How do I login to CoreOS installation.

After installing my CoreOS for the first time. I was startled to see login prompt. I tried various default passwords nothing worked. Thanks to following blog, here is what worked for me. https://www.netroby.com/view/3795

If you just installed CoreOS, you do not set password, Now you have a chance to set it up again.

Once you see the boot screen , press keyboard, let grub menu hang up.

and type e, to enter edit mode.

you may see console=tty0 and etc,

Just put these code insert after it

coreos.autologin=tty1 coreos.autologin=ttyS0

And press F10 to boot system, now you have the chance to set up your password.