TheGrebs.com:IRC Logs:#xen:2006:01:27

---	Log	opened Fri Jan 27 00:00:23 2006
00:10	<johnny43>	yes - xen2 cannot use more than 4gb, and my machine has 8
00:11	<johnny43>	4gb of ram, that is
00:18	<johnny43>	is there a receipe / howto xenify a kernel?
00:20	<johnny43>	i could use that also for xen2, to compile a kernel different than 2.4.30
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01:23	<m0dY>	so why don't u use the xen 2.6 stock kernel ?
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02:14	<Shaun>	anybody alive?
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02:59	<m0dY>	any idea why am i getting this while booting a centos 4.2 domU on my 64bit machine using an 64bit domU kernel... http://pastebin.com/525323
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10:39	<^chewie>	The Xen user manual refers specifically to the Linux 2.6.12 kernel. Can you build a custom kernel w/Linux 2.6.15.x?
10:40	<^chewie>	Xen v3.0 that is
10:47	<^chewie>	no one alive here?
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11:16	<ivan>	^chewie: nope, i dont think so
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11:23	<^chewie>	thx, ivan. I've been browsing gmane
11:23	<^chewie>	looks like some people have gotten dom0 and domU to work w/2.6.15 kernels
11:23	<^chewie>	slight change in how you choose an arch
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14:21	<m0dY>	any body here have centos 4 x86_64 domU image ?!!!
14:27	<m0dY>	:/
14:28	<m0dY>	ok, any to install an x86_64 centos installation from debian to be used as a domU !?
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14:54	<Cyis>	I haven't tried the x86_64 build of xen3 yet... my xen servers are still 2.0.7 runnin on PIII
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16:46	<Shaun2>	whats the best way to give a unpriv user access to console? i assume i can set xm to suid but that seams a bit dangerous IMO, was wondering if their was other ways...
16:50	<karsten>	Shaun2: sudo, IMO.
16:51	<karsten>	Shaun2: ... or you can have the user just SSH into the guest, which would be the preferred mode IMO.
16:51	<karsten>	Shaun2: console's relatively limited. If you need to provide access for debug support, sure, otherwise, don't.
16:52	<murble>	Shaun2: i give people shell access to their VMs with keyed ssh that directly lanches an xencons.
16:52	<murble>	s/shell/virtual console/
16:52	<murble>	I've started writting a menu shell to give people more control.
16:52	<karsten>	murble: Right. Forced commands, right?
16:52	<murble>	karsten: yep.
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17:06	<aliguori>	Shaun, the consoles are exposed on ptys.. you chown the ptys..
17:06	<aliguori>	it would take some hacking...
17:08	<Cyis>	afternoon aliguori
17:10	<aliguori>	Cyis, howdy
17:10	[~]	Cyis scratches his chin...
17:11	<Cyis>	just checking my mail server stats... seems my reject count is coming down from it's 10-11K per 24 hour day to 4-5K
17:11	<aliguori>	woah
17:11	[~]	aliguori hopes mine isn't that bad
17:12	<aliguori>	i've never checked..
17:12	<Cyis>	right now averaging about 3-4 msgs/min rejection rate on both MX servers
17:12	<cfreak>	how much spam do you get?
17:12	<Cyis>	cfreak: you mean spam that actually makes it to the content filters to be identified as spam?
17:12	<cfreak>	yes
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17:13	<Cyis>	each MX server identifies and discards about 60-70 spam messages a day... the rejects account for DNS blacklists and greylisting which catch most things before the expensive content filtering scans the message
17:13	<Shaun2>	murble: using xencons?
17:14	<Shaun2>	i though xen spawned a open telnet connection for each guest that one could just telnet to if they wanted...
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17:15	<murble>	Shaun2: you probably don't want to use telnet for that.
17:16	<murble>	xen 3 is looking nicer it gives you a pty, i'm wondering if i could trick screen into opening them.
17:17	<johnny43>	hi huys (i'm bugging you again).. is there a way to run a 2.4 domU kernel under xen3?
17:17	<Shaun2>	murble: ya i just noticed that a /dev/pts/ was being created with each guest
17:18	<Shaun2>	murble: only problem is figuring out which goes to which
17:18	<murble>	Shaun2: look at the source of xenconsoled
17:18	<Cyis>	cfreak: the amount of spam identified is roughly about 25% of the mail actually received
17:19	<murble>	Shaun2: it seems you poke things at xenstored then something creates it for you.
17:19	<murble>	then you connect to it.
17:19	<murble>	i'm just looking at what xenconsole does.
17:19	<Shaun2>	murble: though you said you where giving access to unpriv users for console :)
17:20	<murble>	Shaun2: i'm using xen2.
17:20	<Shaun2>	oh
17:21	<aliguori>	xenconsoled creates those ptys.. they change though every time a console is disconnected
17:21	<murble>	aliguori: yep, i see.
17:21	<aliguori>	so setting perms on them would require some hacking
17:22	<aliguori>	it would be an interesting patch though... throw a uid/gid pair in xenstore that xenconsoled should use as the pty slave owner
17:23	<Shaun2>	my problem is i dont understand xen enough to do all this yet, i havnt poked around enough to see what it's doing
17:23	<Shaun2>	also, i've never really used python...
17:23	<Shaun2>	if it was perl or php i'd be set :)
17:23	<aliguori>	the console code is mostly c...
17:23	<Shaun2>	great.
17:23	<Shaun2>	i suck at C too :)
17:25	<Shaun2>	hey here's another quick question, i was reading the doc and it looked like i could change the name of dom0's interface for guests using vifname=
17:26	<Shaun2>	i tryed setting virname=blah and the interface still is named vifD.N
17:26	<aliguori>	yes
17:27	<aliguori>	i think vifname is only used for internal identification
17:27	<aliguori>	so you can say
17:27	<aliguori>	xm network-detach vifname
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17:31	<DV>	aliguori: still travelling next week, but I will try to push libvir-0.0.2 out on Monday morning :_)
17:31	<Shaun2>	aliguori: i see.
17:31	<Shaun2>	i know knew my conversion was going too easy...
17:33	<Shaun2>	i noticed that xen also increments the id, is it ever goign to recycle id's or is it just gong to increment to a bizillion :)
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17:37	<Shaun2>	hey, i just found xenconsole
17:39	<aliguori>	DV: excellent
17:40	<aliguori>	Shaun2, it'll wrap around 0x7FFF i think
17:40	<Shaun2>	aliguori: not sure what that means..
17:40	<aliguori>	~3,300
17:40	<aliguori>	er, ~33,000
17:41	<Shaun2>	that'll probably work for what i'm trying to do
17:42	<Shaun2>	setting that to suid would be safer than setting xm
17:42	<murble>	ok most of client/main.c thrown away :-)
17:42	<aliguori>	doh!
17:42	<murble>	now i have a little tool that gets me apty and chowns it
17:42	<aliguori>	why would you do that?
17:42	<aliguori>	oh
17:42	<aliguori>	murble: you know, there's a considerably easier way to do that, just use xenstore-read
17:42	<murble>	aliguori: much easier than going near xenstore :-)
17:43	<Shaun2>	i need to read-up/learn more about xenstore
17:43	<Shaun2>	sounds like it can be very useful.
17:43	<murble>	aliguori: well know i know what i have to do so probably yes
17:45	<aliguori>	murble, i think it's just: chown user:group $(xenstore-read /vm/${domid}/console/tty)
17:45	<aliguori>	i can't get to my test machine to verify...
17:46	<Shaun2>	aliguori: not sure if i have this rigth but....
17:46	<Shaun2>	[root@localhost client][root@localhost client]# echo $(xenstore-read /vm/21/console/tty)
17:46	<Shaun2>	xenstore-read: couldn't read path /vm/21/console/tty
17:47	<Shaun2>	21 is the id of a running guest
17:47	<aliguori>	er
17:48	<aliguori>	there's two domain paths
17:48	<murble>	hmm i just copied what the other thing did
17:48	<aliguori>	one is indexed by the uuid and one is indexed by the domid
17:48	<murble>	and am using /local/domain/$domainid/console/tty
17:48	<aliguori>	xenconsole uses get_home_path
17:48	<aliguori>	that sounds right
17:49	<Shaun2>	[root@localhost client][root@localhost client]# echo $(xenstore-read /local/domain/21/console/tty)
17:49	<Shaun2>	/dev/pts/1
17:50	<aliguori>	be aware, the pts changes whenever you connect and disconnect
17:51	<Shaun2>	so i just would have to have my console script first do a chown user:group before it consoled.
17:51	<murble>	hmm screen happily connects
17:51	<Shaun2>	how would you attach to the console after that though, using xenconsole?
17:51	<murble>	yaya scrollback!
17:51	<Shaun2>	haha
17:51	<aliguori>	Shaun2, yeah, that should work
17:52	<murble>	aliguori: what do you mean by disconnect?
17:52	<murble>	oh i see i only have one domU running so i'm not seeing that behaviour
17:52	<aliguori>	murble, when you hit C-]
17:52	<murble>	aliguori: or ctrl-a k :-)
17:52	<aliguori>	?
17:52	<murble>	aliguori: screen command to kill window
17:52	<aliguori>	you mean, when using screen
17:53	<aliguori>	bah, if you want scrollback, use the virtual framebuffer :-)
17:53	<aliguori>	i need ctrl-a for emacs :-)
17:53	<Shaun2>	i already have rules for screen to from my UML setup
17:53	<murble>	aliguori: i'm so very used to nested ~. and ctrl-a by now..
17:53	<Shaun2>	rules disable everything but detach
17:54	<murble>	but i think having this in xenstore would be a good idea.
17:54	<murble>	aliguori: how difficult would it be to get console out put to not dom0?
17:55	<aliguori>	murble: i don't understand the question
17:55	<murble>	aliguori: well ok priv'ed xenstore access so i can run virtual consoles for people to ssh to but not in domain0
17:56	<murble>	so xenconsoled running elsewhere.
17:56	<aliguori>	oh
17:56	<aliguori>	that's not possible
17:56	[~]	aliguori scratches his head
17:56	<aliguori>	it's theoritically possible, but it would require changing the console driver
17:58	<murble>	well clearly not worth the effort for what i want.
17:58	<aliguori>	yeah
17:58	<Cyis>	aliguori: catch ya later... detaching this screen console and headin home... prolly be back online in about 3 hours
17:59	<Shaun2>	aliguori: you know who maintains xentop? i tryed emailing the top address in the source but it bounced.
18:02	<aliguori>	Cyis, cya
18:02	<aliguori>	Shaun2, uh, it's not really actively maintained... josh's email shouldn't bounce though
18:02	<aliguori>	josh is in school so he doesn't really have much time
18:03	<aliguori>	if you send a note to xen-devel, someone should respond
18:03	<Shaun2>	ok
18:03	<aliguori>	Shaun2, what were you asking?
18:05	<Shaun2>	well i saw in xentop that their todo list said they wanted to add a -n and -b option
18:05	<aliguori>	oh
18:06	<Shaun2>	i need those :)
18:06	<aliguori>	what were they supposed to do?
18:06	<aliguori>	xentop needs to be rewritten...
18:06	<Shaun2>	-n is like the -n switch on top, it tells top to loop a certian number of times
18:06	<Shaun2>	-b is batch mode
18:06	<Shaun2>	-b i think removes all the colors and stuff.
18:06	<aliguori>	you want to screen scrap
18:06	<Shaun2>	makes it plain text.
18:07	<aliguori>	this is why xentop needs to be rewritten
18:07	<Shaun2>	with UML i used top to crap guest cpu usage
18:07	<Shaun2>	with Xen the only way i can see doing that is by grabbing it out of xentop
18:07	<aliguori>	there are other tools
18:08	<aliguori>	actually
18:08	<Shaun2>	unless xenstore-* will give me the info i need
18:08	<aliguori>	if you use xm list
18:08	<aliguori>	and scrap out the cpu time
18:08	<Shaun2>	aliguori: i need realtime % usage
18:08	<aliguori>	all that xentop does is take the cpu time over an interval (say, 1 second), and divide
18:08	<Shaun2>	i have a script that loops every 5 minute polling usage and storing it.
18:08	<Shaun2>	so i can graph it out
18:09	<aliguori>	i think some shell magic with xm would be your best bet..
18:09	<Shaun2>	aliguori: i tryed to grab jiffies once from /proc to calculate usage, had a hell of a time getting it to divide right.
18:10	<aliguori>	yeah, you want to use what xm list produces..
18:10	<aliguori>	xentop uses the same info
18:10	<aliguori>	it comes directly from the hypervisor
18:10	<aliguori>	it's the only way to get this particular info
18:10	<cfreak>	> That is a negative...as far as my meager mind knows. But if you are
18:10	<cfreak>	> trying to write a program you can use the library libxenstat (in
18:10	<cfreak>	> tools/xenstat/libxenstat). This is the library the xentop uses to get
18:10	<cfreak>	> it's data.
18:10	<aliguori>	cfreak: what is that from?
18:11	<cfreak>	xen mailinglist
18:11	<aliguori>	i know, but what's the context
18:11	<cfreak>	somebody wants the output from xentop to a file
18:11	<aliguori>	libxenstat is not a supported library interface
18:11	<aliguori>	it's not installed
18:11	<aliguori>	and should not be used
18:11	<aliguori>	:-)
18:11	<aliguori>	the same info is available via libxc
18:12	<aliguori>	xc_domain_get_vcpu_context() or something like that
18:12	<Shaun2>	one sec, phone err
18:13	<aliguori>	libxenstat doesn't provide cpu usage percentages either
18:13	<aliguori>	you'd still have to calculate that yourself
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18:19	<johnny43>	anyone knows if it would work to run a xen2 domU agains a xen3 dom0?
18:19	<aliguori>	no
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18:21	<johnny43>	no -- don't know, or you know it won't work?
18:22	<aliguori>	it won't work
18:22	<johnny43>	:(
18:22	<johnny43>	then is there a way to have a 2.4 domU under xen3?
18:22	<aliguori>	nope
18:22	<johnny43>	:( again, but thanks for the answers..
18:23	<aliguori>	np
18:23	<johnny43>	how about a 2.4 xenU agains a 2.6 xen0, both xen2?
18:23	<Shaun2>	aliguori: ok..ok..so...
18:24	<Shaun2>	to calculate cpu usage % i should use xm, or a library
18:24	<aliguori>	xm
18:24	<aliguori>	just screen scrap
18:24	<aliguori>	the cpu time, and keep track of how long (in microseconds), between scraping
18:24	<aliguori>	then divide
18:31	<Shaun2>	oh man, my test bash script of this is going to be ghetto!
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21:32	[~]	aliguori shakes his head
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22:01	<Cyis>	ah... home atlast... and with a new shiny AMD Socket 754 64-bit CPU/mobo
22:03	<aliguori>	:-)
22:03	[~]	aliguori just got a new amd system yesterday too
22:04	<Cyis>	that should be able to replace that AMD-K6 CPU/mobo and run Xen :)
22:04	<Cyis>	not to mention I had to get a 1GB DDR400 DIMM
22:04	<aliguori>	i'm still waiting for my memory...
22:04	<aliguori>	right now i'm stuck with 512mb :-(
22:05	<Cyis>	my workstation has three 512MB
22:05	<aliguori>	:-)
22:05	<Cyis>	I only buy Muskin brand RAM... I've had problems in the past with other various brands but not a problem since I start'd buying strictly by brand
22:05	<aliguori>	one benefit of working at a large company is that I don't have to think about this sort of thing :-)
22:06	<aliguori>	they just send me stuff
22:06	<Cyis>	had the option of getting a 32-bit or 64-bit CPU ... went with the 64-bit as it was only $5 difference ;)
22:06	<aliguori>	hehe
22:06	<Cyis>	this is home network
22:07	<Cyis>	hell office we just make a call, give the specs we want met and get a quote...
22:07	<aliguori>	:-)
22:08	<Cyis>	I loved when I started working there almost 5 years ago... first day was told I had $4K budget to get myself a laptop, desktop and monitor
22:08	<aliguori>	hehe
22:09	<Cyis>	unfortunate in a way as I'm still using all three today
22:09	<Cyis>	blew the whole wad :)
22:09	<aliguori>	hehe
22:09	<Cyis>	hmm... there's something about the smell of a freshly open'd anti-static bag with a brand new mobo :)
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22:10	<Cyis>	hmm... now let's hope the PS has the right connectors.. forgot about the 4-pin 12V lead being needed for newer boards
22:11	<aliguori>	this was the first time i put together a pc in a while... was surprised how much things have changed
22:11	<aliguori>	i had never seen a SATA connector before :-) it was confusing
22:12	<Cyis>	yeah... this has SATA RAID 0/1
22:12	<Cyis>	frak... looks like I'll be picking up a new PS
22:12	<aliguori>	:-/
22:12	<aliguori>	that sucks
22:17	<Cyis>	hmm ... maybe not... might have an old case with a PS that'll work
22:19	<Cyis>	although mobo book doesn't say it has to have both... just says it provides two power connectors
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22:29	<Cyis>	damn... size of this fan maybe I should have gone water cooling system :)
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22:53	<aliguori>	karsten, that system-info script is pretty cool
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---	Log	closed Sat Jan 28 00:00:09 2006