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robscott / kube-capacity

A simple CLI that provides an overview of the resource requests, limits, and utilization in a Kubernetes cluster
Apache License 2.0
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Option to calculate percentages according to requests/limits #67

Open varac opened 2 years ago

varac commented 2 years ago

Hi, first of all for this super useful plugin, it's exactly what I was missing for some time!

In order to reduce the memory footprint of apps on my cluster I'd like to tune memory requests and like to propose an option that calculates the mem metrics not according to the total node memory, but according to the requests/limits (same should be possible with CPU metrics, but my focus is on memory). Right now kube-capacity shows 2% mem usage of the total node memory:

❯ kubectl resource-capacity --pods --util --sort mem.util | grep -E '(NODE|kustom)'
NODE        NAMESPACE      POD                                        CPU REQUESTS   CPU LIMITS   CPU UTIL    MEMORY REQUESTS   MEMORY LIMITS   MEMORY UTIL
bitrigger   flux-system    kustomize-controller-7dd58878b8-7jmnb      100m (2%)      0Mi (0%)     3m (0%)     64Mi (3%)         1024Mi (51%)    49Mi (2%)

What I'd be interested in is the percentage of i.e. the mem requests (which is what k9s shows in the default pod list), which is actually 77%:

│ NAMESPACE↑     NAME                                     PF   READY     RESTARTS STATUS       CPU   MEM   %CPU/R    %CPU/L    %MEM/R    %MEM/L IP             NODE          AGE       │
│ flux-system    kustomize-controller-7dd58878b8-7jmnb    ●    1/1              0 Running        3    50        3       n/a        78         4 10.42.0.38     bitrigger     3h4m

So a flag could be --percentage=[node|req|limit] which could apply to both CPU and mem metrics.

michel-numan commented 7 months ago

This would be beneficial