Docker-compose doesn't persist volumes - docker

Question

I'm having a problem persisting data with docker-compose.
I want my service chatmysql to persist data I put inside a database, but everytime i run docker-compose down it all vanishes.
I checked directory /var/lib/docker/volumes to see if it stores data there when containers are running and the volume was completely empty.
I didn't have that issue when I was running containers with docker run command so I guess its fault of my docker-compose.yaml file. Can someone help me?
I'm running this on Ubuntu 20.04.
version: '3'
services:
chatmysql:
image: mysql/mysql-server
container_name: chatmysql
hostname: db
user: root
networks:
- chatnet
ports:
- 3307:3306
volumes:
- chatmysqlvolume:/lib/var/mysql
chatbackend:
depends_on:
- chatmysql
build:
context: backend/src
container_name: chatbackend
hostname: backend
networks:
- chatnet
ports:
- 8080:8080
environment:
- MYSQLUSERNAME=${MYSQLUSERNAME:-user}
- MYSQLPASSWORD=${MYSQLPASSWORD:?database password not set}
- MYSQLHOST=${MYSQLHOST:-db}
- MYSQLPORT=${MYSQLPORT:-3306}
- MYSQLDBNAME=${MYSQLDBNAME:-test}
restart: always
deploy:
restart_policy:
condition: on-failure
chatfrontend:
build: frontend
container_name: chatfrontend
hostname: front
networks:
- chatnet
ports:
- 3000:3000
volumes:
chatmysqlvolume:
networks:
chatnet:
driver: bridge

Answer 1

You need to change the mounted volume, try this :
version: '3.7'
services:
chatmysql:
image: mysql/mysql-server
container_name: chatmysql
hostname: db
user: root
networks:
- chatnet
ports:
- 3307:3306
volumes:
- chatmysqlvolume:/var/lib/mysql
chatbackend:
depends_on:
- chatmysql
build:
context: backend/src
container_name: chatbackend
hostname: backend
networks:
- chatnet
ports:
- 8080:8080
environment:
- MYSQLUSERNAME=${MYSQLUSERNAME:-user}
- MYSQLPASSWORD=${MYSQLPASSWORD:?database password not set}
- MYSQLHOST=${MYSQLHOST:-db}
- MYSQLPORT=${MYSQLPORT:-3306}
- MYSQLDBNAME=${MYSQLDBNAME:-test}
restart: always
deploy:
restart_policy:
condition: on-failure
chatfrontend:
build: frontend
container_name: chatfrontend
hostname: front
networks:
- chatnet
ports:
- 3000:3000
volumes:
chatmysqlvolume:
networks:
chatnet:
driver: bridge