Docker Machine network error on public network

Question

I have an issue where I'm unable to start any docker machines whilst connected to a the WiFi network in my local Starbucks, receiving the following output;

$ docker-machine start
Starting "default"...
(default) Check network to re-create if needed...
Error setting up host only network on machine start: host-only cidr conflicts with the network address of a host interface

This does not happen when connected to my home network, or whilst using my mobile hotspot. Is there any workaround for this?

Answer 1

There is a collision between the docker machine and the network that is being set up for wifi. Try creating a new docker machine with other ip:

docker-machine create --driver virtualbox --virtualbox-hostonly-cidr "192.168.123.99/24" mymachine

Use it:

docker-machine env mymachine

This is a new machine in addition to the 'default' one. You might see that it won't have your previous work (images, etc).

Answer 2

Your docker-machine start failed. So either you create new VM or repair existing VM.

1. For new VM option, use --virtualbox-hostonly-cidr "10.10.10.1/24" (replace 10.10.10.1/24 with whatever subnet you want VM to use.)

2. For already created VM(start failed), bring up the virtual box UI and change it in the network preferences. Use docker-machine ls to list existing VMs.