ERROR: You must provide a user name through --os-username or env[OS_USERNAME]

Solution:

$cd devstack/

$source openrc admin admin # for admin rights

or

$source openrc demo demo # for demo user

Reference:

• http://stackoverflow.com/questions/20235276/openstack-compute-nova-error

ERROR: at least one rpc backend must be enabled

1. Edit local.conf file on compute node

   add rabbit. (qpid was not working in my case)

ENABLED_SERVICES=n-cpu,n-net,n-api,c-sch,c-api,c-vol,rabbit

./stack.sh permission issue

1. Install devstack using stack account. Not root.
 Be careful of current user.

su: Authentication failure in Ubuntu

$ sudo passwd root
[sudo] password for ramesh:
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

ref:
http://www.thegeekstuff.com/2009/09/ubuntu-tips-how-to-login-using-su-command-su-gives-authentication-failure-error-message/

Can't recognize Windows recovery CDs

1. set BIOS boot mode to legacy.
2. set legacy boot mode to first priority.

Can't recognize unallocated USB space

1. [window cmd console] diskpart

2. DISKPART> list disk

3. DISKPART> select disk 'the usb partition number'

4. DISKPART> clean

5. create partition primary

6. list partition

7. select partition 1

8. active

9. format fs=ntfs quick

10. exit

ref: http://liverex.net/65