Starts 5 SC instances for round robin load balancing and 1 for command relay. Relies on https://gist.github.com/mehmetg/9cdc77269ddef72ebc84

start_sc.sh

#!/usr/bin/env bash
#This script is intended to be run from the root of the sauce connect package.
SCBIN="bin/sc"
uname=$1
akey=$2
uname=$SAUCE_USERNAME
akey=$SAUCE_ACCESS_KEY
export tunnelId=$SAUCE_TUNNEL_ID
LOGPREFIX="/tmp"


function start_sauce_connect() {
    tunnelId=$1

    if [ -z "$2" ]; then
        port="4445"
    else
        port=$2
    fi

    echo "tunnel id: ${tunnelId}"
    echo "se port: ${port}"

    args="--user ${uname} \
          --api-key ${akey} \
          --shared-tunnel
    	  --max-logsize 524288000 \
          --se-port ${port} \
          --logfile ${LOGPREFIX}/sc_log_${tunnelId}_${port}.log \
          --pidfile ${LOGPREFIX}/sc_${tunnelId}_${port}.pid \
          --readyfile ${LOGPREFIX}/sc_${tunnelId}_${port}.rdy \
          --no-remove-colliding-tunnels \
          --wait-tunnel-shutdown \
	  --daemonize"

    if ! [ -z "$tunnelId" ]; then
        args="${args} --tunnel-identifier ${tunnelId}"
    fi

    echo $SCBIN $args
    $SCBIN $args
}

function is_tunnel_ready() {
    tunnelId=$1

    if [ -z "$2" ]; then
        port="4445"
    else
        port=$2
    fi
    ready_file="${LOGPREFIX}/sc_${tunnelId}_${port}.rdy"
    ctr=0
    while ! [[ -e "$ready_file" ]] && [[ $ctr -lt 10 ]];
    do
        echo "Waiting ${ctr}"
        echo "se port: ${port}"
        echo "tunnel id: ${tunnelId}"
        sleep 3
        let ctr=ctr+1
    done

    if [[ ctr -gt 9 ]]; then
        echo "Failed:"
        echo "se port: ${port}"
        echo "tunnel id: ${tunnelId}"
    else
        echo "Ready:"
        echo "se port: ${port}"
        echo "tunnel id: ${tunnelId}"
    fi
}

if ! [ -z "$uname" ]; then
    # echo $uname
    export SAUCE_USERNAME=$uname
    echo "Username supplied!"
else
    echo "No username supplied"
    exit 1
fi

if ! [ -z "$akey" ]; then
    # echo $akey
    export SAUCE_ACCESS_KEY=$akey
    echo "Access key supplied!"
else
    echo "No access key supplied"
    exit 1
fi

./stop_sc.sh
rm -rf ${LOGPREFIX}/sc*
#relay only
start_sauce_connect "command_relay_only" "4445"
is_tunnel_ready "command_relay_only" "4445"

for p in `seq 4446 4450`;
do
  start_sauce_connect "" $p
  sleep 1
done

for p in `seq 4446 4450`;
do
  is_tunnel_ready "" $p
  sleep 1
done