Vapor + PostgreSQL + Nginx build on Docker not operation properly - vapor

Question

I use docker to compose Vapor, PostgreSQL and Nginx for a project, my docker-compose.yml like this:
version: "3.6"
services:
vapor:
build:
context: ./vapor
image: ${CURRENT_VAPOR_IMG}
ports:
- 8080:8080
volumes:
- ${HOST_ROOT}:${CONTAINER_ROOT}
working_dir: ${CONTAINER_ROOT}
tty: true
entrypoint: bash
networks:
- x-net
nginx:
build:
context: ./nginx
image: ${CURRENT_NGINX_IMG}
ports:
- ${HOST_HTTP_PORT}:80
volumes:
- ${HOST_ROOT}:${CONTAINER_ROOT}
networks:
- x-net
psql:
image: ${CURRENT_DB_IMG}
ports:
- 5432:5432
environment:
- POSTGRES_DB=xxx
- POSTGRES_USER=xxx
- POSTGRES_PASSWORD=pass
volumes:
- ~/x/x-db:/var/lib/postgresql/data
networks:
- x-net
networks:
x-net:
driver: bridge
After I start all the container by running docker-compose up, then enter to vapor's container to build && run the project, it will prompt an error to the console:
NIO.ChannelError.connectFailed(NIO.NIOConnectionError(host: "localhost", port: 5432, dnsAError: nil, dnsAAAAError: nil, connectionErrors: [NIO.SingleConnectionFailure(target: [IPv6]localhost/::1:5432, error: connection reset (error set): Connection refused (errno: 61)), NIO.SingleConnectionFailure(target: [IPv4]localhost/127.0.0.1:5432, error: connection reset (error set): Connection refused (errno: 61))]))
Then I run the vapor project on local machine and keep the psql container running, it works normally, such as finished the first migration with models.
Is there any mistakes on my configuration of docker or any others?

Answer 1

To connect to database inside container dont use localhost as a db host but your db container name. So in your case host is psql. Here your docker compose is not well formatted psql and nginx must have one tab more. But maybe its just SO formatting wrong.

Answer 2

You can not have localhost in docker compose, host for your db is psql in this case.