Hi Guys,

This is a general question:
I have the following setup:

• 2 Droplets (one for production and the other for development)
• Nginx (for reverse proxy ~ I have to subdomains api-dev and api that redirects to the respectively droplet)
• Node.js Application (running as a daemon with pm2)
• MongoDB

Right now the application is working as expected (Node.js and MongoDB on the same droplets), when I need to deploy a new change to production, basically i do the following steps:

• Move to the application directory
• git pull the changes (from master)
• pm2 restart api (restart daemon)

Right now is very simple the process, I want to learn better ways (practices) to do it. So, I have a few question:

I have read a little about docker (but still don't get it):
How can I benefit from docker?
Should I have an image for Node.js and another for MongoDB? (or just one with Node.js app and MongoDB installation)?
Right now, If I add another droplet I need to modify the nginx, is there a way to automated?
How can integrate the load balancer with nginx?
Is it better to have the MongoDB in a separate droplet? (why or why not?)

*Please share any best practice about Deployments