Linux script with curl to check recursively if web service is up

Question

I wanted to create a Linux script to check recursively if web service is up and if it is down then wait for sometime and check again.

I have written below script using curl which will check whether web service is up and if yes it will echo message and same with fail.

test_command='curl -sL \
    -w "%{http_code}\\n" \
    "http://www.google.com:8080/" \
    -o /dev/null \
    --connect-timeout 3 \
    --max-time 5'

if [ $(test_command) == "200" ] ; 
then
   echo "OK" ;
else
   echo "KO" ;
fi

I am trying now to add recursive code in else part so that if web service is not yet up after deployment then it will add some wait in else part and will check the status again after some seconds for that web service.

According your description I understand that you are looking for how to do [recursive functions in Bash](https://stackoverflow.com/a/9682813/6771046). — U880D, Aug 02 '19 at 07:02

U880D · Accepted Answer · 2023-02-09T11:33:09.557

In respect to the comment about recursive functions in Bash, I've created a small test and which seems to work at a first glance.

./conTest.sh

#! /bin/bash

  test_command()
  {

  http_code=$(curl -sL -x "http://localhost:3128" -w "%{http_code}\\n" "https://www.google.com/" -o /dev/null --connect-timeout 3 --max-time 5)

  if [ ${http_code} == "200" ] ;
  then
    echo "OK" ;
  else
    echo "KO" ;
    sleep 1 ; 
    test_command ;
  fi

  }

  test_command ;

Maybe one can provide a more elegant solution or has an other idea.

Linux script with curl to check recursively if web service is up

1 Answers1