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Implement node Allocatable

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Add `kube-reserved` and `system-reserved` flags for configuration
reserved resources for usage outside of kubernetes pods. Allocatable is
provided by the Kubelet according to the formula:
```
Allocatable = Capacity - KubeReserved - SystemReserved
```

Also provides a method for estimating a reasonable default for
`KubeReserved`, but the current implementation probably is low and needs
more tuning.
This commit is contained in:
Tim St. Clair
2015-12-11 17:51:39 -08:00
parent 8f401fb0d5
commit e2ffd007f7
7 changed files with 123 additions and 11 deletions
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4
docs/admin/kubelet.md
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@@ -100,6 +100,7 @@ kubelet
--image-gc-low-threshold=80: The percent of disk usage before which image garbage collection is never run. Lowest disk usage to garbage collect to. Default: 80%
--kube-api-burst=10: Burst to use while talking with kubernetes apiserver
--kube-api-qps=5: QPS to use while talking with kubernetes apiserver
--kube-reserved=: A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs that describe resources reserved for kubernetes system components. Currently only cpu and memory are supported. See http://releases.k8s.io/HEAD/docs/user-guide/compute-resources.html for more detail. [default=none]
--kubeconfig="/var/lib/kubelet/kubeconfig": Path to a kubeconfig file, specifying how to authenticate to API server (the master location is set by the api-servers flag).
--log-flush-frequency=5s: Maximum number of seconds between log flushes
--low-diskspace-threshold-mb=256: The absolute free disk space, in MB, to maintain. When disk space falls below this threshold, new pods would be rejected. Default: 256
@@ -138,12 +139,13 @@ kubelet
--streaming-connection-idle-timeout=5m0s: Maximum time a streaming connection can be idle before the connection is automatically closed. Example: '5m'
--sync-frequency=1m0s: Max period between synchronizing running containers and config
--system-container="": Optional resource-only container in which to place all non-kernel processes that are not already in a container. Empty for no container. Rolling back the flag requires a reboot. (Default: "").
--system-reserved=: A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs that describe resources reserved for non-kubernetes components. Currently only cpu and memory are supported. See http://releases.k8s.io/HEAD/docs/user-guide/compute-resources.html for more detail. [default=none]
--tls-cert-file="": File containing x509 Certificate for HTTPS. (CA cert, if any, concatenated after server cert). If --tls-cert-file and --tls-private-key-file are not provided, a self-signed certificate and key are generated for the public address and saved to the directory passed to --cert-dir.
--tls-private-key-file="": File containing x509 private key matching --tls-cert-file.
--volume-plugin-dir="/usr/libexec/kubernetes/kubelet-plugins/volume/exec/": <Warning: Alpha feature> The full path of the directory in which to search for additional third party volume plugins
```
###### Auto generated by spf13/cobra on 11-Jan-2016
###### Auto generated by spf13/cobra on 12-Jan-2016
<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->