Plugins

[docker-archive]

Plugins

[abronan]

Seems to me that this is only an external tool issuing commands using the remote api. And using some health-checking mechanisms as well as a discovery tool to add new slaves which is connected to the Docker Hub (for now and after some time will allow a cli way to add Slaves).

Concerning the second point, I agree that this would be useful to have of way to link containers across machines. But swarm could surely be composed with a networking stand-alone tool (using Weave for example) to connect containers across machines.

[thaJeztah]

@lukemarsden I saw that you had a meet up during DockerCon regarding this. Has this become more clear? Would you be able to add some information to this ticket (asking, out off interest).

[rgbkrk]

Once a container goes up on a host, how should we be routing to it?

[robhaswell]

@rgbkrk see #146, routing is out of scope for Swarm.

[rgbkrk]

Well, I'm asking about how. It's clear linking doesn't work. I assume tools around it need to pull back the IP and port directly?

[abronan]

@rgbkrk To answer the "How?" on container linking, support for explicit links (with environment variables for the discovery) assumes modifications on the docker core project to be aware of multiple hosts and pull informations (IP and port) from another host through the remote api. But Swarm clearly seems to be an orthogonal tool built on top of Docker, and such a modification will bring some questioning about this orthogonality. Unless this feature is proposed as an extension using the upcoming plugin system

For now you can use Weave to link containers across hosts using virtual network interfaces. Fortunately, Weave is about to be integrated to Docker as a plugin in order to have native support for advanced networking. So this should not be a long-term issue for Swarm.

Hope this answers your question but tell me if I missed your main concern :)

[robhaswell]

Re @abronan there is also the Ambassador pattern.

[abronan]

@robhaswell Yes, +1 for the Ambassador pattern

[aluzzardi]

This is being worked on with the clustering API. We are still missing the "plugin" part, but we are getting the extensible side.

Closing this in favor of #213 to track the underlying efforts.