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hatem ben tayeb
hatem ben tayeb

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Bash: writing a simple pod checker

#kubernetes #bash #linux #funny

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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