user-mode-linux-user

Re: [uml-user] sparse files as root images

[richard -r. w. <ric...@gm...>]

Hi,

On Mon, Dec 5, 2011 at 7:20 PM,  <ro...@mm...> wrote:
> dd if=/dev/zero of=$OUTFS bs=1024 count=1 seek=$((20*1024*1024-1))

Does it work if the filesystem is not sparse?

> but I'm having kernel panics (not syncing) whenever I try to run various
> commands inside UML.

Please post the complete panic.

> So far I got kernel panics with top and updatedb.
>
> Please consider that I am able to boot into UML. The trouble begins when
> I'm trying to actually use the beast.
>
> Background:
> kernel.3.1.4, built with defconfig ARCH=um
> host OS = Slackware.13.37
> Guest OS = Slackware.13.37
> Host RAM=256MB
> Guest RAM= mem=128M

What is the exact command line?

-- 
Thanks,
//richard

[uml-user] sparse files as root images

[<ro...@mm...>]

Hi List,

I'm trying to create a root image.
So far I'm creating the underlying file as a sparse file with:

dd if=/dev/zero of=$OUTFS bs=1024 count=1 seek=$((20*1024*1024-1))

but I'm having kernel panics (not syncing) whenever I try to run various
commands inside UML.

So far I got kernel panics with top and updatedb.

Please consider that I am able to boot into UML. The trouble begins when
I'm trying to actually use the beast.

Background:
kernel.3.1.4, built with defconfig ARCH=um
host OS = Slackware.13.37
Guest OS = Slackware.13.37
Host RAM=256MB
Guest RAM= mem=128M

Thank you for your time,
-Stathis

Re: [uml-user] Can i run uml in the background ?

[richard -r. w. <ric...@gm...>]

On Fri, Dec 2, 2011 at 11:39 PM, ning ji <ni...@ho...> wrote:
> without sudo, i got this

Is your disk image only root-readable?
Nobody runs UML as root.

-- 
Thanks,
//richard

Re: [uml-user] Can i run uml in the background ?

[<cl...@cl...>]

Hello,
Screen is often used with uml:
For a linux uml binary and uml_basic_squeeze as root file system, you can
use screen as below:

  screen -dmS name_you_want linux ubda=uml_basic_squeeze

The screen starts as a daemon, and to bring it back:

  screen -r name_you_want


Once you are in the screen, you can daemonize it again with:

  Ctrl-A d




> Hi Ning Ji,
>
> On Fri, Dec 2, 2011 at 22:10, ning ji <ni...@ho...> wrote:
>> but when i run
>>
>>  #sudo ./umlinux ubda=./fs6 mem=128M
>> eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51 &
>>
>> i got this
>>
>> [1]+  Stopped                 sudo ./umlinux ubda=./fs6
>> mem=128M
>> eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51
>>
>
> A programm running in the background must not attempt to perform any
> I/O to the terminal, otherwise it gets a STOP signal.
>
> If you want to run UML in the background you will have to: (warning:
> untested)
>
> 1) redirect the initial boot console output to a file:
>
>     umlinux .... > boot.log
>
> 2) use the "con=..." option to start the Linux consoles in a XTerm, or
>    network port, or anything that does not do I/O in the shell
>    terminal.
>
> best regards,
> Riccardo
>
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure
> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> _______________________________________________
> User-mode-linux-user mailing list
> Use...@li...
> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
>

Re: [uml-user] Can i run uml in the background ?

[ning ji <ni...@ho...>]

without sudo, i got this
[    0.170000]  ubda: unknown partition table[    0.170000] Warning: Assigning a globally valid ethernet address to a device[    0.170000] You should set the 2nd rightmost bit in the first byte of the MAC,[    0.170000] i.e. 02:50:f9:00:00:66[    0.170000] Netdevice 0 (00:50:f9:00:00:66) :[    0.170000] TUN/TAP backend - IP = 10.50.181.51[    0.200000] EXT3-fs (ubda): error: couldn't mount because of unsupported optional features (240)[    0.210000] EXT2-fs (ubda): error: couldn't mount because of unsupported optional features (244)[    0.220000] EXT4-fs (ubda): INFO: recovery required on readonly filesystem[    0.220000] EXT4-fs (ubda): write access unavailable, cannot proceed[    0.300000] UDF-fs: No partition found (1)[    0.330000] NILFS: Can't find nilfs on dev ubda.[    0.360000] GFS2: gfs2 mount does not exist[    0.360000] List of all partitions:[    0.360000] 6200          100000 ubda  driver: uml-blkdev[    0.360000] No filesystem could mount root, tried:  reiserfs ext3 ext2 ext4 squashfs vfat msdos iso9660 ntfs fuseblk udf nilfs2 btrfs gfs2 gfs2meta[    0.360000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)[    0.360000] 0fc6bedc:  [<084d18bc>] dump_stack+0x1c/0x20[    0.360000] 0fc6bef4:  [<084d190d>] panic+0x4d/0x13f[    0.360000] 0fc6bf28:  [<08048ca5>] mount_block_root+0x20d/0x21c[    0.360000] 0fc6bf78:  [<08048d00>] mount_root+0x4c/0x54[    0.360000] 0fc6bf9c:  [<08048e54>] prepare_namespace

> From: ro...@gm...
> To: use...@li...
> Date: Fri, 2 Dec 2011 15:50:50 -0600
> Subject: Re: [uml-user] Can i run uml in the background ?
> 
> On Friday 02 December 2011 15:10:35 ning ji wrote:
> > Guess the answer is yes,but when i run
> >  #sudo ./umlinux ubda=./fs6 mem=128M
> > eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51 & i got this
> > [1]+  Stopped                 sudo ./umlinux ubda=./fs6 mem=128M
> > eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51
> > 
> > Any hints pls ?Thanks !
> 
> Why are you running this as root? There are safe ways to set up 
> networking while maintaining reduced privilege in the UML instance 
> itself.
> 
> Can you background it as non-root?
> -- 
>     Offlist mail to this address is discarded unless
>     "/dev/rob0" or "not-spam" is in Subject: header
> 
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure 
> contains a definitive record of customers, application performance, 
> security threats, fraudulent activity, and more. Splunk takes this 
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> _______________________________________________
> User-mode-linux-user mailing list
> Use...@li...
> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
 		 	   		  

Re: [uml-user] Can i run uml in the background ?

[ning ji <ni...@ho...>]

Thanks for the hint, i'll try it later, :)

> Date: Fri, 2 Dec 2011 15:50:59 -0600
> Subject: Re: [uml-user] Can i run uml in the background ?
> From: cl...@cl...
> To: ric...@gm...
> CC: ni...@ho...; use...@li...
> 
> Hello,
> Screen is often used with uml:
> For a linux uml binary and uml_basic_squeeze as root file system, you can
> use screen as below:
> 
>   screen -dmS name_you_want linux ubda=uml_basic_squeeze
> 
> The screen starts as a daemon, and to bring it back:
> 
>   screen -r name_you_want
> 
> 
> Once you are in the screen, you can daemonize it again with:
> 
>   Ctrl-A d
> 
> 
> 
> 
> > Hi Ning Ji,
> >
> > On Fri, Dec 2, 2011 at 22:10, ning ji <ni...@ho...> wrote:
> >> but when i run
> >>
> >> Â #sudo ./umlinux ubda=./fs6 mem=128M
> >> eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51 &
> >>
> >> i got this
> >>
> >> [1]+  Stopped                 sudo ./umlinux ubda=./fs6
> >> mem=128M
> >> eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51
> >>
> >
> > A programm running in the background must not attempt to perform any
> > I/O to the terminal, otherwise it gets a STOP signal.
> >
> > If you want to run UML in the background you will have to: (warning:
> > untested)
> >
> > 1) redirect the initial boot console output to a file:
> >
> >     umlinux .... > boot.log
> >
> > 2) use the "con=..." option to start the Linux consoles in a XTerm, or
> >    network port, or anything that does not do I/O in the shell
> >    terminal.
> >
> > best regards,
> > Riccardo
> >
> > ------------------------------------------------------------------------------
> > All the data continuously generated in your IT infrastructure
> > contains a definitive record of customers, application performance,
> > security threats, fraudulent activity, and more. Splunk takes this
> > data and makes sense of it. IT sense. And common sense.
> > http://p.sf.net/sfu/splunk-novd2d
> > _______________________________________________
> > User-mode-linux-user mailing list
> > Use...@li...
> > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
> >
> 
 		 	   		  

Re: [uml-user] Can i run uml in the background ?

[/dev/rob0 <ro...@gm...>]

On Friday 02 December 2011 15:10:35 ning ji wrote:
> Guess the answer is yes,but when i run
>  #sudo ./umlinux ubda=./fs6 mem=128M
> eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51 & i got this
> [1]+  Stopped                 sudo ./umlinux ubda=./fs6 mem=128M
> eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51
> 
> Any hints pls ?Thanks !

Why are you running this as root? There are safe ways to set up 
networking while maintaining reduced privilege in the UML instance 
itself.

Can you background it as non-root?
-- 
    Offlist mail to this address is discarded unless
    "/dev/rob0" or "not-spam" is in Subject: header

Re: [uml-user] Can i run uml in the background ?

[ning ji <ni...@ho...>]

yes, when i add "con=pts" it starts working in the background,Thanks very much !


> Date: Fri, 2 Dec 2011 22:15:43 +0100
> Subject: Re: [uml-user] Can i run uml in the background ?
> From: ric...@gm...
> To: ni...@ho...
> CC: use...@li...
> 
> Hi Ning Ji,
> 
> On Fri, Dec 2, 2011 at 22:10, ning ji <ni...@ho...> wrote:
> > but when i run
> >
> >  #sudo ./umlinux ubda=./fs6 mem=128M
> > eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51 &
> >
> > i got this
> >
> > [1]+  Stopped                 sudo ./umlinux ubda=./fs6 mem=128M
> > eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51
> >
> 
> A programm running in the background must not attempt to perform any
> I/O to the terminal, otherwise it gets a STOP signal.
> 
> If you want to run UML in the background you will have to: (warning: untested)
> 
> 1) redirect the initial boot console output to a file:
> 
>     umlinux .... > boot.log
> 
> 2) use the "con=..." option to start the Linux consoles in a XTerm, or
>    network port, or anything that does not do I/O in the shell
>    terminal.
> 
> best regards,
> Riccardo
 		 	   		  

Re: [uml-user] Can i run uml in the background ?

[Riccardo M. <ric...@gm...>]

Hi Ning Ji,

On Fri, Dec 2, 2011 at 22:10, ning ji <ni...@ho...> wrote:
> but when i run
>
>  #sudo ./umlinux ubda=./fs6 mem=128M
> eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51 &
>
> i got this
>
> [1]+  Stopped                 sudo ./umlinux ubda=./fs6 mem=128M
> eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51
>

A programm running in the background must not attempt to perform any
I/O to the terminal, otherwise it gets a STOP signal.

If you want to run UML in the background you will have to: (warning: untested)

1) redirect the initial boot console output to a file:

    umlinux .... > boot.log

2) use the "con=..." option to start the Linux consoles in a XTerm, or
   network port, or anything that does not do I/O in the shell
   terminal.

best regards,
Riccardo

[uml-user] Can i run uml in the background ?

[ning ji <ni...@ho...>]

Guess the answer is yes,but when i run
 #sudo ./umlinux ubda=./fs6 mem=128M eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51 &
i got this
[1]+  Stopped                 sudo ./umlinux ubda=./fs6 mem=128M eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51

Any hints pls ?Thanks !
 		 	   		  

Re: [uml-user] Cannot bringup DHCP (2.6.39 kernel + Debian 5.0 rootfs)

[ning ji <ni...@ho...>]

Antoine,
We cannot setup another DHCP server to run UML, even if it's not connected to the corporate network.How i wish you have an instruction of dhcp relay for UML in your site, :)
Thanks for all the replies !

> Date: Thu, 1 Dec 2011 14:32:32 +0700
> From: an...@na...
> To: ni...@ho...
> CC: use...@li...
> Subject: Re: [uml-user] Cannot bringup DHCP (2.6.39 kernel + Debian 5.0 rootfs)
> 
> (snip)
> 
> >>> Having been struggling this for 1 week, any help appreciated !
> >> Have you tried following these instructions:
> >> http://uml.devloop.org.uk/howto.html
> > Question here, if uml is running in my desktop, i need to install and run dhcpd in my desktop ?
> If you are following the howto yes. The UML VM must be a on different
> subnet, routed by the host.
> 
> >sorry i'm kind of lost, this is in a company, the company has the dhcp server running for all the PCs.
> If you want to re-use the main dhcp server, you have two options left
> (as per Jeff's email):
> * a dhcp forwarder
> * bridging
> 
> Antoine
> 
> 
> >>
> >> Cheers
> >> Antoine
> > Thanks again !
> >>
> >>>
> >>>  		 	   		  
> >>>
> >>>
> >>>
> >>> ------------------------------------------------------------------------------
> >>> All the data continuously generated in your IT infrastructure 
> >>> contains a definitive record of customers, application performance, 
> >>> security threats, fraudulent activity, and more. Splunk takes this 
> >>> data and makes sense of it. IT sense. And common sense.
> >>> http://p.sf.net/sfu/splunk-novd2d
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> User-mode-linux-user mailing list
> >>> Use...@li...
> >>> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
> >>
> >>
> >> ------------------------------------------------------------------------------
> >> All the data continuously generated in your IT infrastructure 
> >> contains a definitive record of customers, application performance, 
> >> security threats, fraudulent activity, and more. Splunk takes this 
> >> data and makes sense of it. IT sense. And common sense.
> >> http://p.sf.net/sfu/splunk-novd2d
> >> _______________________________________________
> >> User-mode-linux-user mailing list
> >> Use...@li...
> >> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
> >  		 	   		  
> 
 		 	   		  

Re: [uml-user] Cannot bringup DHCP (2.6.39 kernel + Debian 5.0 rootfs)

[ning ji <ni...@ho...>]

Jeff,
i think you are right, but our team roll out the possibility of setting up another DHCP server.
After spent hours on the dhcrelay3 and bcrelay, i gave up.(I followed http://r3dux.org/2009/09/how-to-make-virtualbox-use-your-routers-dhcp-to-get-an-ip-address-in-linux/as i cannot find good docs on DHCP for uml using dhcrelay etc.)
Linux has a huge problem on clear & good instructions for normal users.I have been coding for 15 years and i cannot make DHCP to work for 1+ week.
Checking around, many senior linux friends never touched UML.
I'm using static ip for uml now to catch up with the schedule.Would appreciate if you have good step-by-step instructions.
Thanks very much !

> Date: Wed, 30 Nov 2011 20:42:29 -0500
> From: jd...@ad...
> To: ni...@ho...
> CC: an...@na...; use...@li...
> Subject: Re: [uml-user] Cannot bringup DHCP (2.6.39 kernel + Debian 5.0 rootfs)
> 
> The thing about DHCP is that the protocol is confined to an ethernet
> broadcast domain, and a TUN/TAP connection to the host is a separate
> broadcast domain from the LAN.  It's a private ethernet with two hosts
> on it.
> 
> DHCP will work if one of the following is true:
> 	The DHCP server is the UML host and dhcpd is listening on the
> TAP device
> 	a DHCP forwarder, like dhcrelay, is running on the host
> 	UML is bridged to the host's eth
> 
> The bridging option puts the UML on the LAN on a par with any physical
> system on the ethernet.
> 
> 			Jeff
 		 	   		  

Re: [uml-user] Cannot bringup DHCP (2.6.39 kernel + Debian 5.0 rootfs)

[Antoine M. <an...@na...>]

(snip)

>>> Having been struggling this for 1 week, any help appreciated !
>> Have you tried following these instructions:
>> http://uml.devloop.org.uk/howto.html
> Question here, if uml is running in my desktop, i need to install and run dhcpd in my desktop ?
If you are following the howto yes. The UML VM must be a on different
subnet, routed by the host.

>sorry i'm kind of lost, this is in a company, the company has the dhcp server running for all the PCs.
If you want to re-use the main dhcp server, you have two options left
(as per Jeff's email):
* a dhcp forwarder
* bridging

Antoine


>>
>> Cheers
>> Antoine
> Thanks again !
>>
>>>
>>>  		 	   		  
>>>
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> All the data continuously generated in your IT infrastructure 
>>> contains a definitive record of customers, application performance, 
>>> security threats, fraudulent activity, and more. Splunk takes this 
>>> data and makes sense of it. IT sense. And common sense.
>>> http://p.sf.net/sfu/splunk-novd2d
>>>
>>>
>>>
>>> _______________________________________________
>>> User-mode-linux-user mailing list
>>> Use...@li...
>>> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
>>
>>
>> ------------------------------------------------------------------------------
>> All the data continuously generated in your IT infrastructure 
>> contains a definitive record of customers, application performance, 
>> security threats, fraudulent activity, and more. Splunk takes this 
>> data and makes sense of it. IT sense. And common sense.
>> http://p.sf.net/sfu/splunk-novd2d
>> _______________________________________________
>> User-mode-linux-user mailing list
>> Use...@li...
>> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
>  		 	   		  

Re: [uml-user] Cannot bringup DHCP (2.6.39 kernel + Debian 5.0 rootfs)

[Jeff D. <jd...@ad...>]

The thing about DHCP is that the protocol is confined to an ethernet
broadcast domain, and a TUN/TAP connection to the host is a separate
broadcast domain from the LAN.  It's a private ethernet with two hosts
on it.

DHCP will work if one of the following is true:
	The DHCP server is the UML host and dhcpd is listening on the
TAP device
	a DHCP forwarder, like dhcrelay, is running on the host
	UML is bridged to the host's eth

The bridging option puts the UML on the LAN on a par with any physical
system on the ethernet.

			Jeff

Re: [uml-user] Cannot bringup DHCP (2.6.39 kernel + Debian 5.0 rootfs)

[ning ji <ni...@ho...>]

> Date: Thu, 1 Dec 2011 01:50:08 +0700
> From: an...@na...
> To: use...@li...
> Subject: Re: [uml-user] Cannot bringup DHCP (2.6.39 kernel + Debian 5.0	rootfs)
> 
> On 11/30/2011 02:54 AM, ning ji wrote:
> > 
> > Hi everyone,
> > I'm new to UML, having issues bring up DHCP for my uml.
> > step 1:./kernel2.6.39  ubda=./debian50.rfs  mem=128M  eth0=tuntap,,,10.50.183.254
> Have you tried using a specific tap device here? Like:
> (...) eth0=tuntap,tap1,fe:f0:00:00:00:01,10.50.183.254
try that, not working either.
> 
> > so as you see,kernel: Linux (none) 2.6.39.4 #2 Thu Sep 1 11:25:36 EDT 2011 i686 GNU/Linuxrootfs: Debian-5.0-x86-root_fs
> > step 2:After it boots,(none):/etc/init.d# /etc/init.d/networking restart
> > Configuring network interfaces...Internet Systems Consortium DHCP Client V3.1.1Copyright 2004-2008 Internet Systems Consortium.All rights reserved.For info, please visit http://www.isc.org/sw/dhcp/
> > [    3.660000] helper_wait : waitpid process 13629 failed, errno = 10[    3.660000] * modprobe tun[    3.660000] * ifconfig tap0 10.50.183.254 netmask 255.255.255.255 up[    3.660000] * bash -c echo 1 > /proc/sys/net/ipv4/ip_forwardListening on LPF/eth0/ba:b4:8c:0a:56:95Sending on   LPF/eth0/ba:b4:8c:0a:56:95Sending on   Socket/fallbackDHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
> I find it impossible to read you emails as the formatting is just terrible.
sorry, hotmail always gives me trouble. Try again.1. reboot2. at the prompt, type "ifup eth0 -v"

debianuml:~# ifup eth0 -v
Configuring interface eth0=eth0 (inet)
run-parts --verbose /etc/network/if-pre-up.d

dhclient3 -pf /var/run/dhclient.eth0.pid -lf /var/lib/dhcp3/dhclient.eth0.leases eth0
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/fe:f0:00:00:00:01
Sending on   LPF/eth0/fe:f0:00:00:00:01
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 15
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 14
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 14
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
run-parts --verbose /etc/network/if-up.d
run-parts: executing /etc/network/if-up.d/mountnfs
debianuml:~#







> 
> > step 3:On the other hand, if i type these 2 commands,ifconfig eth0 10.50.181.135 netmask 255.255.252.0 up
> > route add default gw 10.50.183.254 eth0
> > static ip will be up for eht0, i can do ping etc.
> You aren't posting all the commands that you ran, like (re)starting the
> dhcp daemon, etc.
ifup eth0 -vwhich becomesdhclient3 -pf /var/run/dhclient.eth0.pid -lf /var/lib/dhcp3/dhclient.eth0.leases eth0

> 
> > step 4:Note for the /etc/dhcp3/dhclient.conf, i didn't change anything from the original debian_5.0 rootfs.As i compared with the one from my ubuntu desktop, they look almost the same. Certainly my ubuntu works.(I'm using debian rootfs as none of the ubuntu rootfs i downloaded works.)
> Since you are referring to the Ubuntu filesystems that I made (from a
> separate email), let me correct this statement slightly: these
> filesystems work just fine, but not with UML, as stated on their
> individual download page (IIRC Lucid is the last Ubuntu release that
> booted ok with UML)
> 
> > Having been struggling this for 1 week, any help appreciated !
> Have you tried following these instructions:
> http://uml.devloop.org.uk/howto.html
Question here, if uml is running in my desktop, i need to install and run dhcpd in my desktop ?sorry i'm kind of lost, this is in a company, the company has the dhcp server running for all the PCs.
> 
> Cheers
> Antoine
Thanks again !
> 
> > 
> >  		 	   		  
> > 
> > 
> > 
> > ------------------------------------------------------------------------------
> > All the data continuously generated in your IT infrastructure 
> > contains a definitive record of customers, application performance, 
> > security threats, fraudulent activity, and more. Splunk takes this 
> > data and makes sense of it. IT sense. And common sense.
> > http://p.sf.net/sfu/splunk-novd2d
> > 
> > 
> > 
> > _______________________________________________
> > User-mode-linux-user mailing list
> > Use...@li...
> > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
> 
> 
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure 
> contains a definitive record of customers, application performance, 
> security threats, fraudulent activity, and more. Splunk takes this 
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> _______________________________________________
> User-mode-linux-user mailing list
> Use...@li...
> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
 		 	   		  

Re: [uml-user] Cannot bringup DHCP (2.6.39 kernel + Debian 5.0 rootfs)

[Antoine M. <an...@na...>]

On 11/30/2011 02:54 AM, ning ji wrote:
> 
> Hi everyone,
> I'm new to UML, having issues bring up DHCP for my uml.
> step 1:./kernel2.6.39  ubda=./debian50.rfs  mem=128M  eth0=tuntap,,,10.50.183.254
Have you tried using a specific tap device here? Like:
(...) eth0=tuntap,tap1,fe:f0:00:00:00:01,10.50.183.254

> so as you see,kernel: Linux (none) 2.6.39.4 #2 Thu Sep 1 11:25:36 EDT 2011 i686 GNU/Linuxrootfs: Debian-5.0-x86-root_fs
> step 2:After it boots,(none):/etc/init.d# /etc/init.d/networking restart
> Configuring network interfaces...Internet Systems Consortium DHCP Client V3.1.1Copyright 2004-2008 Internet Systems Consortium.All rights reserved.For info, please visit http://www.isc.org/sw/dhcp/
> [    3.660000] helper_wait : waitpid process 13629 failed, errno = 10[    3.660000] * modprobe tun[    3.660000] * ifconfig tap0 10.50.183.254 netmask 255.255.255.255 up[    3.660000] * bash -c echo 1 > /proc/sys/net/ipv4/ip_forwardListening on LPF/eth0/ba:b4:8c:0a:56:95Sending on   LPF/eth0/ba:b4:8c:0a:56:95Sending on   Socket/fallbackDHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
I find it impossible to read you emails as the formatting is just terrible.

> step 3:On the other hand, if i type these 2 commands,ifconfig eth0 10.50.181.135 netmask 255.255.252.0 up
> route add default gw 10.50.183.254 eth0
> static ip will be up for eht0, i can do ping etc.
You aren't posting all the commands that you ran, like (re)starting the
dhcp daemon, etc.

> step 4:Note for the /etc/dhcp3/dhclient.conf, i didn't change anything from the original debian_5.0 rootfs.As i compared with the one from my ubuntu desktop, they look almost the same. Certainly my ubuntu works.(I'm using debian rootfs as none of the ubuntu rootfs i downloaded works.)
Since you are referring to the Ubuntu filesystems that I made (from a
separate email), let me correct this statement slightly: these
filesystems work just fine, but not with UML, as stated on their
individual download page (IIRC Lucid is the last Ubuntu release that
booted ok with UML)

> Having been struggling this for 1 week, any help appreciated !
Have you tried following these instructions:
http://uml.devloop.org.uk/howto.html

Cheers
Antoine

> 
>  		 	   		  
> 
> 
> 
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure 
> contains a definitive record of customers, application performance, 
> security threats, fraudulent activity, and more. Splunk takes this 
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> 
> 
> 
> _______________________________________________
> User-mode-linux-user mailing list
> Use...@li...
> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user

Re: [uml-user] build a own image

[Antoine M. <an...@na...>]

On 11/30/2011 08:25 PM, mattias wrote:
> how to do it?
> without bebootstrap
I assume you mean debootstrap? And why would you want to avoid it?
You aren't saying which distro or version you are trying to create which
makes it difficult to give you any advice.

For Fedora and Debian/Ubuntu distros you can use febootstrap:
http://people.redhat.com/~rjones/febootstrap/

Otherwise the images that I provide all include the scripts that were
used to create them on their own info page. These are ugly and very
hackish, but they work (and they do use debootsrap where possible):
http://fs.devloop.org.uk/

Cheers
Antoine




> 
> 
> 
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure 
> contains a definitive record of customers, application performance, 
> security threats, fraudulent activity, and more. Splunk takes this 
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> 
> 
> 
> _______________________________________________
> User-mode-linux-user mailing list
> Use...@li...
> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user

Re: [uml-user] swapoff killed by OOM despite there is enough RAM available

[richard -r. w. <ric...@gm...>]

On Wed, Nov 30, 2011 at 3:12 PM, Dmitry Panov <dmi...@ya...> wrote:
> On 30/11/2011 14:00, richard -rw- weinberger wrote:
>>
>> On Tue, Nov 29, 2011 at 6:39 PM, Dmitry Panov<dmi...@ya...>
>>  wrote:
>>>
>>> Hi guys,
>>>
>>> I'm having an issue with swapoff which gets killed by OOM. I was able to
>>> reproduce it with UML guests running different kernel versions, starting
>>> from 2.6.26 to  3.1.3. The only difference is with latest kernels
>>> sometimes
>>> it crashes instead of being killed. I haven't seen it on 'native' kernels
>>> so
>>> I guess it's UML specific.
>
>
>>>
>>> Can anybody reproduce this?
>>>
>> Yes (sort of).
>> OOM does not happen but swapoff() seems to run forever.
>> It's looks like the kernel is unable to unuse swapped pages.
>>
> With later kernels I had the same effect, swapoff running forever. Earlier
> versions get it killed by OOM which is actually better as it at least allows
> the machine to shutdown.
>
> Any ideas what could be the problem?
>

I have to talk to some mm hackers.
I'm not sure how this issue is related to UML.

Maybe UML triggers a mm-bug.
Or (most likely) mm triggers a bug in UML.

-- 
Thanks,
//richard

Re: [uml-user] swapoff killed by OOM despite there is enough RAM available

[Dmitry P. <dmi...@ya...>]

On 30/11/2011 14:00, richard -rw- weinberger wrote:
> On Tue, Nov 29, 2011 at 6:39 PM, Dmitry Panov<dmi...@ya...>  wrote:
>> Hi guys,
>>
>> I'm having an issue with swapoff which gets killed by OOM. I was able to
>> reproduce it with UML guests running different kernel versions, starting
>> from 2.6.26 to  3.1.3. The only difference is with latest kernels sometimes
>> it crashes instead of being killed. I haven't seen it on 'native' kernels so
>> I guess it's UML specific.

>>
>> Can anybody reproduce this?
>>
> Yes (sort of).
> OOM does not happen but swapoff() seems to run forever.
> It's looks like the kernel is unable to unuse swapped pages.
>
With later kernels I had the same effect, swapoff running forever. 
Earlier versions get it killed by OOM which is actually better as it at 
least allows the machine to shutdown.

Any ideas what could be the problem?

-- 
Dmitry Panov

Re: [uml-user] swapoff killed by OOM despite there is enough RAM available

[richard -r. w. <ric...@gm...>]

On Tue, Nov 29, 2011 at 6:39 PM, Dmitry Panov <dmi...@ya...> wrote:
> Hi guys,
>
> I'm having an issue with swapoff which gets killed by OOM. I was able to
> reproduce it with UML guests running different kernel versions, starting
> from 2.6.26 to  3.1.3. The only difference is with latest kernels sometimes
> it crashes instead of being killed. I haven't seen it on 'native' kernels so
> I guess it's UML specific.
>
> Richard, I know I mentioned on the IRC yesterday that it was fine with
> 2.6.37, but I was wrong.
>
> Basically this is the command line to start UML:
>
> /usr/local/sbin/linux32.uml mem=160m elevator=noop
> ubda=/home/uml/machines/static-fe02/root_cow.img,/opt/uml/shared/ia32_squeeze/images/root01.img
> ubdb=swap.img root=/dev/ubda con0=fd:0,fd:1 con=pty
> eth0=daemon,de:00:00:00:00:08,unix,/var/run/uml-utilities/uml_switch.ctl
> umid=static-fe02 uml_dir=/root/.uml hostfs=/var/uml
>
> swap.img is a solid file, 360M in size. Then inside the VM I ran the
> following perl script:
>
> #!/usr/bin/perl
>
> my @a;
>
> print "Filling...\n";
> my $i = 0;
> while ($i < 20000000) {
>    push @a, 1;
>    $i++;
> }
> print "Done.\n";
>
>
> There is nothing magical about this script, it just makes sure some swap is
> being used after it finishes.
>
> static-fe02:~# free
>             total       used       free     shared    buffers     cached
> Mem:        158468       8524     149944          0        136       4016
> -/+ buffers/cache:       4372     154096
> Swap:       327672       2344     325328
>
> There should be enough RAM to clear the swap, right? However if I run
> swapoff -a, I get this:
>
> swapoff invoked oom-killer: gfp_mask=0x1200d2, order=0, oomkilladj=0
> 1294cd74:  [<081ea1a9>] dump_stack+0x1c/0x20
> 1294cd8c:  [<08095712>] oom_kill_process+0x4b/0x166
> 1294cdb8:  [<08095bcb>] out_of_memory+0x151/0x17e
> 1294cdf0:  [<08097abf>] __alloc_pages_internal+0x299/0x33f
> 1294ce48:  [<08097b8e>] __alloc_pages+0x13/0x15
> 1294ce54:  [<080a506a>] read_swap_cache_async+0x40/0xab
> 1294ce7c:  [<080a6583>] sys_swapoff+0x1ea/0x774
> 1294cf28:  [<0805b017>] handle_syscall+0x7b/0x98
> 1294cf78:  [<08068f72>] userspace+0x2cd/0x374
> 1294cfe0:  [<08058d2b>] fork_handler+0x53/0x5b
> 1294cffc:  [<00000000>] 0x0
>
> Mem-info:
> Normal per-cpu:
> CPU    0: hi:   42, btch:   7 usd:  35
> Active:200 inactive:1 dirty:0 writeback:0 unstable:0
>  free:456 slab:38427 mapped:0 pagetables:49 bounce:0
> Normal free:1824kB min:1680kB low:2100kB high:2520kB active:800kB
> inactive:4kB present:177112kB pages_scanned:422 all_unreclaimable? no
> lowmem_reserve[]: 0 0
> Normal: 42*4kB 1*8kB 1*16kB 1*32kB 1*64kB 0*128kB 0*256kB 1*512kB 1*1024kB
> 0*2048kB 0*4096kB = 1824kB
> 22 total pagecache pages
> Swap cache: add 802082, delete 802082, find 30288/37816
> Free swap  = 4294965488kB
> Total swap = 0kB
> Free swap:        -1808kB
> 44627 pages of RAM
> 0 pages of HIGHMEM
> 5010 reserved pages
> 20 pages shared
> 0 pages swap cached
> Out of memory: kill process 646 (swapoff) score -1 or a child
> Killed process 646 (swapoff)
>
> Can anybody reproduce this?
>

Yes (sort of).
OOM does not happen but swapoff() seems to run forever.
It's looks like the kernel is unable to unuse swapped pages.

-- 
Thanks,
//richard

[uml-user] build a own image

[mattias <mj...@mj...>]

how to do it?
without bebootstrap

Re: [uml-user] stop a vm

[Riccardo M. <ric...@gm...>]

On Wed, Nov 30, 2011 at 00:20, mattias <mj...@mj...> wrote:
> are it possible from the host?

Have a look at the `uml_mconsole` command.

If you pass the `umid=somestring` option to the UML, then you can kill it with:

    uml_mconsole somestring halt

(Unless the UML is stuck hard, in which case you have to resort to
"kill"-ing the processes.)

Best regards,
Riccardo

Re: [uml-user] stop a vm

[Chris F. <cd...@fo...>]

On Wed, Nov 30, 2011 at 12:20:24AM +0100, mattias wrote:
> are it possible from the host?

It's not ideal, but I use a script like this:

#!/bin/bash

for pid in  $(ps aux |grep uml |awk '{print $2}') ; do
        echo "Killing $pid..."
        kill -9 $pid
done


This assumes that only one UML VM is running.

I'm assuming there is a better way, but I don't know it.

- Chris

[uml-user] stop a vm

[mattias <mj...@mj...>]

are it possible from the host?

[uml-user] Cannot bringup DHCP (2.6.39 kernel + Debian 5.0 rootfs)

[ning ji <ni...@ho...>]

Hi everyone,
I'm new to UML, having issues bring up DHCP for my uml.
step 1:./kernel2.6.39  ubda=./debian50.rfs  mem=128M  eth0=tuntap,,,10.50.183.254
so as you see,kernel: Linux (none) 2.6.39.4 #2 Thu Sep 1 11:25:36 EDT 2011 i686 GNU/Linuxrootfs: Debian-5.0-x86-root_fs
step 2:After it boots,(none):/etc/init.d# /etc/init.d/networking restart
Configuring network interfaces...Internet Systems Consortium DHCP Client V3.1.1Copyright 2004-2008 Internet Systems Consortium.All rights reserved.For info, please visit http://www.isc.org/sw/dhcp/
[    3.660000] helper_wait : waitpid process 13629 failed, errno = 10[    3.660000] * modprobe tun[    3.660000] * ifconfig tap0 10.50.183.254 netmask 255.255.255.255 up[    3.660000] * bash -c echo 1 > /proc/sys/net/ipv4/ip_forwardListening on LPF/eth0/ba:b4:8c:0a:56:95Sending on   LPF/eth0/ba:b4:8c:0a:56:95Sending on   Socket/fallbackDHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8

step 3:On the other hand, if i type these 2 commands,ifconfig eth0 10.50.181.135 netmask 255.255.252.0 up
route add default gw 10.50.183.254 eth0
static ip will be up for eht0, i can do ping etc.

step 4:Note for the /etc/dhcp3/dhclient.conf, i didn't change anything from the original debian_5.0 rootfs.As i compared with the one from my ubuntu desktop, they look almost the same. Certainly my ubuntu works.(I'm using debian rootfs as none of the ubuntu rootfs i downloaded works.)
Having been struggling this for 1 week, any help appreciated !