How to Set Rancher OS to Provide Local IPs to Docker Containers?

[theprez]

Hey All -

So my network is configured in the 192.168.0.0/24 subnet and everything connects to a Untangle box for content filtering and ultimately into a Ubiquiti Switch and USG Pro.

It appears there's some Rancher OS magic going on that I don't seem to follow - from what I can tell, Rancher OS will obtain a random DHCP IP within the 192.168.0.X subnet, but any containers apparently grab their own IP out of a different subnet. This causes the untangle content filter to go nuts and it causes the Ubiquiti equipment not to see it from a QoS and display perspective in the single pane of glass.

How do I have docker/Rancher OS allocate a real 192.168.0.X IP to any container?

P.S. - I know you can route specific ports to the Rancher Host IP but that's not what I'm trying to accomplish.

Thanks

 

[nightshade00013]

I would suggest hitting the Rancher OS forums for this, we have a few people here using it but they have a whole lot more who deal with it on a regular basis.

https://forums.rancher.com/

 

[Ericloewe]

You can't do that without the host playing along, which basically implies one virtual NIC per container, which Rancher then needs to juggle around appropriately.

Edit: Well, there are other options, but the host always needs to know what's going on in the VM - or rather, the virtual NIC needs to support the required features.

 

[KrisBee]

@theprez rancheros is the docker host to which you can assign a static IP by either giving your rancheros vm a mac address and using DHCP reservation or setting a static IP by using a suitable cloud-config within the rancheros vm. But you need to get to gripes with the various forms of docker networking (host, bridge, overlay, etc ) to know how/if the containers you wish to use will function as you want within your overall network. A docker macvlan may be of help.

You have not said if your are running the Rancher UI within your rancheros vm or not, but might find this useful: https://forums.freenas.org/index.ph...ner-networking-demystified.53516/#post-369598

Plenty refs on the web, for example: https://blog.docker.com/2016/12/understanding-docker-networking-drivers-use-cases/