python - Docker "ERROR: could not find an available, non-overlapping IPv4 address pool among the defaults to assign to the network"

Question

I have a directory apkmirror-scraper-compose with the following structure:

.
├── docker-compose.yml
├── privoxy
│?? ├── config
│?? └── Dockerfile
├── scraper
│?? ├── Dockerfile
│?? ├── newnym.py
│?? └── requirements.txt
└── tor
    └── Dockerfile

I'm trying to run the following docker-compose.yml:

version: '3'

services:
  privoxy:
    build: ./privoxy
    ports:
      - "8118:8118"
    links:
      - tor

  tor:
    build:
      context: ./tor
      args:
        password: ""
    ports:
      - "9050:9050"
      - "9051:9051"

  scraper:
    build: ./scraper
    links:
      - tor
      - privoxy

where the Dockerfile for tor is

FROM alpine:latest
EXPOSE 9050 9051
ARG password
RUN apk --update add tor
RUN echo "ControlPort 9051" >> /etc/tor/torrc
RUN echo "HashedControlPassword $(tor --quiet --hash-password $password)" >> /etc/tor/torrc
CMD ["tor"]

that for privoxy is

FROM alpine:latest
EXPOSE 8118
RUN apk --update add privoxy
COPY config /etc/privoxy/config
CMD ["privoxy", "--no-daemon"]

where config consists of the two lines

listen-address 0.0.0.0:8118
forward-socks5 / tor:9050 .

and the Dockerfile for scraper is

FROM python:2.7-alpine
ADD . /scraper
WORKDIR /scraper
RUN pip install -r requirements.txt
CMD ["python", "newnym.py"]

where requirements.txt contains the single line requests. Finally, the program newnym.py is designed to simply test whether changing the IP address using Tor is working:

from time import sleep, time

import requests as req
import telnetlib


def get_ip():
    IPECHO_ENDPOINT = 'http://ipecho.net/plain'
    HTTP_PROXY = 'http://privoxy:8118'
    return req.get(IPECHO_ENDPOINT, proxies={'http': HTTP_PROXY}).text


def request_ip_change():
    tn = telnetlib.Telnet('tor', 9051)
    tn.read_until("Escape character is '^]'.", 2)
    tn.write('AUTHENTICATE ""
')
    tn.read_until("250 OK", 2)
    tn.write("signal NEWNYM
")
    tn.read_until("250 OK", 2)
    tn.write("quit
")
    tn.close()


if __name__ == '__main__':
    dts = []
    try:
        while True:
            ip = get_ip()
            t0 = time()
            request_ip_change()
            while True:
                new_ip = get_ip()
                if new_ip == ip:
                    sleep(1)
                else:
                    break
            dt = time() - t0
            dts.append(dt)
            print("{} -> {} in ~{}s".format(ip, new_ip, int(dt)))
    except KeyboardInterrupt:
        print("Stopping...")
        print("Average: {}".format(sum(dts) / len(dts)))

The docker-compose build builds successfully, but if I try docker-compose up, I get the following error message:

Creating network "apkmirrorscrapercompose_default" with the default driver
ERROR: could not find an available, non-overlapping IPv4 address pool among the defaults to assign to the network

I tried searching for help on this error message, but couldn't find any. What is causing this error?

Answer 1

I've seen it suggested docker may be at its maximum of created networks. The command docker network prune can be used to remove all networks not used by at least one container.

My issue ended up being, as Robert commented about: an issue with openvpn service openvpn stop 'solved' the problem.