Before this change, CNI plugin failure didn't change anything in
the pod status, so pods having containers without requested
network were "running".
Fixes#29148
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Add a docker-shim package
Add a new docker integration with kubelet using the new runtime API.
This change adds the package with the skeleton and implements some of the basic operations.
This PR only implements a small sets of functions. The rest of the functions will be implemented
in the followup PRs to keep the changes readable, and the reviewers sane.
Note: The first commit is from #28396, only the second commit is for review.
/cc @kubernetes/sig-node @feiskyer @Random-Liu
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Restrict log sym link to 256 characters
This fix can potentially cause conflicts in log file names. The current model of exporting log data is fundamentally broken. This PR does not attempt to fix all of the issues.
Add a new docker integration with kubelet using the new runtime API.
This change adds the package with some skeletons, and implements some
of the basic operations.
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Syncing imaging pulling backoff logic
- Syncing the backoff logic in the parallel image puller and the sequential image puller to prepare for merging the two pullers into one.
- Moving image error definitions under kubelet/images
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Allow PVs to specify supplemental GIDs
Retry of https://github.com/kubernetes/kubernetes/pull/28691 . Adds a Kubelet helper function for getting extra supplemental groups
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Removing images with multiple tags
If an image has multiple tags, we need to remove all the tags in order to make docker image removing successful.
#28491
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ImagePuller refactoring
A plain refactoring
- Moving image pullers to a new pkg/kubelet/images directory
- Hiding image pullers inside the new ImageManager
The next step is to consolidate the logic of the serialized and the parallel image pullers inside ImageManager
xref: #25577
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Kubelet: Set PruneChildren when removing image.
This is a bug introduced during switching to engine-api. https://github.com/kubernetes/kubernetes/issues/23563.
When removing image, there is an option `noprune`:
```
If prune is true, ancestor images will each attempt to be deleted quietly.
```
In go-dockerclient, the default value of the option is ["noprune=false"](https://github.com/fsouza/go-dockerclient/blob/master/image.go#L171), which means that ancestor images should be also removed. This is the expected behaviour.
However in engine-api, the option is changed to `PruneChildren`, and the default value is `PruneChildren=false`, which means that ancestor images won't be removed.
This makes `ImageRemove` only remove the first layer of the image, which causes the image garbage collection not working as expected.
This should be fixed in 1.3.
And thanks to @ronnielai for finding the bug! :)
/cc @kubernetes/sig-node
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docker_manager: Correct determineContainerIP args
This could result in the network plugin not retrieving the pod ip in a
call to SyncPod when using the `exec` network plugin.
The CNI and kubenet network plugins ignore the name/namespace arguments,
so they are not impacted by this bug.
I verified the second included test failed prior to correcting the
argument order.
Fixes#29161
cc @yujuhong
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Delete redundant if condition
The case `containerStatus == nil` has already been checked just above. It's redundant here.
This could result in the network plugin not retrieving the pod ip in a
call to SyncPod when using the `exec` network plugin.
The CNI and kubenet network plugins ignore the name/namespace arguments,
so they are not impacted by this bug.
I verified the second included test failed prior to correcting the
argument order.
Fixes#29161
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Support terminal resizing for exec/attach/run
```release-note
Add support for terminal resizing for exec, attach, and run. Note that for Docker, exec sessions
inherit the environment from the primary process, so if the container was created with tty=false,
that means the exec session's TERM variable will default to "dumb". Users can override this by
setting TERM=xterm (or whatever is appropriate) to get the correct "smart" terminal behavior.
```
Fixes#13585
Add support for terminal resizing for exec, attach, and run. Note that for Docker, exec sessions
inherit the environment from the primary process, so if the container was created with tty=false,
that means the exec session's TERM variable will default to "dumb". Users can override this by
setting TERM=xterm (or whatever is appropriate) to get the correct "smart" terminal behavior.
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Remove unnecessary calls to api.GetReference
These calls are unnecessary, can be removed. `Eventf` and others just call `GetReference` on the object they are passed.
cc @kubernetes/sig-node
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Bump minimum API version for docker to 1.21
The corresponding docker version is 1.9.x. Dropping support for docker 1.8.
/cc @kubernetes/sig-node
Use the generic runtime method to get the netns path. Also
move reading the container IP address into cni (based off kubenet)
instead of having it in the Docker manager code. Both old and new
methods use nsenter and /sbin/ip and should be functionally
equivalent.
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Filter seccomp profile path from malicious .. and /
Without this patch with `localhost/<some-releative-path>` as seccomp profile one can load any file on the host, e.g. `localhost/../../../../dev/mem` which is not healthy for the kubelet.
/cc @jfrazelle
Unit tests depend on https://github.com/kubernetes/kubernetes/pull/26710.
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Fix docker api version in kubelet
There are two variables `dockerv110APIVersion` and `dockerV110APIVersion` with
the same purpose, but different values. Remove the incorrect one and fix usage
in the file.
/cc @dchen1107 @Random-Liu
There are two variables `dockerv110APIVersion` and `dockerV110APIVersion` with
the same purpose, but different values. Remove the incorrect one and fix usage
in the file.
Double slashes are not allowed in annotation keys. Moreover, using the 63
characters of the name component in an annotation key will shorted the space
for the container name.
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Kubelet: Cache image history to eliminate the performance regression
Fix https://github.com/kubernetes/kubernetes/issues/25057.
The image history operation takes almost 50% of cpu usage in kubelet performance test. We should cache image history instead of getting it from runtime everytime.
This PR cached image history in imageStatsProvider and added unit test.
@yujuhong @vishh
/cc @kubernetes/sig-node
Mark v1.3 because this is a relatively significant performance regression.
[]()
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Use docker containerInfo.LogPath and not manually constructed path
## Pull Request Guidelines
Since the containerInfo has the LogPath in it, let's use that and
not manually construct the path ourselves. This also makes the code
less prone to breaking if docker change this path.
Fixes#23695
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Ensure that init containers are preserved during pruning
Pods with multiple init containers were getting the wrong containers
pruned. Fix an error message and add a test.
Fixes#26131
Since the containerInfo has the LogPath in it, let's use that and
not manually construct the path ourselves. This also makes the code
less prone to breaking if docker change this path.
Fixes#23695
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kubelet: Don't attempt to apply the oom score if container exited already
Containers could terminate before kubelet applies the oom score. This is normal
and the function should not error out.
This addresses #25844 partially.
/cc @smarterclayton @Random-Liu
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Remove RunInContainer interface in Kubelet Runtime interface
According to #24689, we should merge RunInContainer and ExecInContainer in the container runtime interface.
@yujuhong @kubernetes/sig-node
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Add IPv6 address support for pods - does NOT include services
This allows a container to have an IPv6 address only and extracts the address via nsenter and iproute2 or the docker client directly. An IPv6 address is now correctly reported when describing a pod.
@thockin @kubernetes/sig-network
<!-- Reviewable:start -->
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WIP v0 NVIDIA GPU support
```release-note
* Alpha support for scheduling pods on machines with NVIDIA GPUs whose kubelets use the `--experimental-nvidia-gpus` flag, using the alpha.kubernetes.io/nvidia-gpu resource
```
Implements part of #24071 for #23587
I am not familiar with the scheduler enough to know what to do with the scores. Mostly punting for now.
Missing items from the implementation plan: limitranger, rkt support, kubectl
support and docs
cc @erictune @davidopp @dchen1107 @vishh @Hui-Zhi @gopinatht
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Kubelet: Add docker operation timeout
For #23563.
Based on #24748, only the last 2 commits are new.
This PR:
1) Add timeout for all docker operations.
2) Add docker operation timeout metrics
3) Cleanup kubelet stats and add runtime operation error and timeout rate monitoring.
4) Monitor runtime operation error and timeout rate in kubelet perf.
@yujuhong
/cc @gmarek Because of the metrics change.
/cc @kubernetes/sig-node
Implements part of #24071
I am not familiar with the scheduler enough to know what to do with the scores. Punting for now.
Missing items from the implementation plan: limitranger, rkt support, kubectl
support and user docs
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kubelet: Remove redundant `Container.Created`
As far as I can tell, this has been supplanted by a) the `DockerJSON.CreatedAt` field and b) the
`ContainerStatus.CreatedAt`, where the first is used for creating the
second.
The `.Created` field was only written to as far as I can see.
cc @yifan-gu & @Random-Liu
Is there any reason we might want to keep this around?
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Kubelet: Cleanup with new engine api
Finish step 2 of #23563
This PR:
1) Cleanup go-dockerclient reference in the code.
2) Bump up the engine-api version.
3) Cleanup the code with new engine-api.
Fixes#24076.
Fixes#23809.
/cc @yujuhong
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Promote Pod Hostname & Subdomain to fields (were annotations)
Deprecating the podHostName, subdomain and PodHostnames annotations and created corresponding new fields for them on PodSpec and Endpoints types.
Annotation doc: #22564
Annotation code: #20688
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Do not update cache with so much effort
Fixes: #24298
1. Remove automatic update
2. Every time we check if we can get valid value from cache, if not, get the value directly from api
cc @Random-Liu
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Fix use of docker removed ParseRepositoryTag() function
Docker has removed the ParseRepositoryTag() function in
leading to failures using the kubernetes Go client API.
Failure:
```
../k8s.io/kubernetes/pkg/util/parsers/parsers.go:30: undefined: parsers.ParseRepositoryTag
```
This has been supplanted by a) the DockerJSON.CreatedAt field and b) the
ContainerStatus.CreatedAt, where the first is used for creating the
second.
The `.Created` field was only written to as far as I can see.
Docker has removed the ParseRepositoryTag() function in
leading to failures using the kubernetes Go client API.
Lets use github.com/docker/distribution reference.ParseNamed()
instead.
Failure:
../k8s.io/kubernetes/pkg/util/parsers/parsers.go:30: undefined: parsers.ParseRepositoryTag
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Refactor image related functions to use docker engine-api
ref #23563
Hopes can do some help, cc @Random-Liu
If it's ok, will add more work here.
This is implemented via touching a file on stop as a hook in the systemd
unit. The ctime of this file is then used to get the `finishedAt` time
in the future.
In addition, this changes the `startedAt` and `createdAt` to use the api
server's results rather than the annotations it previously used.
It's possible we might want to move this into the api in the future.
Fixes#23887
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Kubelet: Refactor all but image related functions in DockerInterface
For #23563.
Based on #23699 and #23844.
Only last 3 commits are new. This PR refactored all functions except image related functions, including:
* CreateExec
* StartExec
* InspectExec
* AttachToContainer
* Logs
* Info
* Version
@kubernetes/sig-node
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Fix PullImage and add corresponding node e2e test
Fixes#24101. This is a bug introduced by #23506, since ref #23563.
The root cause of #24101 is described [here](https://github.com/kubernetes/kubernetes/issues/24101#issuecomment-208547623).
This PR
1) Fixes#24101 by decoding the messages returned during pulling image, and return error if any of the messages contains error.
2) Add the node e2e test to detect this kind of failure.
3) Get present check out of `ConformanceImage.Remove()` and `ConformanceImage.Pull()`. Because sometimes we may expect error to occur in `PullImage()` and `RemoveImage()`, but even that doesn't happen, the `Present()` check will still return error and let the test pass.
@yujuhong @freehan @liangchenye
Also /cc @resouer, because he is doing the image related functions refactoring.
