Unable to connect redis from python inside docker container

Question

Dockerfile

FROM python:3.6-slim

ENV PYTHONUNBUFFERED 1
WORKDIR /usr/src/duck

COPY ./ /usr/src/duck

RUN apt-get update
RUN apt-get install -y redis-server

RUN pip install -r requirements.txt

CMD ["/bin/bash","-c","python manage.py runserver 0.0.0.0:8000"]

python code:

import redis
red = redis.StrictRedis(host="redis", port=6379, db=0)
red.set("working", "yes")

Here i am trying to dockerize both python and redis. Above is my Dockerfile and python code.

It is throwing me below error:

while running python code.

Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/src/duck/settings/views.py", line 6, in check_redis
    red.set("working", "yes")
File "/usr/local/lib/python3.6/site-packages/redis/client.py", line 1451, in set
    return self.execute_command('SET', *pieces)
File "/usr/local/lib/python3.6/site-packages/redis/client.py", line 772, in execute_command
    connection = pool.get_connection(command_name, **options)
File "/usr/local/lib/python3.6/site-packages/redis/connection.py", line 994, in get_connection
    connection.connect()
File "/usr/local/lib/python3.6/site-packages/redis/connection.py", line 497, in connect
    raise ConnectionError(self._error_message(e))
redis.exceptions.ConnectionError: Error -2 connecting to redis:6379. Name or service not known.

Please have a look.

Redis is probably not running inside the container. Merely installing redis-server inside the docker is not enough to start it. You probably need something like: github.com/just-containers/s6-overlay to run multiple processes (python+redis) inside docker. — rdas
– rdas, Commented Jun 11, 2019 at 16:55

digao_mb · Accepted Answer · 2019-06-11 16:56:51Z

2

The container is running only the python server, not redis. You should initiate the redis server on another container (probably the redis default image will do). And make the python server point to it.

You are lucky, because the compose docs have an example with a python app and Redis server. https://docs.docker.com/compose/gettingstarted/

answered Jun 11, 2019 at 16:56

digao_mb

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3 Comments

soubhagya pradhan Over a year ago

Is it possible to do without using docker-compose?

digao_mb Over a year ago

As @rdas commented you can make you image run both applications. He suggested this: github.com/just-containers/s6-overlay I used this one in production: github.com/phusion/baseimage-docker

David Maze Over a year ago

You can just docker run both containers without specifically needing Compose. You will also need to docker network create anyname and make sure to start both containers on --net anyname so that they can see each other. One process per container is generally considered a best practice.

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