Re: [uml-user] Newbie Question - What am I doing wrong ? (Tutorial)

[<p_s...@ya...>]

Thanks for the very detailed response Douglas, I`ll
certainly be putting it into practice.

However, as far as I can tell, I still need to compile
the same kernel/patch combination - 2.4.23-djc3-7um,
because this is what my virtual host uses, and I want
to do some _kernel_ _module_ compilation (simple
netfilter hooks). I`m having trouble getting my kernel
modules to compile on my host so I thought if I could
develop the same kernel source tree (2.4.23-djc3-7um) 
on my local machine then I could practice getting
things working on that first. But if the basics, like
"make linux ARCH=um", are not working then I suppose I
can`t entrust the building of modules against this
source.

Somebody must have got  2.4.23-djc3-7um to compile -
it`s on my virtual host...


 --- Douglas Phillipson <do...@in...> wrote: >
Peter Smith wrote:
> > I`ve gone to the User Mode Linux site and followed
> the
> > How To on compiling a kernel but "make linux
> ARCH=um"
> > results in the following error -
> > 
> > ...
> > ../../lib/libfreeswan/ultoa.c:19:22: internal.h:
> No
> > such file or directory
> > make[2]: *** [ultoa.o] Error 1
> > make[2]: Leaving directory
> > `/root/uml/linux-2.4.23/net/ipsec'
> > make[1]: *** [_subdir_ipsec] Error 2
> > make[1]: Leaving directory
> > `/root/uml/linux-2.4.23/net'
> > make: *** [_dir_net] Error 2
> > 
> 
> I don't think you want to approach UML that way, try
> this instead...
> 
> I'm working on a procedure for Redhat.  Here is a
> start:
> 
> First, I've found a little explanation goes a long
> way.  We are going to:
> 
> 1) Create and install a new UML Kernel RPM.
>     This RPM is the UML kernel that will boot on top
> of our host OS.
>     You do NOT boot your machine from this kernel!
> 
> 2) Patch our host machine with the SKAS patch.
> 3) Build a new kernal for the host machine with a
> "tuntap" device.
>     Item 2 and 3 go together because they both
> require building a new
>     Kernel so just do both at once and build only
> one kernel.  This
>     Kernel is your host OS kernel.  You will boot
> your machine on it.
>     The SKAS patch supposedly gives much better
> performance to the UML.
>     The "tuntap" device is required for your UML
> kernel to communicate
>     to the outside world.  The "tuntap" device was
> automatically
>     installed in the UML kernel when I made it.  It
> also needs to
>     be in your host Kernel.  Hence we need to build
> a new host kernel.
> 
> 4) Use umlbuilder_gui to create and populate the UML
> filesystem.
>     umlbuilder_gui allows you to fill in the blanks
> with the right stuff
>     to create a filesystem.  It installs all the
> RPM's that you will
>     copy from your Redhat CD's on to your hard
> drive.  It also creates a
>     startup script called "control" which boots your
> UML Kernel on top
>     of your host OS kernel.
> 
> Note:  When I say "do this as you" I mean do it as
> the user you are 
> logged in as.  You should NOT be logged in as root
> except when 
> installing RPM's!
> 
>
---------------------------------------------------------------------
> 1) Create a new UML Kernel RPM with a 2.4.23 kernel:
> 
> Grab
> http://umlbuilder.sourceforge.net/uml-custom.spec
> 
>     Edit and modify the lines in  uml-custom.spec
> that refers to the 
> kernel version.
> 
> I.E.
> 
> %define kernelversion 2.4.23     << I changed this
> from 22 to 23
> %define umlversion    1          << I changed this
> from 6 to 1
> 
>     Create a $HOME/.rpmmacros file and add the
> following to it:
> 
>          %_topdir /home/<your username>/rpm
>          %packager Douglas Phllipson <your email
> address>
> 
>     Creating a .rpmmacros file is required to set
> the "topdir"
>     variable so you can run the build as you, not
> ROOT.  After
>     creating the UML RPM you have to be root to
> install it though.
> 
>     So in my case it says the $HOME/.rpmmacros file
> contains only:
> 
>         %_topdir /home/phillipd/rpm
>         %packager Douglas Phllipson
> <do...@in...>
> 
>     Now lets make the rpm (do all this as you, not
> root):
> 
>     mkdir rpm
>     cd rpm
>     mkdir BUILD RPMS SOURCES SPECS SRPMS
> 
> Run the following command as you (not root, takes a
> long time):
> 
>     CONFIGCOPY=x CONFIG=xconfig rpmbuild -ba
> ../uml-custom.spec
> 
>     Install the new uml kernel you just made (as
> root):
> 
> rpm -Uvh /home/<your user 
> name>/rpm/RPMS/i386/UML-2.4.23.custom.1um-1.i386.rpm
> 
>     So in my case it was (as root):
> 
> rpm -Uvh
>
/home/phillipd/rpm/RPMS/i386/UML-2.4.23.custom.1um-1.i386.rpm
> 
> OK, that installed the UML kernel we will boot on
> top of our host OS. 
> Dont  do anything with it just yet though.  We need
> to patch and build 
> your host Kernel with the SKAS patch and add the
> "tuntap" device module.
>
-----------------------------------------------------------------------------
> 
> 2) and 3) Patch our host machine with the SKAS patch
> and add the tuntap 
> module:
> 
> Grab a stock 2.4.23 Kernel from kernel.org or use
> the command below:
> 
> wget
>
http://www.kernel.org/pub/linux/kernel/v2.4/linux-2.4.23.tar.bz2
> 
> unbzip and untar it:
> 
>     bzip2 -d linux-2.4.23.tar.bz2
>     tar xvf linux-2.4.23.tar
> 
> Grab the skas patch from:
>
http://aleron.dl.sourceforge.net/sourceforge/user-mode-linux/host-skas3.patch
> 
> Become root (su)...
> 
> Move the 2.4.23 source tree to /usr/src:
> 
>     mv linux-2.4.23 /usr/src
> 
>     cd /usr/src/linux-2.4.23
> 
> Save the host-skas3.patch here in
> /usr/src/linux-2.4.23
> 
>     cp $HOME/host-skas3.patch .
> 
> Grab your old config file from your booted kernel:
> 
>     make oldconfig
> 
> This deposits a ".config" file in your current
> directory based on your 
> old kernel.
> 
> Edit the new .config file and add SKAS to the end of
> the EXTRAVERSION 
> line so it looks like this:
> 
> EXTRAVERSION = SKAS
> 
> Patch the kernel source:
> 
>     cat host-skas3.patch | patch -p1
> 
> Now run "make xconfig" and make sure that the
> "tuntap" device is 
> selected as a module. When the Linux Kernel
> Configuration GUI pops up, 
> click the "Network Device Support" button and click
> the "M" gadget for 
> the "Universal TUN/TAP device driver support".  Now
> is a good time to 
> select any other options you want but I would really
> limit the 
> 
=== message truncated === 

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