How is a Docker Machine marked as active?

Question

I am working through the Docker Machine User Guide over at https://docs.docker.com/v1.5/machine/.

It says:

You can see the machine you have created by r         


        

Answer 1

Use below command for Docker for Windows Container with Powershell to make machine active:

#Powershell command
PS: docker-machine env default
#output might me like this
 $Env:DOCKER_TLS_VERIFY = "1"
 $Env:DOCKER_HOST = "tcp://172.16.104.171:2376"
 $Env:DOCKER_CERT_PATH = "C:\Users\username\.docker\machine\machines\default"
 $Env:DOCKER_MACHINE_NAME = "default"
#DOCKER_HOST environmental variable should has same value as default machine
PS:$Env:DOCKER_HOST = "tcp://172.16.104.171:2376" # should be same as default machine Env:DOCKER_HOST
#Now list docker machines, default will be active.
PS: docker-machine ls
#default is not active and it look like this.
NAME       ACTIVE   DRIVER   STATE     URL                         SWARM   DOCKER    ERRORS
default    *        hyperv   Running   tcp://172.16.104.171:2376           v1.12.3
manager1   -        hyperv   Running   tcp://172.16.104.168:2376           v1.12.3

Dock