Boot2Docker Start up fails - virtual-machine

Question

I am completely new to docker. I have installed it from Source. I am trying to run it from cmd by using boot2docker start. But i get the following
boot2docker start
Failed to start machine boot2docker-vm <run again with v for details>
boot2docker init
virtual machine boot2docker-vm already exists
boot2docker start
Failed to start machine boot2docker-vm exit status:1
So, For you guys it would be a simple one. I don't know what to do. I tried SO. But i can't able to understand the solution so i failed to achieve it. Please provide some suggestions
EDIT:
I hope it will be helpful. There is some thing disabled in bios.
boot2docker -v start
Boot2Docker-cli version: v1.4.1
Git commit: 43241cb
2014/12/18 16:12:35 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe
showvminfo boot2docker-vm --machinereadable
2014/12/18 16:12:35 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe
guestproperty set boot2docker-vm /VirtualBox/GuestAdd/SharedFolders/MountPrefix
/
2014/12/18 16:12:36 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe
guestproperty set boot2docker-vm /VirtualBox/GuestAdd/SharedFolders/MountDir /
2014/12/18 16:12:36 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe
sharedfolder add boot2docker-vm --name c/Users --hostpath C:\Users --automount
VBoxManage.exe: error: Shared folder named 'c/Users' already exists
VBoxManage.exe: error: Details: code VBOX_E_OBJECT_IN_USE (0x80bb000c), componen
t SessionMachine, interface IMachine, callee IUnknown
VBoxManage.exe: error: Context: "CreateSharedFolder(Bstr(name).raw(), Bstr(hostp
ath).raw(), fWritable, fAutoMount)" at line 1009 of file VBoxManageMisc.cpp
2014/12/18 16:12:36 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe
setextradata boot2docker-vm VBoxInternal2/SharedFoldersEnableSymlinksCreate/ c/U
sers 1
2014/12/18 16:12:36 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe
startvm boot2docker-vm --type headless
Waiting for VM "boot2docker-vm" to power on...
VBoxManage.exe: error: **VT-x is disabled in the BIOS.** (VERR_VMX_MSR_VMXON_DISABLE
D)
VBoxManage.exe: error: D**etails: code E_FAIL (0x80004005)**, component Console, int
erface IConsole
2014/12/18 16:12:38 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe
showvminfo boot2docker-vm --machinereadable
error in run: Failed to start machine "boot2docker-vm": exit status 1

Answer 1

Cause:
The nugget of info you need to pay attention to in your error log is
Waiting for VM "boot2docker-vm" to power on...
VBoxManage.exe: error: **VT-x is disabled in the BIOS.**(VERR_VMX_MSR_VMXON_DISABLE
D)
This means that your current workstation's BIOS settings is preventing virtualization of another operating system on your CPU. Docker runs a virtual linux OS on your machine, so this is the issue.
For Intel chips, virtualization features are usually called VT-x or something like that. For AMD chips, virtualization features are called AMD-V. I use an Intel chip like you though, so this solution pertains to Intel chips.
Solution:
Power down and go into your BIOS and enable VT-x. In my BIOS, a Lenovo Thinkpad T440, the setting that needs to be changed was under Security->Virtualization.
Power up and go back to your C:/path/to/Boot2Docker for Windows folder.
Run boot2docker delete to ensure no VMs are running.
Run boot2docker init to initialize the VM.
Run boot2docker start to create a new Docker Virtual Machine!
To get access to your Docker VM, run boot2docker ssh since the Docker Client doesn't run on Windows as of version 1.5.0.