Automatic merge from submit-queue (batch tested with PRs 50208, 50259, 49702, 50267, 48986)
Relax restrictions on environment variable names.
Fixes#2707
The POSIX standard restricts environment variable names to uppercase letters, digits, and the underscore character in shell contexts only. For generic application usage, it is stated that all other characters shall be tolerated. (Reference [here](http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html), my prose reasoning [here](https://github.com/kubernetes/kubernetes/issues/2707#issuecomment-285309156).)
This change relaxes the rules to some degree. Namely, we stop requiring environment variable names to be strict `C_IDENTIFIERS` and start permitting lowercase, dot, and dash characters.
Public container images using environment variable names beyond the shell-only context can benefit from this relaxation. Elasticsearch is one popular example.
Automatic merge from submit-queue (batch tested with PRs 49885, 49751, 49441, 49952, 49945)
Ignore UDP metrics in kubelet
Updating cadvisor godeps to 0.26.0 for the 1.7 release (#46658) added udp metrics. However, they were not disabled in the kubelet.
This PR disables collection of UDP metrics in the kubelet.
This should be cherrypicked to the 1.7 branch.
cc @dchen1107
Automatic merge from submit-queue
simplify if and else for code
Signed-off-by: allencloud <allen.sun@daocloud.io>
**What this PR does / why we need it**:
This PR tries to simplify the code of if and else, and this could make code a little bit cleaner.
**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
Timeout and Max-in-flight don't report non-resource URLs correctly.
Unify error reporting for 429 and 504 to be correct for timeout and max in flight and eviction. Add better messages to eviction (removing a todo). Return the correct body content for timeouts (reason and code should be correct).
This potentially increases cardinality of 429, but because non-api urls may be under the max-inflight budget we need to report them somewhere (if something breaks and starts fetching API versions endlessly).
```release-note
The 504 timeout error was returning a JSON error body that indicated it was a 500. The body contents now correctly report a 500 error.
```
Automatic merge from submit-queue
Update OWNERS to correct members' handles
**What this PR does / why we need it**:
Fix some typos of members' handles as per https://github.com/kubernetes/kubernetes/issues/50048#issuecomment-319831957.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Associated with: #50048
**Special notes for your reviewer**:
/cc @madhusudancs @sebgoa @liggitt @saad-ali
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 50119, 48366, 47181, 41611, 49547)
Fail on swap enabled and deprecate experimental-fail-swap-on flag
**What this PR does / why we need it**:
* Deprecate the old experimental-fail-swap-on
* Add a new flag fail-swap-on and set it to true
Before this change, we would not fail when swap is on. With this
change we fail for everyone when swap is on, unless they explicitly
set --fail-swap-on to false.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Fixes#34726
**Special notes for your reviewer**:
**Release note**:
```release-note
Kubelet will by default fail with swap enabled from now on. The experimental flag "--experimental-fail-swap-on" has been deprecated, please set the new "--fail-swap-on" flag to false if you wish to run with /proc/swaps on.
```
Automatic merge from submit-queue
kubelet: remove code for handling old pod/containers paths
**What this PR does / why we need it**:
This PR removes the code for handling the paths that has been deprecated for a long time.
**Release note**:
```release-note
NONE
```
CC @simo5
Automatic merge from submit-queue (batch tested with PRs 50103, 49677, 49449, 43586, 48969)
Do not try to run preStopHook when the gracePeriod is 0
**What this PR does / why we need it**:
1. Sometimes when the user force deletes a POD with no gracePeriod, its possible that kubelet attempts to execute the preStopHook which will certainly fail. This PR prevents this inavitable PreStopHook failure.
```
kubectl delete --force --grace-period=0 po/<pod-name>
```
2. This also adds UT for LifeCycle Hooks
```
time go test --cover -v --run "Hook" ./pkg/kubelet/kuberuntime/
.
.
.
--- PASS: TestLifeCycleHook (0.00s)
--- PASS: TestLifeCycleHook/PreStop-CMDExec (0.00s)
--- PASS: TestLifeCycleHook/PreStop-HTTPGet (0.00s)
--- PASS: TestLifeCycleHook/PreStop-NoTimeToRun (0.00s)
--- PASS: TestLifeCycleHook/PostStart-CmdExe (0.00s)
PASS
coverage: 15.3% of statements
ok k8s.io/kubernetes/pkg/kubelet/kuberuntime 0.429s
```
**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**:
```
Do not try to run preStopHook when the gracePeriod is 0
```
Automatic merge from submit-queue
Fix incorrect owner in OWNERS
**What this PR does / why we need it**:
typo: yuyuhong --> yujuhong
**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/50048#issuecomment-319846621
**Special notes for your reviewer**:
/assign @yujuhong
I don't know whether you can approve this PR or not in such case 😄
**Release note**:
```release-note
NONE
```
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 49237, 49656, 49980, 49841, 49899)
certificate manager: close existing client conns once cert rotates
After the kubelet rotates its client cert, it will keep connections to the API server open indefinitely, causing it to use its old credentials instead of the new certs. Because the API server authenticates client certs at the time of the request, and not the handshake, this could cause the kubelet to start hitting auth failures even if it rotated its certificate to a new, valid one.
When the kubelet rotates its cert, close down existing connections to force a new TLS handshake.
Ref https://github.com/kubernetes/features/issues/266
Updates https://github.com/kubernetes-incubator/bootkube/pull/663
```release-note
After a kubelet rotates its client cert, it now closes its connections to the API server to force a handshake using the new cert. Previously, the kubelet could keep its existing connection open, even if the cert used for that connection was expired and rejected by the API server.
```
/cc @kubernetes/sig-auth-bugs
/assign @jcbsmpsn @mikedanese
Automatic merge from submit-queue (batch tested with PRs 49237, 49656, 49980, 49841, 49899)
[Bug Fix] Set NodeOODCondition to false
fixes#49839, which was introduced by #48846
This PR makes the kubelet set NodeOODCondition to false, so that the scheduler and other controllers do not consider the node to be unschedulable.
/assign @vishh
/sig node
/release-note-none
* Deprecate the old experimental-fail-swap-on
* Add a new flag fail-swap-on and set it to true
Before this change, we would not fail when swap is on. With this
change we fail for everyone when swap is on, unless they explicitly
set --fail-swap-on to false.
Automatic merge from submit-queue
If error continue for loop
If err does not add continue, type conversion will be error.
If do not add continue, pod. (* V1.Pod) may cause panic to run.
**Release note**:
```release-note
NONE
```
After the kubelet rotates its client cert, it will keep connections
to the API server open indefinitely, causing it to use its old
credentials instead of the new certs
When the kubelet rotates its cert, close down existing connections
to force a new TLS handshake.
Automatic merge from submit-queue (batch tested with PRs 49284, 49555, 47639, 49526, 49724)
skip WaitForAttachAndMount for terminated pods in syncPod
Fixes https://github.com/kubernetes/kubernetes/issues/49663
I tried to tread lightly with a small localized change because this needs to be picked to 1.7 and 1.6 as well.
I suspect this has been as issue since we started unmounting volumes on pod termination https://github.com/kubernetes/kubernetes/pull/37228
xref openshift/origin#14383
@derekwaynecarr @eparis @smarterclayton @saad-ali @jwforres
/release-note-none
Automatic merge from submit-queue (batch tested with PRs 49284, 49555, 47639, 49526, 49724)
Change pod config to manifest
**What this PR does / why we need it**:
As per https://github.com/kubernetes/kubernetes/pull/46494#discussion_r119675805, change `config` to `manifest` to avoid ambiguous.
**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**:
Since it's a minor fix, there is no issue here.
/cc @mtaufen
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 49651, 49707, 49662, 47019, 49747)
Add support for `no_new_privs` via AllowPrivilegeEscalation
**What this PR does / why we need it**:
Implements kubernetes/community#639
Fixes#38417
Adds `AllowPrivilegeEscalation` and `DefaultAllowPrivilegeEscalation` to `PodSecurityPolicy`.
Adds `AllowPrivilegeEscalation` to container `SecurityContext`.
Adds the proposed behavior to `kuberuntime`, `dockershim`, and `rkt`. Adds a bunch of unit tests to ensure the desired default behavior and that when `DefaultAllowPrivilegeEscalation` is explicitly set.
Tests pass locally with docker and rkt runtimes. There are also a few integration tests with a `setuid` binary for sanity.
**Release note**:
```release-note
Adds AllowPrivilegeEscalation to control whether a process can gain more privileges than it's parent process
```
The POSIX standard restricts environment variable names to uppercase
letters, digits, and the underscore character in shell contexts only.
For generic application usage, it is stated that all other characters
shall be tolerated.
This change relaxes the rules to some degree. Namely, we stop requiring
environment variable names to be strict C_IDENTIFIERS and start
permitting lowercase, dot, and dash characters.
Public container images using environment variable names beyond the
shell-only context can benefit from this relaxation. Elasticsearch is
one popular example.
Automatic merge from submit-queue (batch tested with PRs 47738, 49196, 48907, 48533, 48822)
Fix TODO: rename podInfraContainerID to sandboxID
**What this PR does / why we need it**:
Code-cleanup in kubelet to use consistent naming for sandbox ID. Not super urgent, but thought it would be nice to knock off some TODOs.
**Which issue this PR fixes**
Fixes a TODO in the code, no associated issue.
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 47357, 49514, 49271, 49572, 49476)
Using only the exit code to decide when to fall back on logs
We expect the exit code to be non-zero if the the container process was
OOM killed. Remove the check that uses the "Reason" field.
Automatic merge from submit-queue (batch tested with PRs 45040, 48960)
Do not generate warning event on dns search deduplication
In the case that the node is able to use the cluster DNS, `cluster.local` will already be in the node search domains in `/etc/resolv.conf`. The kubelet then parses `/etc/resolv.conf` on the node and combines it with $namespace.svc.$clusterDomain, svc.$clusterDomain, and $clusterDomain to create the pod DNS search domains. clusterDomain is `cluster.local` by default. This causes the code to generate a Warning event visible to the user for _every_ pod:
```
Warning DNSSearchForming Found and omitted duplicated dns domain in host search line: 'cluster.local' during merging with cluster dns domains
```
This is really overkill. IMHO, this should be done in the background with no user level notification or logging at all.
xref https://bugzilla.redhat.com/show_bug.cgi?id=1471198
@derekwaynecarr @eparis @vefimova
Automatic merge from submit-queue (batch tested with PRs 48976, 49474, 40050, 49426, 49430)
Use presence of kubeconfig file to toggle standalone mode
Fixes#40049
```release-note
The deprecated --api-servers flag has been removed. Use --kubeconfig to provide API server connection information instead. The --require-kubeconfig flag is now deprecated. The default kubeconfig path is also deprecated. Both --require-kubeconfig and the default kubeconfig path will be removed in Kubernetes v1.10.0.
```
/cc @kubernetes/sig-cluster-lifecycle-misc @kubernetes/sig-node-misc
Automatic merge from submit-queue (batch tested with PRs 48976, 49474, 40050, 49426, 49430)
Remove duplicated import and wrong alias name of api package
**What this PR does / why we need it**:
**Which issue this PR fixes**: fixes#48975
**Special notes for your reviewer**:
/assign @caesarxuchao
**Release note**:
```release-note
NONE
```
