing that if a volume has already been
mounted by one pod and another pod wants to mount it but has a different
fsGroup value, this mount operation will not be allowed.
Automatic merge from submit-queue (batch tested with PRs 46458, 50934, 50766, 50970, 47698)
kubeadm: Warn in preflight checks if KubernetesVersion is of a newer branch than kubeadm
**What this PR does / why we need it**:
see https://github.com/kubernetes/kubeadm/issues/307
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
https://github.com/kubernetes/kubeadm/issues/307
**Special notes for your reviewer**:
**Release note**:
Automatic merge from submit-queue (batch tested with PRs 46458, 50934, 50766, 50970, 47698)
Prepare VolumeHost for running mount tools in containers
This is the first part of implementation of https://github.com/kubernetes/features/issues/278 - running mount utilities in containers.
It updates `VolumeHost` interface:
* `GetMounter()` now requires volume plugin name, as it is going to return different mounter to different volume plugings, because mount utilities for these plugins can be on different places.
* New `GetExec()` method that should volume plugins use to execute any utilities. This new `Exec` interface will execute them on proper place.
* `SafeFormatAndMount` is updated to the new `Exec` interface.
This is just a preparation, `GetExec` right now leads to simple `os.Exec` and mount utilities are executed on the same place as before. Also, the volume plugins will be updated in subsequent PRs (split into separate PRs, some plugins required lot of changes).
```release-note
NONE
```
@kubernetes/sig-storage-pr-reviews
@rootfs @gnufied
Automatic merge from submit-queue (batch tested with PRs 50693, 50831, 47506, 49119, 50871)
Use reflect.DeepEqual to replace slicesEqual
**What this PR does / why we need it**:
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes https://github.com/kubernetes/kubernetes/issues/50952
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue
verify pkg/util contains no code
**What this PR does / why we need it**:
verify util packages contain no go codes
related issue: #49923
Automatic merge from submit-queue (batch tested with PRs 50550, 50768)
Cleanup locking in configz
**What this PR does / why we need it**:
- Reduce scope of lock in `write()` method
- Use the read lock in `write()` method
**Release note**:
```release-note
NONE
```
/kind cleanup
@mikedanese
p.s. looks like the `Set()` method could be removed if the value is accepted as an argument to `New()`. I.e. looks like to code re-sets the value.
Automatic merge from submit-queue (batch tested with PRs 50537, 49699, 50160, 49025, 50205)
AddOrUpdateTaint should ignore duplicate Taint.
The parameter of AddOrUpdateTaint is Taint pointer, so should use
Taint object itself to compare with the node's taint list to ignore
duplicate taint.
While doing #49384, found this issue and fixed.
Fixed part of #49384, other test cases will be added in the following patch
**Release note**:
```
None
```
For iptables save and restore operations, kube-proxy currently uses
the IPv4 versions of the iptables save and restore utilities
(iptables-save and iptables-restore, respectively). For IPv6 operation,
the IPv6 versions of these utilities needs to be used
(ip6tables-save and ip6tables-restore, respectively).
Both this change and PR #48551 are needed to get Kubernetes services
to work in an IPv6-only Kubernetes cluster (along with setting
'--bind-address ::0' on the kube-proxy command line. This change
was alluded to in a discussion on services for issue #1443.
fixes#50474
Automatic merge from submit-queue
Run mount in its own systemd scope.
Kubelet needs to run /bin/mount in its own cgroup.
- When kubelet runs as a systemd service, "systemctl restart kubelet" may kill all processes in the same cgroup and thus terminate fuse daemons that are needed for gluster and cephfs mounts.
- When kubelet runs in a docker container, restart of the container kills all fuse daemons started in the container.
Killing fuse daemons is bad, it basically unmounts volumes from running pods.
This patch runs mount via "systemd-run --scope /bin/mount ...", which makes sure that any fuse daemons are forked in its own systemd scope (= cgroup) and they will survive restart of kubelet's systemd service or docker container.
This helps with #34965
As a downside, each new fuse daemon will run in its own transient systemd service and systemctl output may be cluttered.
@kubernetes/sig-storage-pr-reviews
@kubernetes/sig-node-pr-reviews
```release-note
fuse daemons for GlusterFS and CephFS are now run in their own systemd scope when Kubernetes runs on a system with systemd.
```
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 (batch tested with PRs 50029, 48517, 49739, 49866, 49782)
iptables_test should not run on OSX or Windows
**What this PR does / why we need it**:
Fix for failing tests. Let's just skip these on darwin and windows
platforms as iptables is not available on these.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Fixes#48509
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Kubelet needs to run /bin/mount in its own cgroup.
- When kubelet runs as a systemd service, "systemctl restart kubelet" may kill
all processes in the same cgroup and thus terminate fuse daemons that are
needed for gluster and cephfs mounts.
- When kubelet runs in a docker container, restart of the container kills all
fuse daemons started in the container.
Killing fuse daemons is bad, it basically unmounts volumes from running pods.
This patch runs mount via "systemd-run --scope /bin/mount ...", which makes
sure that any fuse daemons are forked in its own systemd scope (= cgroup) and
they will survive restart of kubelet's systemd service or docker container.
As a downside, each new fuse daemon will run in its own transient systemd
service and systemctl output may be cluttered.
Automatic merge from submit-queue (batch tested with PRs 49420, 49296, 49299, 49371, 46514)
Refactoring taint functions to reduce sprawl
**What this PR does / why we need it**:
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#45060
**Special notes for your reviewer**:
@gmarek @timothysc @k82cn @jayunit100 - I moved some fn's to helpers and some to utils. LMK, if you are ok with this change.
**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
Fix findmnt parsing in containerized kubelet
NsEnterMounter should not stop parsing findmnt output on the first space but on the last one, just in case the mount point name itself contains a space.
Fixes#49106
```release-note
Fixed unmounting of vSphere volumes when kubelet runs in a container.
```
@kubernetes/sig-storage-pr-reviews
NsEnterMounter should not stop parsing findmnt output on the first space but
on the last one, just in case the mount point name itself contains a space.
Automatic merge from submit-queue
Fix subPath existence check to not follow symlink
**What this PR does / why we need it**:
Volume mounting logic introduced in #43775 and #45623 checks
for subPath existence before attempting to create a directory,
should subPath not be present.
This breaks if subPath is a dangling symlink, os.Stat returns
"do not exist" status, yet `os.MkdirAll` can't create directory
as symlink is present at the given path.
This patch makes existence check to use os.Lstat which works for
normal files/directories as well as doesn't not attempt to follow
symlink, therefore it's "do not exist" status is more reliable when
making a decision whether to create directory or not.
subPath symlinks can be dangling in situations where kubelet is
running in a container itself with access to docker socket, such
as CoreOS's kubelet-wrapper script
**Release note**:
```release-note
Fix pods failing to start when subPath is a dangling symlink from kubelet point of view, which can happen if it is running inside a container
```
Automatic merge from submit-queue
fix system language judging bug in loadSystemLanguage
Signed-off-by: allencloud <allen.sun@daocloud.io>
**What this PR does / why we need it**:
This PR removes some unused code in loadSystemLanguage. Since in code `pieces := strings.Split(langStr, ".")`, even `langStr` is an empty string, `piece` is a slice with one element of empty string, so there is no chance that len(pieces) == 0.
According to these, I think it is OK to remove the unused code in loadSystemLanguage.
According to the discuss we had, finally we decided to use a more accurate way to change the code, using `if len(pieces) != 1` to make the decision.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
NONE
**Special notes for your reviewer**:
NONE
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue
Local storage teardown fix
**What this PR does / why we need it**: Local storage uses bindmounts and the method IsLikelyNotMountPoint does not detect these as mountpoints. Therefore, local PVs are not properly unmounted when they are deleted.
**Which issue this PR fixes**: fixes#48331
**Special notes for your reviewer**:
You can use these e2e tests to reproduce the issue and validate the fix works appropriately https://github.com/kubernetes/kubernetes/pull/47999
The existing method IsLikelyNotMountPoint purposely does not check mountpoints reliability (4c5b22d4c6/pkg/util/mount/mount_linux.go (L161)), since the number of mountpoints can be large. 4c5b22d4c6/pkg/util/mount/mount.go (L46)
This implementation changes the behavior for local storage to detect mountpoints reliably, and avoids changing the behavior for any other callers to a UnmountPath.
**Release note**:
```
Fixes bind-mount teardown failure with non-mount point Local volumes (issue https://github.com/kubernetes/kubernetes/issues/48331).
```
Added IsNotMountPoint method to mount utils (pkg/util/mount/mount.go)
Added UnmountMountPoint method to volume utils (pkg/volume/util/util.go)
Call UnmountMountPoint method from local storage (pkg/volume/local/local.go)
IsLikelyNotMountPoint behavior was not modified, so the logic/behavior for UnmountPath is not modified
Automatic merge from submit-queue (batch tested with PRs 47234, 48410, 48514, 48529, 48348)
Remove unused sub-pkgs in pkg/util
**What this PR does / why we need it**:
Remove no longer used sug-pkgs in pkg/util
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#48386
**Special notes for your reviewer**:
/cc @deads2k
**Release note**:
```release-note
NONE
```
Volume mounting logic introduced in #43775 and #45623 checks
for subPath existence before attempting to create a directory,
should subPath not be present.
This breaks if subPath is a dangling symlink, os.Stat returns
"do not exist" status, yet `os.MkdirAll` can't create directory
as symlink is present at the given path.
This patch makes existence check to use os.Lstat which works for
normal files/directories as well as doesn't not attempt to follow
symlink, therefore it's "do not exist" status is more reliable when
making a decision whether to create directory or not.
subPath symlinks can be dangling in situations where kubelet is
running in a container itself with access to docker socket, such
as CoreOS's kubelet-wrapper script
Automatic merge from submit-queue (batch tested with PRs 48264, 48324, 48125, 47944, 47489)
fix CopyStrings and ShuffleStrings for slice when slice is nil
Signed-off-by: allencloud <allen.sun@daocloud.io>
**What this PR does / why we need it**:
This PR fixes two functions in util/slice.go, in which I think `CopyStrings` and `ShuffleStrings` miss one case. The case is input data is nil, in this case I think the data returned should be nil as well rather than a non-nil slice with 0 element.
In addition, I added some test code for this.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
NONE, I did not raise a issue for this code. I ran into this when code learning.
**Special notes for your reviewer**:
NONE
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 43005, 46660, 46385, 46991, 47103)
Consolidate sysctl commands for kubelet
**What this PR does / why we need it**:
These commands are important enough to be in the Kubelet itself.
By default, Ubuntu 14.04 and Debian Jessie have these set to 200 and
20000. Without this setting, nodes are limited in the number of
containers that they can start.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#26005
**Special notes for your reviewer**:
I had a difficult time writing tests for this. It is trivial to create a fake sysctl for testing, but the Kubelet does not have any tests for the prior settings.
**Release note**:
```release-note
```
Automatic merge from submit-queue (batch tested with PRs 46235, 44786, 46833, 46756, 46669)
Add Japanese translation for kubectl
**What this PR does / why we need it**:
I messed up the original PR(#45562) which was already been reviewed and approved. This PR provides first attempt to translate kubectl in Japanese (related to #40645 and #40591).
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
No issues
**Special notes for your reviewer**:
Should be reviewed by member of Japanese k8s community (I stayed in Japan for 4 years, but my language is not as good as native Japanese)
Automatic merge from submit-queue (batch tested with PRs 43275, 45014, 46449, 46488, 46525)
Fix typo
**What this PR does / why we need it**:
**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 (batch tested with PRs 44774, 46266, 46248, 46403, 46430)
kube-proxy: ratelimit runs of iptables by sync-period flags
This bounds how frequently iptables can be synced. It will be no more often than every 10 seconds and no less often than every 1 minute, by default.
@timothysc FYI
@dcbw @freehan FYI
Automatic merge from submit-queue (batch tested with PRs 45573, 46354, 46376, 46162, 46366)
Add Simplified Chinese translation for kubectl
What this PR does / why we need it:
This PR provides first attempt to translate kubectl in Simplified Chinese.
Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #
No issues
Special notes for your reviewer:
Although I'm a native speaker for Mandarin Chinese, but I think translation is a whole different knowledge which I'm not good at it, so this pr absolutely need to be polished.
@adohe @mengqiy @resouer @k82cn @caesarxuchao @wanghaoran1988 sorry I think there are so many folks who are good at Chinese I haven't mention, feel free to leave a comment on it : )
also cc @brendandburns
Automatic merge from submit-queue (batch tested with PRs 46022, 46055, 45308, 46209, 43590)
Remove Save() from iptables interface
This is what @thockin requested in one of the reviews.
Automatic merge from submit-queue (batch tested with PRs 38990, 45781, 46225, 44899, 43663)
migrate set generation to go_genrule
Depends on https://github.com/kubernetes/release/pull/238
Includes these changes:
- Modified so that IPv6 CIDRs can be converted correctly.
- Added test cases for IPv6 addresses.
- Split UTs for hexCIDR() and asciiCIDR() so that masking can be tested.
- Add UTs for failure cases.
Note: Some code that calls hexCIDR() builds a CIDR from the pod IP string
and the concatenation of "/32". These should, in the future, use "128",
if/when the pod IP is IPv6. Not addressed as part of this commit.
Automatic merge from submit-queue
Make fake iptables' Save operation more realistic
Ref https://github.com/kubernetes/kubernetes/pull/45622#issuecomment-301624384 (2nd point)
This would make fake IPtables actually return the iptable contents it stores.
cc @kubernetes/sig-scalability-misc @wojtek-t
Module remotecommand originally part of kubernetes/pkg/client/unversioned was moved
to client-go/tools, and will be used as authoritative in kubectl, e2e and other places.
Module remotecommand relies on util/exec module which will be copied to client-go/pkg/util
Automatic merge from submit-queue
util/iptables: grab iptables locks if iptables-restore doesn't support --wait
When iptables-restore doesn't support --wait (which < 1.6.2 don't), it may
conflict with other iptables users on the system, like docker, because it
doesn't acquire the iptables lock before changing iptables rules. This causes
sporadic docker failures when starting containers.
To ensure those don't happen, essentially duplicate the iptables locking
logic inside util/iptables when we know iptables-restore doesn't support
the --wait option.
Unfortunately iptables uses two different locking mechanisms, one until
1.4.x (abstract socket based) and another from 1.6.x (/run/xtables.lock
flock() based). We have to grab both locks, because we don't know what
version of iptables-restore exists since iptables-restore doesn't have
a --version option before 1.6.2. Plus, distros (like RHEL) backport the
/run/xtables.lock patch to 1.4.x versions.
Related: https://github.com/kubernetes/kubernetes/pull/43575
See also: https://github.com/openshift/origin/pull/13845
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1417234
@kubernetes/rh-networking @kubernetes/sig-network-misc @eparis @knobunc @danwinship @thockin @freehan
Automatic merge from submit-queue
fix the typos of e.g.
fix the typos of e.g.
**What this PR does / why we need it**:
**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
```
These commands are important enough to be in the Kubelet itself.
By default, Ubuntu 14.04 and Debian Jessie have these set to 200 and
20000. Without this setting, nodes are limited in the number of
containers that they can start.
Several of these loops overlap, and when they are the reason a failure
is happening it is difficult to sort them out. Slighly misalign these
loops to make their impact obvious.
When iptables-restore doesn't support --wait (which < 1.6.2 don't), it may
conflict with other iptables users on the system, like docker, because it
doesn't acquire the iptables lock before changing iptables rules. This causes
sporadic docker failures when starting containers.
To ensure those don't happen, essentially duplicate the iptables locking
logic inside util/iptables when we know iptables-restore doesn't support
the --wait option.
Unfortunately iptables uses two different locking mechanisms, one until
1.4.x (abstract socket based) and another from 1.6.x (/run/xtables.lock
flock() based). We have to grab both locks, because we don't know what
version of iptables-restore exists since iptables-restore doesn't have
a --version option before 1.6.2. Plus, distros (like RHEL) backport the
/run/xtables.lock patch to 1.4.x versions.
Related: https://github.com/kubernetes/kubernetes/pull/43575
See also: https://github.com/openshift/origin/pull/13845
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1417234
Automatic merge from submit-queue (batch tested with PRs 40060, 44860, 44865, 44825, 44162)
Remove unused chmod/chown abstractions
**What this PR does / why we need it**: Simplifies the code
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*:
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 43575, 44672)
util/iptables: check for and use new iptables-restore 'wait' argument
iptables-restore did not previously perform any locking, meaning that
when callers (like kube-proxy) asked iptables-restore to write large
numbers of rules, the iptables-restore process might run in parallel
with other 'iptables' invocations in kubelet (hostports), docker,
and other software. This causes errors like:
"CNI request failed with status 400: 'Failed to ensure that nat chain
POSTROUTING jumps to MASQUERADE: error checking rule: exit status 4:
iptables: Resource temporarily unavailable."
or from Docker:
"Failed to allocate and map port 1095-1095: iptables failed:
iptables --wait -t nat -A DOCKER -p tcp -d 0/0 --dport 1095
-j DNAT --to-destination 10.1.0.2:1095 ! -i lbr0: iptables:
Resource temporarily unavailable.\n (exit status 4)"
iptables-restore "wait" functionality was added in iptables git
commit 999eaa241212d3952ddff39a99d0d55a74e3639e which
is not yet in a release.
See also https://bugzilla.redhat.com/show_bug.cgi?id=1417234
@eparis @knobunc @kubernetes/rh-networking @kubernetes/sig-network-misc @freehan @thockin @brendandburns
iptables-restore did not previously perform any locking, meaning that
when callers (like kube-proxy) asked iptables-restore to write large
numbers of rules, the iptables-restore process might run in parallel
with other 'iptables' invocations in kubelet (hostports), docker,
and other software. This causes errors like:
"CNI request failed with status 400: 'Failed to ensure that nat chain
POSTROUTING jumps to MASQUERADE: error checking rule: exit status 4:
iptables: Resource temporarily unavailable."
or from Docker
"Failed to allocate and map port 1095-1095: iptables failed:
iptables --wait -t nat -A DOCKER -p tcp -d 0/0 --dport 1095
-j DNAT --to-destination 10.1.0.2:1095 ! -i lbr0: iptables:
Resource temporarily unavailable.\n (exit status 4)"
iptables-restore "wait" functionality was added in iptables git
commit 999eaa241212d3952ddff39a99d0d55a74e3639e but is NOT YET
in a released version of iptables.
See also https://bugzilla.redhat.com/show_bug.cgi?id=1417234
Automatic merge from submit-queue (batch tested with PRs 44222, 44614, 44292, 44638)
Smarter generic getters and describers
Makes printers and describers smarter for generic resources.
This traverses unstructured objects and prints their attributes for generic resources (TPR, federated API, etc) in `kubectl get` and `kubectl describe`. Makes use of the object's field names to come up with a best guess for describer labels and get headers, and field value types to understand how to better print it, indent, etc.
A nice intermediate solution while we don't have [get and describe extensions](https://github.com/kubernetes/community/pull/308).
Examples:
```
$ kubectl get serviceclasses
NAME KIND BINDABLE BROKER NAME OSB GUID
user-provided-service ServiceClass.v1alpha1.servicecatalog.k8s.io false ups-broker 4f6e6cf6-ffdd-425f-a2c7-3c9258ad2468
```
```
$ kubectl describe serviceclasses/user-provided-service
Name: user-provided-service
Namespace:
Labels: <none>
Annotations: FOO=BAR
openshift.io/deployment.phase=test
OSB Metadata: <nil>
Kind: ServiceClass
Metadata:
Self Link: /apis/servicecatalog.k8s.io/v1alpha1/serviceclassesuser-provided-service
UID: 1509bd96-1b05-11e7-98bd-0242ac110006
Resource Version: 256
Creation Timestamp: 2017-04-06T20:10:29Z
Broker Name: ups-broker
Bindable: false
Plan Updatable: false
OSB GUID: 4f6e6cf6-ffdd-425f-a2c7-3c9258ad2468
API Version: servicecatalog.k8s.io/v1alpha1
Plans:
Name: default
OSB GUID: 86064792-7ea2-467b-af93-ac9694d96d52
OSB Free: true
OSB Metadata: <nil>
Events: <none>
```
**Release note**:
```release-note
Improved output on 'kubectl get' and 'kubectl describe' for generic objects.
```
PTAL @pmorie @pwittrock @kubernetes/sig-cli-pr-reviews
Automatic merge from submit-queue (batch tested with PRs 40055, 42085, 44509, 44568, 43956)
Fix gofmt errors
**What this PR does / why we need it**:
There were some gofmt errors on master. Ran the following to fix:
```
hack/verify-gofmt.sh | grep ^diff | awk '{ print $2 }' | xargs gofmt -w -s
```
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: none
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 44406, 41543, 44071, 44374, 44299)
Decouple remotecommand
Refactored unversioned/remotecommand to decouple it from undesirable dependencies:
- term package now is not required, and functionality required to resize terminal size can be plugged in directly in kubectl
- in order to remove dependency on kubelet package - constants from kubelet/server/remotecommand were moved to separate util package (pkg/util/remotecommand)
- remotecommand_test.go moved to pkg/client/tests module
Automatic merge from submit-queue (batch tested with PRs 43378, 43216, 43384, 43083, 43428)
Do not reformat devices with partitions
`lsblk` reports FSTYPE of devices with partition tables as empty string `""`,
which is indistinguishable from empty devices. We must look for dependent
devices (i.e. partitions) to see that the device is really empty and report
error otherwise.
The main point of this patch is to run `lsblk` without `"-n"`, i.e. print all
dependent devices and check it output.
Sample output:
```
FirstSeen LastSeen Count From SubObjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
10s 10s 1 default-scheduler Normal Scheduled Successfully assigned testpod to ip-172-18-11-149.ec2.internal
2s 2s 1 kubelet, ip-172-18-11-149.ec2.internal Warning FailedMount MountVolume.MountDevice failed for volume "kubernetes.io/aws-ebs/vol-0fa9da8b91913b187" (spec.Name: "vol") pod "b74f68c5-0d6a-11e7-9233-0e11251010c0" (UID: "b74f68c5-0d6a-11e7-9233-0e11251010c0") with: failed to mount the volume as "ext4", it already contains unknown data, probably partitions. Mount error: mount failed: exit status 32
Mounting command: mount
Mounting arguments: /dev/xvdbb /var/lib/kubelet/plugins/kubernetes.io/aws-ebs/mounts/vol-0fa9da8b91913b187 ext4 [defaults]
Output: mount: wrong fs type, bad option, bad superblock on /dev/xvdbb,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
```
Without this patch, the device would be reformatted and all data in the device partitions would be lost.
Fixes#13212
Release note:
```release-note
NONE
```
@kubernetes/sig-storage-pr-reviews
Automatic merge from submit-queue (batch tested with PRs 41139, 41186, 38882, 37698, 42034)
Make kubelet never delete files on mounted filesystems
With bug #27653, kubelet could remove mounted volumes and delete user data.
The bug itself is fixed, however our trust in kubelet is significantly lower.
Let's add an extra version of RemoveAll that does not cross mount boundary
(rm -rf --one-file-system).
It calls lstat(path) three times for each removed directory - once in
RemoveAllOneFilesystem and twice in IsLikelyNotMountPoint, however this way
it's platform independent and the directory that is being removed by kubelet
should be almost empty.
lsblk reports FSTYPE of devices with partition tables as empty string "",
which is indistinguishable from empty devices. We must look for dependent
devices (i.e. partitions) to see that the device is really empty and report
error otherwise.
I checked that LVM, LUKS and MD RAID have their own FSTYPE in lsblk output,
so it should be only a partition table that has empty FSTYPE.
The main point of this patch is to run lsblk without "-n", i.e. print all
dependent devices and check if they're there.
With this PR, the second call to `Acquire()` will block unless the lock is released (process exits).
Also removed the memory mutex in the previous code since we don't need `Release()` here so no need to save and protect the local fd.
Fix#42929.
Automatic merge from submit-queue (batch tested with PRs 42316, 41618, 42201, 42113, 42191)
Support unqualified and partially qualified domain name in DNS query in Windows kube-proxy
**What this PR does / why we need it**:
In Windows container networking, --dns-search is not currently supported on Windows Docker. Besides, even with --dns-suffix, inside Windows container DNS suffix is not appended to DNS query names. That makes unqualified domain name or partially qualified domain name in DNS query not able to resolve.
This PR provides a solution to resolve unqualified domain name or partially qualified domain name in DNS query for Windows container in Windows kube-proxy. It uses well-known Kubernetes DNS suffix as well host DNS suffix search list to append to the name in DNS query. DNS packet in kube-proxy UDP stream is modified as appropriate.
This PR affects the Windows kube-proxy only.
**Special notes for your reviewer**:
This PR is based on top of Anthony Howe's commit 48647fb, 0e37f0a and 7e2c71f which is already included in the PR 41487. Please only review commit b9dfb69.
**Release note**:
```release-note
Add DNS suffix search list support in Windows kube-proxy.
```
Automatic merge from submit-queue (batch tested with PRs 35094, 42095, 42059, 42143, 41944)
Use chroot for containerized mounts
This PR is to modify the containerized mounter script to use chroot
instead of rkt fly. This will avoid the problem of possible large number
of mounts caused by rkt containers if they are not cleaned up.
With bug #27653, kubelet could remove mounted volumes and delete user data.
The bug itself is fixed, however our trust in kubelet is significantly lower.
Let's add an extra version of RemoveAll that does not cross mount boundary
(rm -rf --one-file-system).
It calls lstat(path) three times for each removed directory - once in
RemoveAllOneFilesystem and twice in IsLikelyNotMountPoint, however this way
it's platform independent and the directory that is being removed by kubelet
should be almost empty.
Automatic merge from submit-queue (batch tested with PRs 41116, 41804, 42104, 42111, 42120)
make kubectl taint command respect effect NoExecute
**What this PR does / why we need it**:
Part of feature forgiveness implementation, make kubectl taint command respect effect NoExecute.
**Which issue this PR fixes**:
Related Issue: #1574
Related PR: #39469
**Special notes for your reviewer**:
**Release note**:
```release-note
make kubectl taint command respect effect NoExecute
```
Automatic merge from submit-queue (batch tested with PRs 41116, 41804, 42104, 42111, 42120)
Add support for attacher/detacher interface in Flex volume
Add support for attacher/detacher interface in Flex volume
This change breaks backward compatibility and requires to be release noted.
```release-note
Flex volume plugin is updated to support attach/detach interfaces. It broke backward compatibility. Please update your drivers and implement the new callouts.
```
Kubernetes Submit Queue