Re: [uml-user] how to build programs for running in UML

[Han <kee...@gm...>]

I was able to manually install more packages after the "debootstrap"
created the basic rootfs. Now I have a much more complete rootfs and was
able to run the programs I compiled earlier on the host.

thanks for all your help.


On Thu, Aug 8, 2013 at 8:56 AM, Tony Su <to...@su...> wrote:

> If your rootfs is incomplete I've generally speculated it was designed to
> run on a similar Host and likely would need bind mounts.
>
> The following is where I get complete fs which can run independently on
> any Host
> Http://openvz.org/Download/template/precreated
>
> Although the fs are built for openvz  I've used them for UML, LXC.
>
> HTH
> Tony
> On Aug 7, 2013 11:10 AM, "Han" <kee...@gm...> wrote:
>
>>
>>
>> On Tue, Aug 6, 2013 at 7:51 PM, Michael Richardson <mc...@sa...>wrote:
>>
>>>
>>> Han <kee...@gm...> wrote:
>>>     > I am trying to build and run some of my C programs in UML.  One
>>> way I tried is
>>>     > to build (i.e. compile) the program on the host,  then run it in
>>> UML.  The
>>>     > problem is that the UML rootfs I used lacks many of the /usr/lib/
>>> shared
>>>     > libraries, hence the program failed to run.
>>>
>>> Well, you have to install the things you need then.
>>>
>>>     > My question is:  what is the best practice to build and run C
>>> programs for UML?
>>>     >  Do people normally compile the program on the host and then run
>>> it in UML?
>>>     > Or  compile the program directly in UML and then run it?
>>>
>>> I make sure I have the same operating system and 32/64-bit-ness, and I
>>> use
>>> hostfs, and I use "make DESTDIR=/path/to/my/uml/instance install".
>>>
>>
>> [Han] in my case, the host is using a different linux kernel and
>> different 32/64-bit-ness.  And I can't change that.  And I also cannot
>> mount the UML rootfs (don't have permission) to add things from the host.
>>
>> the linux machine I used to build the UML rootfs is different from the
>> linux host that I run the UML.
>>
>>
>>>
>>>     > If folks compile the C programs in UML directly,  where the "gcc"
>>> comes from?
>>>     >  Is it built part of the rootfs,  or some add-ons?  Any pointers
>>> for that?
>>>
>>> It's part of the rootfs, and you have a complete operating system there.
>>> You use yum or apt or yast2 to install whatever you need.
>>>
>>
>> [Han]  I don't have the network connection from inside the UML yet. Need
>> to set up that first and try to install things.
>>
>> thanks.
>>
>>
>>>
>>> --
>>> ]               Never tell me the odds!                 | ipv6 mesh
>>> networks [
>>> ]   Michael Richardson, Sandelman Software Works        | network
>>> architect  [
>>> ]     mc...@sa...  http://www.sandelman.ca/        |   ruby on
>>> rails    [
>>>
>>>
>>
>>
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