Error launching weblate container

[FranRM]

Describe the issue

I tried to launch a container with weblate and always get this error:

weblate | Starting Weblate 5.12.2...
weblate | Generating Django secret...
weblate | System check identified no issues (2 silenced).
weblate | [2025-08-01 12:25:40,023: WARNING/34] Command failed: ConnectionError: Error -3 connecting to cache:6379. Temporary failure in name resolution.
weblate | Traceback (most recent call last):
weblate | File "/app/venv/lib/python3.13/site-packages/django_redis/cache.py", line 29, in _decorator
weblate | return method(self, *args, **kwargs)
weblate | File "/app/venv/lib/python3.13/site-packages/django_redis/cache.py", line 138, in has_key
weblate | return self.client.has_key(*args, **kwargs)
weblate | ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
weblate | File "/app/venv/lib/python3.13/site-packages/django_redis/client/default.py", line 740, in has_key
weblate | raise ConnectionInterrupted(connection=client) from e
weblate | django_redis.exceptions.ConnectionInterrupted: Redis ConnectionError: Error -3 connecting to cache:6379. Temporary failure in name resolution.
weblate |
weblate | During handling of the above exception, another exception occurred:
weblate |
weblate | Traceback (most recent call last):
weblate | File "/app/venv/bin/weblate", line 10, in
weblate | sys.exit(main())
weblate | ~~~~^^
weblate | File "/app/venv/lib/python3.13/site-packages/weblate/runner.py", line 19, in main
weblate | utility.execute()
weblate | ~~~~~~~~~~~~~~~^^
weblate | File "/app/venv/lib/python3.13/site-packages/django/core/management/init.py", line 436, in execute
weblate | self.fetch_command(subcommand).run_from_argv(self.argv)
weblate | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
weblate | File "/app/venv/lib/python3.13/site-packages/django/core/management/base.py", line 416, in run_from_argv
weblate | self.execute(*args, **cmd_options)
weblate | ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
weblate | File "/app/venv/lib/python3.13/site-packages/django/core/management/base.py", line 460, in execute
weblate | output = self.handle(*args, **options)
weblate | File "/app/venv/lib/python3.13/site-packages/django/core/management/commands/shell.py", line 247, in handle
weblate | exec(options["command"], {**globals(), **self.get_namespace(**options)})
weblate | ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
weblate | File "", line 1, in
weblate | File "/app/venv/lib/python3.13/site-packages/django_redis/cache.py", line 36, in _decorator
weblate | raise e.cause # noqa: B904
weblate | ^^^^^^^^^^^^^^^^^
weblate | File "/app/venv/lib/python3.13/site-packages/django_redis/client/default.py", line 738, in has_key
weblate | return client.exists(key) == 1
weblate | ~~~~~~~~~~~~~^^^^^
weblate | File "/app/venv/lib/python3.13/site-packages/redis/commands/core.py", line 1729, in exists
weblate | return self.execute_command("EXISTS", *names, keys=names)
weblate | ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
weblate | File "/app/venv/lib/python3.13/site-packages/redis/client.py", line 559, in execute_command
weblate | return self._execute_command(*args, **options)
weblate | ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
weblate | File "/app/venv/lib/python3.13/site-packages/redis/client.py", line 565, in _execute_command
weblate | conn = self.connection or pool.get_connection(command_name, **options)
weblate | ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
weblate | File "/app/venv/lib/python3.13/site-packages/redis/connection.py", line 1422, in get_connection
weblate | connection.connect()
weblate | ~~~~~~~~~~~~~~~~~~^^
weblate | File "/app/venv/lib/python3.13/site-packages/redis/connection.py", line 363, in connect
weblate | raise ConnectionError(self._error_message(e))
weblate | redis.exceptions.ConnectionError: Error -3 connecting to cache:6379. Temporary failure in name resolution.

I already tried

• I've read and searched the documentation.
• I've searched for similar filed issues in this repository.

Steps to reproduce the behavior

I use this compose:

services:
  redis:
    image: redis:7
    container_name: redis
    restart: unless-stopped
    networks:
      - 71_test_bridge

  db:
    image: postgres:15
    container_name: db
    restart: unless-stopped
    environment:
      POSTGRES_DB: weblate
      POSTGRES_USER: weblate
      POSTGRES_PASSWORD: weblate
    volumes:
      - db_data:/var/lib/postgresql/data
    networks:
      - 71_test_bridge

  weblate:
    image: weblate/weblate:5.12
    container_name: weblate
    environment:
      CACHE_URL: redis://redis:6379/0
      DJANGO_CACHE_URL: redis://redis:6379/0
      DJANGO_REDIS_URL: redis://redis:6379/0
      DATABASE_URL: postgres://weblate:weblate@db/weblate
      POSTGRES_HOST: db
      POSTGRES_DB: weblate
      POSTGRES_USER: weblate
      POSTGRES_PASSWORD: weblate
      WEBLATE_EMAIL_HOST: smtp.example.com
      WEBLATE_EMAIL_HOST_USER: user
      WEBLATE_EMAIL_HOST_PASSWORD: pass
      WEBLATE_SERVER_EMAIL: weblate@example.com
      WEBLATE_DEFAULT_FROM_EMAIL: weblate@example.com
      WEBLATE_SITE_DOMAIN: weblate.example.com
      WEBLATE_ADMIN_PASSWORD: password for the admin user
      WEBLATE_ADMIN_EMAIL: weblate.admin@example.com
    ports:
      - "8069:8069"
    networks:
      - 71_test_bridge

volumes:
  db_data:

networks:
  71_test_bridge:
    external: true

Expected behavior

No response

Screenshots

No response

Exception traceback

Additional context

No response

[nijel]

The container cache configuration doesn't match running containers:

• Either the cache and db container needs to follow the naming; please see https://docs.weblate.org/en/latest/admin/install/docker.html#installation
• Or you need to change the environment to tell Weblate use differently named servers; see https://docs.weblate.org/en/latest/admin/install/docker.html#caching-server-setup

PS: You are also missing persistence and volume on the redis container, that will cause serious performance impact on restarts.

[FranRM]

The problem was the lack of the REDIS_HOST label, now it works properly, thanks.