I have a application that was running on windows communicating with posgres via postgres mappig localhost8080 to 5432 on postgres container
altought now I need to run everything on linux container, and I cant get to connect my api with postgres even if they were working before, so my question is
How can I do them to communicate with each other? How can I put them in the same network and organize commucation?
I need the elixir app to have all ports exposed to test tcp connections, so a simple intern redirect thing wouldnt work
my docker compose file

version: '3.9'

services:
  elixir_app:
    build:
      context: .
      dockerfile: Dockerfile
    deploy:
      resources:
        limits:
          memory: 25GB
          cpus: "12"
        reservations:
          memory: "0"
          cpus: "0"
    stdin_open: true
    tty: true
  postis:
    image: postgres
    container_name: postis
    environment:
      POSTGRES_PASSWORD: 12345
      POSTGRES_USER: pedri
    ports:
      - "5432:5432"
    volumes:
      - postgres_data:C:\Users\henri\Documents

volumes:
  postgres_data:

config

config :testespay, Testespay.Repo,
  log: false,
  database: "teste10",
  user: "pedri",
  password: "12345",
  hostname: "localhost",
  port: 5432

when I try to run this app container, I get the error

14:17:33.153 [error] Failure while translating Erlang's logger event
** (MatchError) no match of right hand side value: %{label: {:gen_statem, :terminate}, name: #PID<0.507.0>, reason: {:error, %KeyError{key: :username, term: [pool_index: 8, types: Postgrex.DefaultTypes, pool: DBConnection.ConnectionPool, repo: Testespay.Repo, telemetry_prefix: [:testespay, :repo], otp_app: :testespay, timeout: 15000, pool_size: 10, log: false, database: "teste10", user: "pedri", password: "12345", hostname: "localhost", port: 5431, show_sensitive_data_on_connection_error: true], message: nil}, [{Keyword, :fetch!, 2, [file: ~c"lib/keyword.ex", line: 602]}, {Postgrex.Protocol, :startup, 2, [file: ~c"lib/postgrex/protocol.ex", line: 833]}, {Postgrex.Protocol, :handshake, 3, [file: ~c"lib/postgrex/protocol.ex", line: 729]}, {Postgrex.Protocol, :connect_endpoints, 6, [file: ~c"lib/postgrex/protocol.ex", line: 209]}, {DBConnection.Connection, :handle_event, 4, [file: ~c"lib/db_connection/connection.ex", line: 74]}, {:gen_statem, :loop_state_callback, 11, [file: ~c"gen_statem.erl", line: 1397]}, {:proc_lib, :init_p_do_apply, 3, [file: ~c"proc_lib.erl", line: 241]}]}, log: [], state: Postgrex.Protocol, queue: [internal: {:connect, :init}], modules: [DBConnection.Connection], client_info: :undefined, callback_mode: :handle_event_function, postponed: [], timeouts: {0, []}, state_enter: false}
    (logger 1.17.0) lib/logger/translator.ex:306: Logger.Translator.report_gen_statem_terminate/2
    (logger 1.17.0) lib/logger/utils.ex:47: Logger.Utils.translate/5
    (logger 1.17.0) lib/logger/utils.ex:25: Logger.Utils.translator/2
    (kernel 9.2.2) logger_backend.erl:101: :logger_backend.do_apply_filters/4
    (kernel 9.2.2) logger_backend.erl:86: :logger_backend.apply_filters/4
    (kernel 9.2.2) logger_backend.erl:32: :logger_backend.log_allowed/3
    (stdlib 5.2.1) gen_statem.erl:2591: :gen_statem.terminate/7
    (stdlib 5.2.1) proc_lib.erl:241: :proc_lib.init_p_do_apply/3

14:17:33.150 [error] Failure while translating Erlang's logger event
** (MatchError) no match of right hand side value: %{label: {:gen_statem, :terminate}, name: #PID<0.509.0>, reason: {:error, %KeyError{key: :username, term: [pool_index: 2, types: Postgrex.DefaultTypes, pool: DBConnection.ConnectionPool, repo: Testespay.Repo, telemetry_prefix: [:testespay, :repo], otp_app: :testespay, timeout: 15000, pool_size: 10, log: false, database: "teste10", user: "pedri", password: "12345", hostname: "localhost", port: 5431, show_sensitive_data_on_connection_error: true], message: nil}, [{Keyword, :fetch!, 2, [file: ~c"lib/keyword.ex", line: 602]}, {Postgrex.Protocol, :startup, 2, [file: ~c"lib/postgrex/protocol.ex", line: 833]}, {Postgrex.Protocol, :handshake, 3, [file: ~c"lib/postgrex/protocol.ex", line: 729]}, {Postgrex.Protocol, :connect_endpoints, 6, [file: ~c"lib/postgrex/protocol.ex", line: 209]}, {DBConnection.Connection, :handle_event, 4, [file: ~c"lib/db_connection/connection.ex", line: 74]}, {:gen_statem, :loop_state_callback, 11, [file: ~c"gen_statem.erl", line: 1397]}, {:proc_lib, :init_p_do_apply, 3, [file: ~c"proc_lib.erl", line: 241]}]}, log: [], state: Postgrex.Protocol, queue: [internal: {:connect, :init}], modules: [DBConnection.Connection], client_info: :undefined, callback_mode: :handle_event_function, postponed: [], timeouts: {0, []}, state_enter: false}
    (logger 1.17.0) lib/logger/translator.ex:306: Logger.Translator.report_gen_statem_terminate/2
    (logger 1.17.0) lib/logger/utils.ex:47: Logger.Utils.translate/5
    (logger 1.17.0) lib/logger/utils.ex:25: Logger.Utils.translator/2
    (kernel 9.2.2) logger_backend.erl:101: :logger_backend.do_apply_filters/4
    (kernel 9.2.2) logger_backend.erl:86: :logger_backend.apply_filters/4
    (kernel 9.2.2) logger_backend.erl:32: :logger_backend.log_allowed/3
    (stdlib 5.2.1) gen_statem.erl:2591: :gen_statem.terminate/7
    (stdlib 5.2.1) proc_lib.erl:241: :proc_lib.init_p_do_apply/3

the network info around
1-> the network container
2-> postgres container

"Networks": {
			"host": {
				"IPAMConfig": null,
				"Links": null,
				"Aliases": null,
				"MacAddress": "",
				"DriverOpts": null,
				"NetworkID": "1ea463e456351180d5d16950cc6c451dc7a64e9a030901f04c141f9f49808176",
				"EndpointID": "41f016f6a0ac589e0dfa29f0e0c371fe055797edf2e24e7f013430406a1930c4",
				"Gateway": "",
				"IPAddress": "",
				"IPPrefixLen": 0,
				"IPv6Gateway": "",
				"GlobalIPv6Address": "",
				"GlobalIPv6PrefixLen": 0,
				"DNSNames": null
			}

"Networks": {
			"fpay_default": {
				"IPAMConfig": null,
				"Links": null,
				"Aliases": [
					"postiscompose",
					"postiscompose"
				],
				"MacAddress": "02:42:ac:12:00:02",
				"DriverOpts": null,
				"NetworkID": "7b5a170b04b96013cf9f2ddc635cd64af162dc58bef6c078a2e3b6a52e468083",
				"EndpointID": "0fe7f9fbc7aa503bd4e8fc64cd8241f688b3873765a82cc7a8e0c73520657ca1",
				"Gateway": "172.18.0.1",
				"IPAddress": "172.18.0.2",

so I tried running the app with a docker alone postgres (only with images and not compose anymore)
this is the network result
container app

"Networks": {
			"bridge": {
				"IPAMConfig": null,
				"Links": null,
				"Aliases": null,
				"MacAddress": "02:42:ac:11:00:03",
				"DriverOpts": null,
				"NetworkID": "a7f2086d19490cea6832395ef97ccb4b05f31bea753bcc4cefbaa4c10ca36b3a",
				"EndpointID": "b684a7e8e50f3a302f08fca7db7ad9a69bbff62f1aaedb3d18a5c8785f392f49",
				"Gateway": "172.17.0.1",
				"IPAddress": "172.17.0.3",
				"IPPrefixLen": 16,
				"IPv6Gateway": "",
				"GlobalIPv6Address": "",
				"GlobalIPv6PrefixLen": 0,
				"DNSNames": null
			}

postgres

"Networks": {
			"bridge": {
				"IPAMConfig": null,
				"Links": null,
				"Aliases": null,
				"MacAddress": "02:42:ac:11:00:02",
				"DriverOpts": null,
				"NetworkID": "a7f2086d19490cea6832395ef97ccb4b05f31bea753bcc4cefbaa4c10ca36b3a",
				"EndpointID": "67c5e450a0b3cadf645b1c458bbc72f8e6325b6e3bec340d1b5b5905d9368313",
				"Gateway": "172.17.0.1",
				"IPAddress": "172.17.0.2",
				"IPPrefixLen": 16,
				"IPv6Gateway": "",
				"GlobalIPv6Address": "",
				"GlobalIPv6PrefixLen": 0,

I mapped postgres to 5431:5432 on host, and modified my config arquive to connect to localhost:5432

with this second configuration (2 stadalone containers instead of compose)
Im abble to connect to db, but I got timeout, apparently the connections doesnt close itselt, bcs I never had this error when runnig this application before

[error] Postgrex.Protocol (#PID<0.463.0>) timed out because it was handshaking for longer than 15000ms
[error] Postgrex.Protocol (#PID<0.463.0>) failed to connect: ** (DBConnection.ConnectionError) tcp recv (idle): closed
[error] Postgrex.Protocol (#PID<0.464.0>) timed out because it was handshaking for longer than 15000ms
[error] Postgrex.Protocol (#PID<0.464.0>) failed to connect: ** (DBConnection.ConnectionError) tcp recv (idle): closed
[error] Postgrex.Protocol (#PID<0.462.0>) timed out because it was handshaking for longer than 15000ms
[error] Postgrex.Protocol (#PID<0.462.0>) failed to connect: ** (DBConnection.ConnectionError) tcp recv (idle): closed
[error] Postgrex.Protocol (#PID<0.469.0>) timed out because it was handshaking for longer than 15000ms
[error] Postgrex.Protocol (#PID<0.469.0>) failed to connect: ** (DBConnection.ConnectionError) tcp recv (idle): closed
[error] Postgrex.Protocol (#PID<0.470.0>) timed out because it was handshaking for longer than 15000ms