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@ -11,7 +11,7 @@ The purpose of filtering the nodes is to filter out the nodes that do not meet c
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- `PodFitsResources`: Check if the free resource (CPU and Memory) meets the requirement of the Pod. The free resource is measured by the capacity minus the sum of requests of all Pods on the node. To learn more about the resource QoS in Kubernetes, please check [QoS proposal](../design-proposals/resource-qos.md).
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- `PodFitsHostPorts`: Check if any HostPort required by the Pod is already occupied on the node.
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- `HostName`: Filter out all nodes except the one specified in the PodSpec's NodeName field.
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- `MatchNodeSelector`: Check if the labels of the node match the labels specified in the Pod's `nodeSelector` field and, as of Kubernetes v1.2, also match the `scheduler.alpha.kubernetes.io/affinity` pod annotation if present. See [here](../user-guide/node-selection/) for more details on both.
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- `MatchNodeSelector`: Check if the labels of the node match the labels specified in the Pod's `nodeSelector` field and, as of Kubernetes v1.2, also match the `scheduler.alpha.kubernetes.io/affinity` pod annotation if present. See [here](https://kubernetes.io/docs/user-guide/node-selection/) for more details on both.
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- `MaxEBSVolumeCount`: Ensure that the number of attached ElasticBlockStore volumes does not exceed a maximum value (by default, 39, since Amazon recommends a maximum of 40 with one of those 40 reserved for the root volume -- see [Amazon's documentation](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/volume_limits.html#linux-specific-volume-limits)). The maximum value can be controlled by setting the `KUBE_MAX_PD_VOLS` environment variable.
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- `MaxGCEPDVolumeCount`: Ensure that the number of attached GCE PersistentDisk volumes does not exceed a maximum value (by default, 16, which is the maximum GCE allows -- see [GCE's documentation](https://cloud.google.com/compute/docs/disks/persistent-disks#limits_for_predefined_machine_types)). The maximum value can be controlled by setting the `KUBE_MAX_PD_VOLS` environment variable.
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- `CheckNodeMemoryPressure`: Check if a pod can be scheduled on a node reporting memory pressure condition. Currently, no ``BestEffort`` should be placed on a node under memory pressure as it gets automatically evicted by kubelet.
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@ -34,7 +34,7 @@ Currently, Kubernetes scheduler provides some practical priority functions, incl
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- `SelectorSpreadPriority`: Spread Pods by minimizing the number of Pods belonging to the same service, replication controller, or replica set on the same node. If zone information is present on the nodes, the priority will be adjusted so that pods are spread across zones and nodes.
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- `CalculateAntiAffinityPriority`: Spread Pods by minimizing the number of Pods belonging to the same service on nodes with the same value for a particular label.
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- `ImageLocalityPriority`: Nodes are prioritized based on locality of images requested by a pod. Nodes with larger size of already-installed packages required by the pod will be preferred over nodes with no already-installed packages required by the pod or a small total size of already-installed packages required by the pod.
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- `NodeAffinityPriority`: (Kubernetes v1.2) Implements `preferredDuringSchedulingIgnoredDuringExecution` node affinity; see [here](../user-guide/node-selection/) for more details.
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- `NodeAffinityPriority`: (Kubernetes v1.2) Implements `preferredDuringSchedulingIgnoredDuringExecution` node affinity; see [here](https://kubernetes.io/docs/user-guide/node-selection/) for more details.
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The details of the above priority functions can be found in [plugin/pkg/scheduler/algorithm/priorities](http://releases.k8s.io/HEAD/plugin/pkg/scheduler/algorithm/priorities/). Kubernetes uses some, but not all, of these priority functions by default. You can see which ones are used by default in [plugin/pkg/scheduler/algorithmprovider/defaults/defaults.go](http://releases.k8s.io/HEAD/plugin/pkg/scheduler/algorithmprovider/defaults/defaults.go). Similar as predicates, you can combine the above priority functions and assign weight factors (positive number) to them as you want (check [scheduler.md](scheduler.md) for how to customize).
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