Client:
Version: 1.8.1
API version: 1.20
Go version: go1.4.2
Git commit: d12ea79
Built: Thu Aug 13 02:35:49 UTC 2015
OS/Arch: linux/amd64
Error response from daemon: client and server don’t have same version (client API version: 1.20, server API version: 1.19)