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[Libvir] problems using libvirt to mange "defined" domains.
by Evan Bigall 26 Oct '07

26 Oct '07

I'm having a problem using libvirt to manage "defined" domains (ie: domains for which it has XML, but are not running.) I have tried several debugging scenarios, but the simplest one is this. In a libvirt C program I define the following XML: char domxml[]="<domain type='xen' id='99'>" "<name>rhel5vm</name>" "<uuid>f948d7f4f36c4bfae8053bca535183b3</uuid>" "<os>" "<type>linux</type>" "<kernel>/var/lib/xen/boot/rhel5vm/vmlinuz-2.6.18-8.el5xen</kernel>" "<initrd>/var/lib/xen/boot/rhel5vm/initrd-2.6.18-8.el5xen.img</initrd>" "<root>/dev/xvda1</root>" "</os>" "<memory>512000</memory>" "<vcpu>1</vcpu>" "<on_poweroff>destroy</on_poweroff>" "<on_reboot>restart</on_reboot>" "<on_crash>restart</on_crash>" "<devices>" "<interface type='bridge'>" "<source bridge='xenbr0'/>" "<mac address='00:16:3e:09:ef:b0'/>" "<script path='vif-bridge'/>" "</interface>" "<disk type='block' device='disk'>" "<driver name='phy'/>" "<source dev='/dev/sda3'/>" "<target dev='xvda'/>" "</disk>" "<console tty='/dev/pts/2'/>" "</devices>" "</domain>"; (I've played with several values for the domain id). What I find is that when I use virDomainDefineXML() to define the domain, for some reason it drops, the "root" element from the "os" specification. Because of this the domain then crashes when I try to start it. I've also tried, using virsh to create the domain from an XML file, capture the XML with virDomainGetXMLDesc(), pause the C program, and then try to redefine the domain with the domain with the exact XML virDomainGetXMLDesc() gave me (after destroying the original of course), and I get the same behavior, it strips the root element from the OS specification. Here is the version information: [root@rhel5-xen tmp]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 5 (Tikanga) [root@rhel5-xen tmp]# uname -a Linux rhel5-xen 2.6.18-8.1.8.el5xen #1 SMP Mon Jun 25 17:19:38 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux [root@rhel5-xen tmp]# virsh version Compiled against library: libvir 0.3.1 Using library: libvir 0.3.1 Using API: Xen 3.0.1 Running hypervisor: Xen 3.0.0 I am using rhel5 "out of the box" with libvirt upgraded to: libvirt-0.3.1-1.x86_64.rpm libvirt-devel-0.3.1-1.x86_64.rpm libvirt-python-0.3.1-1.x86_64.rpm I tried using libvirt-0.3.2-1, but sample code segv'd in virConnectClose(). All I'm really trying to do is build a primitive interface to list domains (both running, and non-running), and start and stop them. I'm open to suggestions as to whether I have this misconfigured or if there would be a better version with which to do this. Thanks, Evan

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Re: [Libvir] Creating a Domain
by Richard W.M. Jones 26 Oct '07

26 Oct '07

chetan saundankar wrote: > "the API should not be targetted to a single virtualization environment > though Xen is the current default...." > Does this mean that other virtualization environments say VMWare ESX > server management can also be done with future releases of Libvirt? If > yes then when do you expect to roll out that feature? That's certainly an aspiration. However there is no firm date for VMWare support at this time. Currently we have support for Xen, QEMU, KVM and OpenVZ. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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[Libvir] Creating a Domain
by chetan saundankar 26 Oct '07

26 Oct '07

Hi all, I am new to Libvirt. I have few questions on how to create a guest domain using libvirt, 1. I want to create a guest and say install FC6 in it. Can it be done using "virDomainCreate" or "virDomainCreateLinux" calls? and specifying iso image in Domain description XML e.g. <disk type='file' device='cdrom'> <source file='/root/chelsea/fc6-x86.iso'/> <target dev='hdc'/> <readonly/> </disk> 2. In the Domain Description XML for Fully virtualized guests there is <uuid> tag so if the above mentioned method is used to create guests then is it the callers responsibility to provide a unique uuid? Thanks Chetan <http://libvirt.org/html/libvirt-libvirt.html#virDomainCreate>

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[Libvir] Bash completions for virsh
by David Lutterkort 26 Oct '07

26 Oct '07

The attached file provides tab completion for virsh. To use them, just source the file in bash; after that, typing 'virsh <TAB>' should do something sensible (if you are on KVM, you also need to have VIRSH_DEFAULT_CONNECT_URI set, otherwise virsh will complain when trying to gather various info during completion. Could this be added to the libvirt CVS in some appropriate place ? The RPM should probably install it in /etc/bash_completion.d/ David

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[Libvir] detect overflow in string-to-int conversion
by Jim Meyering 24 Oct '07

24 Oct '07

Hi, Not a big deal, but it's better not to accept a bogus "4294967297" and silently map it to "1". Don't accept an arbitrarily-long string of digits. * src/xml.c (parseNumber): Detect overflow. diff --git a/src/xml.c b/src/xml.c index 3e92040..5011dc2 100644 --- a/src/xml.c +++ b/src/xml.c @@ -1,7 +1,7 @@ /* * xml.c: XML based interfaces for the libvir library * - * Copyright (C) 2005 Red Hat, Inc. + * Copyright (C) 2005, 2007 Red Hat, Inc. * * See COPYING.LIB for the License of this software * @@ -77,7 +77,7 @@ skipSpaces(const char **str) { * * Parse a number * - * Returns the CPU number or -1 in case of error. @str will be + * Returns the unsigned number or -1 in case of error. @str will be * updated to skip the number. */ static int @@ -89,8 +89,11 @@ parseNumber(const char **str) { return(-1); while ((*cur >= '0') && (*cur <= '9')) { - ret = ret * 10 + (*cur - '0'); - cur++; + unsigned int c = *cur - '0'; + if (ret > INT_MAX / 10 || (ret == INT_MAX / 10 && c > INT_MAX % 10)) + return(-1); + ret = ret * 10 + c; + cur++; } *str = cur; return(ret);

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[Libvir] virt-install : *** glibc detected *** /usr/bin/python: free(): invalid pointer *** ***
by suyash jape 24 Oct '07

24 Oct '07

Hi all I am getting the following output when i try to use virt-install [root@localhost]# virt-install *** glibc detected *** /usr/bin/python: free(): invalid pointer: 0x08bea0a0 *** ======= Backtrace: ========= /lib/i686/nosegneg/libc.so.6[0x2f89b1] /lib/i686/nosegneg/libc.so.6(cfree+0x90)[0x2fc060] /usr/lib/libvirt.so.0[0xb2885e] /usr/lib/libvirt.so.0[0xb2a07b] /usr/lib/libvirt.so.0[0xb019d3] /usr/lib/python2.5/site-packages/libvirtmod.so(libvirt_virConnectOpen+0x66)[0xf09ce6] . . . . b7d25000-b7f25000 r--p 00000000 fd:00 312403 /usr/lib/locale/locale-archive b7f25000-b7fa9000 rw-p b7f25000 00:00 0 b7fb4000-b7fb5000 rw-p b7fb4000 00:00 0 bff2a000-bff4a000 rw-p bff2a000 00:00 0 [stack] Aborted My package versions : [root@localhost ~]# rpm -qa|grep libvirt libvirt-0.3.3-1.fc7 libvirt-python-0.3.3-1.fc7 [root@localhost ~]# uname -a Linux localhost.localdomain 2.6.20-2936.fc7xen #1 SMP Fri Sep 21 12:07:35 EDT 2007 i686 i686 i386 GNU/Linux [root@localhost ~]# rpm -qa|grep xen xen-libs-3.1.0-6.fc7 xen-devel-3.1.0-6.fc7 xen-3.1.0-6.fc7 kernel-xen-2.6.20-2936.fc7 kernel-xen-devel-2.6.20-2936.fc7 I have attached the full back trace if anyone is interested Any suggestions ? Thanks Suyash

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[Libvir] virt-install virt-install virt-install : *** glibc detected *** /usr/bin/python: free(): invalid pointer *** *** glibc detected *** /usr/bin/python: free(): invalid pointer: ******
by suyash jape 24 Oct '07

24 Oct '07

Hi I am getting the following output when i try to use virt-install [root@localhost]# virt-install *** glibc detected *** /usr/bin/python: free(): invalid pointer: 0x08bea0a0 *** ======= Backtrace: ========= /lib/i686/nosegneg/libc.so.6[0x2f89b1] /lib/i686/nosegneg/libc.so.6(cfree+0x90)[0x2fc060] /usr/lib/libvirt.so.0[0xb2885e] /usr/lib/libvirt.so.0[0xb2a07b] /usr/lib/libvirt.so.0[0xb019d3] /usr/lib/python2.5/site-packages/libvirtmod.so(libvirt_virConnectOpen+0x66)[0xf09ce6] . . . . b7d25000-b7f25000 r--p 00000000 fd:00 312403 /usr/lib/locale/locale-archive b7f25000-b7fa9000 rw-p b7f25000 00:00 0 b7fb4000-b7fb5000 rw-p b7fb4000 00:00 0 bff2a000-bff4a000 rw-p bff2a000 00:00 0 [stack] Aborted My package versions : [root@localhost ~]# rpm -qa|grep libvirt libvirt-0.3.3-1.fc7 libvirt-python-0.3.3-1.fc7 [root@localhost ~]# uname -a Linux localhost.localdomain 2.6.20-2936.fc7xen #1 SMP Fri Sep 21 12:07:35 EDT 2007 i686 i686 i386 GNU/Linux [root@localhost ~]# rpm -qa|grep xen xen-libs-3.1.0-6.fc7 xen-devel-3.1.0-6.fc7 xen-3.1.0-6.fc7 kernel-xen-2.6.20-2936.fc7 kernel-xen-devel-2.6.20-2936.fc7 I have attached the full back trace if anyone is interested Any suggestions ? Thanks Suyash

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[Libvir] Re: Should we settle on one SSL implementation?
by Richard W.M. Jones 23 Oct '07

23 Oct '07

Bernardo Innocenti wrote: > I remember this topic being discussed some time ago, > but software is fluid and maybe it's time to respin > the topic. > > It would seem a worthwhile goal to unify SSL/TLS > implementations like we did for spell checkers. > Or, if it turns out to be too hard, at least it would > be nice to their pki files. I've asked whether we have a standard layout for /etc/pki before, but no one seems to know. > We're now shipping no less than 4 different implementations > of SSL: > > - openssl (OpenBSD's implementation) > - nss (Netscape's implementation) > - gnutls (LGPL implementation) > - puretls (Java implementation) Make that at least five - ocaml-ocamlnet has a pure-OCaml SSL impl. I'm sure Perl & Python probably have their own too. > But which one should replace the others? When we implemented encryption in libvirt, we chose gnutls because it has excellent examples which allow you to actually write code to use it in a short period of time. The others have (or we perceived them to have) hideous, confusing or undocumented APIs. For a short while I documented the certificate management code in terms of the OpenSSL command line tools. But after I found out about 'certtool' (part of GnuTLS), I was able to rewrite that documentation and make it considerably simpler[1]. 'certtool' is a lot more sane than the OpenSSL stuff. Nevertheless, I don't think you're going to get rid of the competing SSL libraries. Rewriting code to use a different API is a lot of make-work that no one wants to do, and doesn't contribute much benefit to anyone. Rich. [1] http://libvirt.org/remote.html#Remote_certificates -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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[Libvir] Small cleanup patch for Xen NUMA
by Daniel Veillard 22 Oct '07

22 Oct '07

xenHypervisorNodeGetCellsFreeMemory was calling xend to find the number of cells on a node and keeping the information thereafter in a static variable. This patch just move the lookup code in the xen_unified driver, using the unified call (and hence the hypervisor instead of xend rpc). Provides the same for CPUs. Also helps centralizing those lookup in case Xen supports dynamic CPUs or cells in the future. Daniel -- Red Hat Virtualization group http://redhat.com/virtualization/ Daniel Veillard | virtualization library http://libvirt.org/ veillard(a)redhat.com | libxml GNOME XML XSLT toolkit http://xmlsoft.org/ http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/

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[Libvir] PATCH: 0/4 Implement CDROM media change for QEMU/KVM driver
by Daniel P. Berrange 22 Oct '07

22 Oct '07

This series of patches provides CDROM media change for QEMU/KVM driver. It builds on the previous patch, incorporating the feedback everyone gave. I split the refactoring out from the main new feature patch hence the series of 4... Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=|

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