Configuring firewall settings for Docker Swarm on Digital Ocean - linux

Question

How can I configure my digital ocean boxes to have the correct firewall settings?
I've followed the official guide for getting Digital Ocean and Docker containers working together.
I have 3 docker nodes that I can see when I docker-machine ls. I have created a master docker node and have joined the other docker nodes as workers. However, if I attempt to visit the url of the node, the connection hangs. This setup is working on local.
Here is my docker-compose that I am using for production.
version: "3"
services:
api:
image: "api"
command: rails server -b "0.0.0.0" -e production
depends_on:
- db
- redis
deploy:
replicas: 3
resources:
cpus: "0.1"
memory: 50M
restart_policy:
condition: on-failure
env_file:
- .env-prod
networks:
- apinet
ports:
- "3000:3000"
client:
image: "client"
depends_on:
- api
deploy:
restart_policy:
condition: on-failure
env_file:
- .env-prod
networks:
- apinet
- clientnet
ports:
- "4200:4200"
- "35730:35730"
db:
deploy:
placement:
constaints: [node.role == manager]
restart_policy:
condition: on-failure
env_file: .env-prod
image: mysql
ports:
- "3306:3306"
volumes:
- ~/.docker-volumes/app/mysql/data:/var/lib/mysql/data
redis:
deploy:
placement:
constaints: [node.role == manager]
restart_policy:
condition: on-failure
image: redis:alpine
ports:
- "6379:6379"
volumes:
- ~/.docker-volumes/app/redis/data:/var/lib/redis/data
nginx:
image: app_nginx
deploy:
restart_policy:
condition: on-failure
env_file: .env-prod
depends_on:
- client
- api
networks:
- apinet
- clientnet
ports:
- "80:80"
networks:
apinet:
driver: overlay
clientnet:
driver: overlay
I'm pretty confident that the problem is with the firewall settings. I'm not sure however, the ports that need to be open though. I've consulted this guide.