Docker - Error response from daemon: client is newer than server
问题 After creating a new machine with Docker Machine, I'm getting the following error: $ docker ps Error response from daemon: client is newer than server(client API version 1.21, server API version: 1.19) How can I fix this? 回答1: docker-machine upgrade <your-machine> will do the trick. This can happen - as it did for me - even if you're not using RCs and your machine was newly created. It would be due to an ISO cache issue. The error is commented in this thread. If the docker client is 1.9.x and