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Bash: writing a simple pod checker

hatembentayeb profile image hatem ben tayeb ・2 min read

I was working with Kubernetes and I just want to check my pods in the current workspace, in a funny way 😅, I will use bash for just one reason, it's the Linux native languages no need for other languages and libraries

Actually, I was inspired by a cool tool called popeye, you can find it here.

Make sure you have Kubectl installed and an existing cluster as well, here is my implementation

  • Define your favorite colors
blanc="\033[1;37m"
gray="\033[0;37m"
magento="\033[0;35m"
red="\033[1;31m"
green="\033[1;32m"
amarillo="\033[1;33m"
azul="\033[1;34m"
rescolor="\e[0m"
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You can find more about colors in bash here.

  • Get list pods into an Array
listPods=$(kubectl get po | awk 'NR>1{print $1}')
#echo "$listPods"
readarray  arr <<<  $listPods
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NR>1 will skip the first line and print $1 will print the first words (separated by a space) on all lines.

  • Looping over the array and check the status
ok=0
notok=0
echo -e "\nSit Down and Wait  \U1F602 :\n"
for i in ${arr[@]}
do 
echo -ne "$i ... " 
status=$(kubectl get po $i | grep $i | awk '{print $3}')
    if [[ ! $status =~ ^Running$|^Completed$  ]]  ; then
        echo -e "\e[1;31mOh Shit !"$rescolor""
        notify-send "Pods Health" "$i was  FUCKED" -t 10000 
        let notok=notok+1
    else
        echo -e "\e[1;32mOK!"$rescolor""
        #notify-send "Pod $i Is Good :)"
      let ok=ok+1
    fi
done
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The ok and notok are used to count the number of the running/not running pods , the ${arr[@]} prints out the whole array, the notify-send will create a notification on your system is one of the pods are fked up** .

  • Print out the summary
echo -e "\nSTATS:\n"
echo "+---------------+---------------+"
printf  "|$green%-15s$rescolor|$red%-15s$rescolor|\n" "Healthy Pods" "Unhealthy Pods"
echo "+---------------+---------------+"
printf  "|%-15s|%-15s|\n" "$ok" "$notok"
echo "+---------------+---------------+"
echo -e "\n"
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  • Run the script

Download the scripts with CURL :

curl https://raw.githubusercontent.com/hatembentayeb/podschecker/master/podschecker.sh --output podschecker.sh
chmod +x podschecker.sh
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  • Demo

PodHealth.gif

Repository: https://github.com/hatembentayeb/podschecker
Original blog: https://hatembentayeb.hashnode.dev/bash-writing-a-simple-pod-checker

The scripts don't do much but it was a result of a boring 3 hours on this pandemic 🥲

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