wait for docker entrypoint

docker-entrypoint.sh

#!/bin/bash
set -e

wait_for () {
    NAME=$1; HOST=$2; PORT=$3;

    if [ -z "$HOST" ]; then
        echo "ERROR: $NAME env not set"
        exit 1
    fi

    until timeout 1 bash -c "cat < /dev/null > /dev/tcp/${HOST}/${PORT}"; do
        >&2 echo "Waiting for $NAME at \"${HOST}:${PORT}\"..."
        sleep 1
    done

    echo "$NAME is at up at \"${HOST}:${PORT}\""
}

wait_for "IS_UP_RABBIT_HOST" "$IS_UP_RABBIT_HOST" "5672"
wait_for "IS_UP_MONGO_HOST" "$IS_UP_MONGO_HOST" "27017"

# Run command
$@