Script to wait for localhost service in bash, with retries

await.sh

#!/usr/bin/env bash

set -euo pipefail

TRIES=0
until [ $TRIES -eq 10 ] || nc -z localhost 3000; do
    sleep 0.1

    TRIES=$(( TRIES+1 ))
done

if [[ $TRIES -gt 9 ]]
then
    echo "Failed to connect to container..."
    exit 999
else
    echo "Container started!"
fi