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
│   └── Dockerfil         


        

Answer 1

TL;DR

Add

version: '3.7'
services:
  web:
    ...
    network_mode: bridge

Read about network_mode in the documentation.

Long version

Disclaimer: I am not very knowledgeable about Docker networking, but this did the trick for me. YMMV.

When I ran docker run my-image the networking gave me no problems, but when I converted this command to a docker-compose.yml file, I got the same error as the OP.

I read Arenim's answer and some other stuff on the internet that suggested to re-use an existing network.

You can find existing networks like this:

# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
ca0415dfa442        bridge              bridge              local
78cbbda034dd        host                host                local
709f13f4ce2d        none                null                local

I wanted to reuse the default bridge network, so I added

services:
  web:
    ...

networks:
  default:
    external:
      name: bridge

to the the root of my docker-compose.yml (so not inside one of my services, but at the root indentation).

I now got the following error:

ERROR: for your-container network-scoped alias is supported only for containers in user defined networks

This led met to this Docker Github issue, that plainly stated that I should add the network_mode object to my docker-compose:

version: '3.7'
services:
  web:
    ...
    network_mode: bridge

This was tested on Docker version 18.09.8, docker-compose version 1.24.1 and the compose file format 3.7.