Repeat bug: docker eclipse-mosquitto:2.0 Error: Address not available

[ppbrown]

you guys seem to have reintroduced this bug:
#2040

According to some of the writeup there, if I specify a config of

listener 1883
allow_anonymous true

it should work. but it does not.
The container still keeps throwing

Error: Address not available

There was one guy there who put up a config file that supposedly worked.. but it has all kinds of EXTRA things, that people may not want to use.
We need a concise config file with the minimum that is expected to work, for a container accepting connections from outside itself.

[ppbrown]

oh, i guess I need to amend my bug report.
The instructions to override config at
https://hub.docker.com/_/eclipse-mosquitto
dont work any more.
If I use -v mosquitto.conf:/mosquitto/config/mosquitto.conf
docker complains

docker: Error response from daemon: source /data/var/lib/docker/overlay2/bc24437b89cc635e49cc1d580578c7a4bd480492e639e632494637d1e9fba0/merged/mosquitto/config/mosquitto.conf is not directory.

If I try to work around this with a directory overlay strategy, with

-v configdir:/mosquitto/config/

it STARTS UP.. but it does not actually overlay the directory.

So this is more of a "documentation is broken" bug report.

ACTUAL FIX:

Create file with just

allow_anonymous true
listener 1883

and then run container with FULL PATH to config override. So,

docker run -d --name mosquitto -p 1883:1883 \
  -v $PWD/mosquitto.conf:/mosquitto/config/mosquitto.conf  eclipse-mosquitto