Run 2 docker mysql containers simultaneously with docker-compose - mysql

Question

I need help setting up 2 mysql docker containers at the same time.
Right now I spin up my mysql docker container via docker-compose like this:
version: '3.3'
services:
db:
image: mysql:5.7
restart: always
environment:
MYSQL_DATABASE: my_database
MYSQL_USER: user
MYSQL_PASSWORD: ********
MYSQL_ROOT_PASSWORD: ********
MYSQL_ROOT_USER: root
ports:
# <Port exposed> : < MySQL Port running inside container>
- '3308:3306'
What I've tried is copy-pasting the docker-composse.yml into a different folder and changing it a little
version: '3.3'
services:
db:
image: mysql:5.7
restart: always
environment:
MYSQL_DATABASE: my_other_database
MYSQL_USER: user
MYSQL_PASSWORD: ********
MYSQL_ROOT_PASSWORD: ********
MYSQL_ROOT_USER: root
ports:
# <Port exposed> : < MySQL Port running inside container>
- '3310:3307'
I run docker-compose up for both of them and both start up normally. I can connect to port 3308 just fine but I cannot connect to port 3310. I get
Can not read response from server.
Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
How do I set up my docker-compose.yml files so I get 2 mysql containers that run simultaneously?

Answer 1

I think you have the wrong Port on the second config. Mysql runs on port 3306
Change 3310:3307 to 3310:3306.
The whole config:
version: '3.3'
services:
db:
image: mysql:5.7
restart: always
environment:
MYSQL_DATABASE: my_other_database
MYSQL_USER: user
MYSQL_PASSWORD: ********
MYSQL_ROOT_PASSWORD: ********
MYSQL_ROOT_USER: root
ports:
# <Port exposed> : < MySQL Port running inside container>
- '3310:3306'