August 2008 - Devel - libvirt List Archives

[libvirt] Proposed functionality: API to extract host description from saved state, restore with modified XML
by Charles Duffy 27 Aug '08

27 Aug '08

Per subject. Obviously only for use by folks who *really* know what they're doing. :) I'm looking for the ability to restore a snapshot saved with domain.save(), with disk images pointing at a different location (in my particular use case, pointing at a an empty copy-and-write image backending into a snapshot of the old disk state). Further, as I may run multiple copies of the same host at once (from the same initial state, against different copy-on-write disk images backending into the same read-only store, into different disconnected networks), the UUID as well as the name may need to be changed. I could just rewrite the header of the saved-state file, but this has a few disadvantages: - To mimic the copy-on-write behavior of the disk images, I would need to copy the entire saved-domain file. I'm trying to minimize the time and disk penalty of snapshot/restore, so this is suboptimal. - My code is dependent on the file format used by the particular backend, and may break when that backend is revved. Would a patch adding API calls to - return the XML description of a saved host, given the name - restore a saved host with a different description be considered welcome? I presume that to maintain backwards compatibility, the latter would be expected to be exposed to clients via a new call, rather than adding a parameter to virDomainRestore(); in communicating with the drivers, on the other hand, my first instinct would be to add an extra parameter to virDrvDomainRestore. Thanks!

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[libvirt] virConnectOpenReadOnly?
by Jun Koi 27 Aug '08

27 Aug '08

Hi, According to the comment of virConnectOpenReadOnly, this function has some restrictions on available methods to control domains. Could you be more specific? What kind of restrictions we are having (compare to virConnectOpen())? And when should we use virConnectOpenReadOnly() instead of virConnectOpen() ? Thanks, Jun

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[libvirt] Error compiling libvirt 0.4.4
by Everton P. Alexandre 27 Aug '08

27 Aug '08

hi I'm trying to compile the libvirt 0.4.4. I'm getting the error below: gcc -DHAVE_CONFIG_H -I. -I.. -I../gnulib/lib -I../gnulib/lib -I../include -I../include -I../qemud -I/usr/local/include/libxml2 -DBINDIR=\"/usr/local/libexec\" -DSBINDIR=\"/usr/local/sbin\" -DSYSCONF_DIR=\"/usr/local/etc\" -DLOCALEBASEDIR=\"/usr/local/share/locale\" -DLOCAL_STATE_DIR=\"/usr/local/var\" -DGETTEXT_PACKAGE=\"libvirt\" -Wall -Wformat -Wformat-security -Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wextra -Wshadow -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Winline -Wredundant-decls -Wno-sign-compare -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fasynchronous-unwind-tables -DWITH_QEMU -DWITH_TEST -DWITH_REMOTE -DWITH_LIBVIRTD -DWITH_XEN -DIN_LIBVIRT -g -O2 -MT libvirt_la-xen_unified.lo -MD -MP -MF .deps/libvirt_la-xen_unified.Tpo -c xen_unified.c -fPIC -DPIC -o .libs/libvirt_la-xen_unified.o In file included from /usr/include/xen/dom0_ops.h:31, from xen_unified.c:29: /usr/include/xen/xen.h:578: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'char' /usr/include/xen/xen.h:579: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'short' /usr/include/xen/xen.h:580: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int' /usr/include/xen/xen.h:581: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'long' make[2]: *** [libvirt_la-xen_unified.lo] Error 1 make[2]: Leaving directory `/home/everton/libvirt-0.4.4/src' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/everton/libvirt-0.4.4' make: *** [all] Error 2 Thank you Everton Alexandre --------------------------------- Novos endereços, o Yahoo! que você conhece. Crie um email novo com a sua cara @ymail.com ou @rocketmail.com.

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[libvirt] LIBVIR_VERSION_NUMBER ?
by Jun Koi 27 Aug '08

27 Aug '08

Hi, According to libvirt.h: /** * LIBVIR_VERSION_NUMBER: * * Macro providing the version of the library as * version * 1,000,000 + minor * 1000 + micro */ #define LIBVIR_VERSION_NUMBER 4004 The comment is incorrect, as 4004 is not how it is supposed to be. So we should fix either the comment (better?), or the version. Thanks, Jun

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[libvirt] libvir: Xen error : Domain not found: xenUnifiedDomainLookupByID
by mantra UNIX 27 Aug '08

27 Aug '08

Hi, After rebooting/shutdown/poweroff a domU any of the "virsh" commands display the above error message. Only way to get rid of it is via "reboot", this sucks ! I am using RHEL5.2 with all the updates applied. Whats the alternative ? -- Regards, mantra - Instrument of Thought

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RE: [libvirt] DISREGARD Problems starting XEN HVM with libvirt
by Matthew Donovan 26 Aug '08

26 Aug '08

It turns out everything was booting, they just weren't configured to give a console or display a GUI window. -matthew > -----Original Message----- > From: Matthew Donovan [mailto:matthew@atc-nycorp.com] > Sent: Tuesday, August 26, 2008 9:25 AM > To: libvir-list(a)redhat.com > Subject: [libvirt] Problems starting XEN HVM with libvirt > > I've been having trouble getting a Xen HVM guest started > using libvirt. > I've tried Windows Vista, Fedora Core 8, and Fedora Core 6 > guests. Domain 0 > is FC 8. The only guest that starts correctly is the FC 6 guest. Has > anyone else encountered something like this? Is there a > master list of > guest OS's that libvirt supports? > > Thanks > -matthew > > > CODE: > > #include <stdio.h> > #include <libvirt/libvirt.h> > #include <libvirt/virterror.h> > > > const char* foo = > "<domain type='xen'>" > "<name>fc6</name>" > "<os>" > "<type>hvm</type>" > "<loader>/usr/lib/xen/boot/hvmloader</loader>" > "<boot dev='hd'/>" > "</os>" > "<memory>512000</memory>" > "<vcpu>1</vcpu>" > "<on_shutdown>shutdown</on_shutdown>" > "<on_reboot>restart</on_reboot>" > "<on_crash>restart</on_crash>" > "<features>" > "<pae/>" > "<acpi/>" > "<apic/>" > "</features>" > "<clock sync='localtime'/>" > "<devices>" > "<emulator>/usr/lib/xen/bin/qemu-dm</emulator>" > "<disk type='block'>" > "<source dev='/dev/vgvms/fc6_test'/>" > "<target dev='hda'/>" > "</disk>" > "<interface type='ioemu'>" > "<mac address='7A:AB:D0:01:82:98'/>" > "</interface>" > "<input type='tablet' bus='usb'/>" > "<graphics type='sdl' password=''/>" > "<serial type='pty'/>" > "</devices>" > "</domain>"; > > > int main (int argc, char** argv) > { > virConnectPtr con; /* connection to the Xen hypervisor */ > virDomainPtr domain; > > virInitialize(); > > con = virConnectOpen ("xen:///"); > if (!con) { > virErrorPtr err = virGetLastError (); > printf ("virConnectOpen failed: %s\n", > err->message); > return -1; > } > > domain = virDomainDefineXML (con, foo); > if (!domain) { > virErrorPtr err = virConnGetLastError (con); > printf ("virDomainDefineXML failed: %s\n", > err->message); > > } else { > > if (virDomainCreate (domain) < 0) { > virErrorPtr err = virConnGetLastError (con); > printf ("virDomainCreate failed: %s\n", > err->message); > } else { > virDomainInfo info = {0}; > virDomainGetInfo (domain, &info); > printf ("state = %d\n", info.state); > getchar (); > } > } > > virConnectClose (con); > return 0; > } > > -- > Libvir-list mailing list > Libvir-list(a)redhat.com > https://www.redhat.com/mailman/listinfo/libvir-list >

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[libvirt] Problems starting XEN HVM with libvirt
by Matthew Donovan 26 Aug '08

26 Aug '08

I've been having trouble getting a Xen HVM guest started using libvirt. I've tried Windows Vista, Fedora Core 8, and Fedora Core 6 guests. Domain 0 is FC 8. The only guest that starts correctly is the FC 6 guest. Has anyone else encountered something like this? Is there a master list of guest OS's that libvirt supports? Thanks -matthew CODE: #include <stdio.h> #include <libvirt/libvirt.h> #include <libvirt/virterror.h> const char* foo = "<domain type='xen'>" "<name>fc6</name>" "<os>" "<type>hvm</type>" "<loader>/usr/lib/xen/boot/hvmloader</loader>" "<boot dev='hd'/>" "</os>" "<memory>512000</memory>" "<vcpu>1</vcpu>" "<on_shutdown>shutdown</on_shutdown>" "<on_reboot>restart</on_reboot>" "<on_crash>restart</on_crash>" "<features>" "<pae/>" "<acpi/>" "<apic/>" "</features>" "<clock sync='localtime'/>" "<devices>" "<emulator>/usr/lib/xen/bin/qemu-dm</emulator>" "<disk type='block'>" "<source dev='/dev/vgvms/fc6_test'/>" "<target dev='hda'/>" "</disk>" "<interface type='ioemu'>" "<mac address='7A:AB:D0:01:82:98'/>" "</interface>" "<input type='tablet' bus='usb'/>" "<graphics type='sdl' password=''/>" "<serial type='pty'/>" "</devices>" "</domain>"; int main (int argc, char** argv) { virConnectPtr con; /* connection to the Xen hypervisor */ virDomainPtr domain; virInitialize(); con = virConnectOpen ("xen:///"); if (!con) { virErrorPtr err = virGetLastError (); printf ("virConnectOpen failed: %s\n", err->message); return -1; } domain = virDomainDefineXML (con, foo); if (!domain) { virErrorPtr err = virConnGetLastError (con); printf ("virDomainDefineXML failed: %s\n", err->message); } else { if (virDomainCreate (domain) < 0) { virErrorPtr err = virConnGetLastError (con); printf ("virDomainCreate failed: %s\n", err->message); } else { virDomainInfo info = {0}; virDomainGetInfo (domain, &info); printf ("state = %d\n", info.state); getchar (); } } virConnectClose (con); return 0; }

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[libvirt] "static" ip address
by Olivier Deckmyn 26 Aug '08

26 Aug '08

Hi, I'm using KVM with the wonderful help of libvir (virsh), on a to-be-production-ready server of mine. I would like to be able to choose on a way or another the ip of each of my VM. As far as I can understand, the only way to get an IP (from a vm point of view) if the dhcp it. But I have no garantee vm1 will always get x.x.x.1 Ip adress... Is there a solution please ? (googling this list did'nt answer :() Thanx

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[libvirt] libvir: Xen error
by mantra UNIX 25 Aug '08

25 Aug '08

Hello everyone, I get the following error when i try to redtart a domain; # virsh list libvir: Xen error : Domain not found: xenUnifiedDomainLookupByID I am using RHEL5.2 on i386, I have searched for the error on web and on RedHat but could not find any. -- Regards, mantra - Instrument of Thought

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[libvirt] <bootloader /> BUG
by Stefan de Konink 25 Aug '08

25 Aug '08

With the tip of DanB I am currently using the inactive XML storage quite satisfied with the concept of first undefining than starting. But there is still a bug. The inactive XML adds a <bootloader /> tag. Now that is (in my perspective) not a bug, but it it is that libvirt expects a config. In my personal believes the tag shouldn't be there if there is no config; or libvirt should not libvir: Xen Daemon error : POST operation failed: xend_post: error from xen daemon: (xend.err 'Error creating domain: Had a bootloader specified, but no disks are bootable') error: Failed to create domain from /mnt/netapp/users/klant2/mono/index.xml I just checked with the last git version and the bug still exists... I hope someone can look into this asap. It is a blocker for development. Stefan

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