xen May 2006

xen@lists.fedoraproject.org

69 participants
92 discussions

FC5/Xen LVM resize question
by Heinz Deinhart 16 May '06

16 May '06

Hi, im playing around with Xen and FC5. There is one thing i dont get working. When i resize a logical volume in dom0 with lvextend, and this volume is used and mounted in a domU, it seems that the domU does not notice the new size of the partition until rebooted. ext2online does nothing, fdisk reports the old size. Should this work somehow without rebooting the domU, or is this the intended behavior? I think, i could create a volume goup inside of a domU and add space to the domU by adding new block devices and adding their space to the volume group. But is this really a clever way of doing this, or are there any easier ways? Thanks a lot, Heinz -- Heinz Deinhart heinz(a)nix.at

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Best Practice for backing up running Virtual Machines
by Christian Reiter 16 May '06

16 May '06

Hello! I am wondering what's the best way to backup a running xen-domU. I've just tried to simply copy the file of a file-backed domU while it was running. Surprisingly that was succesful, i didn't even get a filesystem error.... But i think that is not a reliable way for production servers. What would you recommend to get reliable disaster recovery backups of file-backed as well as partition-backed (raw partition or lvm volumes) vms? Mit freundlichen Grüßen, /// Kind Regards, Christian Reiter -- Christian Reiter ||| c.reiter(a)gmx.net

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problem to start xend and finding the list of domains running
by Prasad Varma Kalidindi S. S. M 15 May '06

15 May '06

I have installed xen 3.0 following FedoraXenQuickstart. After booting it with xen enabled kernel The machine configuration is Linux localhost.localdomain 2.6.16-1.2111_FC5xen0 #1 SMP Thu May 4 21:51:32 EDT 2006 i686 i686 i386 GNU/Linux Then I tried to check the installation by typing # /usr/sbin/xm list Result is Error: Error connecting to xend: No such file or directory. Is xend running? Then I tried to run xend /etc/rc.d/init.d/xend start It gave nothing. What is the problem ? plz send me some quick fixes. With Regards PRASAD VARMA **************** CAUTION - Disclaimer ***************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system. ***INFOSYS******** End of Disclaimer ********INFOSYS***

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RE: [Fedora-xen] Can not boot vm guest rhel4 with smp kernel on FC5with vt enabled hardware (Intel)
by You, Yongkang 15 May '06

15 May '06

Hi Thomas, EM64T machine can install and run either i386 or EM64T Xen. There should be a bug and the same issue like yours about “VMX hugemem kernel has booting problem on EM64T SMP Xen0”. The possible way is to remaking your VMX SMP kernel without hugemem supporting. :-( I heard FC5 SMP VMX can works well on EM64T Xen0, but I didn’t try with it. Frankly saying, SMP VMX is still not too stable now, it is under-tuning. Thanks for the trying and reporting! Best Regards, Yongkang (Kangkang) 永康 ________________________________ From: thomas.vonsteiger(a)bluewin.ch [mailto:thomas.vonsteiger@bluewin.ch] Sent: 2006年5月14日 22:36 To: You, Yongkang; fedora-xen(a)redhat.com Subject: AW: [Fedora-xen] Can not boot vm guest rhel4 with smp kernel on FC5with vt enabled hardware (Intel) Hi Yongkang, acpi=1 and apic=1 is not working, it’s the same problem. My Xen0 is IA32 FC5. Hardware is Pentium D 930 with motherboard D955XBK with EM64T. Is this a problem if i run i386 and not x86_64 ? I get the same problem if I try to start Redhat 7.2, single core is running, smp core is not running. regards, Thomas ________________________________ Von: You, Yongkang [mailto:yongkang.you@intel.com] Gesendet: Sonntag, 14. Mai 2006 02:04 An: thomas.vonsteiger(a)bluewin.ch; fedora-xen(a)redhat.com Betreff: RE: [Fedora-xen] Can not boot vm guest rhel4 with smp kernel on FC5with vt enabled hardware (Intel) Hi Thomas, Did your Xen0 is EM64T (IA32E)? Could you try with opening acpi=1 and apic=1 in the HVM config file. Best Regards, Yongkang (Kangkang) 永康 ________________________________ From: fedora-xen-bounces(a)redhat.com [mailto:fedora-xen-bounces@redhat.com] On Behalf Of thomas.vonsteiger(a)bluewin.ch Sent: 2006年5月13日 14:57 To: fedora-xen(a)redhat.com Subject: [Fedora-xen] Can not boot vm guest rhel4 with smp kernel on FC5with vt enabled hardware (Intel) Hi, I have running rhel4 vm guest on fc5 on VT hardware. Becose i can boot only with single core kernel 2.6.9-34.EL If I try to boot kernel-smp 2.6.9-34.EL with vcpus 2, boot is hanging by.. “Uncompressing Linux … Ok, booting the kernel.” There is no errors, no output on serial console. Anyone see the same effect ? I using this config: # Automatically generated xen config file name = "rhel4_2" builder = "hvm" memory = "256" acpi = 0 apic = 0 pea = 0 vcpus = 2 disk = [ 'phy:/dev/datavg/xenRHEL4_2,ioemu:hda,w' ] vif = [ 'type=ioemu,bridge=xenbr0,mac=00:16:3e:09:e8:e0' ] on_reboot = 'restart' on_crash = 'restart' kernel = '/usr/lib/xen/boot/hvmloader' device_model = '/usr/lib/xen/bin/qemu-dm' #cdrom = '/archiv/iso/RHEL4-U3-i386-AS-disc1.iso' boot = 'c' sdl = 0 # use SDL for graphics vnc = 1 # use VNC for graphics vncviewer = 0 # spawn vncviewer by default nographic = 0 # don't use graphics serial='pty' # enable serial console regards, thomas

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xenguest-install.py issues
by Ashe Canvar 15 May '06

15 May '06

Hi all, I am following the FC5 Xen install page. However my xenU installs do not seem to work using the python script. What am I doing wrong ? [root@medusa1 ~]# NM=m1b; export NM; /usr/sbin/xenguest-install.py -n $NM -f /vmd/$NM/$NM.disk -s 5.1 -r 256 -l nfs:10.1.55.40:/mnt Starting install... Using config file "/etc/xen/m1b". Error: Error creating domain: Kernel image does not exist: /var/lib/xen/vmlinuz.oZFOHc If your install has exited, you can restart your guest by running 'xm create -c m1b'. Otherwise, you can reconnect to the console by running 'xm console m1b' [root@medusa1 ~]# xm create -c m1b Using config file "/etc/xen/m1b". Traceback (most recent call last): File "/usr/bin/pygrub", line 256, in ? cf = get_config(file, isconfig) File "/usr/bin/pygrub", line 139, in get_config raise RuntimeError, "Unable to read filesystem" RuntimeError: Unable to read filesystem Error: Boot loader didn't return any data! [root@medusa1 ~]# [root@medusa1 ~]# uname -a Linux medusa1 2.6.16-1.2080_FC5xen0 #1 SMP Tue Mar 28 04:13:51 EST 2006 i686 i686 i386 GNU/Linux [root@medusa1 ~]# rpm -qa | grep -i xen xen-3.0.1-4 kernel-xen0-2.6.16-1.2080_FC5 Thanks ! -ansh

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RE: [Fedora-xen] Can not boot vm guest rhel4 with smp kernel on FC5with vt enabled hardware (Intel)
by You, Yongkang 15 May '06

15 May '06

Hi Thomas, Did your Xen0 is EM64T (IA32E)? Could you try with opening acpi=1 and apic=1 in the HVM config file. Best Regards, Yongkang (Kangkang) 永康 ________________________________ From: fedora-xen-bounces(a)redhat.com [mailto:fedora-xen-bounces@redhat.com] On Behalf Of thomas.vonsteiger(a)bluewin.ch Sent: 2006年5月13日 14:57 To: fedora-xen(a)redhat.com Subject: [Fedora-xen] Can not boot vm guest rhel4 with smp kernel on FC5with vt enabled hardware (Intel) Hi, I have running rhel4 vm guest on fc5 on VT hardware. Becose i can boot only with single core kernel 2.6.9-34.EL If I try to boot kernel-smp 2.6.9-34.EL with vcpus 2, boot is hanging by.. “Uncompressing Linux … Ok, booting the kernel.” There is no errors, no output on serial console. Anyone see the same effect ? I using this config: # Automatically generated xen config file name = "rhel4_2" builder = "hvm" memory = "256" acpi = 0 apic = 0 pea = 0 vcpus = 2 disk = [ 'phy:/dev/datavg/xenRHEL4_2,ioemu:hda,w' ] vif = [ 'type=ioemu,bridge=xenbr0,mac=00:16:3e:09:e8:e0' ] on_reboot = 'restart' on_crash = 'restart' kernel = '/usr/lib/xen/boot/hvmloader' device_model = '/usr/lib/xen/bin/qemu-dm' #cdrom = '/archiv/iso/RHEL4-U3-i386-AS-disc1.iso' boot = 'c' sdl = 0 # use SDL for graphics vnc = 1 # use VNC for graphics vncviewer = 0 # spawn vncviewer by default nographic = 0 # don't use graphics serial='pty' # enable serial console regards, thomas

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Install of guest
by Jon Griffin 14 May '06

14 May '06

Is there a site that actually explains how to setup a guest? The page at http://fedoraproject.org/wiki/FedoraXenQuickstartFC5#head-51f62872ad12e009d…, seems to assume you know how to setup the disk image. I installed the kernels kernel-xenU-2.6.16-1.2096_FC5 kernel-xen0-2.6.16-1.2111_FC5 xen-3.0.1-4 kernel-xenU-2.6.16-1.2111_FC5 kernel-xen0-2.6.16-1.2096_FC5 But don't understand about making the actual install location asked for in xenguest-install.py I am coming from a lot of years on gentoo, so my knowledge of fedora is minimal.

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Can not boot vm guest rhel4 with smp kernel on FC5 with vt enabled hardware (Intel)
by Thomas von Steiger 13 May '06

13 May '06

Hi, I have running rhel4 vm guest on fc5 on VT hardware. Becose i can boot only with single core kernel 2.6.9-34.EL If I try to boot kernel-smp 2.6.9-34.EL with vcpus 2, boot is hanging by.. "Uncompressing Linux . Ok, booting the kernel." There is no errors, no output on serial console. Anyone see the same effect ? I using this config: # Automatically generated xen config file name = "rhel4_2" builder = "hvm" memory = "256" acpi = 0 apic = 0 pea = 0 vcpus = 2 disk = [ 'phy:/dev/datavg/xenRHEL4_2,ioemu:hda,w' ] vif = [ 'type=ioemu,bridge=xenbr0,mac=00:16:3e:09:e8:e0' ] on_reboot = 'restart' on_crash = 'restart' kernel = '/usr/lib/xen/boot/hvmloader' device_model = '/usr/lib/xen/bin/qemu-dm' #cdrom = '/archiv/iso/RHEL4-U3-i386-AS-disc1.iso' boot = 'c' sdl = 0 # use SDL for graphics vnc = 1 # use VNC for graphics vncviewer = 0 # spawn vncviewer by default nographic = 0 # don't use graphics serial='pty' # enable serial console regards, thomas

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Problem starting Xen guest From SSH - Fedora5
by sicurezza＠virtualsolution.net 12 May '06

12 May '06

Hi all, When i start xen guest from console all is OK but i have this error if i try to start from SSH: [root@fedora bin]# /usr/sbin/xm create -c virtual7 Using config file "/etc/xen/virtual7". Traceback (most recent call last): File "/usr/bin/pygrub", line 258, in ? curses.wrapper(run_main) File "/usr/lib/python2.4/curses/wrapper.py", line 44, in wrapper return func(stdscr, *args, **kwds) File "/usr/bin/pygrub", line 214, in run_main sel = main(cf) File "/usr/bin/pygrub", line 162, in main (stdscr, win) = draw_window() File "/usr/bin/pygrub", line 33, in draw_window curses.use_default_colors() _curses.error: use_default_colors() returned ERR Error: Boot loader didn't return any data! Any Ideas ? Thanks This is my envirorment: OS: Fedora core 5 XEN version: Name : xen Relocations: (not relocatable) Version : 3.0.2 Vendor: Red Hat, Inc. Release : 0.FC5.1 Build Date: gio 04 mag 2006 17:27:42 CEST Install Date: ven 12 mag 2006 18:45:01 CEST Build Host: hs20-bc1-5.build.redhat.com Group : Development/Libraries Source RPM: xen-3.0.2-0.FC5.1.src.rpm Size : 3903916 License: GPL Signature : DSA/SHA1, gio 04 mag 2006 19:03:45 CEST, Key ID da84cbd430c9ecf8 Packager : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla> URL : http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html Kernel version: kernel-xen0-2.6.16-1.2096_FC5.i686.rpm Kernel guest version: 2.6.15-1.2054_FC5xenU --------------------------------------------------------------------------------- [root@fedora bin]# cat /usr/bin/pygrub #!/usr/bin/python # # pygrub - simple python-based bootloader for Xen # # Copyright 2005 Red Hat, Inc. # Jeremy Katz <katzj(a)redhat.com> # # This software may be freely redistributed under the terms of the GNU # general public license. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. # import os, sys, string, struct, tempfile import logging import curses, _curses, curses.wrapper import getopt sys.path = [ '/usr/lib/python' ] + sys.path import grub.GrubConf import grub.fsys PYGRUB_VER = 0.3 def draw_window(): stdscr = curses.initscr() if hasattr(curses, 'use_default_colors'): curses.use_default_colors() try: curses.curs_set(0) except _curses.error: pass stdscr.addstr(1, 4, "pyGRUB version %s" %(PYGRUB_VER,)) win = curses.newwin(10, 74, 2, 1) win.box() win.refresh() stdscr.addstr(12, 5, "Use the U and D keys to select which entry is highlighted.") stdscr.addstr(13, 5, "Press enter to boot the selected OS. 'e' to edit the") stdscr.addstr(14, 5, "commands before booting, 'a' to modify the kernel arguments ") stdscr.addstr(15, 5, "before booting, or 'c' for a command line.") stdscr.addch(12, 13, curses.ACS_UARROW) stdscr.addch(12, 19, curses.ACS_DARROW) (y, x) = stdscr.getmaxyx() stdscr.move(y - 1, x - 1) stdscr.refresh() return (stdscr, win) def fill_entries(win, cfg, selected): y = 0 for i in cfg.images: if (0, y) > win.getmaxyx(): break if y == selected: attr = curses.A_REVERSE else: attr = 0 win.addstr(y + 1, 2, i.title.ljust(70), attr) y += 1 win.refresh() def select(win, line): win.attron(curses.A_REVERSE) win.redrawln(line + 1, 1) win.refresh() def is_disk_image(file): fd = os.open(file, os.O_RDONLY) buf = os.read(fd, 512) os.close(fd) if len(buf) >= 512 and struct.unpack("H", buf[0x1fe: 0x200]) == (0xaa55,): return True return False SECTOR_SIZE=512 def get_active_offset(file): """Find the offset for the start of the first active partition in the disk image file.""" fd = os.open(file, os.O_RDONLY) buf = os.read(fd, 512) for poff in (446, 462, 478, 494): # partition offsets # active partition has 0x80 as the first byte if struct.unpack("<c", buf[poff:poff+1]) == ('\x80',): return struct.unpack("<L", buf[poff+8:poff+12])[0] * SECTOR_SIZE return -1 def get_config(fn, isconfig = False): if not os.access(fn, os.R_OK): raise RuntimeError, "Unable to access %s" %(fn,) cf = grub.GrubConf.GrubConfigFile() if isconfig: # set the config file and parse it cf.filename = fn cf.parse() return cf offset = 0 if is_disk_image(fn): offset = get_active_offset(fn) if offset == -1: raise RuntimeError, "Unable to find active partition on disk" # open the image and read the grub config fs = None for fstype in grub.fsys.fstypes.values(): if fstype.sniff_magic(fn, offset): fs = fstype.open_fs(fn, offset) break if fs is not None: grubfile = None for f in ("/boot/grub/menu.lst", "/boot/grub/grub.conf", "/grub/menu.lst", "/grub/grub.conf"): if fs.file_exist(f): grubfile = f break if grubfile is None: raise RuntimeError, "we couldn't find /boot/grub{menu.lst,grub.conf} " + \ "in the image provided. halt!" f = fs.open_file(grubfile) buf = f.read() f.close() fs.close() # then parse the grub config cf.parse(buf) else: raise RuntimeError, "Unable to read filesystem" return cf def get_entry_idx(cf, entry): # first, see if the given entry is numeric try: idx = string.atoi(entry) return idx except ValueError: pass # it's not, now check the labels for a match for i in range(len(cf.images)): if entry == cf.images[i].title: return i return None def main(cf = None): mytime = 0 timeout = int(cf.timeout) (stdscr, win) = draw_window() stdscr.timeout(1000) selected = cf.default while (timeout == -1 or mytime < int(timeout)): if timeout != -1 and mytime != -1: stdscr.addstr(20, 5, "Will boot selected entry in %2d seconds" %(int(timeout) - mytime)) else: stdscr.addstr(20, 5, " " * 80) fill_entries(win, cf, selected) c = stdscr.getch() if mytime != -1: mytime += 1 # if c == ord('q'): # selected = -1 # break if c == ord('c'): # FIXME: needs to go to command line mode continue elif c == ord('a'): # FIXME: needs to go to append mode continue elif c == ord('e'): # FIXME: needs to go to edit mode continue elif c in (curses.KEY_ENTER, ord('\n'), ord('\r')): break elif c == curses.KEY_UP: mytime = -1 selected -= 1 elif c == curses.KEY_DOWN: mytime = -1 selected += 1 else: pass # bound at the top and bottom if selected < 0: selected = 0 elif selected >= len(cf.images): selected = len(cf.images) - 1 if selected >= 0: return selected if __name__ == "__main__": sel = None def run_main(scr, *args): global sel sel = main(cf) def usage(): print >> sys.stderr, "Usage: %s [-q|--quiet] [--output=] [--entry=] <image>" %(sys.argv[0],) try: opts, args = getopt.gnu_getopt(sys.argv[1:], 'qh::', ["quiet", "help", "output=", "entry=", "isconfig"]) except getopt.GetoptError: usage() sys.exit(1) if len(args) < 1: usage() sys.exit(1) file = args[0] output = None entry = None interactive = True isconfig = False for o, a in opts: if o in ("-q", "--quiet"): interactive = False elif o in ("-h", "--help"): usage() sys.exit() elif o in ("--output",): output = a elif o in ("--entry",): entry = a # specifying the entry to boot implies non-interactive interactive = False elif o in ("--isconfig",): isconfig = True if output is None or output == "-": fd = sys.stdout.fileno() else: fd = os.open(output, os.O_WRONLY) cf = get_config(file, isconfig) if interactive: curses.wrapper(run_main) else: sel = cf.default # set the entry to boot as requested if entry is not None: idx = get_entry_idx(cf, entry) if idx is not None and idx > 0 and idx < len(cf.images): sel = idx img = cf.images[sel] print "Going to boot %s" %(img.title) print " kernel: %s" %(img.kernel[1],) if img.initrd: print " initrd: %s" %(img.initrd[1],) offset = 0 if is_disk_image(file): offset = get_active_offset(file) if offset == -1: raise RuntimeError, "Unable to find active partition on disk" # read the kernel and initrd onto the hostfs fs = None for fstype in grub.fsys.fstypes.values(): if fstype.sniff_magic(file, offset): fs = fstype.open_fs(file, offset) break if fs is None: raise RuntimeError, "Unable to open filesystem" kernel = fs.open_file(img.kernel[1],).read() (tfd, fn) = tempfile.mkstemp(prefix="vmlinuz.", dir="/var/lib/xen") os.write(tfd, kernel) os.close(tfd) sxp = "linux (kernel %s)" %(fn,) if img.initrd: initrd = fs.open_file(img.initrd[1],).read() (tfd, fn) = tempfile.mkstemp(prefix="initrd.", dir="/var/lib/xen") os.write(tfd, initrd) os.close(tfd) sxp += "(ramdisk %s)" %(fn,) else: initrd = None sxp += "(args '%s')" %(img.args,) sys.stdout.flush() os.write(fd, sxp) ---------------------------------------------------------------------------------

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xenguest-install.py, DomU network fails
by Riaan van Niekerk 12 May '06

12 May '06

I am trying to install FC5 xen guests in a FC5 host, but it looks as if networking fails to come up. relevant info: - Centrino M laptop - install tree is also on laptop I tried the installtree over NFS and HTTP, with the following commandlines and error messages: xenguest-install.py -n vm1 -f /d/vm/vm1.vmdk -s 2 -r 256 -l http://192.168.3.35/5 -x "lang=en_US.UTF-8 keymap=us ip=192.168.3.39 vnc" /5/Fedora/base/stage2.img: Failed to connect to HTTP server and Unable to retrieve http://192.168.3.35/5/Fedora/base/stage2.img: Failed (I can wget the file from the host though) xenguest-install.py -n vm1 -f /d/vm/vm1.vmdk -s 2 -r 256 -l nfs:192.168.3.35:/data/fc/5/ -x "lang=en_US.UTF-8 keymap=us ip=192.168.3.39 vnc" That directory could not be mounted from the server. in the apache logs, I can see that the host, .35 is downloading images/xen/vmlinuz and images/xen/initrd.img but there is nothing in the logs which show that .39 comes up and tries to get stage2.img I have to assume that the interface in DomU does not come up correctly and no IP is assigned to this interface. Bridging looks correct: how bridge name bridge id STP enabled interfaces xenbr0 8000.feffffffffff no peth0 vif0.0 vif1.0 Any ideas on how to fix/troubleshoot this further? Also, does anyone know how to install off a CD-ROM image? the file /usr/sbin/xenguest-install.py has references to cdrom but I see no way to point the installer at anything but nfs, ftp or http. TIA Riaan

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xen May 2006