Since I just updated Docker to 1.1.0 I get:
Error response from daemon: client and server don\'t have same version (client : 1.13, server: 1.12)
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boot2docker delete
boot2docker init
worked for me. stop/start the deamon before and after that of course.
I was trying to query a Docker server with a more recent client:
The solution for me was to just:
export DOCKER_API_VERSION=1.21
Reference: https://docs.docker.com/engine/reference/commandline/cli/