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Add support for limiting grace period during soft eviction
Adds eviction manager support in kubelet for max pod graceful termination period when a soft eviction is met.
```release-note
Kubelet evicts pods when available memory falls below configured eviction thresholds
```
/cc @vishh
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Add support for PersistentVolumeClaim in Attacher/Detacher interface
The attach detach interface does not support volumes which are referenced through PVCs. This PR adds that support
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Only expose top N images in `NodeStatus`
Fix#25209
Sorted the image and only pick set top 50 sized images in node status.
cc @vishh
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Updaing QoS policy to be at the pod level
Quality of Service will be derived from an entire Pod Spec, instead of being derived from resource specifications of individual resources per-container.
A Pod is `Guaranteed` iff all its containers have limits == requests for all the first-class resources (cpu, memory as of now).
A Pod is `BestEffort` iff requests & limits are not specified for any resource across all containers.
A Pod is `Burstable` otherwise.
Note: Existing pods might be more susceptible to OOM Kills on the node due to this PR! To protect pods from being OOM killed on the node, set `limits` for all resources across all containers in a pod.
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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
Check docker's pid file, then fallback to pidof when trying to determine the pid for docker. The
latest docker RPM for RHEL changes /usr/bin/docker from an executable to a shell script (to support
/usr/bin/docker-current and /usr/bin/docker-latest). The pidof check for docker fails in this case,
so we check /var/run/docker.pid first (the default location), and fallback to pidof if that fails.
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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.
This patch adds the --exit-on-lock-contention flag, which must be used
in conjunction with the --lock-file flag. When provided, it causes the
kubelet to wait for inotify events for that lock file. When an 'open'
event is received, the kubelet will exit.
When the IP isn't in the internal map, GetPodNetworkStatus() needs
to call the execer for the 'nsenter' program. That means the execer
needs to be !nil, which it wasn't before.
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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.
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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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If a pod has not printed anything to stdout/stderr, it's expected
behaviour to get `-- No entries --`, even when requesting json output.
Prior to this change, a warning would be printed in such an occasion.
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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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Make IsQualifiedName return error strings
Part of the larger validation PR, broken out for easier review and merge.
@lavalamp FYI, but I know you're swamped, too.
