kubectl_total_resources.sh

#!/usr/bin/env bash

ceiling_divide() {
  echo $((($1+$2-1)/$2))
}

die () {
    echo >&2 "$@"
    exit 1
}

[ "$#" -eq 1 ] || die "1 argument required, $# provided"

case $1 in
   'requests')
      ;;
   'limits')
      ;;
   *) die "Only works for requests or limits"
esac


res=$(kubectl get pods -o=jsonpath='{.items[*]..resources.$1.memory}' -A)
let total=0
for i in $res
do

   if [[ $i == ?(-)+([0-9]) ]]
   then
      multiplier=0
   else
      suffix=${i: -2}
      case $suffix in
         'Ki')
            multiplier=1
            ;;
         'Mi')
            multiplier=2
            ;;
         'Gi')
            multiplier=3
            ;;
         *)
            die "bad suffix $suffix"
            ;;
      esac
   fi
   value=$(echo $i | sed 's/[^0-9]*//g')
   multiplier=$((1024 ** multiplier))
   value=$((value*multiplier))
   # echo "value=$value multiplier=$multiplier"
   total=$((total+value))
done
gibibyte=$((1024 ** 3))
echo $(ceiling_divide $total $gibibyte) "GiB RAM (exactly $total bytes)"

res=$(kubectl get pods -o=jsonpath='{.items[*]..resources.$1.cpu}' -A)
let tot=0
for i in $res
do
   if [[ $i =~ "m" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i ))
   else
      tot=$(( tot + i*1000 ))
   fi
done

echo $(ceiling_divide $tot 1000) "cores (exactly $tot milicores)"

Domyślny bash w macos:

 $ ./kubectl_total_resources.sh limits
./kubectl_total_resources.sh: line 28: syntax error in conditional expression: unexpected token `('
./kubectl_total_resources.sh: line 28: syntax error near `?(-'
./kubectl_total_resources.sh: line 28: `   if [[ $i == ?(-)+([0-9]) ]]'

Bash z brew nie ma tego problemu i dlatego wolę używać env w shebangu.

#!/usr/bin/env bash

Widać, że ze mnie żaden apple fanboy 😅Słuszna uwaga, dzięki!