Docker multiple MYSQL containers - docker

Question

Docker newbie here.
What I'm trying to achieve is to run multiple MySQL containers with docker compose, in addition to an nginx, a PHP and a PhpMyAdmin container.
This is my docker-compose.yml:
version: '3'
services:
server:
build:
context: ./
dockerfile: server.docker
volumes:
- ./:/var/www
ports:
- "8080:80"
links:
- app
app:
build:
context: ./
dockerfile: app.docker
volumes:
- ./:/var/www
links:
- db_callcenter
- db_forecast
- db_logistics
- db_products
- db_rm
- db_rma
- db_settings
- db_tasks
- db_users
db_callcenter:
image: mysql:5.7
environment:
- "MYSQL_ROOT_PASSWORD=secret"
- "MYSQL_DATABASE=prj_callcenter"
ports:
- "33061:3306"
volumes:
- mysql_bkp:/var/lib/mysql
db_forecast:
image: mysql:5.7
environment:
- "MYSQL_ROOT_PASSWORD=secret"
- "MYSQL_DATABASE=prj_forecast"
ports:
- "33062:3306"
volumes:
- mysql_bkp:/var/lib/mysql
db_logistics:
image: mysql:5.7
environment:
- "MYSQL_ROOT_PASSWORD=secret"
- "MYSQL_DATABASE=prj_logistics"
ports:
- "33063:3306"
volumes:
- mysql_bkp:/var/lib/mysql
db_products:
image: mysql:5.7
environment:
- "MYSQL_ROOT_PASSWORD=secret"
- "MYSQL_DATABASE=prj_products"
ports:
- "33064:3306"
volumes:
- mysql_bkp:/var/lib/mysql
db_rm:
image: mysql:5.7
environment:
- "MYSQL_ROOT_PASSWORD=secret"
- "MYSQL_DATABASE=prj_rm"
ports:
- "33065:3306"
volumes:
- mysql_bkp:/var/lib/mysql
db_rma:
image: mysql:5.7
environment:
- "MYSQL_ROOT_PASSWORD=secret"
- "MYSQL_DATABASE=prj_rma"
ports:
- "33066:3306"
volumes:
- mysql_bkp:/var/lib/mysql
db_settings:
image: mysql:5.7
environment:
- "MYSQL_ROOT_PASSWORD=secret"
- "MYSQL_DATABASE=prj_settings"
ports:
- "33067:3306"
volumes:
- mysql_bkp:/var/lib/mysql
db_tasks:
image: mysql:5.7
environment:
- "MYSQL_ROOT_PASSWORD=secret"
- "MYSQL_DATABASE=prj_tasks"
ports:
- "33068:3306"
volumes:
- mysql_bkp:/var/lib/mysql
db_users:
image: mysql:5.7
environment:
- "MYSQL_ROOT_PASSWORD=secret"
- "MYSQL_DATABASE=prj_users"
ports:
- "33069:3306"
volumes:
- mysql_bkp:/var/lib/mysql
pma:
image: phpmyadmin/phpmyadmin
environment:
- "PMA_USER=root"
- "PMA_PASSWORD=secret"
ports:
- "8001:80"
links:
- db_callcenter
- db_forecast
- db_logistics
- db_products
- db_rm
- db_rma
- db_settings
- db_tasks
- db_users
volumes:
mysql_bkp:
But none of the MySQL containers are created. When I run docker ps I get:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0228e9c8a267 phpmyadmin/phpmyadmin "/run.sh phpmyadmin" About a minute ago Up 30 seconds 0.0.0.0:8001->80/tcp prj_pma_1
e6c6b11905f1 prj_server "nginx -g 'daemon ..." 22 minutes ago Up 2 minutes 0.0.0.0:8080->80/tcp prj_server_1
2e7dd484c6e5 prj_app "docker-php-entryp..." 24 minutes ago Up 2 minutes 9000/tcp prj_app_1
UPDATE:
docker logs shows:
Unable to lock ./ibdata1 error: 11
or
InnoDB: Unsupported redo log format.
I don't know what I'm doing wrong, or how I should start debugging. Any help would be mostly appreciated.

Answer 1

You can't have multiple mysql processes sharing the same data directory. In your compose file, every database container is using the same mysql_bkp volume. You will need to either create one volume per container, or configure mysql to use a unique subdirectory of /var/lib/mysql for storing data.
If you simply remove the volumes: key from each database service, they will all get a unique anonymous volume (because that's how the mysql image is configured).
Alternatively, you can declare and mount a separate volume for each service:
services:
db_logistics:
image: mysql:5.7
volumes:
- mysql_bkp_logistics:/var/lib/mysql
db_products:
image: mysql:5.7
volumes:
- mysql_bkp_products:/var/lib/mysql
volumes:
mysql_bkp_logistics:
mysql_bkp_products:
Etc.