Failed to start Docker kitematic on window

  docker, question

Kitematic has not been installed under window before, but failed after installation today:

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The log is as follows:

C:\Program Files\Docker Toolbox\  docker-machine.exe -D create -d virtualbox --virtualbox-memory 2048 default returned non zero exit code. Stderr: Docker Machine Version: 0.5.2 ( 0456b9  f ) Found binary path at C:\Program Files\Docker Toolbox\  docker-machine-driver-virtualbox.exe Launching plugin server for driver virtualbox Plugin server listening at address 127.0.0.1:52012 ()   Calling .GetVersion Using API Version 1 () Calling .SetConfigRaw () Calling .GetMachineName (flag-lookup)   Calling .GetCreateFlags Making call to close connection to plugin binary Making call to close driver server (flag-lookup)   Calling .Close Successfully made call to close driver server Found binary path at C:\Program Files\Docker Toolbox\  docker-machine-driver-virtualbox.exe Launching plugin server for driver virtualbox Plugin server listening at address 127.0.0.1:52016 ()   Calling .GetVersion Using API Version 1 () Calling .SetConfigRaw () Calling .GetMachineName (default) Calling .GetMachineName (default) Calling .DriverName Host already exists: "default"

1. when Kitematic was installed, was virtualbox installed?

2. Kitematic of Windows is rather strange and will not connect with vb docker instances that are already running. Look at the last. drivernamehost readyexists: “default” in your log. it is the instance that is already running. Go open virtualbox, see a default machine in the branch, turn it off, or delete it. Start Kitematic again.

3. Additional: Kitematic of Windows will start Hyper-V first. Some non-Server versions of Windows cannot install Hyper-V and will report an error. There will be two buttons to switch to virtualbox.