TheGrebs.com:IRC Logs:#uml:2006:08:10

---	Log	opened Thu Aug 10 00:00:15 2006
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01:52	<fo0bar>	odd, the nagafix kernels contain ipv6 guest tun support, but not ipv4
01:52	[~]	fo0bar continues to use caker's kernel configs
01:52	<fo0bar>	(yes, I could just maintain my own configs, but I'm lazy)
01:55	<fo0bar>	caker: btw, CONFIG_CIFS could be useful, as you already have CONFIG_SMB_FS enabled
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09:59	<jdike>	Hi guys
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10:05	<Ancalagon>	hi
10:07	<dgraves>	yo!
10:08	<Ancalagon>	bye!
10:09	<dgraves>	yeesh
10:09	<dgraves>	i always miss the party.
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11:57	<andersje>	question: can I set the uml_switch application to be setuid so that any user can access the net through it?
11:57	<andersje>	or should I just set it to be setgid, and put everyone in that group?
11:58	<andersje>	where everyone is defined as "all users with UMLs who can get out to the internet"
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12:01	<jdike>	the better approach is probably to chmod the switch's control socket
12:01	<jdike>	and/or chown/chgrp it
12:02	<andersje>	danke
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12:14	<andersje>	are the -tap and -unix flags to uml_switch mutually exclusive? Or would I want to run them together?
12:20	<andersje>	nevermind
12:20	<andersje>	turns out I need to stop messing with the defaults
12:25	<andersje>	if the uml_switch socket is mode 777, why would one of my virtual machines get a SIOCSIFFLAGS: Permission denied
12:25	<andersje>	error when I try to bring the interface up?
12:26	<andersje>	I do not get this error if I run the UML machine as the user that is running the uml_switch
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13:01	<jdike>	what does dmesg say?
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13:06	<andersje>	dmesg has lots of [42949397.610000] line_ioctl: tty0: ioctl TIOCLINUX called
13:10	<jdike>	anything related to bringing the interface up
13:10	<andersje>	nothing at all
13:12	<andersje>	is this a sane startup command? Kernel command line: ubda=/home/uml/jda-Mandriva-2006-AMD64-root_fs mem=128M eth0=daemon,08:00:07:26:c0:a6 root=98:0
13:12	[~]	dgraves wonders at the root=, but hey.
13:12	<jdike>	it's OK
13:12	<andersje>	(I want to specify the MAC so it will grab a specific IP addr)
13:13	<dgraves>	sure looks sane. except for the lack of linux. :)
13:13	<andersje>	;) grabbed directly from dmesg, you know
13:18	<andersje>	same issue on my FC5 image, as well
13:20	<andersje>	and, now that I've restored uml-utilities to factory settings, not even the "uml-net" user can successfully bring up the network.
13:22	<andersje>	I'll upgrade uml-utilities to the june release, and see if that makes a difference
13:32	<andersje>	now I have some messages from /var/log/messages, using the new uml_switch: http://www.angelar.com/~jeremy/uml-net.txt
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13:33	<andersje>	I wish _I'd_ thought to register the name pengutronix :)
13:35	<jdike>	what's in dmesg?
13:35	<jdike>	about the network?
13:36	<andersje>	still nothing in dmesg.
13:36	<jdike>	hmm
13:36	<jdike>	is the switch saying anything?
13:36	<andersje>	I've got this gut feeling its some kind of permission problem in the host server
13:37	<andersje>	let me run it outside of daemon mode...hold on
13:39	<andersje>	uml_switch logs this when I start it, then nothing: root@thing:/var/log# /usr/bin/uml_switch -tap tap0 -unix /var/run/uml-utilities/uml_switch.ctl
13:39	<andersje>	New connection
13:39	<andersje>	/usr/bin/uml_switch attached to unix socket '/var/run/uml-utilities/uml_switch.ctl' tap device 'tap0'
13:39	<andersje>	New connection
13:39	<andersje>	and then it waits
13:40	<jdike>	OK, that's good
13:41	<andersje>	should /tmp/uml.ctl be world-writeable?
13:41	<jdike>	writeable by whoever will connect to it, I think
13:41	<andersje>	okay.
13:41	<andersje>	no sooner did I ask the question, than I released that's cruft from a uml I had to kill a while ago
13:42	<andersje>	even if I run the guest kernel as root, I still get the permission denied message
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13:58	<kork>	hey, is it safe to patch a recent 2.6.17.x with the 2.6.16-bs2 patch?
14:01	<andersje>	apparently, the command to actually get working networking up is this: Kernel command line: ubda=/home/uml/jda-Mandriva-2006-AMD64-root_fs mem=128M eth0=daemon,08:00:07:26:c0:a5,unix,/var/run/uml-utilities/uml_switch.ctl
14:03	<andersje>	now I just need to get the host to route the packets
14:04	<dgraves>	try sugar, andersje
14:04	<andersje>	O_o
14:04	<andersje>	kork: I've no idea, sorry
14:05	<kork>	ok =) and how about host patches, are those still necessary? it said something about skas0 in the help for tracing thread support
14:06	<andersje>	it is my understanding that skas3 patches will give you better overall security
14:06	<andersje>	but I have not applied them myself
14:07	<kork>	hmm ok
14:07	<kork>	I'm currently running 2.4.27 guests which definitely require a patched host
14:07	<dgraves>	yeep.
14:08	<andersje>	why 2.4.27 guests?
14:08	<kork>	because I've been too lazy to update and a 2.6 guest didn't work with my command line (ubd0 is now ubda or something, dunno)
14:08	<kork>	UML running in SKAS0 mode
14:08	<kork>	hmm, nice
14:08	<kork>	my host didn't crash :P
14:09	<andersje>	funny story: I finally get these 64-bit machines up, and I install software updates blindly. they're 32-bit. the apps won't run.
14:09	[~]	andersje boots himself in the head
14:10	<dgraves>	:(
14:11	<kork>	hmm looks good, except that I don't get a login prompt
14:12	<jdike>	UML lacks 32-bit compatibility so far
14:13	<jdike>	kork, try connecting to a different console
14:13	<kork>	0:2345:respawn:/sbin/getty 38400 ttys/0
14:13	<kork>	does this have to be changed for a 2.6 guest?
14:13	<andersje>	jdike: do you mean that normally, I could get away with such foolishness (running 32bit apps on an x86_64 kernel)?
14:13	<jdike>	yup
14:13	[~]	andersje boggles
14:14	<jdike>	but UML lacks the code to do that right now
14:14	<andersje>	next up: running 32-bit guest kernels under 64-bit host :)
14:14	<kork>	andersje: this is exactly what I'm doing on my athlon 64
14:14	<kork>	64bit kernel, everything else 32bit
14:14	<jdike>	all 64-bits arches that I know of can run 32-bit apps from the junior arch
14:15	<andersje>	cool.
14:15	<kork>	except for the tvtime binary, which is a statically linked 64bit one because it doesn't work with the 32bit emulation of the 64bit kernel
14:15	<kork>	btw, a 32bit uml is running fine on this 64bit host
14:15	<kork>	INIT: Id "0" respawning too fast: disabled for 5 minutes
14:15	<kork>	INIT: no more processes left in this runlevel
14:15	<kork>	hmm
14:15	<kork>	I've seen this before
14:16	<andersje>	kork: thank you. yeah, that one is in the FAQ, I think
14:16	<kork>	[ ][ ] tty channel support
14:16	<kork>	that might be it(?)
14:17	<jdike>	kork, do a defconfig
14:17	<jdike>	that'll start you with a sane config
14:18	<kork>	jdike: that was my fault, I unchecked it
14:18	<andersje>	is there any advantage to having 64-bit guest kernels/OSes under a 64-bit host?
14:18	<jdike>	also, the ttys/* things need to be changed for 2.6
14:18	<kork>	ooh
14:18	<jdike>	bigger address space
14:19	<andersje>	but if I'm limiting them to 128M of RAM and 2 GB of disk...no real advantage, right?
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14:21	<kork>	Debian GNU/Linux 3.1 uml-vorlage console
14:21	<kork>	uml-vorlage login:
14:21	<kork>	tada :)
14:21	<kork>	quoting http://www.citi.umich.edu/projects/asci/uml/2.6.6uml.html : "The UML mailing list lists about 10,000 different ways of doing this, but this one worked for me."
14:21	<kork>	hehe
14:22	<jdike>	of doing what?
14:22	<jdike>	andersje, probably not
14:22	<kork>	modifying the inittab
14:22	<kork>	0:2345:respawn:/sbin/getty 38400 console linux
14:22	<kork>	this seems to do the trick
14:23	<andersje>	"vorlage" ?
14:23	<andersje>	is that the machine name?
14:23	<kork>	andersje: german for "template"
14:25	<andersje>	ah.
14:25	<andersje>	I prefer "flammenwerfer" myself
14:25	<kork>	:D
14:26	<andersje>	at this point I should probably have named the server schadenfreude, for all the entertainment I'm providing my cow-orkers
14:26	<kork>	schadenfreude reminds me of a dilbert cartoon a few days ago
14:27	<kork>	http://dilbert.com/comics/dilbert/archive/images/dilbert2916120060807.gif
14:29	<jdike>	"flammenwerfer"?
14:29	<andersje>	flamethrower
14:29	<jdike>	ah
14:30	[~]	andersje realizes, once again, just how cool UML is--since he doesn't need to unbork his 64bit+32bit system at all--just shut it down, and recopy the master image.
14:31	<kork>	I second that
14:31	[~]	jdike disappears for a bit
14:32	<kork>	I've been using UML for quite some time to "split" server machines into multiple virtual servers
14:32	<kork>	awesome work
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14:36	<andersje>	yeah, definitely
14:36	<andersje>	well, good thing I'm building 64-bit mirrors for my servers...the 32-bit images are giving bus errors all over the place
14:37	<kork>	that's why I'm using the 64 bit kernel
14:37	<kork>	32 bit kernels f*#k up on this mainboard
14:37	<kork>	clock running way too fast and so on
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14:41	<andersje>	well, with this UML box, I'll be the first state college in MN to offer all the Linux students persistant servers accessible from anywhere.
14:41	<andersje>	:s/I'll/we'll/g
14:46	<andersje>	where is tap0 in the filesystem hierarchy?
14:50	<dgraves>	andersje: you're your own college? wow!
14:52	<andersje>	;)
14:52	<andersje>	frankly, my ego is big enough for TWO colleges!
14:52	<kork>	andersje.edu
14:53	<dgraves>	::LOL::
14:58	<andersje>	kork: are you running uml_switch, then?
15:02	<kork>	andersje: nope, a bridge
15:03	<kork>	eth0=tuntap,ns1,FE:FD:D9:77:37:53
15:03	<kork>	like this
15:11	<jdike>	back
15:12	<andersje>	kork: does that work well, and do the machines then have access to the outside?
15:14	<kork>	andersje: it's working pretty well... no need for routing or anything there because the network interfaces of the umls are kinda connected to a virtual network switch, as is the network interface of the host
15:15	<kork>	I'll put you an example somewhere if you like
15:15	<andersje>	hrm. maybe I should do that...but I am liking the idea of a hidden network, too. Do your UML's have private IPs, while your host has a public IP then?
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15:16	<kork>	nope, they're all using public ips
15:16	<kork>	so the router's arp table will have an entry for every uml
15:16	<andersje>	okay, there's my limitation.
15:16	<andersje>	I'm only allowed 1 public IP. And I have ~80 machines I need to run
15:16	<kork>	eth0=tuntap,ns1,FE:FD:D9:77:37:53 the hex numbers actually give out the ip address of the uml guest
15:17	<kork>	oh, okay
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20:21	<SJr\|nx>	On the mainpage it gives me a kernel and a link to a FC image. Except the FC and the kernel do not match up so I have no modules
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21:35	<linuxman26>	hi. I can't seem to get consoles and serial lines working
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---	Log	closed Fri Aug 11 00:00:04 2006