SQLSTATE[HY000] [2002] Connection refused Laravel 5.6 and Laradock - laravel

Question

I have a problem with my database mysql. I can not access it, I have a laravel project which I added Laradock to be able to use the containers with Docker. I launched two containers typing docker-compose up -d mysql nginx in my laradock directory. Once the containers are launched, I can access Laravel's home page, but when I want to communicate with my database I have the following error:
SQLSTATE [HY000] [2002] Connection refused.
Someone has an idea of ​​the source of my problem. Thank you .
i am on ubuntu 17.10
Docker version 17.12.0-ce, build c97c6d6
my .env file in project is here
DB_CONNECTION=mysql
DB_HOST=mysql
DB_PORT=3306
DB_DATABASE=db_authors
DB_USERNAME=root
DB_PASSWORD=root
.env file on laradock folder is
MYSQL_VERSION=8.0
MYSQL_DATABASE=db_authors
MYSQL_USER=root
MYSQL_PASSWORD=root
MYSQL_PORT=3306
MYSQL_ROOT_PASSWORD=root
MYSQL_ENTRYPOINT_INITDB=./mysql/docker-entrypoint-initdb.d
and here is mysql container in my docker-compose.yml
mysql:
build:
context: ./mysql
args:
- MYSQL_VERSION=${MYSQL_VERSION}
environment:
- MYSQL_DATABASE=${MYSQL_DATABASE}
- MYSQL_USER=${MYSQL_USER}
- MYSQL_PASSWORD=${MYSQL_PASSWORD}
- MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
- TZ=${WORKSPACE_TIMEZONE}
volumes:
- ${DATA_SAVE_PATH}/mysql:/var/lib/mysql
- ${MYSQL_ENTRYPOINT_INITDB}:/docker-entrypoint-initdb.d
ports:
- "${MYSQL_PORT}:3306"
networks:
- backend
my containers are well launched here is the result I get by doing
docker-compose up -d mysql nginx
Creating network "laradock_default" with the default driver
Creating laradock_mysql_1 ... done
Creating network "laradock_backend" with driver "bridge"
Creating laradock_workspace_1 ... done
Creating laradock_applications_1 ...
Creating laradock_php-fpm_1 ... done
Creating laradock_php-fpm_1 ...
Creating laradock_nginx_1 ... do

Answer 1

try the following:
1 - Enter the MySQL container: docker-compose exec mysql bash.
2 - Enter mysql: mysql -uroot -proot
3 - See all users: SELECT User FROM mysql.user;
4 - Run any commands show databases, show tables, select * from......
Does it work? Can you log on MySQL like that?