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

[Tony Su <to...@su...>]

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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