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AWS: Move enforcement of attached AWS device limit from kubelet to scheduler
Limit of nr. of attached EBS volumes to a node is now enforced by scheduler. It can be adjusted by `KUBE_MAX_PD_VOLS` env. variable there. Therefore we don't need the same check in kubelet. If the system admin wants to attach more, we should allow it.
Kubelet limit is now 650 attached volumes ('ba'..'zz').
Note that the scheduler counts only *pods* assigned to a node. When a pod is deleted and a new pod is scheduled on a node, kubelet start (slowly) detaching the old volume and (slowly) attaching the new volume. Depending on AWS speed **it may happen that more than KUBE_MAX_PD_VOLS volumes are actually attached to a node for some time!** Kubelet will clean it up in few seconds / minutes (both attach/detach is quite slow).
Fixes#22994
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kube-apiserver options should be decoupled from impls
A few months ago we refactored options to keep it independent of the
implementations, so that it could be used in CLI tools to validate
config or to generate config, without pulling in the full dependency
tree of the master. This change restores that by separating
server_run_options.go back to its own package.
Also, options structs should never contain non-serializable types, which
storagebackend.Config was doing with runtime.Codec. Split the codec out.
Fix a typo on the name of the etcd2.go storage backend.
Finally, move DefaultStorageMediaType to server_run_options.
@nikhiljindal as per my comment in #24454, @liggitt because you and I
discussed this last time
Sometimes clients send unintelligible data to the server, provide a bit
more debugging in the returned error to make it easier to pin down where
the problem is from the user side.
Provides fast transformations of int64 scaled values with overflow to
inf.Dec as needed. Attempts to reduce allocations and expensive
operations in the critical path.
Alters the public signature of Quantity to encourage more efficient use
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Refactor persistent volume controller
Here is complete persistent controller as designed in https://github.com/pmorie/pv-haxxz/blob/master/controller.go
It's feature complete and compatible with current binder/recycler/provisioner. No new features, it *should* be much more stable and predictable.
Testing
--
The unit test framework is quite complicated, still it was necessary to reach reasonable coverage (78% in `persistentvolume_controller.go`). The untested part are error cases, which are quite hard to test in reasonable way - sure, I can inject a VersionConflictError on any object update and check the error bubbles up to appropriate places, but the real test would be to run `syncClaim`/`syncVolume` again and check it recovers appropriately from the error in the next periodic sync. That's the hard part.
Organization
---
The PR starts with `rm -rf kubernetes/pkg/controller/persistentvolume`. I find it easier to read when I see only the new controller without old pieces scattered around.
[`types.go` from the old controller is reused to speed up matching a bit, the code looks solid and has 95% unit test coverage].
I tried to split the PR into smaller patches, let me know what you think.
~~TODO~~
--
* ~~Missing: provisioning, recycling~~.
* ~~Fix integration tests~~
* ~~Fix e2e tests~~
@kubernetes/sig-storage
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Fixes#15632
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Make name validators return string slices
Part of the larger validation PR, broken out for easier review and merge. Builds on previous PRs in the series.
A few months ago we refactored options to keep it independent of the
implementations, so that it could be used in CLI tools to validate
config or to generate config, without pulling in the full dependency
tree of the master. This change restores that by separating
server_run_options.go back to its own package.
Also, options structs should never contain non-serializable types, which
storagebackend.Config was doing with runtime.Codec. Split the codec out.
Fix a typo on the name of the etcd2.go storage backend.
Finally, move DefaultStorageMediaType to server_run_options.
Automatic merge from submit-queue
Make IsValidLabelValue return error strings
Part of the larger validation PR, broken out for easier review and merge. Builds on previous PRs in the series.
- remove persistentvolume_ prefix from all files
- split controller.go into controller.go and controller_base.go (to have them
under 1500 lines for github)
This fixes e2e test for provisioning - it expects that provisioned volumes
are bound quickly.
Majority of this patch is update of test framework needs to initialize the
controller appropriately.
- Add reclaim policy to newVolume() call.
- Implement reactor Volumes().Get().
- Implement mock volume plugin.
- Add recycler tests.
- Add a synchronization condition to controller.scheduleOperation
- we need to pause the controller here, let the test to do some bad things
to the controller and test error cases in recycleVolumeOperation.
Test framework gets more and more complicated... But this is the last piece,
I promise.
We need to keep list of running recyclers, deleters and provisioners in
memory in order not to start a new recycling/deleting/provisioning twice
for the same volume/claim.
This will be eventually replaced by GoRoutineMap from PR #24838.
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Add init containers to pods
This implements #1589 as per proposal #23666
Incorporates feedback on #1589, creates parallel structure for InitContainers and Containers, adds validation for InitContainers that requires name uniqueness, and comments on a number of implications of init containers.
This is a complete alpha implementation.
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