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I am setting up a pod say test-pod on my google kubernetes engine. When I deploy the pod and see in workloads using google console, I am able to see 100m CPU getting allocated to my pod by default, but I am not able to see how much memory my pod has consumed. The memory requested section always shows 0 there. I know we can restrict memory limits and initial allocation in the deployment YAML. But I want to know how much default memory a pod gets allocated when no values are specified through YAML and what is the maximum limit it can avail?
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Each container has a limit of 0.5 CPU and 128MiB of memory. You can say the Pod has a request of 0.5 CPU and 128 MiB of memory, and a limit of 1 CPU and 256MiB of memory.
The default value is Always. The restartPolicy applies to all containers in the Pod. restartPolicy only refers to restarts of the containers by the kubelet on the same node. After containers in a Pod exit, the kubelet restarts them with an exponential back-off delay (10s, 20s, 40s, …), that is capped at five minutes.
Kubernetes uses memory requests to determine on which node to schedule the pod. For example, on a node with 8 GB free RAM, Kubernetes will schedule 10 pods with 800 MB for memory requests, five pods with 1600 MB for requests, or one pod with 8 GB for request, etc.
If you have no resource requests on your pod, it can be scheduled anywhere at all, even the busiest node in your cluster, as though you requested 0 memory and 0 CPU. If you have no resource limits and can consume all available memory and CPU on its node.
(If it’s not obvious, realistic resource requests and limits are a best practice!)
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