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Re: Installing Debian with preseed file using qemu

On 11/7/2018 2:58 PM, Reco wrote:
> 	Hi.
> On Wed, Nov 07, 2018 at 02:27:32PM +0100, john doe wrote:
>> On 11/7/2018 7:26 AM, Reco wrote:
>>> 	Hi.
>>> On Tue, Nov 06, 2018 at 08:44:08PM +0100, john doe wrote:
>>>> On 11/6/2018 5:05 PM, john doe wrote:
>>>>> On 11/6/2018 4:02 PM, Reco wrote:
>>>>>> 	Hi.
>>>>>> On Tue, Nov 06, 2018 at 03:04:25PM +0100, john doe wrote:
>>>>>>> Hi,
>>>>>>> I'm trying to install Debian Stretch using a preseeding file.
>>>>>>> All of this is with Qemu and  I'm not sure how  to pass the path of the
>>>>>>> preseed file:
>>>>>>> qemu-system-x86_64 -drive file=debian.img,format=raw -cdrom
>>>>>>> debian-9.5.0-amd64-netinst.iso -boot d -nographic -kernel vmlinuz
>>>>>>> -append "console=ttyS0,115200n8 auto=true priority=critical
>>>>>>> DEBIAN_FRONTEND=text preseed=preseed.cfg" -initrd initrd.gz
>>>>>>> The d-i can not find the preseed.cfg file, as anyone has any idea on how
>>>>>>> I can install Debian with a preseed file using qemu?
>>>>>> Since you do not specify "-net", that means "-net user".
>>>>>> As [1] shows us, "-net user" comes with built-in TFTP server.
>>>>>> So, you either replace your "-kernel", "-initrd" and "-append" with TFTP
>>>>>> invocation, and install Debian as if it was installed from TFTP.
>>>>>> Or rebuild d-i initrd to include your preseed.cfg.
>>>>> Thank you, I didn't think to install debian using PXE with qemu acting
>>>>> as tftp server.
>>>> Ok -- I have downloaded/extracted netboot.tar.gz and I use the following
>>>> command:
>>>> "qemu-system-x86_64" -drive file=debian.img,format=raw -m 8126 -accel
>>>> hax   -machine q35 -boot n -device e1000,netdev=n1 -netdev
>>>> user,id=n1,tftp=$PWD,bootfile=/pxelinux.0 -nographic
>>>> I get the error "could not read the boot disk".
>>>> Any thoughts on what I'm missing?
>>> Both tcpdump and strace outputs? I know, I know ;)
>>> This does not look right; "bootfile=/pxelinux.0".
>>> You're assumed to have pxelinux binary, its libraries, pxelinux.cfg, etc
>>> in the same directory, and to point QEMU there.
>> Taking care of the symlink I now get:
>>   [Link:up, TX:0 TXE:0 RX:0 RXE:0]
>> Configuring (net0 52:54:00:12:34:56)..... ok
>> net0: gw
>> Next server:
>> Filename: /pxelinux.0
>> tftp:// ok
>> pxelinux.0 : 80 bytes [PXE-NBP]
>> Looks like the command is working, what I need to understand is how to
>> configure Debian netbooting using pxe.
>> So I guess my question is:
>> Other then netboot.gz (downloaded and extracted), what else do I need?
> To follow this guide, for instance:
> http://www.briancarpio.com/2012/04/04/system-automation-part-1/
> There's no need to configure another TFTP server, QEMU takes care of it
> already. But appropriate placing of syslinux binaries, configuration
> files, etc - it's all there.

For the time being I use an http server running locally

If you have python handy:

$ python -m <[SimpleHTTPServer]>|<[http.server]>

Depending of the python version use one or the other module.
The idea is to fetch the preseed file from an http server running
locally or not.

So the command I ended up using is:

$ qemu-system-x86_64 -drive file=debian.img,format=raw -nographic
-serial telnet:localhost:5555,server -cdrom
debian-9.5.0-amd64-netinst.iso -kernel vmlinuz -append
"console=ttyS0,115200n8 DEBIAN_FRONTEND=text auto=true priority=critical
preseed/url=http://localhost:8000"; -initrd initrd.gz

All of this is done on Windows, the telnet redirection is probably not
needed on linux! :)

Thanks to Reco for his help.

As an aside, with the above command on the installed system the output
of the terminal is not redirected through the serial console.
The below line needs to be manually edited in '/etc/default/grub' by
appending 'console=ttyS0,115200n8':





John Doe

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