Use bash socket to check for host/port connection

is_node_reachable.sh

#!/bin/bash

function ping_host ()
{
    {
        exec 4<>/dev/tcp/$1/$2
        if [ $? -ne '0' ]; then
            echo "Port not reachable"
            return 1;
        else
            return 0;
        fi
    } 1>&2 2>/dev/null
}

main ()
{
    ping_host $1 $2
}

main "$@"