Docker PHP and MySQL ERROR: php_network_getaddresses: getaddrinfo failed: [duplicate] - php

Question

I have docker installed on ubuntu machine and I'm trying to run a laravel app.
MySQL service has service_name: mysql in docker-compose.yml file and .env file has DB_HOST=mysql.
As I remember .env file should figure out that DB_HOST=mysql points to the mysql docker service IP. However this isn't happening and after running migrations I get:
Illuminate\Database\QueryException : SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution (SQL: SHOW FULL TABLES WHERE table_type = 'BASE TABLE')
First I ran docker-compose build, after which I ran docker-compose up -d and all of my 3 services are up and running.
If I extract the IP of MySQL service and use it in .env file like this:
DB_HOST=172.18.0.2
I can then run migrations successfully and in this case everything works fine.
However, I consider this as bad practice since IP address could be changed if MySQL service is restarted. Am I missing something here, why using service_name in my .env file for DB_HOST fails resolving db host name?
docker-compose.yml:
version: '3'
networks:
laravel:
services:
nginx:
image: nginx:stable-alpine
container_name: nginx
ports:
- "8080:80"
volumes:
- ./src:/var/www/html
- ./nginx/default.conf:/etc/nginx/conf.d/default.conf
depends_on:
- php
- mysql
networks:
- laravel
mysql:
image: mysql:5.7.22
container_name: mysql
restart: unless-stopped
tty: true
ports:
- "3306:3306"
volumes:
- ./mysql:/var/lib/mysql
environment:
MYSQL_DATABASE: laraone
MYSQL_USER: laraone_user
MYSQL_PASSWORD: secret
MYSQL_ROOT_PASSWORD: secret
SERVICE_TAGS: dev
SERVICE_NAME: mysql
networks:
- laravel
php:
build:
context: .
dockerfile: Dockerfile
container_name: php
volumes:
- ./src:/var/www/html
depends_on:
- mysql
ports:
- "9000:9000"
networks:
- laravel
.env:
APP_NAME=Laraone
APP_ENV="local"
APP_KEY=base64:PMwGrcSu2ioPEj75dv5gcdWAogESOtt8UCr/gs0nOtw=
APP_DEBUG=true
APP_URL=http://localhost:8080
LOG_CHANNEL=stack
DB_CONNECTION=mysql
DB_HOST=mysql
DB_PORT=3306
DB_DATABASE=laraone
DB_USERNAME=laraone_user
DB_PASSWORD=secret
BROADCAST_DRIVER=log
CACHE_DRIVER=file
SESSION_DRIVER=file
QUEUE_DRIVER=sync
REDIS_HOST=127.0.0.1
REDIS_PASSWORD=
REDIS_PORT=6379
MAIL_DRIVER=smtp
MAIL_HOST=mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=
MAIL_PASSWORD=
MAIL_ENCRYPTION=
MAIL_FROM_ADDRESS=noreply#example.com
MAIL_FROM_NAME="${APP_NAME}"
MAIL_SENDMAIL="/usr/sbin/sendmail -bs"

Answer 1

I think you try to run "php artisan migrate" command outside php docker container.
You should run php artisan migrate command inside php container.
Try following;
docker ps --> list running containers
docker exec -it <your_container_id> bash
and now you can run;
php artisan migrate
Edit:
You can also write artisan command without entering container bash as following;
docker exec -i <your_container_id> php artisan migrate

Answer 2

For anyone still wanting a dockerized Laravel enviroment, check out Laravel Sail. It lets you route commands to the docker instance easily with an alias sail. Like sail artisan migrate.
https://laravel.com/docs/8.x/sail
Laravel Sail is a light-weight command-line interface for interacting
with Laravel's default Docker development environment. Sail provides a
great starting point for building a Laravel application using PHP,
MySQL, and Redis without requiring prior Docker experience.

Answer 3

I resolved the issue by installing laravel app inside a php container. Simple 1-line command which helped me solve this problem: docker exec -it php php artisan app:install

Answer 4

Similar issue, with console command I created, with docker containers to mysql and php
(just entrypoint for dev runnig php artisan serve --host 0.0.0.0)
and I tried to run on host
php artisan my:console:command
which return :
SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution (SQL: select * from `mytable` limit 5)
By running :
docker exec -it myPhpContainerName php artisan my:console:command
it works fine

Answer 5

SOLUTION 1:
Always run docker ps to check if your ports are well mapped. below you can see what I mean.
to fix this you need to check if you have another instance of MySQL running with this port number and stop it or try a different port
SOLUTION 2:
change your credentials to
DB_CONNECTION=mysql
DB_HOST=mysql
DB_PORT=3306
DB_DATABASE=homestead
DB_USERNAME=root
DB_PASSWORD=
here is mysql yml