Default scheduler rules

Identify if a node has adequate hardware resources
Check if a node is running out of resources. check for memory or disk pressure conditions
Check if a pod schedule is scheduled to a node by a name
Check if a node has a label matching node selector in a pod spec
Check if a pod is requesting to bound to a specific host port and if so, does the node have that port available
Check if a pod is requesting a certain type of volume be mounted and if other pods are using the same volume
Check if a pod tolerates taints of the node, eg. master nodes is tainted with "noSchedule"
Check if a pod or a node affinity rules and checking if scheduling the pod would break these rules
If there is more than one node could schedule a pod, the scheduler priorities the nodes and choose the best one. If they have the same priority it chooses in round-robin fashion.

Kubernetes/Scheduling