Mastering Kubernetes - Second Edition

Configuring the scheduler

The scheduler algorithm is provided as part of the configuration. Custom schedulers can implement the ScheduleAlgorithm interface:

type ScheduleAlgorithm interface { 
    Schedule(*v1.Pod, NodeLister) (selectedMachine string, err error) 
    Preempt(*v1.Pod, NodeLister, error) (selectedNode *v1.Node,  
                                         preemptedPods []*v1.Pod,  
                                         cleanupNominatedPods []*v1.Pod,  
                                         err error) 
    Predicates() map[string]FitPredicate 
    Prioritizers() []PriorityConfig 
} 

When you run the scheduler, you can provide the name of the custom scheduler or a custom algorithm provider as a command-line argument. If none are provided, the default algorithm provider will be used. The command-line arguments to the scheduler are --algorithm-provider and --scheduler-name ...