Docker still deletes databases on rebuild

Question

I have some project in docker. When i recreating docker app, docker still deleting old databases in localhost. I did not find any solution on internet. Is there someone who knows how this problem solved?

Thanks for the responding

There is my docker file

FROM php:7.2-apache
ENV DOCKER=1
ENV MASTER_URL_DOCKERFILE='http://website/'
RUN docker-php-ext-install mysqli pdo_mysql
RUN apt-get update -y && apt-get install -y \
    libpng-dev \
    libwebp-dev \
    libjpeg62-turbo-dev \
    libpng-dev libxpm-dev \
    libfreetype6-dev
RUN docker-php-ext-configure gd \
    --with-gd \
    --with-webp-dir \
    --with-jpeg-dir \
    --with-png-dir \
    --with-zlib-dir \
    --with-xpm-dir \
    --with-freetype-dir

RUN docker-php-ext-install gd
RUN docker-php-ext-install calendar && docker-php-ext-configure calendar
RUN a2enmod rewrite
RUN ln -s /etc/apache2/mods-available/expires.load /etc/apache2/mods-enabled/
COPY core /var/www/core/
COPY chainway/src /var/www/html/
COPY chainway/docker/app/ /usr/local/bin/
RUN service apache2 restart

And there is how i running containers

#!/bin/bash

DIR=$(dirname $0)

cd $DIR

wget –V
wget -O "$DIR/docker/db/dump.sql" "http://website/senddatabasetolocalhost.php?auth=authkey"

docker-compose stop

docker-compose build
docker-compose up -d

Answer 1

You will have to use a volumes in docker-compose.yml like this:

volumes:
  - $PWD/my_sql:/var/lib/mysql

Answer 2

You can store your db data using volumes.

Add to your docker-compose.yml file in mysql section:

  mysql:
    volumes:
      - db_data:/var/lib/mysql

And to the end of the file:

volumes:
  db_data: