On Tue, 1 Aug 2006, TongKe Xue wrote:
> Original Belief: I can use UML as a virtual machine; jail untrusted
> processes.
>
> Let's say I am a user U, on a machine M running Linux.
> I run an instance, UML1 of User Mode Linux.
> Within this instance of UML1, I create a new user "jailedUser".
> "j
Please forgive me for interpreting without suggesting how to fix, but the
interpretation might be useful. Is there any chance of trying out the
2.6.16 UML kernel on a 2.6.16 host? Version skew, particularly backwards,
is very plausible as an explanation for all of these. Also be sure that
th
On Fri, 10 Mar 2006, Julius Schwartzenberg wrote:
> I was wondering if it was possible to have multiple UMLs share a single
> tap device. My goal is to have one subnet on tap0 in which all the UMLs
> are too, so you get one big virtual ethernet network.
I doubt it's possible, since each UML nee
On Fri, 13 Jan 2006, Maruthi Narayanaswamy wrote:
> I am able to ssh to host from UML thru TUNTAP and I also I am able to
> communicate between UMLs thru switch daemon.
>
> Now the problem is, I am unable to telnet/ssh to UMLs directly from the
> local LAN. I am not sure as to how to go about.
On Fri, 6 Jan 2006, Xinhuan Zheng wrote:
> Does anyone know how to make a yum repository for, say, rhel3?
I found a reference, for Red Hat, that looks pretty complete:
http://www.webmo.net/support/yum_repository.html
For those of us who aren't doing the hat thing, yum (Yellow Dog Updater) i
On Thu, 29 Dec 2005, [EMAIL PROTECTED] wrote:
> Problem: I don't get the clue how to build an external module (like IPsec).
> The standard modules work well, but I don't seem to be able to apply an
> external module patch on the uml kernel's source code.
I haven't tried building external modules
On Mon, 19 Dec 2005, Blaisorblade wrote:
> On Monday 19 December 2005 21:19, Jim Carter wrote:
> The problem lies in the #ifdef mapping ntohll to _bswap64 - in 2.6.13 it was
> changed in a wrong way (and not by anybody present here - somebody went with
> a "nice cleanup"
On Tue, 20 Dec 2005, Michael Stowe wrote:
> I'm a recent convert to UML for VDS/PS hosting and have talked with Jeff
> about providing RPMs of UML kernels.
> I'd like to ask for input on a standardized location for the kernel and
> modules to be installed to as well as any patches you would lik
On Fri, 16 Dec 2005, Blaisorblade wrote:
> On Thursday 15 December 2005 21:15, Jeff Dike wrote:
> > On Thu, Dec 15, 2005 at 05:26:44PM +0100, Blaisorblade wrote:
> > > The problem is that the same declaration is used in kernel sources. I.e.,
> > > we have (likely) COW files generated from 64-bit m
On Mon, 24 Oct 2005, Serge Goodenko wrote:
> > Also, HZ (i.e. the timer interrupt) is implemented using signals (i.e.
> > alarm()), which are both slow and not precise (no more than host
> > jiffies).
> hm.. this suggests that maybe it would be really better not to use
> jiffies in UML (in my
On Mon, 26 Sep 2005, Jeff Dike wrote:
> On Mon, Sep 26, 2005 at 05:24:30PM -0700, Robin Lee Powell wrote:
> > However, as soon as I run sshd by any means, the guest hangs. I
> > have no idea what to do about this. Help?
>
> If not, then it might be an entropy shortage, and the UML random driver
On Wed, 3 Aug 2005, Craig O'Keefe wrote:
> Is anyone aware of a limit to the number of telnet sessions UML can
> support. We are seeing our >60 never come up. Does anyone know of where
> this is configured?
Each telnet-rlogin-ssh session requires a pseudo-tty master+slave, and a
2.4.x kernel for
On Fri, 22 Apr 2005, Ragnar Lonn wrote:
> The problem here is that there can only be ~250 routing tables configured
> on the machine. This means that we can only emulate ~250 separate client
> machines (boxes with their own MAC addresses) on a single PC. We would
> like to emulate about 1000 separa
On Thu, 14 Apr 2005, itamar wrote:
> It´s possible to use the same TMPDIR for all uml´s in the host ?
> mkdir /tmp/uml
> mount -t tmpfs -o mode=1777,size=512M none /tmp/uml
> TMPDIR=/tmp/uml linux mem=512M ...
Certainly this is possible, but you've allowed space for only one guest.
If there are
On Wed, 13 Apr 2005, Fabio Ricci wrote:
> Which is the best for handling /dev fs?
> i have tried to use udev with hotplug but it seems that the boot phase is too
> much long,
> instead with devfs i cant see some link on /dev.
In kernel 2.6.x, devfs is no longer Politically Correct, but as you say
On Sat, 9 Apr 2005, Scott Granados wrote:
> However, when I run ssh, both the included openssh and the ssh.com verion I
> get a quote "/dev/ptmx no such file or directory."
>
> When I do a ls -al /dev/ptmx I get a device with a major and minor of 5 and 2
> which the man page confirms.
Does direc
On Fri, 8 Apr 2005, Scott Granados wrote:
> Hi, I wonder if anyone has available any more current root images.
> The ones on the uml site are helpful but out of date a bit.
> I'd be interested possibly in new redhat or centos or slackware images. I've
> not figured out the process to make my own y
On Tue, 5 Apr 2005, Rus Foster wrote:
> I've just compiled up a 2.4.29 guest kernel and having a problem that is
> typing "reboot" the guest does more of a power off than a reboot. Anyone
> got a fix for this?
I saw the same thing in 2.6.8 host & guest, from the SuSE distro. If you
run your U
On Fri, 1 Apr 2005, Krisztian PIFKO wrote:
> > What´s is the best way to enable iptables on a guest machine ?
> the same like everywhere: have iptables support in the kernel and
> tune it with the userspace utilities.
Or compile iptables and all the helper routines as modules, and install
those m
On Thu, 24 Mar 2005, Jonathan S. Romero wrote:
> Can anyone point me towards info on debugging UML guests using GDB. I
> read somewhere online that if you compile UML with debugging enabled,
> that you can get a debugging session in an xterm. In the meantime I'm
> going to work on familiarizing
On Sun, 20 Mar 2005, Zev Benjamin wrote:
> a 2.6.10 UML, that file shows devices with names like ubda and ubdb1. Under a
> 2.4.27 UML, that file shows devices with names like ubd/disc0/disk and
> ubd/disc1/part1. The problem is that I'm trying to do the install under
> 2.6.10 (afs drivers don't
> [EMAIL PROTECTED] said:
> > I have 4go on my server. Only 800 mo are use. When I launch a uml
> > instance with mem=256M param that work fine. But when launch a uml
> > instance with mem=512M, I get this message : SegFault
Oops, in my first answer to this posting I made a mistake, and my
On Fri, 11 Mar 2005, Jean-Michel Caricand wrote:
> I have 4go on my server. Only 800 mo are use. When I launch a uml
> instance with mem=256M param that work fine. But when launch a uml
> instance with mem=512M, I get this message : SegFault
4go means quatre giga-octets, right?
As a def
On Sun, 6 Mar 2005, Krisztian PIFKO wrote:
> could someone please tell me how much memory an uml consumes
> if the temp dir for the unlinked temp files is on tmpfs?
>
> for example does a 64M uml use 2*64 megs of ram this way?
My UML is configured with 120 MB simulated RAM. Host and guest have
On Fri, 4 Mar 2005, Scott Granados wrote:
> ...I start uml and all goes well until after starting
> innd or the last service depending. I get, respawning to fast, no
> processes left, holding for five minutes.
> I realize that this is likely a problem in the inittab and that the getty
> is th
On Fri, 4 Mar 2005, Radu Brumariu wrote:
> does anybody know of any possibility to emulate a serial connection
> between 2 UMLs running on the same host ?
The howto originally written by Rusty Russell has an example which may be
relevant:
http://user-mode-linux.sourceforge.net/UserModeLinux-HOW
On Thu, 3 Mar 2005, Adrian Phillips wrote:
> >>>>> "Jim" == Jim Carter <[EMAIL PROTECTED]> writes:
>
> Jim> If a very sharp hacker "gets root" on the UML guest, he can...
> Jim> chroot jail, he can import statically linked
On Thu, 3 Mar 2005, Oliver Baltz wrote:
> my UML hangs while intensive processes that use the HDD. For example:
> rgrep, upgrade,...
>
> UML-Hostsystem: 2.4.27-1-386, Intel ICH5 SATA 150-Controller
> UML: 2.4.26-3um-1
I had a similar experience. I configured the UML with 256MB RAM, and put
the
On Thu, 3 Mar 2005, Jeff Dike wrote:
> [EMAIL PROTECTED] said:
> > As I understand it, the kernel adds hardware RNG data to the entropy
> > pool if the device is available.
>
> Can you give me a pointer to code that does this? I see no hint in random.c
> that it takes entropy from the hardware r
On Wed, 2 Mar 2005, Jeff Dike wrote:
> I wrote a little HW random number generator based on hw_random.c. It hooks
> itself up to major 10, minor 183, which seems to be the standard for a
> HW RNG. The standard name for this seems to be /dev/hwrng.
Unfortunately many Intel chipsets lack the har
On Wed, 2 Mar 2005, Maarten wrote:
> Out of curiosity, is a 'default' SKAS-enabled guest (and without the host-fs
> kernel option) safe enough as a sandbox to let untrusted users in, or are
> additional measures in order to really secure it (or more paranoia ;-) ?
> Ie. how difficult is it to ga
On Wed, 2 Mar 2005, Nuutti Kotivuori wrote:
> If swap is enabled for a virtual machine, and the virtual machine
> actually swaps something, swapoff at shutdown hangs the machine.
Here's another nasty hang that I first blundered into last night, which
probably is unrelated but which might be hel
> On Sunday 27 February 2005 08:42, Eric Wong wrote:
> > Kernel command line: ubd0=/tmp/root_fs root=98:0
> > What does the root=98:0 mean?
The major and minor device numbers of /dev/ubda. The kernel needs these to
mount the root, if there is no initrd to take care of that. I'm pretty
sure tha
On Tue, 1 Mar 2005, nils toedtmann wrote:
> Unfortunately, within my FC3 UMLs some binaries now crash :-(
> While sysV startup (including network, cron, syslog, sshd),
> bash, find, host, ping, ... all work fine, others like
> /bin/rpm or /bin/ls segfault. /usr/bin/vim also segfaults,
> but when
On Mon, 28 Feb 2005, Adil Mujeeb, Noida wrote:
> > But if I telnet with :
> > telnet ::1 9001
> > it gives message connection refused.
>
> >>> I have mentioned that "I have built the UML binary with ipv6 support".
> When compiling the UML, i have selected the option ipv6 support and add it
> in
On Sat, 26 Feb 2005, Adil Mujeeb, Noida wrote:
> I am using 2.4.26 linux source and patch it with uml-patch-2.4.26-3 patch.
> I have built the uml binary with ipv6 support and my host has ipv6 module
> loaded.
> --snip--
> But if I telnet with :
> telnet ::1 9001
> it gives message connection ref
On Sun, 27 Feb 2005, Halldór Gylfason wrote:
> I was just setting up the 2.6.9 version of UML, but when booting up the
> terminals did not come up, and INIT complained with this remark:
>
> INIT: Id "0" respawning too fast: disabled for 5 minutes
> ..
>
> Earlier posts on this mailing list indic
On Thu, 24 Feb 2005, Jurgen Defurne wrote:
> Is there a way to allocate always the same pty to the same instance of UML ?
>
> That way, I could eg. startup a screen session wich connects automatically a
> number of consoles to all allocated ptys.
According to the UML howto, if you make something
On Thu, 24 Feb 2005, Gordon Russell wrote:
> We have a cluster of 5 machines, each running about 15 UMLs. Things
> seem to run great for a while, then performance of the UMLs seems to
> die for a while.
> --snip--
> Machines are all 1GB or better, 2GHz or better, on a 0.1GB network
> backbone.
W
On Thu, 24 Feb 2005 [EMAIL PROTECTED] wrote:
> I do notice that it prints out "Partition check :
> ubda : unknown partition table"
If you use a partitioning tool, like Gnu parted, from within the guest, you
can actually partition your simulated disc. After that, this
On Mon, 21 Feb 2005, Peder Chr. Nørgaard wrote:
> durned thing. A closer investigation showed that the installation hangs in
> program "ipsec rsasigkey" reading /dev/random.
>
> Now I have studied the driver/char/random.c for a while. It looks as if it
> works allright, also in user-mode-linu
On Sat, 19 Feb 2005, Millis Miller wrote:
> I am having a strange problem when trying to ping a UML guest from the
> host, right after I have the guest eth0 come up (both Debian).
> --snip--
> host#: ping
>
> and the guest UML then immediately bombs out with a segmentation fault.
>
> (I
On Fri, 11 Feb 2005, Fermín Galán Márquez wrote:
> mount root_fs /mnt/uml -o loop
> vi /mnt/uml/etc/hosts (or whatever)
> ...
> umount /mnt/uml
>
> I wonder if something similar could be done with COW-ed filesystems (created
> by a UML booting or with the uml_mkcow utility).
I've been doing "uml
On Mon, 7 Feb 2005, Blaisorblade wrote:
> On Sunday 06 February 2005 06:43, Jim Carter wrote:
> > I'm just getting started with UML, and can't get past square 1. UML
> > just gives itself SIGSTOP. Version info:
> > --snip--
> Well, this problem was described
On Sun, 6 Feb 2005, Jeff Dike wrote:
> [EMAIL PROTECTED] said:
> > I'm just getting started with UML, and can't get past square 1. UML
> > just gives itself SIGSTOP. Version info:
> With bizarre behavior like this, I would suspect the host.
> Is this a kernel that's known to be able to run UML?
I'm just getting started with UML, and can't get past square 1. UML
just gives itself SIGSTOP. Version info:
CPU:i86, Pentium 3 Mobile (Coppermine), 1.0 GHz
System: Dell Inspiron 4100, 256 MB RAM
Distro: SuSE 9.2
Host kernel:2.6.8 (SuSE build: kernel-default-2.6.8-
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