Docker, referencing a different container. Call mysqldump using php command - php

Question

I've got a database backup bundle (https://github.com/dizda/CloudBackupBundle) installed on a Symfony3 project using Docker, but I can't get it to work due to it either not finding PHP or not finding MySQL
When I run php app/console --env=prod dizda:backup:start via exec, run, or via cron. I get mysqldump command not found error through the PHP image, or PHP not found error from the Mysql/db image.
How do I go about running a php command that then runs a mysqldump command.
My docker-compose file is as follows:
version: '2'
services:
web:
# image: nginx:latest
build: .
restart: always
ports:
- "80:80"
volumes:
- .:/usr/share/nginx/html
links:
- php
- db
- node
volumes_from:
- php
volumes:
- ./logs/nginx/:/var/log/nginx
php:
# image: php:fpm
restart: always
build: ./docker_setup/php
links:
- redis
expose:
- 9000
volumes:
- .:/usr/share/nginx/html
db:
image: mysql:5.7
volumes:
- "/var/lib/mysql"
restart: always
ports:
- 8001:3306
environment:
MYSQL_ROOT_PASSWORD: gfxhae671
MYSQL_DATABASE: boxstat_db_live
MYSQL_USER: boxstat_live
MYSQL_PASSWORD: GfXhAe^7!
node:
# image: //digitallyseamless/nodejs-bower-grunt:5
build: ./docker_setup/node
volumes_from:
- php
redis:
image: redis:latest
I'm pretty new to docker, so and easy improvements you can see feel free t flag...I'm in the trial and error stage!

Answer 1

Your image that has your code should have all the dependencies needed for your code to run.
In this case, your code needs mysqldump installed locally for it to run. I would consider this to be a dependency of your code.
It might make sense to add a RUN line to your Dockerfile that will install the mysqldump command so that your code can use it.
Another approach altogether would be to externalize the database backup process instead of leaving that up to your application. You could have some container that runs on a cron and does the mysqldump process that way.
I would consider both approaches to be clean.