mysql in a separate docker container

Dockerfile

@@ -21,7 +21,22 @@ RUN echo "${SOURCE_REPO_URL}" >> /etc/apt/sources.list && \
     apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF && \
     locale-gen en_US.UTF-8 && \
     apt-get -y update && \
-    apt-get install --force-yes -yq software-properties-common wget curl cron rsyslog && \
+    apt-get install --force-yes -yq software-properties-common wget curl cron rsyslog gcc make && \
+    wget https://www.openssl.org/source/openssl-1.1.0f.tar.gz && \
+    tar xzvf openssl-1.1.0f.tar.gz && \
+    cd openssl-1.1.0f && \
+    ./config && \
+    make && \
+    sudo make install && \
+    cd .. && \
+    rm -f openssl-1.1.0f.tar.gz && \ wget https://www.openssl.org/source/openssl-1.1.0f.tar.gz && \
+    tar xzvf openssl-1.1.0f.tar.gz && \
+    cd openssl-1.1.0f && \
+    ./config && \
+    make && \
+    sudo make install && \
+    cd .. && \
+    rm -f openssl-1.1.0f.tar.gz && \
     wget http://nginx.org/keys/nginx_signing.key && \
     apt-key add nginx_signing.key && \
     echo "deb http://nginx.org/packages/mainline/ubuntu/ trusty nginx" >> /etc/apt/sources.list.d/nginx.list && \
@@ -47,4 +62,6 @@ VOLUME ["/var/lib/mysql"]
 
 EXPOSE 80 443 5222 3306 9865 9888 9866 9871 9882 5280
 
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 CMD ["/app/onlyoffice/run-community-server.sh"];

config/mysql/conf.d/onlyoffice.cnf

@@ -0,0 +1,4 @@
+[mysqld]
+sql_mode = 'NO_ENGINE_SUBSTITUTION'
+max_connections = 1000
+max_allowed_packet = 1048576000

docker-compose.yml

@@ -1,14 +1,43 @@
 version: '3'
 services:
+  onlyoffice-mysql-server:
+    container_name: onlyoffice-mysql-server
+    image: mysql:5.7
+    environment:
+     - MYSQL_ROOT_PASSWORD=my-secret-pw
+     - MYSQL_DATABASE=onlyoffice
+     - MYSQL_USER=onlyoffice_user
+     - MYSQL_PASSWORD=onlyoffice_pass 
+    networks:
+     - onlyoffice
+    stdin_open: true
+    tty: true
+    restart: always
+    volumes:
+     - ./config/mysql/conf.d:/etc/mysql/conf.d 
+     - mysql_data:/var/lib/mysql
   onlyoffice-community-server:
     container_name: onlyoffice-community-server
     image: onlyoffice/communityserver:latest
     depends_on:
+     - onlyoffice-mysql-server
      - onlyoffice-document-server
      - onlyoffice-mail-server
     environment:
      - MAIL_SERVER_DB_HOST=onlyoffice-mail-server
      - DOCUMENT_SERVER_PORT_80_TCP_ADDR=onlyoffice-document-server
+     - MYSQL_ROOT_PASSWORD=my-secret-pw
+     - MYSQL_SERVER_DB_NAME=onlyoffice 
+     - MYSQL_SERVER_HOST=onlyoffice-mysql-server 
+     - MYSQL_SERVER_USER=onlyoffice_user
+     - MYSQL_SERVER_PASS=onlyoffice_pass 
+     - MAIL_SERVER_API_PORT=8081
+     - MAIL_SERVER_API_HOST=onlyoffice-mail-server
+     - MAIL_SERVER_DB_HOST=onlyoffice-mysql-server
+     - MAIL_SERVER_DB_PORT=3306
+     - MAIL_SERVER_DB_NAME=onlyoffice_mailserver
+     - MAIL_SERVER_DB_USER=root
+     - MAIL_SERVER_DB_PASS=my-secret-pw
     networks:
      - onlyoffice
     ports:
@@ -19,7 +48,6 @@ services:
     tty: true
     restart: always
     volumes:
-     - community_mysql:/var/lib/mysql
      - community_data:/var/www/onlyoffice/Data
      - community_log:/var/log/onlyoffice
      - document_data:/var/www/onlyoffice/DocumentServerData
@@ -42,7 +70,15 @@ services:
   onlyoffice-mail-server:
     container_name: onlyoffice-mail-server
     image: onlyoffice/mailserver:latest
+    depends_on:
+     - onlyoffice-mysql-server
     hostname: ${MAIL_SERVER_HOSTNAME}
+    environment:
+       - MYSQL_SERVER=onlyoffice-mysql-server
+       - MYSQL_SERVER_PORT=3306
+       - MYSQL_ROOT_USER=root
+       - MYSQL_ROOT_PASSWD=my-secret-pw
+       - MYSQL_SERVER_DB_NAME=onlyoffice_mailserver
     networks:
       - onlyoffice
     restart: always
@@ -52,12 +88,10 @@ services:
     tty: true
     expose:
       - '8081'
-      - '3306'
     volumes:
       - mail_data:/var/vmail
       - mail_certs:/etc/pki/tls/mailserver
       - mail_log:/var/log
-      - mail_mysql:/var/lib/mysql
 networks:
   onlyoffice:
     driver: 'bridge'
@@ -65,9 +99,8 @@ volumes:
   mail_data:
   mail_certs:
   mail_log:
-  mail_mysql:
   document_data:
   document_log:
   community_data:
   community_log:
-  community_mysql:
+  mysql_data: