Save data generated from a Python app running in Docker swarms in Mysql Database

Question

I would like to run multiple instances of my Python app using Swarm in Docker, running on two raspberry Pi. The app communicates with a Mysql db. I would like to save all the data generated from the replicas in one common database but I cannot figure out what is the best way to do that. Should I use docker also for the database or should I try using a DB saved in one host? Any suggestion would be really appreciated!

Answer 1

You can use Docker to your DB or install it directly in the host machine, that's up to you. If you use Docker, make sure that you use a volume to store persistently your DB data.

Personally, I recommend you to install it in the host, but there are different opinions about that topic. Take a look to this Percona blog article: https://www.percona.com/blog/2016/11/16/is-docker-for-your-database/

You should take a look to Galera Cluster for MySql too ( http://galeracluster.com/products/ ). I think that you'd like to have your data replicated to guarantee high avaliability and improve safety of your data.

Hope this helps, good luck!