Cannot psql into docker postgres image port forwarded locally - postgresql

Question

I'm continuously hitting an error when trying to psql into a docker composed postgres image that has its ports forwarded. (this issue seems to persist also when attempting to access the DB programatically via node application).
Running docker-compose up -d on the following docker compose file:
services:
postgres:
container_name: cnc-matches
image: postgres:12.1-alpine
ports:
- '5432:5432'
environment:
POSTGRES_USER: dbuser
POSTGRES_PASSWORD: pass
POSTGRES_DB: cnc-matches
When running psql to attempt to access it I hit the following error continuously:
C:\Users\danie\Desktop\dev\cnc-db\db-setup>psql -h "localhost" -p "5432" -U dbuser
Password for user dbuser: pass
psql: error: connection to server at "localhost" (::1), port 5432 failed: FATAL: password authentication failed for user "dbuser"
When running docker exec I'm able to access the table and info fine:
C:\Users\danie\Desktop\dev\cnc-db\db-setup>docker exec -it cnc-matches psql -U dbuser cnc-matches
psql (12.1)
Type "help" for help.
cnc-matches=# \du
List of roles
Role name | Attributes | Member of
-----------+------------------------------------------------------------+-----------
dbuser | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
I've tried creating a new user as well as altering the dbuser profiles passwords in here with ALTER PASSWORD dbuser WITH PASSWORD 'pass' and I still cannot access the db with default psql command locally.
cnc-matches=# CREATE USER tester WITH PASSWORD 'tester';
CREATE ROLE
cnc-matches=# \du
List of roles
Role name | Attributes | Member of
-----------+------------------------------------------------------------+-----------
dbuser | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
tester | | {}
C:\Users\danie\Desktop\dev\cnc-db\db-setup>psql -h "localhost" -p "5432" -U tester
Password for user tester: tester
psql: error: connection to server at "localhost" (::1), port 5432 failed: FATAL: password authentication failed for user "tester"
Not sure what it is I'm misisng here, if relevant running via windows 11 cmd.
Any help/suggestions appreciated.

Answer 1

Looks like you also need to include the database name when connecting to the database running in the Docker container, ex
psql -h "0.0.0.0" -p "5432" -U dbuser cnc-matches

Answer 2

If the container was successfully started, try running:
psql -U dbuser -d cnc-matches -h 0.0.0.0 --port 5432
For the port use whatever you mapped yours in the container to; in your case 5432.
You must specify all that explicitly or else you will get an error that the database cannot accept TCP/IP connections.

Answer 3

First time I am posting, sorry if there is wrong formatting.
I updated your docker-compose file with a network bridge as still isolated from the network with the host machine.
Steps:
"db-net" can be any name you want but both must coincide with your docker compose file
Create a docker network with: docker network create db-net
Run: docker-compose up -d
version: "3.9"
services:
postgresCNC:
container_name: cnc-matches
image: postgres:15.0-alpine
ports:
- '5432:5432'
environment:
POSTGRES_USER: dbuser
POSTGRES_PASSWORD: pass
POSTGRES_DB: cnc-matches
networks:
db-net:
networks:
db-net:
driver: bridge
Network bridge by default uses the hardware network device to communicate between containers and host machine as with containers with others containers.
More info here:
https://docs.docker.com/network/bridge/