Access mysql db inside docker container from outside - mysql

Question

I'm learning to use docker to make my development easier but I'm still failing access mysql.
Here is my docker-compose.yaml:
version: '3.3'
services:
# Database
db:
image: mysql:latest
ports:
- '3306:3306'
volumes:
- db_data:/var/lib/mysql
restart: always
environment:
MYSQL_ROOT_PASSWORD: password
MYSQL_DATABASE: dev1
MYSQL_USER: root
MYSQL_PASSWORD: password
networks:
- wpsite
# Wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
ports:
- '8000:80'
restart: always
volumes: ['./:/var/www/html']
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_USER: root
WORDPRESS_DB_PASSWORD: password
WORDPRESS_DB_NAME: dev1
networks:
- wpsite
networks:
wpsite:
volumes:
db_data:
Wordpress is running without difficulties which means that mysql must be alright too. I'm on Linux and trying to connect database via mysql workbench. It appears that connection is also ok expect for, there is no schema and so no wordpress tables.
I tried to add also phpmyadmin into docker-compose.yaml:
phpmyadmin:
depends_on:
- db
image: phpmyadmin/phpmyadmin
restart: always
ports:
- '8080:80'
environment:
PMA_HOST: db
MYSQL_ROOT_PASSWORD: password
networks:
- wpsite
but here I get following error after attempt to access db:
What I miss?
EDIT:
here is overview of running containers:

Answer 1

So i modified your docker-compose , with 2 small changes , and i dont have a issue .
I created a user for wordpress ( userdev1 ) in mysql .
The root is already here and can have some restrictions for remote access .
Via phpmyadmin i can login with userdev1 or root
You want a network access with the root account you must set this variable
MYSQL_ROOT_HOST .
You can find more information on this page (
https://dev.mysql.com/doc/mysql-installation-excerpt/5.7/en/docker-mysql-more-topics.html#docker_var_mysql-root-host )
version: '3.3'
services:
# Database
db:
image: mysql:5.7
ports:
- '3306:3306'
volumes:
- db_data:/var/lib/mysql
restart: always
environment:
MYSQL_ROOT_PASSWORD: password4root
MYSQL_DATABASE: dev1
MYSQL_USER: userdev1
MYSQL_PASSWORD: password4dev1
networks:
- wpsite
# Wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
ports:
- '8000:80'
restart: always
volumes: ['./:/var/www/html']
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_USER: userdev1
WORDPRESS_DB_PASSWORD: password4dev1
WORDPRESS_DB_NAME: dev1
networks:
- wpsite
phpmyadmin:
depends_on:
- db
image: phpmyadmin/phpmyadmin
restart: always
ports:
- '8080:80'
environment:
PMA_HOST: db
networks:
- wpsite
networks:
wpsite:
volumes:
db_data:
** UPDATED **
With the very last version of mysql docker image ( aka mysql 8.0 ),
you must change the default-authentification to mysql_native_password to be comptatible with legacy mysql client
source :
https://dev.mysql.com/doc/mysql-installation-excerpt/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password
image: mysql:latest
command: --default-authentication-plugin=mysql_native_password