Re: [Qemu-discuss] what's wrong with mey qemu-kvm

[Mike Lovell]

On 08/24/2012 07:30 PM, lei yang wrote:
> Hi
>
> I used the redhat RHEL6 boot with initrd but it failed, can sb help me
>
> address@hidden boot]# /usr/libexec/qemu-kvm --enable-kvm -smp 8 -m
> 1024 -net nic,model=virtio -net tap,script=/etc/qemu-ifup -initrd
> /boot/initramfs-2.6.32-279.el6.x86_64.img  -kernel
> /boot/vmlinuz-2.6.32-279.el6.x86_64 -append "root=/dev/ram rw
> console=ttyS0,115200 " -nographic
>
> <snip>
> dracut Warning: No root device "block:/dev/ram" found
>
> dracut Warning: Boot has failed. To debug this issue add "rdshell" to
> the kernel command line.
>
>
> dracut Warning: Signal caught!
>
> dracut Warning: Boot has failed. To debug this issue add "rdshell" to
> the kernel command line.
> Kernel panic - not syncing: Attempted to kill init!
> Pid: 1, comm: init Not tainted 2.6.32-279.el6.x86_64 #1
> Call Trace:
>   [<ffffffff814fd11a>] ? panic+0xa0/0x168
>   [<ffffffff81070bd2>] ? do_exit+0x862/0x870
>   [<ffffffff8117ca75>] ? fput+0x25/0x30
>   [<ffffffff81070c38>] ? do_group_exit+0x58/0xd0
>   [<ffffffff81070cc7>] ? sys_exit_group+0x17/0x20
>   [<ffffffff8100b0f2>] ? system_call_fastpath+0x16/0x1b

the system is complaining that it can't find a block device to mount the 
root filesystem from. you specify "root=/dev/ram" which isn't something 
that exists. /dev/ram0 does but you probably don't want to use it since 
its just a ram backed device with probably nothing in it. you also don't 
define a disk for the guest to use so there isn't another block device 
to mount as the root filesystem.

you need to get a system for the guest to boot. this can be done by 
creating a virtual disk with qemu-img, attaching the virtual disk and a 
rhel installation cd to the guest, and going though a rhel installation. 
if you aren't sure what that means, you should probably use virt-manager 
to configure your vm.

mike