Mapping ports in docker-compose file doesn't work. Network unreachable - docker

Question

I'm trying to map a port from my container, to a port on the host following the docs but it doesn't appear to be working.
After I run docker-compose -f development.yml up --force-recreate I get no errors. But if I try to reach the frontend service using localhost:8081 the network is unreachable.
I used docker inspect to view the IP and tried to ping that and still nothing.
Here is the docker-compose file I am using. And I doing anything wrong?
development.yml
version: '3'
services:
frontend:
image: nginx:latest
ports:
- "8081:80"
volumes:
- ./frontend/public:/var/www/html
api:
image: richarvey/nginx-php-fpm:latest
ports:
- "8080:80"
restart: always
volumes:
- ./api:/var/www/html
environment:
APPLICATION_ENV: development
ERRORS: 1
REMOVE_FILES: 0
links:
- db
- mq
db:
image: mariadb
restart: always
volumes:
- ./data:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: dEvE10pMeNtMoDeBr0
mq:
image: rabbitmq:latest
restart: always
environment:
RABBITMQ_DEFAULT_USER: developer
RABBITMQ_DEFAULT_PASS: dEvE10pMeNtMoDeBr0

Answer 1

You are using docker toolbox. Docker toolbox uses docker machine. In Windows with docker toolbox, you are running under a virtualbox with its own IP, so localhost is not where your containers live. You will need to go 192.168.99.100:8081 to find your frontend.
As per the documentation on docker machine(https://docs.docker.com/machine/get-started/#run-containers-and-experiment-with-machine-commands):
$ docker-machine ip default
192.168.99.100