CODEWITHSUNDEEP
pythondockerredis
DrewLearns
DrewLearns

Reputation: 11

redis.exceptions.ConnectionError: Error 99 connecting to localhost:6379. Cannot assign requested address

Any ideas why I get a connection error when trying to run a redis command from one container to another? I'm trying to run an old python 2.7 lambda locally in order to test before upgrading to 3.8.10 I'm running a script that builds and links redisdb container with my_app container:

docker build . -t my_app:latest
docker pull redis:3.2.4-alpine && \
docker run --name=redisdb -d  redis:3.2.4-alpine redis-server
docker run \
    --rm -t -i -d \
    --link redisdb:redis \
    -h redis -p 6379 \
    -e CONFIG_FILE=local_config.yaml \
    my_app

I am running a python script on my_app with the following commands:

r = redis.Redis()
r.mset({"Bahamas": "Nassau"})
print(r.get("Bahamas"))

I've also tried the top suggestion here: Error 99 connecting to localhost:6379. Cannot assign requested address and passed r = redis.Redis(host='localhost', port=6379, decode_responses=True) with the same results.

Every time I try to run that python script in the my_app container, I get:

redis.exceptions.ConnectionError: Error 99 connecting to localhost:6379. Cannot assign requested address.

When I run the containers and then check docker ps I get this:

$ docker ps
CONTAINER ID   IMAGE                          COMMAND                  CREATED              STATUS              PORTS                     NAMES
76aea9308821   mar-atlas-readings-processor   "python2"                About a minute ago   Up About a minute   0.0.0.0:64098->6379/tcp   mar-atlas-readings-processor
f313113341de   redis:3.2.4-alpine             "docker-entrypoint.s…"   About a minute ago   Up About a minute   6379/tcp                  redisdb

This shows the correct port connections.

Upvotes: 0

Views: 2070

Answers (1)

artran
artran

Reputation: 320

Your python app is trying to talk to Redis on localhost but the Redis container is on a different localhost.

You should be able to use the link configured in the docker run ... command, i.e redisdb, for the host option.

Upvotes: 1

Related Questions