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I'm new to kubernetes. So I need some help with things, which are basic stuff for most of you. I build my first cluster and added some workers (bare metal).

How do I estimate how much resources/power I need for my apps? For example I'm using 10 different nextJS / node frontend applications and three nestJS backend applications, I really don't know which server dimension I have to choose. How much CPU and memory do I need? I know there is no exact answer for this, as you cannot know how complex each app is (although in my case they are all very simple). But I hope to get some infos from you how I can estimate or measure which resources are needed in my cluster. How do I see if I need to add another worker to the cluster?

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    Does this answer your question? Can you help me with my capacity planning?
    – Greg Askew
    Commented Jun 5, 2022 at 23:25
  • @GregAskew It helps and I know it is better to build a scalable system, that's why I'm using k8s. But how do I know the resources are not enough? How do I get this information? Then I could add another worker...
    – user3142695
    Commented Jun 6, 2022 at 10:16

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You can use utility command kubectl top ( node / pod) to get the resources metrics:

node          Display resource (CPU/memory) usage of nodes

pod           Display resource (CPU/memory) usage of pods

Also, you can deploy Prometheus in order to get the full metrics from your cluster.

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