- Devel - libvirt List Archives

[libvirt] Reworked the XML verification patch for svirt
by Daniel J Walsh 03 Apr '09

03 Apr '09

Main goal of this patch it to verify data being written to xml and inform the user when he makes a mistake. Only able to verify static/dynamic in domain_conf. Added verify code to qemu_driver.c for model and potentially label.

3 5

[libvirt] ANNOUNCE: netcf, a platform-agnostic library for network configuration
by David Lutterkort 03 Apr '09

03 Apr '09

I am pleased to announce the availability of netcf 0.0.1, the initial release of a library for managing network configuration in a platform agnostic manner. If I were into code names, this would be the "what have you been waiting for" release. Netcf does its work by directly modifying the 'native' configuration files of the host it is running on; this avoids a whole class of problems caused by similar approaches that do network configuration behind the back of the native mechanisms. The API allows listing of configured interfaces, defining the configuration of an interface, retrieving the same (regardless of whether the interface was initially configured with netcf or not), and bringing interfaces up and down. This functionality is needed both by libvirt and NetworkManager, so it seemed only logical to move their common needs into a separate library. This release is mostly geared at soliciting feedback and sparking spirited reviews. In particular, the API is not stable yet (it will be with the release of netcf 0.1.0) Besides general comments, criticism and the customary praise, I am particularly interested in reviews on the following: * The API (barring any strong objections, I will declare it stable) * The XML schema for describing network interfaces (in data/xml/interface.rng) * General code review Where can I get it ? -------------------- Main website https://fedorahosted.org/netcf/ A tarball can be downloaded from https://fedorahosted.org/released/netcf/ The git repo is at http://git.fedorahosted.org/git/netcf.git git clone git://git.fedorahosted.org/netcf.git For those running Fedora 10, I built some preliminary RPM's and made them available at http://people.redhat.com/dlutter/netcf/download/ (and if you are a Fedora reviewer, the review BZ is 493750 ;) How can I help ? ---------------- Join the mailing list at https://fedorahosted.org/mailman/listinfo/netcf-devel Currently, netcf can set up simple Ethernet interfaces, bridges with enslaved physical devices and bonds on Fedora. This points to two areas where improvements are most needed: * support other Linux distros and operating systems * expand what kind of interfaces netcf can handle (most sorely needed are VLAN's and adding bonds to a bridge) If you can help with either of these two, or anything, really, drop a note on the mailing list so wecan discuss. David

1 0

[libvirt] specifying -serial telnet: in XML
by Sukadev Bhattiprolu 03 Apr '09

03 Apr '09

I run qemu (version 0.9.1 kvm-84) with -serial option as follows: - serial telnet::2445,server so I can telnet to 2445 and have a serial console. I tried specifying this to libvirt (version 0.6.0) using the following stanza: <serial type='tcp'> <source mode="bind" host="127.0.0.1" service="2445"/> <protocol type="telnet"/> <target port="1"/> </serial> I checked /var/log/libvirt/qemu/<guest>.log and found that libvirt added 'nowait' to the serial option: -serial telnet:127.0.0.1:2445,server,nowait which is fine (I think). But when I start my guest, and "telnet 127.0.0.1 2445" I don't get any output even though the guest boots up fine. After the guest boots $ echo foo > /dev/ttyS0 in the guest shows the 'foo' in the telnet window. But I don't get the boot/shutdown messages. I also have the vnc option in the xml, <graphics type='vnc' port='5902' autoport='no' listen='127.0.0.1'/> so if I open vncviewer, I can see the boot messages. The problem with this though is if the kernel fails to boot for some reason, the vncviewer exits and I can't find the reason the boot failed. My kernel boot command line has 'console=ttyS0' option. Is there anything else I need to ensure 'telnet 127.0.0.1 port' displays the messages ? Thanks, Sukadev

2 2

[libvirt] [PATCH] Openvz: how to use a nondefault config
by Anton Protopopov 03 Apr '09

03 Apr '09

Hi all. When libvirt creates an OpenVZ machine, it does smth like # vzctl create $ctid --ostemplate `ostemplate` And we can't specify an --config `config` argument. In this case vzctl chooses a default config file (a value of CONFIG variable from /etc/vz/vz.conf). But there are cases when we want to specify a config file directly, as in # vzctl create $ctid --ostemplate `ostemplate` --config `config` I think, that we can try to use the same `ostemplate` name as --config value, if corresponding template exists, i.e., if there is a file /etc/vz/conf/ve-`ostemplate`.conf-sample, libvirt will run a command # vzctl create $ctid --ostemplate `ostemplate` --config `ostemplate` Otherwise, it will run it's default command # vzctl create $ctid --ostemplate `ostemplate` (the same arguments.) ----------- Example of creating a machine with nondefault config: 1. Create /etc/vz/conf/ve-altlinux-test.conf-sample 2. Create /var/lib/vz/template/cache/altlinux-test.tar 3. Use libvirt with (hypothetical) XML: <domain type="openvz"> <name>100</name> <memory>1</memory> <os><type>exe</type></os> <devices> <filesystem type="template"> <source name="altlinux-test"/> <target dir="/"/> </filesystem> </devices> </domain> ----------- Example of creating a machine with default config: 1. Ensure there is no /etc/vz/conf/ve-altlinux-test.conf-sample 2. Create /var/lib/vz/template/cache/altlinux-test.tar 3. Use libvirt with (the same as above) XML file -----------

4 7

[libvirt] SYSCONF_DIR
by Zvi Dubitzky 03 Apr '09

03 Apr '09

I can do TLS certificate authentication on a remote libvirt access through 'virsh' ( virsh -c qemu+tls://hostnake/system) . But when I try same auth from my C code linked with libvirt 0.6.1 I get the message : " libvir: Remote error: cannot access CA certificate '/usr/local/etc/pki/CA/cacert.pem . No such file or directory" My certificate is at /etc/pki/CA as instructed in the web site (deafult) and so is my libvirtd.conf saying. virsh works ok with it . In my case the server and client are on same machine . I guess the need for SYSCONF_DIR = /usr/local/etc comes from the configure of the libvirt . In fact I see in the configure file the statement : sysconfigdir = '${prefix}/etc . Any idea how to fix that . I am using the installed libvirt . did not rebuild it . thanks Zvi Dubitzky Virtualization and System Architecture Email:dubi@il.ibm.com IBM Haifa Research Laboratory Phone: +972-4-8296182 Haifa, 31905, ISRAEL

2 1

[libvirt] checkpoint patches of netcf integration for review/guidance
by laine＠laine.org 03 Apr '09

03 Apr '09

I've gone through the first two steps of danpb's "Guide to Adding New libvirt APIs", and thought this would be a good time to send a copy of my work to the list to make sure I'm going in the right direction. Now is (yet another) good time to tell me "You're doing it wrong!". Basically, I've defined the public api in libvirt.h (actually libvirt.h.in - it's a real pain to have generated files under source control - it almost led me to mistakenly lose my modifications a couple times after running autogen, until I actually looked in the directory containing the file and saw the *.in file), done all the toplevel functions in libvirt.c, and whatever ancillary definitions and small functions were needed by them. In a 3rd patch, I also added stuff to configure.in that detects the presence of libnetcf and 1) turns on WITH_NETCF in config.h and 2) adds -lnetcf to LDFLAGS. I noticed that some other similar items have been added to configure.in by peppering little changes in several spots throughout the file; I preferred adding all my stuff in one place to make it easier to follow (and less likely to cause merge conflicts). So far this has been a *lot* of cut-n-paste, which makes me a bit uneasy (both because of the lesser problem that it almost always leads to errors caused by missing bits and pieces that need modification after the paste, and the greater problem that using this method may indicate I'm operating mechanically, without having adequate understanding of what I'm trying to do).

2 6

[libvirt] PATCH: update the XML domain RelaxNG schemas
by Daniel Veillard 02 Apr '09

02 Apr '09

pritesh raised the issue on IRC, so I checked the schemas against the current parsing routines and found a few missing items, I also sorted the device lice to match the enum sequence in the C file. One thing missing and still TODO is the interface definition block, the C parser accepts the "server", "client" and "mcast" types but the RNG doesn't list them in the choice for "interface" Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel(a)veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/

2 2

[libvirt] PATCH: first patch to update the architecture documentation
by Daniel Veillard 02 Apr '09

02 Apr '09

Relatively small update done in the train yesterday, currently this just updates the project description, makes a spearate page for goals and terminology. I intent to continue to revamp the architecture pages with an user view of the architecture, presenting the library/daemon dichotomy, and then a separate page more on the driver internals. Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel(a)veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/

2 2

[libvirt] PATCH: Fix 2 build bugs on mingw
by Daniel P. Berrange 02 Apr '09

02 Apr '09

The Mingw platform lacks readlink(), so we stub out this method on that platform. The plain write() implementation of safezero() was not actually doing anything with the 'offset' arg. This makes it seek to the offset location before writing data. The mmap implementation of safezero() was also not quite right, truncating to len, so if offset was non-zero, it would not be large enough. Daniel Index: configure.in =================================================================== RCS file: /data/cvs/libvirt/configure.in,v retrieving revision 1.211 diff -u -p -r1.211 configure.in --- configure.in 1 Apr 2009 10:40:38 -0000 1.211 +++ configure.in 1 Apr 2009 15:53:35 -0000 @@ -72,7 +72,7 @@ dnl Use --disable-largefile if you don't AC_SYS_LARGEFILE dnl Availability of various common functions (non-fatal if missing). -AC_CHECK_FUNCS([cfmakeraw regexec uname sched_getaffinity getuid getgid posix_fallocate mmap]) +AC_CHECK_FUNCS([cfmakeraw regexec uname sched_getaffinity getuid getgid posix_fallocate mmap readlink]) dnl Availability of various not common threadsafe functions AC_CHECK_FUNCS([strerror_r strtok_r getmntent_r getgrnam_r getpwuid_r]) Index: src/util.c =================================================================== RCS file: /data/cvs/libvirt/src/util.c,v retrieving revision 1.98 diff -u -p -r1.98 util.c --- src/util.c 1 Apr 2009 10:26:22 -0000 1.98 +++ src/util.c 1 Apr 2009 15:53:35 -0000 @@ -136,7 +136,7 @@ int safezero(int fd, int flags ATTRIBUTE /* memset wants the mmap'ed file to be present on disk so create a * sparse file */ - r = ftruncate(fd, len); + r = ftruncate(fd, offset + len); if (r < 0) return -errno; @@ -158,6 +158,9 @@ int safezero(int fd, int flags ATTRIBUTE char *buf; unsigned long long remain, bytes; + if (lseek(fd, offset, SEEK_SET) < 0) + return errno; + /* Split up the write in small chunks so as not to allocate lots of RAM */ remain = len; bytes = 1024 * 1024; @@ -949,6 +952,7 @@ int virFileLinkPointsTo(const char *chec int virFileResolveLink(const char *linkpath, char **resultpath) { +#ifdef HAVE_READLINK struct stat st; char *buf; int n; @@ -981,6 +985,11 @@ int virFileResolveLink(const char *linkp *resultpath = buf; return 0; +#else + if (!(*resultpath = strdup(linkpath))) + return -ENOMEM; + return 0; +#endif } -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|

2 1

[libvirt] existing bridge and no iptable rules
by Markus 02 Apr '09

02 Apr '09

hi, i try to setup libvirt with an existing network setup (bridge with NO physical device, routes and iptables are already configured, dhcp named ..) . this bridge should be available for the libvirt domains. now the problem: every configuration i tried ends in iptable rules beeing created which mess with my network setup (e.g. i try to route vpn traffic from a guest to another network outside) is there a way of defining a virtual network / network source / bridge for domains that takes an existing bridge and does no setup ( ip, iptables, .. )? thanks, markus

1 0