While deploying the deployment manifest, we found that some of the critical pods are not getting scheduled whereas others are getting scheduled easily. Now, I wanted to make sure that the critical pod gets scheduled first over other pods. I started exploring pod scheduling and then came across one of the native solutions for Pod Scheduling using Pod Priority & Priority Class. So in this blog, we’ll talk about Priority Class & Pod Priority and how we can use them for pod scheduling.
Pod Priority
It determines the importance of a pod over another pod. It is most helpful when we need to schedule the critical pods, which are unable to schedule due to resource capacity issues.
Priority Class
It is a non-namespace object. It is used to define the priority. Priority Class objects can have any 32-bit integer value smaller than or equal to 1 billion. The higher the value, the higher will be the priority.
Pod Preemption
It allows the higher-priority pods to evict the lower-priority pods so that higher-priority pods can be scheduled, which is by default enabled when we create PriorityClass.
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