Multiple DB instance on single Docker block CPU core

[praveshtora]

I am having two microservices using the same redis server running via docker. Both of then are configured to use different db i.e. db0 and db1 in redis. However after some time I am observing both of the CPU core are being used 100% by redis.

[wglambert]

Can you give all the commands you ran and any relevant files or logs for reproducing the issue

[praveshtora]

I am using redis npm to make connection to redis server and in its configuration is something like this -

const RedisClient = Redis.createClient({host: , db: 0}) from microservice 1 and
const RedisClient = Redis.createClient({host: , db: 1}) from microservice 2

I am not sure if this is the cause of issue, but this was the only change that I brought in already running server. I am observing this issue on two my amazon EC2 server instance after making this change.

The docker image for redis in 4.0.9.

[tianon]

See https://github.com/docker-library/docs/pull/1571/files

(duplicate of #217, #225, and probably others)

TL;DR, you exposed your Redis server(s) publicly to the internet without a password, and they are now compromised. I'd suggest throwing those containers away completely and creating fresh containers with a password configured and/or without exposing the ports to the internet.