Liveness Test

A simple liveness test.

$ cat liveness.sh

#!/bin/bash
status="ok"
while :
do
    res=$(curl -sL -w "%{http_code}\\n" $1 -o /dev/null)
    expeced="200"
    date=`date +%Y-%m-%d_%H:%M:%S`

    if [ "$res" == "$expeced" ];
    then
        echo -e "$date \t $res \t ok"
        status="ok"
    else 
        echo -e "$date \t $res \t error"

        if [ "$status" == "ok" ];
        then
            $2
        fi
        status="error"
    fi
sleep 2
done

Call it via:

./liveness.sh http://localhost:3000 ./handle_server_down.sh

Deploy on Raspberry Pi or a server.