Docker postgres 9.4 password authentication failed for user "postgres" - postgresql

Question

I am running very basic docker-compose with following docker-compose.yml and getting following error.
docker-compose.yml
services:
redis:
image: redis
db:
image: postgres:9.4
environment:
- POSTGRES_USER=udcoker
- POSTGRES_PASSWORD=udcoker
- POSTGRES_DB=docker
vote:
image: voting-app
ports:
- 5000:80
depends_on:
- redis
worker:
image: worker-app
depends_on:
- redis
- db
environment:
- POSTGRES_USER=udcoker
- POSTGRES_PASSWORD=udcoker
- POSTGRES_DB=docker
result:
image: result-app
ports:
- 5001:80
depends_on:
- db
environment:
- POSTGRES_USER=udcoker
- POSTGRES_PASSWORD=udcoker
- POSTGRES_DB=docker
Error generated,
db_1 | vacuuming database template1 ... ok
db_1 | copying template1 to template0 ... ok
db_1 | copying template1 to postgres ... ok
db_1 | syncing data to disk ...
db_1 | WARNING: enabling "trust" authentication for local connections
db_1 | You can change this by editing pg_hba.conf or using the option -A, or
db_1 | --auth-local and --auth-host, the next time you run initdb.
db_1 | ok
db_1 |
db_1 | Success. You can now start the database server using:
db_1 |
db_1 | postgres -D /var/lib/postgresql/data
db_1 | or
db_1 | pg_ctl -D /var/lib/postgresql/data -l logfile start
db_1 |
db_1 | waiting for server to start....LOG: database system was shut down at 2021-03-03 12:45:13 UTC
db_1 | LOG: MultiXact member wraparound protections are now enabled
db_1 | LOG: database system is ready to accept connections
db_1 | LOG: autovacuum launcher started
worker_1 | Waiting for db
result_1 | Waiting for db
db_1 | done
db_1 | server started
db_1 | CREATE DATABASE
db_1 |
db_1 |
db_1 | /usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*
db_1 |
db_1 | LOG: received fast shutdown request
db_1 | LOG: aborting any active transactions
db_1 | LOG: autovacuum launcher shutting down
db_1 | waiting for server to shut down....LOG: shutting down
db_1 | LOG: database system is shut down
worker_1 | Waiting for db
result_1 | Waiting for db
db_1 | done
db_1 | server stopped
db_1 |
db_1 | PostgreSQL init process complete; ready for start up.
db_1 |
db_1 | LOG: database system was shut down at 2021-03-03 12:45:15 UTC
db_1 | LOG: MultiXact member wraparound protections are now enabled
db_1 | LOG: database system is ready to accept connections
db_1 | LOG: autovacuum launcher started
db_1 | FATAL: password authentication failed for user "postgres"
db_1 | DETAIL: Connection matched pg_hba.conf line 95: "host all all all md5"
db_1 | FATAL: password authentication failed for user "postgres"
db_1 | DETAIL: Connection matched pg_hba.conf line 95: "host all all all md5"
I checked on various stackoverflow existing questions but none of them are rectifying actual issue. Some suggesting to run postgres docker and bash it to update the password but its a workaround. Anyone has any concrete solution to this?

Answer 1

I figured it out finally and would be good to share what mistake I had done.
I changed the database configuration by providing environment variable in the docker-compose.yml file in db service as mentioned in the question already,
environment:
- POSTGRES_USER=udcoker
- POSTGRES_PASSWORD=udcoker
- POSTGRES_DB=docker
But the same needs to be updated in all the other custom services (open source github) which are trying to connect to this depende-on postgres database with same user/password/database which was not done.
However the error given by docker-compose is not explaining the situation clearly.
In All, I updated the applications with above username/password/database in connection property and the containers are up.