Cannot connect to postico from docker-compose postgresql service - postgresql

Question

I've done a docker-compose up and been able to run my web service attached to a postgresql image. Problem is, I can't view the data on postico when I try to access the database. The name of the image is db and when i try to specify hostname to be "db" on postico before i connect, i get an error saying hostname not found. I've entered my credentials, port and database name the same way i keyed them in my docker-compose file.
Does anybody know how i can find the correct setup to connect to within the container?
version: '3.6'
services:
phoenix:
# tell docker-compose which Dockerfile it needs to build
build:
context: .
dockerfile: Dockerfile.phoenix.development
# map the port of phoenix to the local dev port
ports:
- 4000:4000
# mount the code folder inside the running container for easy development
volumes:
- ./my_app:/app
# make sure we start mongodb when we start this service
# links:
# - db
depends_on:
- db
- redis
environment:
GOOGLE_CLIENT_ID: ${GOOGLE_CLIENT_ID}
GOOGLE_CLIENT_SECRET: ${GOOGLE_CLIENT_SECRET}
FACEBOOK_CLIENT_ID: ${FACEBOOK_CLIENT_ID}
FACEBOOK_CLIENT_SECRET: ${FACEBOOK_CLIENT_SECRET}
POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
POSTGRES_USER: ${POSTGRES_USER}
go:
build:
context: .
dockerfile: Dockerfile.go.development
ports:
- 8080:8080
volumes:
- ./genesys-api:/go/src/github.com/sc4224/genesys-api
depends_on:
- db
- redis
- phoenix
db:
container_name: db
image: postgres:latest
ports:
- "5432:5432"
environment:
POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
POSTGRES_USER: ${POSTGRES_USER}
volumes:
- ./data/db:/data/db
restart: always
redis:
container_name: redis
image: redis:latest
ports:
- "6379:6379"
volumes:
- ./data/redis:/data/redis
entrypoint: redis-server
restart: always

Answer 1

use hostname as localhost.
You can't use the hostname db outside the internal docker network. That would work in the applications running in the same network.
Since you exposed the db to run on port 5432, it's exposed via 0.0.0.0:5432->5432/tcp and therefore is accessible with localhost as host and port 5432