Laravel dockerized app taking DB_HOST as SERVER_ADDR instead of container - mysql

Question

I have a laravel app and the database containers are configured in this way:
db:
image: "mysql:5.7"
command: ["--sql- mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"]
environment:
MYSQL_DATABASE: mydb
MYSQL_ALLOW_EMPTY_PASSWORD: 'yes'
volumes:
- db_data:/var/lib/mysql
restart: unless-stopped
networks:
- simple_net
app:
build:
context: .
dockerfile: ./setup/Dockerfile
restart: unless-stopped
tty: true
ports:
- "${APP_PORT}:80"
working_dir: /var/www/
volumes:
- ./:/var/www/
environment:
DB_CONNECTION: mysql
DB_HOST: db
DB_DATABASE: mydb
DB_USERNAME: root
# SERVER_ADDR: localhost
When I tried to start the app with docker-compose up it throws an exception that says SQLSTATE[HY000] [1045] Access denied for user 'root'#'172.23.0.6' (using password: NO). The IP refers to the environmental variable SERVER_ADDR, I tried to set it up with the values localhost and '' (empty) but nothing has worked so far.

Answer 1

You should set the .env's DB_HOST to the name of your container, in your case db.
DB_HOST=db
I do not believe injecting environment variables replaces filling the .env.
Also, if you want to Dockerize your Laravel applications, several options already exist and work out of the box:
Laradock
Docker Compose Laravel
Laradose (which I maintain)

Answer 2

You don't need DB_CONNECTION: mysql there.
Instead inside your .env file in lavel you will use this like:
DB_CONNECTION: mysql
DB_HOST: db
DB_PORT: 3306
DB_DATABASE: mydb
DB_USERNAME: root
DB_PASSWORD: password
Your app container does not need this environment, that's your server running. You try to configure the environment of the db container inside server container which will run your app.
Change your docker-compose to:
db:
image: "mysql:5.7"
command: ["--sql- mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"]
environment:
MYSQL_ROOT_USER: root
MYSQL_ROOT_PASSWORD: password
MYSQL_DATBASE: mydb
MYSQL_USER: root
MYSQL_PASSWORD: password
SERVICE_TAGS: dev
SERVICE_NAME: mysql
volumes:
- db_data:/var/lib/mysql
restart: unless-stopped
networks:
- simple_net
app:
build:
context: .
dockerfile: ./setup/Dockerfile
restart: unless-stopped
tty: true
ports:
- "${APP_PORT}:80"
working_dir: /var/www/
volumes:
- ./:/var/www/
networks:
- simple_net
Bridge your containers under your network so they can interact with each other.
Run docker-compose up --build and then access your laravel container and run inside the container php artisan optimize to configure cache for routes,env variables, files etc etc.
docker exec -it db mysql -u root -p password
Based on your comments you have issues to access the container and the reason is you don't use credentials for it and mysql tries to use the default ones. Above command defines the right user and password, you will also be asked to fill the password.
Also mysql has more parameters to define the host etc etc you can have a look further for that.