Trying to set docker-machine to fixed IP, but it keeps changing back

General Discussions
1

Greetings.

I tried to fix my docker-machine vm to a fixed ip 192.168.99.101 by following this: fixIP4dm

It was at first successful. But a while later, it gets changed back to the original 192.168.99.105, and I had to do the same again. If I delete and recreate it again, it ends up with 192.168.99.106, and the number keeps going up with every new creation, and that happens even after I kill the DHCP process.

I also tried to use the option --virtualbox-hostonly-cidr to fix the address as one suggested, though I don’t understand what that means.

docker-machine create -d virtualbox --virtualbox-hostonly-cidr=“192.168.99.101/32” swarmmgr

But it doesn’t work at all gives this “Error creating machine: Error in driver during machine creation: Error setting up host only network on machine start: host-only cidr must be specified with a host address, not a network address”

Would anyone who has been been successful in setting a permanent fixed IP to a docker-machine VM share some experience and insight? or point out what I’m doing wrong.

thanks much!
Ben

2

Hello,

you haven’t say if you’re on Linux and if it should be an IP on your host’s network.

If that is the case, then you can create a new Docker network using the macvlan driver and assigning fixed IPs in compose files. Works perfectly on Ubuntu.

Actually I use a script to create/remove such a network when I need it.

If that’s what you would need, I could publish the script on GitHub.

Regards
accetto

3

Hi Accetto,

thanks so much for sharing this!

Yes, I’m on Ubuntu 16.04. Will read about macvlan. It would be great if you can share the script that embodies your insight.

thanks a lot,
Ben

4

Sorry, I have trouble to spare time for preparing the script for publishing. But I’ve been inspired by this blog article: https://blog.oddbit.com/post/2018-03-12-using-docker-macvlan-networks/

Hopefully it helps.