How to solve Laravel cant connect with mysql through docker - php

Question

Im trying to deploy my laravel app using docker. Then I created docker-compose.yml file and Dockerfile like below.
docker-compose.yml
version: "3.7"
services:
app:
build:
args:
user: sammy
uid: 1000
context: ./
dockerfile: Dockerfile
image: travellist
container_name: travellist-app
restart: unless-stopped
working_dir: /var/www/
volumes:
- ./:/var/www
networks:
- travellist
db:
image: mysql:8.0
container_name: travellist-db
restart: unless-stopped
environment:
MYSQL_DATABASE: '${DB_DATABASE}'
MYSQL_ROOT_PASSWORD: '${DB_PASSWORD}'
MYSQL_PASSWORD: '${DB_PASSWORD}'
MYSQL_ALLOW_EMPTY_PASSWORD: 1
SERVICE_TAGS: dev
SERVICE_NAME: mysql
volumes:
- ./docker-compose/mysql:/docker-entrypoint-initdb.d
networks:
- travellist
nginx:
image: nginx:alpine
container_name: travellist-nginx
restart: unless-stopped
ports:
- 8000:80
volumes:
- ./:/var/www
- ./docker-compose/nginx:/etc/nginx/conf.d/
networks:
- travellist
networks:
travellist:
driver: bridge
Dockerfile
FROM php:7.4-fpm
# Arguments defined in docker-compose.yml
ARG user
ARG uid
# Install system dependencies
RUN apt-get update && apt-get install -y \
git \
curl \
libpng-dev \
libonig-dev \
libxml2-dev \
zip \
unzip
# Clear cache
RUN apt-get clean && rm -rf /var/lib/apt/lists/*
# Install PHP extensions
RUN docker-php-ext-install pdo_mysql mbstring exif pcntl bcmath gd
# Get latest Composer
COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
# Create system user to run Composer and Artisan Commands
RUN useradd -G www-data,root -u $uid -d /home/$user $user
RUN mkdir -p /home/$user/.composer && \
chown -R $user:$user /home/$user
# Set working directory
WORKDIR /var/www
USER $user
And when I try docker-compose up, all the containers run with a any error. And also when I run docker-compose ps, it shows like this,
Name Command State Ports
------------------------------------------------------------------------------------------------
travellist-app docker-php-entrypoint php-fpm Up 9000/tcp
travellist-db docker-entrypoint.sh mysqld Up 3306/tcp, 33060/tcp
travellist-nginx /docker-entrypoint.sh ngin ... Up 0.0.0.0:8000->80/tcp,:::8000->80/tcp
But, when laravel application, tries to connect with mysql, it doesnt happens. And even I cant connect using TablePlus, it shows this.
Lost connection to MySQL server at 'waiting for initial communication packet', system error: 10060
And sometimes, I get like below,
SQLSTATE[HY000] [1045] Access denied for user 'root'#'192.168.48.3' (using password: YES)
How can I fix this ??

Answer 1

Since you're networking the services, you only need to expose the port 3306/tcp (this is the default port mysql serves). This makes it inaccessible from 0.0.0.0 but accessible from your nginx and app container.
I have also added the correct volume to persist data (which I am assuming is what you're trying to do). I moved mysql to latest - feel free to rollback or stick to 8 if you really? need too.
db:
image: 'mysql:latest'
restart: 'unless-stopped'
expose:
- '3306'
environment:
- 'MYSQL_RANDOM_ROOT_PASSWORD=true'
- 'MYSQL_DATABASE=${DB_DATABASE}'
- 'MYSQL_USER=${DB_USER}'
- 'MYSQL_PASSWORD=${DB_PASSWORD}'
- 'MYSQL_ALLOW_EMPTY_PASSWORD=true'
volumes:
- 'laravel-database:/var/lib/mysql/'
networks:
- 'travellist'
volumes:
laravel-database:
Further reading can be found on the Docker hub under mysql.
Inside your Laravel .env, you should connect to the container via its DNS.
DB_HOST=db
If you want to connect to this container externally, you'll need to bind the port to the server. Do so by replacing expose with the following:
ports:
- '3306:3306'