Simple Kubernetes Cluster Capacity Finder

• Written in Golang.
• Program takes CPU/Memory resources for Kubernetes objects (say pods), required number of replicas as inputs and tells if you can really get them scheduled on your Kubernetes cluster !!
• It makes use of Kubernetes client-go API library under the hood.

How to install/run

• Install go
• git clone https://github.com/AshutoshNirkhe/KubernetesClusterCapacity.git
• Create GOPATH directory e.g. "/opt/Kubernetes" : mkdir -p /opt/Kubernetes
• export GOPATH=/opt/Kubernetes
• cp -pR src /opt/Kubernetes
• cd /opt/Kubernetes/src/KubeAPI
• Download 'dep' (or yum install) if not present
• dep init
• Make sure ".kube/config" is present in home directory of your user or export KUBECONFIG path to wherever it is present.

Usage flags

  -cpuLimits string
        CPU Limits either in cores(2) or milicores(500m) (default "200m")
  -cpuRequests string
        CPU Requests either in cores(1) or milicores(250m) (default "100m")
  -kubeconfig string
        (optional) absolute path to the kubeconfig file (default "${HOME}/.kube/config")
  -memLimits string
        Memory limits either in GB(2) or milicores(500mb) (default "200mb")
  -memRequests string
        Memory requests either in GB(1) or milicores(250mb) (default "100mb")
  -replicas string
        No of pod replicas (default "1")

Sample run output

go run ClusterCapacity.go -cpuRequests=200m -cpuLimits=400m -memRequests=250mb -memLimits=500mb -replicas=10
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         Total possible replicas for the pod with required input specs : 1561
         So you can go ahead with deployment of 10 pod replicas in the Kubernetes cluster!!

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