Docker runs PostgreSQL in "trust" mode - postgresql

Question

I am currently learning docker and trying to run a docker container with the PostgreSQL database. I managed that once, and everything seemed to work fine. After some time, I tried to run another docker container with almost identical settings, however, it didn't go as expected. My problem is that now, whenever I try to run PostgreSQL container, initdb initializes the database in "trust" mode and accepts any connections without the password.
So far, I've tried running the command from the console:
docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -p 32000:5432 -d postgres:14.5-alpine
As well as running the docker-compose.yaml:
services:
db:
container_name: Test_container
image: postgres:14.5-alpine
restart: unless-stopped
ports:
- "32000:5432"
environment:
POSTGRES_USER: postgres
POSTGRES_PASSWORD: mysecretpassword
Additionally, I tried ordering tags differently, different images, and different values, cleaning docker: removing all containers, images, and volumes, and even reinstalling docker, however, whenever I inspect logs of a newly created container, I get:
sh: locale: not found
2022-08-16 09:35:50.709 UTC [30] WARNING: no usable system locales were found
performing post-bootstrap initialization ... ok
initdb: warning: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.
syncing data to disk ... ok
One of my assumptions was that docker, for some reason, doesn't see the password I am specifying and thus starts the database in "trust" mode, however, if I add
environment:
POSTGRES_USER: postgres
POSTGRES_PASSWORD: postgres
POSTGRES_DB: test_db
to the docker-compose.yaml, test_db database is being created.
I'd appreciate any suggestions on how to make docker run PostgreSQL containers not in a "trust" mode as it should by default if the password is specified.
Juan González pointed out:
Note 1: The PostgreSQL image sets up trust authentication locally so you may notice a password is not required when connecting from localhost (inside the same container). However, a password will be required if connecting from a different host/container.
So, according to the docs, I updated my docker-compose.yaml file:
environment:
POSTGRES_USER: postgres
POSTGRES_PASSWORD: postgres
POSTGRES_DB: test_db
POSTGRES_HOST_AUTH_METHOD: scram-sha-256
POSTGRES_INITDB_ARGS: --auth-host=scram-sha-256
and once again tried swapping order and\or removing POSTGRES_INITDB_ARGS, but database still runs in "trust" mode.

Answer 1

As stated in Postgres' DockerHub documentation:
Note 1: The PostgreSQL image sets up trust authentication locally so you may notice a password is not required when connecting from localhost (inside the same container). However, a password will be required if connecting from a different host/container.
However, if you don't want trust mode even in local connections, you can set the POSTGRES_HOST_AUTH_METHOD environment variable to override this behavior. More info at the documentation mentioned above.

Answer 2

As #jjanes pointed out in the comment to my question, the solution is to add POSTGRES_INITDB_ARGS: --auth=scram-sha-256 which would set both local and host types of connections.