docker daemon

ubuntu@ip-172-31-55-180:~$ eval "$(docker-machine env default)"

docker-machine: command not found

ubuntu@ip-172-31-55-180:~$ docker version

Client:

 Version:      1.12.1

 API version:  1.24

 Go version:   go1.6.3

 Git commit:   23cf638

 Built:        Thu Aug 18 05:22:43 2016

 OS/Arch:      linux/amd64

Cannot connect to the Docker daemon. Is the docker daemon running on this host?

ubuntu@ip-172-31-55-180:~$ docker-machine ssh default

docker-machine: command not found

ubuntu@ip-172-31-55-180:~$ docker run hello-world

docker: Cannot connect to the Docker daemon. Is the docker daemon running on this host?.

See 'docker run --help'.