networking - Issue with docker compose db2-express c -

i'm trying set environment developing projects. need websphere container , db2 container. commit own version of containers in repo, using single command docker-compose start entire environment. docker-compose.yml is

version: '2' services:  web:   image: <my_user>/websphere-liberty-of-mine   ports:   - "80:9080"   - "443:9443"  db:   image: <my_user>/db2-of-mine   ports:   - "50000:50000"  environment:  - db2inst1_password=***  - license=accept 

the web container starts , stay running correclty, instead db db2 container starts , stops, message is:

changing password user db2inst1. passwd: authentication tokens updated successfully. new password: retype new password: 

how start alse db db2 container normally?
furthermore how can explitely set network , ip addresses 2 containers if docker-compose version is

$ docker-compose version docker-compose version 1.7.1, build 0a9ab35 docker-py version: 1.8.1 cpython version: 2.7.11 openssl version: openssl 1.0.2d 9 jul 2015