Database created but no tables in MySQL Docker - mysql

Question

I have a Application run into a tomcat-embededd container and linked with a MySQL database
I have running my container by
docker-compose up --build -d
, the two container is up, i can log in to the application
But , when i put
docker exec -it myapp-mysql bash
and i choise my database with
use dbname;
, i don't see any table into my database
This is my docker-compose
version: "2"
services:
db:
container_name: myapp-mysql
image: mysql:latest
restart: always
ports:
- 3306:3306
environment:
MYSQL_ROOT_PASSWORD: XXXXXXXX
MYSQL_DATABASE: XXXXXXX
networks:
app_net:
ipv4_address: A.B.C.D
back-end-java:
container_name: myapp-tomcat
build:
context: .
dockerfile: Dockerfile
restart: always
image: application
ports:
- 8008:8443
links:
- db
networks:
app_net:
ipv4_address: A.B.C.D
networks:
app_net:
driver: bridge
ipam:
driver: default
config:
- subnet: A.B.C.D/24
gateway: A.B.C.D
and this is the Dockerfile
FROM tomcat:8.0.33-jre8
ADD myapp.war /usr/local/tomcat/webapps/
CMD ["catalina.sh", "run"]
Thank YOU

Answer 1

You are using --build which means you force the recreation of mysql container and since you are not mounting your data volume to the host machine, your data will be wiped out each time you run this command. you can avoid that by mounting mysql data volume to your docker-compose as the following:
version: "2"
services:
db:
container_name: myapp-mysql
image: mysql:latest
restart: always
ports:
- 3306:3306
volumes:
- "./data/mariadb:/var/lib/mysql:rw"
environment:
MYSQL_ROOT_PASSWORD: XXXXXXXX
MYSQL_DATABASE: XXXXXXX
networks:
app_net:
ipv4_address: A.B.C.D