Mongodb docker tutorial doesn't work (MongoNetworkError: getaddrinfo ENOTFOUND mongodb)

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I’m trying a very basic setup as per the docker compose tutorial, and it fails with this error:

Drippy-Inc+drippy-app-backend git:develop ❯ docker compose up mongoshell
[+] Running 3/3
 ✔ Network drippy-incdrippy-app-backend_default         Created                                                                   0.0s 
 ✔ Container drippy-incdrippy-app-backend-mongodb-1     Created                                                                   0.2s 
 ✔ Container drippy-incdrippy-app-backend-mongoshell-1  Created                                                                   0.2s 
Attaching to mongoshell-1
mongoshell-1  | MongoNetworkError: getaddrinfo ENOTFOUND mongodb
mongoshell-1  | Traceback (most recent call last):
mongoshell-1  |   File "/usr/local/bin/docker-entrypoint.py", line 644, in <module>
mongoshell-1  |     subprocess.run(get_command_line_args(), check=True)
mongoshell-1  |   File "/usr/lib64/python3.9/subprocess.py", line 528, in run
mongoshell-1  |     raise CalledProcessError(retcode, process.args,
mongoshell-1  | subprocess.CalledProcessError: Command '['/bin/bash', '-c', 'sleep 5; mongosh $CONN_STR --eval "show dbs;"']' returned non-zero exit status 1.
mongoshell-1 exited with code 1

The docker-compose.yml file:

services:
  mongoshell:
    image: mongodb/mongodb-community-server:7.0.11-ubi8
    environment:
      - CONN_STR=mongodb://user:pass@mongodb
    command: '/bin/bash -c "sleep 5; mongosh $$CONN_STR --eval \"show dbs;\""'
    depends_on:
      - mongodb

  mongodb:
    image: mongodb/mongodb-community-server:7.0.11-ubi8
    environment:
      - MONGO_INITDB_ROOT_USERNAME=user
      - MONGO_INITDB_ROOT_PASSWORD=pass
    volumes:
      - type: bind
        source: ./data
        target: /data/db

The only differences are:

  • my app name is “mongoshell” instead of “myapplication”
  • and the mongo version is 7.0.11-ubi8 instead of 6.0-ubi8

Why is it not working?