How do I set up linkage between Docker containers so that restarting won't break it?

Question

I have a few Docker containers running like:

• Nginx
• Web app 1
• Web app 2
• PostgreSQL

Since Nginx needs to connect to the

Answer 1

You may use dockerlinks with names to solve this.

Most basic setup would be to first create a named database container :

$ sudo docker run -d --name db training/postgres

then create a web container connecting to db :

$ sudo docker run -d -P --name web --link db:db training/webapp python app.py

With this, you don't need to manually connect containers with their IP adresses.