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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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6
cmd/kubelet/app/options/options.go
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@@ -108,6 +108,8 @@ type KubeletServer struct {
TLSCertFile string
TLSPrivateKeyFile string
ReconcileCIDR bool
SystemReserved util.ConfigurationMap
KubeReserved util.ConfigurationMap
// Flags intended for testing
// Is the kubelet containerized?
@@ -183,6 +185,8 @@ func NewKubeletServer() *KubeletServer {
SyncFrequency: 1 * time.Minute,
SystemContainer: "",
ReconcileCIDR: true,
SystemReserved: make(util.ConfigurationMap),
KubeReserved: make(util.ConfigurationMap),
KubeAPIQPS: 5.0,
KubeAPIBurst: 10,
ExperimentalFlannelOverlay: experimentalFlannelOverlay,
@@ -267,6 +271,8 @@ func (s *KubeletServer) AddFlags(fs *pflag.FlagSet) {
fs.BoolVar(&s.Containerized, "containerized", s.Containerized, "Experimental support for running kubelet in a container. Intended for testing. [default=false]")
fs.Uint64Var(&s.MaxOpenFiles, "max-open-files", s.MaxOpenFiles, "Number of files that can be opened by Kubelet process. [default=1000000]")
fs.BoolVar(&s.ReconcileCIDR, "reconcile-cidr", s.ReconcileCIDR, "Reconcile node CIDR with the CIDR specified by the API server. No-op if register-node or configure-cbr0 is false. [default=true]")
fs.Var(&s.SystemReserved, "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]")
fs.Var(&s.KubeReserved, "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]")
fs.BoolVar(&s.RegisterSchedulable, "register-schedulable", s.RegisterSchedulable, "Register the node as schedulable. No-op if register-node is false. [default=true]")
fs.Float32Var(&s.KubeAPIQPS, "kube-api-qps", s.KubeAPIQPS, "QPS to use while talking with kubernetes apiserver")
fs.IntVar(&s.KubeAPIBurst, "kube-api-burst", s.KubeAPIBurst, "Burst to use while talking with kubernetes apiserver")