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yfix/k8s-cluster-resources.sh

Forked from geerlingguy/k8s-cluster-resources.sh
Created September 12, 2019 12:08
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  1. @geerlingguy geerlingguy created this gist Feb 27, 2019.
    41 changes: 41 additions & 0 deletions k8s-cluster-resources.sh
    View file
    Original file line number Diff line number Diff line change
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    #!/bin/bash
    #
    # Monitor overall Kubernetes cluster utilization and capacity.
    #
    # Original source:
    # https://github.com/kubernetes/kubernetes/issues/17512#issuecomment-367212930
    #
    # Tested with:
    # - AWS EKS v1.11.5
    #
    # Does not require any other dependencies to be installed in the cluster.

    set -e

    KUBECTL="kubectl"
    NODES=$($KUBECTL get nodes --no-headers -o custom-columns=NAME:.metadata.name)

    function usage() {
    local node_count=0
    local total_percent_cpu=0
    local total_percent_mem=0
    local readonly nodes=$@

    for n in $nodes; do
    local requests=$($KUBECTL describe node $n | grep -A3 -E "\\s\sRequests" | tail -n2)
    local percent_cpu=$(echo $requests | awk -F "[()%]" '{print $2}')
    local percent_mem=$(echo $requests | awk -F "[()%]" '{print $8}')
    echo "$n: ${percent_cpu}% CPU, ${percent_mem}% memory"

    node_count=$((node_count + 1))
    total_percent_cpu=$((total_percent_cpu + percent_cpu))
    total_percent_mem=$((total_percent_mem + percent_mem))
    done

    local readonly avg_percent_cpu=$((total_percent_cpu / node_count))
    local readonly avg_percent_mem=$((total_percent_mem / node_count))

    echo "Average usage: ${avg_percent_cpu}% CPU, ${avg_percent_mem}% memory."
    }

    usage $NODES