flockerctl doesn't work on a node where DOCKER_HOST points to Docker Swarm

[wallrj]

In the Flocker CloudFormation installer we set up a client node and ask the user to set the environment variable DOCKER_HOST="<ip address and port of swarm API>" .

That means that the flockerctl wrapper script attempts to run the flockerctl container on one of the Swarm nodes....which doesn't work....because the container has a volume mapping to the certificates installed on the local machine.

Instead the wrapper script should override the DOCKER_HOST variable to the local Docker Unix socket.

I was going to say "That's how docker-compose does it", but actually it doesn't:

• https://github.com/docker/compose/blame/master/script/run.sh#L23

I wonder if containerized docker-compose even works with docker swarm?