无法从群集和主机内部与Docker容器连接

Question

I'm composing two containers, one with the web services and one with the database.
Here's my compose file:

version: '3.3'
services:
  web:
    image: microsoft/aspnetcore:1.1
    container_name: web
    ports:
    - 5555:80
    links:
    - db
  db:
    image: microsoft/mssql-server-linux:rc1
    container_name: db
    ports:
    - 1533:1433
    environment:
    - "ACCEPT_EULA=Y"
    - "MSSQL_SA_PASSWORD=MyAdminPwd2017"
    - "MSSQL_PID=Developer"

So, from my asp.net core app running in the web service I can access the database at db just using db as hostname. But db is not visible from the host (I have a default bridge network). I do can access my database from the host if I inspect the running db container and find it's ip address, then I can connect to <ip>,1533 .

The thing is, the file storing the the credentials to access the database is used both by the web container and the host machine. So I need a way to name db so I can access from both worlds (being inside the swarm and outside, from my host machine)

Is there a way to achieve that? I tried defining a host network in my docker-compose file and have both services uses that network, but I got a message saying only I one host network can be defined.

EDIT: tried to improve the question title but I'm still not convinced, improvements are welcome

Answer 1

Ok, so, to answer my own question, what I want is not posible, at least as of today.

Somebody wrote a nice article on why I can't achieve what I want. Having said that, it is doable in Windows Containers, but it might be a temporary "limitation".

Link to the post: https://derickbailey.com/2016/08/29/so-youre-saying-docker-isnt-a-virtual-machine/ and link to the Docker Forum: https://forums.docker.com/t/access-dockerized-services-via-the-containers-ip-address/21151