Error when running on Fedora 30

[corollari]

Description

neo-python can't connect to the container running neo-privatenet-docker, producing the following error:

[E 190624 10:16:25 prompt:273] Error: private network container doesn't seem to be running, or RPC is not enabled.

Reproduction steps

Follow the steps outlined in https://hub.docker.com/r/cityofzion/neo-python/ on Fedora 30, running the following:

# Pull the latest images from Docker hub
docker pull cityofzion/neo-python
docker pull cityofzion/neo-privatenet

# Start the private network container. Maps the current working directory on the host into 
# `/neo-python/sc/` and exposes the ports.
docker run --rm -d --name neo-privatenet -p 20333-20336:20333-20336/tcp -p 30333-30336:30333-30336/tcp cityofzion/neo-privatenet

# Start the neo-python container
docker run --rm -it --net=host -v $(pwd):/neo-python/sc -h neo-python --name neo-python cityofzion/neo-python /bin/bash

# Start neo-python
np-prompt -p -v

Details

Full shell output

Line breaks added to increase readability

[corollari@localhost neo-priv]$ docker pull cityofzion/neo-python
Using default tag: latest
latest: Pulling from cityofzion/neo-python
Digest: sha256:b4a8a830e64b761c5c54c6d96bcc5251ff9795d2106e5a78f001ac06b1a70fdc
Status: Image is up to date for cityofzion/neo-python:latest

[corollari@localhost neo-priv]$ docker pull cityofzion/neo-privatenet
Using default tag: latest
latest: Pulling from cityofzion/neo-privatenet
Digest: sha256:3d1ae4149dc68e9a9155d0c8081d55bf49e7fa614e275d137850ff1b7f0073f7
Status: Image is up to date for cityofzion/neo-privatenet:latest

[corollari@localhost neo-priv]$ docker run --rm -d --name neo-privatenet -p 20333-20336:20333-20336/tcp -p 30333-30336:30333-30336/tcp cityofzion/neo-privatenet
0b92e13483bd6c69ae343fe3e0ca2e3cf6f69d67ff42e5b796b76c58978df924

[corollari@localhost neo-priv]$ docker run --rm -it --net=host -v $(pwd):/neo-python/sc -h neo-python --name neo-python cityofzion/neo-python /bin/bash

root@neo-python:/neo-python# np-prompt -p -v
[E 190624 10:16:25 prompt:273] Error: private network container doesn't seem to be running, or RPC is not enabled.

root@neo-python:/neo-python#

docker-ps output

CONTAINER ID        IMAGE                       COMMAND                  CREATED             STATUS              PORTS                                                                        NAMES
46e3ab0b351a        cityofzion/neo-python       "/bin/bash"              16 minutes ago      Up 16 minutes                                                                                    neo-python
0b92e13483bd        cityofzion/neo-privatenet   "/bin/bash /opt/run_…"   17 minutes ago      Up 17 minutes       0.0.0.0:20333-20336->20333-20336/tcp, 0.0.0.0:30333-30336->30333-30336/tcp   neo-privatenet

Versions

Docker: version 18.06.3, build d7080c1
OS: Fedora 30 (linux kernel 4.20.16-200.fc29.x86_64)

Notes

I came across this problem when debugging a downstream issue (see CityOfZion/neo-local#178) that I think is directly caused by this error.

The problem I'm seeing could also be caused by something in neo-python, but based on my testing I think the root cause is in neo-privatenet-docker. Still, I could be wrong, so if you think the issue is caused by something else just tell me and I'll transfer the issue.