README
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Congestion Agent: Scheduling based on node congestion
The Congestion agent scheduler extender together with a node annotator, which collects statistics about node congestion, provides a Kubernetes scheduling solution that is influenced by additional node congestion measure.
Description
This is an extender to a default Kubernetes scheduler which provides a priority function called 'congestion'. A node is continuously annotated with a value representing a form of congestion on the node. This may be due to measured load on the node and/or networking congestion in and out of the node. The key for the annotation is 'congestion-factor' and the value is an integer between zero and 100 (or another maximum value provided by the environment variable 'CONGESTION_FACTOR_MAX'). The higher the value the more congestion there is on the node. A missing congestion value means zero congestion. The intent of this priority function is to have the scheduler prefer nodes with low congestion values. In order to activate the 'congestion' priority function, one needs to add in the extender deployment file:
"prioritizeVerb": "priorities/congestion",
to the ConfigMap policy.cfg definition, under "extenders".
Documentation
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Index ¶
Constants ¶
const ( // CongestionFactorMax : environment variable to set maximum congestion factor CongestionFactorMax = "CONGESTION_FACTOR_MAX" // DefaultCongestionFactorMax : 100 DefaultCongestionFactorMax = 100 )
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- Environment variables and their default values
const (
// CongestionFactorKey : label for measure of node congestion [0 (no congesion) - max]
CongestionFactorKey = "congestion-factor"
)
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- Key labels
const (
// PriorityCongestionName : name of congestion priority function
PriorityCongestionName = "congestion"
)
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- Names of predicates and priority functions
Variables ¶
This section is empty.
Functions ¶
func PriorityFunc ¶
func PriorityFunc(pod v1.Pod, nodes []v1.Node) (*schedulerapi.HostPriorityList, error)
PriorityFunc : priority function based on node congestion factor
Types ¶
This section is empty.
Source Files