[openstack-dev] [Magnum] Does Docker-Swarm not support inter-node/vm inter-container networking ?

Waines, Greg Greg.Waines at windriver.com
Wed Jul 20 11:48:24 UTC 2016


Thanks Ton,

When is the Docker libnetwork functionality forecasted to be available ?

Greg.

From: Ton Ngo <ton at us.ibm.com>
Reply-To: "openstack-dev at lists.openstack.org" <openstack-dev at lists.openstack.org>
Date: Tuesday, July 19, 2016 at 6:58 PM
To: "openstack-dev at lists.openstack.org" <openstack-dev at lists.openstack.org>
Subject: Re: [openstack-dev] [Magnum] Does Docker-Swarm not support inter-node/vm inter-container networking ?


Hi Greg,
This is a capability that we are working on at this time: enabling Docker libnetwork using the Kuryr driver.
This will let you set up networks where the containers are connected to and they will be allocated unique routable IP.
In the current default networking mode, you can still let container provides service to each other through Docker
port mapping. The end point for the container service would be the IP address of the VM where the container is hosted
together with the port mapped. You just cannot ping from one container to another across VM's in this mode.
Ton Ngo,


[nactive hide details for "Waines, Greg" ---07/19/2016 11:12:50 AM---I hav]"Waines, Greg" ---07/19/2016 11:12:50 AM---I have successfully setup devstack with Magnum, following this link https://github.com/openstack/mag

From: "Waines, Greg" <Greg.Waines at windriver.com>
To: "openstack-dev at lists.openstack.org" <openstack-dev at lists.openstack.org>
Date: 07/19/2016 11:12 AM
Subject: [openstack-dev] [Magnum] Does Docker-Swarm not support inter-node/vm inter-container networking ?

________________________________



I have successfully setup devstack with Magnum,
following this link https://github.com/openstack/magnum/blob/master/doc/source/dev/quickstart.rst#building-and-using-a-swarm-bay

I created a Docker-Swarm bay and successfully launched some simple containers.

I noticed that Docker-Swarm’s Container Networking Solution seems to simply be an SNAT on its swarm-node VM.
And noticed that Docker-Swarm assigns the same Container subnet to each swarm-node VM … and re-uses Container IP Addresses from this subnet across swarm-node VMs.

Given this … it does not appear that Docker-Swarm can support networking between two containers on different swarm-node VMs.
Is this True ?
OR
Is there a configuration option, thru Magnum or Docker-Swarm to enable this inter-node inter-container Networking ?

Greg.
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