TheGrebs.com:IRC Logs:#uml:2006:08:15

---	Log	opened Tue Aug 15 00:00:21 2006
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04:14	<sandr8>	hello!
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05:40	<TheJim_gah_iptables>	someone please explain to me the advantage of UML over linux-vserver tech]
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06:35	<javiroman>	i guess that vservers allow virtualized servers sharing one kernel, and UML is one kernel itself, one server per UML instance
06:36	<javiroman>	try http://www.redhat.com/magazine/001nov04/features/usermode/
06:37	<javiroman>	(uff sorry this poor english)
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07:36	<dgraves>	morning!
07:42	<kokoko1>	morning but evening for me :D
07:48	<dgraves>	eh, its all relative.
07:48	<dgraves>	who's relative, i dunno.
07:57	<kokoko1>	Hehe yeah
07:57	<kokoko1>	dgraves, do you have any link for xen vs uml ?
07:58	<kokoko1>	I am wondering whats cool in xen that big parties RH, suse going for it.
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08:43	<dgraves>	kokoko1: xen competes with vmware esx, not uml.
08:43	<dgraves>	its a low level hypervisor that puts a very thin layer under the various clients.
08:52	<kokoko1>	dgraves, I am just wondering for data center ppl and for ppl using virtualization xen is beneficial or UML ?
09:16	<dgraves>	kokoko1: depends what you're doing.
09:16	<dgraves>	i think xen is faster overall.
09:16	<dgraves>	and eventually you can run windows.
09:16	<dgraves>	http://lwn.net/Articles/144765/
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10:02	<jdike>	Hi guys
10:06	<javiroman>	hi
10:06	<kokoko1>	Hello jdike
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14:52	<Rygel43>	Good evening
14:52	<Rygel43>	(Respectively 'hello' for the other time zones ;-) )
14:55	<Rygel43>	I've got a quite stupid problem here: Whilst trying to setup networking with arp proxy and tuntap, I always get a whole bunch of errors like 'SIOCSIFADDR: No such device' etc. - On a physical system I would guess I just forgot to install the eth/NIC modules for the device, but in the uml instance I've got no clue where to look at...
14:55	<Rygel43>	Any ideas? tuntap is active on the host - and /etc/network/interfaces seems alright - I'm out of ideas and quite frustrated sigh
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15:01	<dgraves>	Rygel43: unfortunately, uml networking is not my strong suit.
15:02	<Rygel43>	At least you are awake, responding and trying to help ... I'm not alone! :-)
15:03	<Rygel43>	I guess I'm just too lazy to compile another pair of kernels to give that thing another try. I've setup so many uml machines ... but I've never been so frustrated about a single mistake g
15:05	<jdike>	Rygel43, what are the exact errors?
15:05	<Rygel43>	Hi Jeff, thanks for responding
15:05	<Rygel43>	One moment please
15:07	<Rygel43>	After starting the uml, a simple 'ifconfig' just shows the lo device
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15:07	<Rygel43>	tuntap can be seen in the guest's dmesg
15:08	<Rygel43>	I can't bring up the eth0 device in the UML guest by 'ifup eth0 up' or 'ifconfig ...'
15:08	<Rygel43>	the exact error is
15:08	<Rygel43>	ifup eth0
15:08	<Rygel43>	SIOCSIFADDR: No such device
15:08	<Rygel43>	eth0: ERROR while getting interface flags: No such device
15:08	<Rygel43>	SIOCSIFNETMASK: No such device
15:08	<Rygel43>	SIOCSIFBRDADDR: No such device
15:09	<Rygel43>	eth0: ERROR while getting interface flags: No such device
15:09	<Rygel43>	Failed to bring up eth0.
15:09	<Rygel43>	As mentioned
15:09	<jdike>	what's in dmesg?
15:09	<Rygel43>	sry, As mentioned I would think I forgot the module for the NIC on a physical system, but inside UML I don't get it...
15:10	<jdike>	does ifconfig -a mention eth0?
15:10	<Rygel43>	What do you mean? Any ideas what to look for? I haven't seen anything bad there, yet.
15:10	<jdike>	it would be obvious
15:10	<jdike>	and what's the command line?
15:10	<Rygel43>	dmesg shows the kernel command line with eth0=tuntap,tap112
15:11	<Rygel43>	./linux ubd0=ubuntu_fs ubd1=swap_fs eth0=tuntap,tap112 mem=100M con0=null,fd:3 con1=fd:0,fd:1
15:11	<jdike>	You did configure tap112 on the host?
15:11	<Rygel43>	the dmesg command line shos a 'root=98:0' at its end
15:11	<Rygel43>	Yes, Sir.
15:11	<jdike>	what does ifconfig tap112 on the host say?
15:12	<Rygel43>	I've got a tap112 active and running in the ifconfig of the host
15:12	<Rygel43>	Inet Addr: 192.168.2.111 (Host Address)
15:12	<Rygel43>	I chmod'ed /dev/net/tun as usual
15:13	<Rygel43>	The I echoed into /proc/sys/net/ipv4/ip_forward as usual
15:13	<Rygel43>	tunctl -u rygel -t tap112
15:13	<Rygel43>	as a tuntap start
15:13	<Rygel43>	then
15:13	<Rygel43>	ifconfig tap112 192.168.2.111 netmask 255.255.255.255 up
15:14	<Rygel43>	route add -host 192.168.2.112 dev tap112
15:14	<Rygel43>	and another echo:
15:14	<jdike>	okok
15:14	<Rygel43>	echo 1 > /proc/sys/net/ipv4/conf/tap112/proxy_arp
15:14	<jdike>	any of the other stuff being wrong would affect your connectivity
15:14	<Rygel43>	Not trying to flood you, just wannabehelpful(tm)
15:14	<jdike>	not whether the thing works at all
15:14	<Rygel43>	roger
15:15	<Rygel43>	The host got no arp hwaddress in its list if that's important
15:15	<jdike>	what about ifconfig -a showing eth0?
15:15	<Rygel43>	that's still empty
15:15	<jdike>	OK, so the thing really isn't there
15:15	<Rygel43>	nope, a few other devices, including eth2
15:15	<jdike>	an eth1?
15:15	<Rygel43>	nope
15:15	<jdike>	you didn't ask for an eth2
15:15	<Rygel43>	I know, that's strange
15:16	<jdike>	well, try bringing up eth2
15:16	<Rygel43>	eth2 is not up nor defined, but visible in ifconfig-a
15:16	<jdike>	I saw one other case of that
15:16	<Rygel43>	Ignoring unknown interface eth2=eth2
15:16	<jdike>	someone asked for eth0 on the command line, but got eth1
15:16	<Rygel43>	That dumb thing dislikes me...
15:16	<jdike>	dmesg \| grep eth
15:17	<Rygel43>	one moment
15:17	<Rygel43>	eth2 got up after I corrected my typo blush
15:18	<Rygel43>	I can ping the host now!
15:18	<Rygel43>	beingimpressed
15:18	<jdike>	yeah, that's your eth0
15:18	<jdike>	I need to figure out how it's fscking up the naming
15:18	<Rygel43>	And the outside world. 'All my circuits are functioning...'
15:18	<Rygel43>	s/s/u ? g
15:19	<Rygel43>	Strange thing...
15:19	<jdike>	this is a polite channel
15:19	<Rygel43>	It ist :-)
15:19	<Rygel43>	-t (german flag whilst typing fast...)
15:19	<jdike>	what about dmesg \| grep eth?
15:19	<Rygel43>	mompls
15:20	<Rygel43>	Only the command line - and now at last an 'eth2: no IPv6 routers present' line
15:20	<Rygel43>	But nothing 'regular' about eth0 or something
15:20	<jdike>	Oh
15:21	<jdike>	grep -i for netdevice instead
15:21	<Rygel43>	Sorry, what do you mean?
15:21	<Rygel43>	case insensitive search into dmesg about eth0?
15:22	<Rygel43>	ah, sorry...
15:22	<Rygel43>	dmesg \| grep -i netdevice
15:22	<Rygel43>	Netdevice 0 : TUN/TAP backend -
15:22	<Rygel43>	That's all
15:24	<jdike>	OK, that's talking about eth0
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15:24	<Rygel43>	Ah, '0' for eth0?
15:24	<jdike>	yeah
15:24	<Rygel43>	Any ideas what the other guy and me could have in common?
15:25	<Rygel43>	In common as in 'causing strange eth0 assignments'?
15:25	<jdike>	there's actually no guarantee that that number will line up with the eth number
15:25	<Rygel43>	Ah, I see
15:25	<Rygel43>	Haven't seen that before
15:25	<jdike>	but it certainly shouldn't skip eth0 and eth1 and give you eth2
15:25	<jdike>	the known bug is if you say eth1=.. eth0=.., you'll get them backwards
15:25	<Rygel43>	I rebooted host and guest several times, but no change, the eth2 seems to be written in stone...
15:26	<Rygel43>	ah, I see
15:26	<Rygel43>	Just one single interface here
15:26	<Rygel43>	Has the other guy used ubuntu or something different? I've got no other file system here to try, but I'm willing :)
15:26	<jdike>	dunno
15:29	<Rygel43>	Okay, I'll try another distro and I'll play with the other command line parameters. If I see any scheme behind this weird behaviour, I'll let you know. In case: should I write to the ML or to anyone personally?
15:30	<jdike>	To the mailing list
15:31	<Rygel43>	Okay, I'll do so if I find something that changes the eth2 assignment. Many (!) thanks for your time, Jeff!
15:31	<jdike>	np
15:32	<Rygel43>	:-)
15:36	<Rygel43>	Jeff, one thing: The host does have two NICs, eth0 and eth1, could this be just a coincidence that the guest dislikes eth0 and eth1?
15:40	<jdike>	no
15:41	<jdike>	well, yes
15:41	<jdike>	it is a coincidence
15:41	<jdike>	if it's not a coincidence, I will go insane
15:41	<jdike>	and we couldn't have that
15:44	<Rygel43>	LOL
15:45	<Rygel43>	Don't go insane, Jeff. You've got no reason - you're doing a great job!
15:47	<jdike>	heh, tx
16:04	<Rygel43>	Jeff: I compiled another guest kernel. As the kernel with the eth increment as a monolithic kernel but without being 'static' for a chroot - this one does _not_ show this phenomenon... I'll verify this with the sources of the 'problematic' kernel being configured for non-static uses
16:05	<Rygel43>	Ah, no - same error again, delete my last block please
16:05	<Rygel43>	<- stupid and tired, I'll go to bed now and give it another try tomorrow...
16:06	<Rygel43>	Have a good time
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---	Log	closed Wed Aug 16 00:00:07 2006