July 2008 - Devel - libvirt List Archives

[libvirt] Java bindings
by Alejandro Berna Juan 04 Sep '08

04 Sep '08

Hi all, I'm Alejandro Berna from i2CAT (a non-profit foundation in Barcelona, Spain, www.i2cat.net) I'm collaborating in a Europena project called Federica ( www.fp7-*federica*.eu ). One of the branch of this project is to permit virtualization of different hosts in the Federica test-bed. We are doing some studies about the different management interfaces of Xen. Our objective is to create a software remote client for Xen tool (in java if it's possible) that can do (general functionalities): - Create virtual machines assigning virtual interfaces. - Permit choose the OS assigned to this virtual machine - Install new applications to be tested in the virtual machines - Configure a vm to become a router and permit to configure this router as it was a physical router. All these actions have to be performed remotelly. I have not found too much information about libvrt but I think that can be usefull for our achieves. If you agree that with libvrt we can perform these actions, maybe I can build the java bindings for libvrt inside the Federica work. I'm waiting for your opinions, thank you, -- Alejandro Berna Juan alejandro.berna(a)i2cat.net

4 10

[libvirt] [PATCH/RFC]: hostdev passthrough support
by Guido Günther 12 Aug '08

12 Aug '08

Hi, attached is some basic support for host device passthrough. It enables you to passthrough usb devices in qemu/kvm via: <devices> <hostdev type='usb' vendor='0204' product='6025'/> <hostdev type='usb' bus='001' device='007'/> </devices> I didn't implement unplug yet since this needs some modifications to qemu/kvm to be able to identify the correct device to unplug. Does this look reasonable? -- Guido

5 35

[libvirt] default networking issues
by Bryan Kearney 07 Aug '08

07 Aug '08

Need some help about where to look next. I am running a Fedora 9 machine, up to date on the releaed rpms. SELinux is permissive, iptables is stopped. I have followed the instructions for NAT forwarding [1]. When I launch a guest in virt manager it uses the default network, and is assigned an IP address in the 192.168.122 space. It can do dns resolution, but can not wget a known website (www.cnn.com) From my host machine, I can ssh into the guest. Where is the next place I should look. Is the fact that I am running in a corporate network causing me issues? Thanks! -- bk [1] http://wiki.libvirt.org/page/Networking#NAT_forwarding_.28aka_.22virtual_ne…

5 5

[libvirt] [PATCH] storage pool discovery
by David Lively 06 Aug '08

06 Aug '08

Hi - The attached patch implements virConnectDiscoverStoragePools mostly as specified by Daniel Berrange in: http://www.redhat.com/archives/libvir-list/2008-February/msg00107.html Daniel wasn't happy with the interface for this function because it wasn't sufficiently general, so it currently doesn't exist. I've attempted to generalize his proposed interface by changing the "hostname" argument to a "srcSpec" argument, which is intended to be a XML storage pool <source> element. Note that srcSpec is not necessary for some (local) pool types. For example, to discover existing LVM volume groups, there's no need to specify a source: virsh # pool-discover logical While discovering nfs shares requires a <source> document to specify the host to query: virsh # pool-discover netfs "<source><host name='share' /></source>" Currently (i.e., in this patch) I've implemented discovery support only for the "logical" and "netfs" pools. I plan on covering the other types once we've agreed upon the API. While this patch is rather large, the vast majority of it is "generic" (not specific to any particular type of storage pool) code, which I mostly took from Daniel's submission. I could easily break the storage-pool-type-specific pieces into separate patches, but those changes are already segregated into the appropriate storage_backend_ files. * Known Issues * I made the virsh interface take a XML string rather than a filename. I found it convenient, but AFAIK the rest of the commands that take XML take it from a file, so perhaps that should be changed (just let me know what you'd prefer). I realize the description of srcSpec is kind of fuzzy. For instance, for netfs discovery, the <source> must have a <host> element (to specify the host to query), but shouldn't have a <dir> element since the exported dirs are exactly what we're trying to discover in this case. So this really needs to be documented accurately for each storage pool type. (Where?) Finally, there's an underspecification issue. The XML pool descriptions returned are supposed to be usable as valid input to virStoragePoolDefineXML. But these descriptions include some data (pool name, target path) that isn't specified by the discover input or the discovered resources. For now, I'm making up a somewhat arbitrary pool name (logical: VolGroup name, netfs: last component of export path). And I don't even specify <target><path> in the "netfs" discovery output (which means it's not valid input to virStoragePoolDefineXML until a target path is added). Dave

4 14

[libvirt] fully virtualized xen guest question
by Christoph Höger 01 Aug '08

01 Aug '08

Hi, I am running XEN on an debian etch. For clustering purposes I wanted to boot fedora as virtual machine. That works (except for nfs mounts) fine using the paravortualization features. But fully virtulalized guests do not even boot, I do not get any sensefull error message, my config file looks like: <domain type='xen'> <name>werewolf</name> <os> <type>hvm</type> <loader>/usr/lib/xen-3.0.3-1/boot/hvmloader</loader> <kernel>/data/virtual/kernel/kvm1/vmlinuz-2.6.18-6-amd64</kernel> <initrd>/data/virtual/kernel/kvm1/initrd.img-2.6.18-6-amd64</initrd> <cmdline>root=/dev/hda1</cmdline> </os> <memory>524M</memory> <vcpu>1</vcpu> <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file'> <source file='/tmp/werewolf.img.plb13810'/> <target dev='hda1' bus='xen'/> </disk> <interface type='bridge'> <source bridge='virbr1'/> </interface> </devices> <features> <acpi/> </features> </domain> <domain type='xen'> <name>werewolf</name> <os> <type>hvm</type> <loader>/usr/lib/xen-3.0.3-1/boot/hvmloader</loader> <kernel>/data/virtual/kernel/kvm1/vmlinuz-2.6.18-6-amd64</kernel> <initrd>/data/virtual/kernel/kvm1/initrd.img-2.6.18-6-amd64</initrd> <cmdline>root=/dev/hda1</cmdline> </os> <memory>524M</memory> <vcpu>1</vcpu> <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file'> <source file='/tmp/werewolf.img.plb13810'/> <target dev='hda1' bus='xen'/> </disk> <interface type='bridge'> <source bridge='virbr1'/> </interface> </devices> <features> <acpi/> </features> </domain> all I get when tryin virsh create is: xend_post: error from xen daemon: (xend.err "Error creating domain: (0, 'Error')") Whats wrong?

2 2

[libvirt] [PATCH] virsh edit, virsh net-edit, virsh pool-edit
by Richard W.M. Jones 01 Aug '08

01 Aug '08

This implements 'virsh edit', 'virsh net-edit' and 'virsh pool-edit' commands. Previous discussion of this patch was in this thread: https://www.redhat.com/archives/libvir-list/2008-July/thread.html#00434 Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://et.redhat.com/~rjones/virt-df/

2 6

[libvirt] PATCH: Support container XML enhancements
by Daniel P. Berrange 01 Aug '08

01 Aug '08

This is something I previously submitted as part of one of the LXC patches, but I figure it makes sense on its own, since OpenVZ needs this now too. This adds two new XML elements to the domain XML format: - An <init> block within <os> allowing specification of the path for a binary to run when starting the container - aka 'init' by any other name. First we also specify that all containers will use an OS type of 'exe' - as in executable - the container equivalent of 'hvm' <os> <type>exe</type> <init>/sbin/init</init> </os> - An <filesystem> element for specifying how the container's filesystem is to be provided. This can actually be useful for full-machine virt too such as KVM which have host filesystem pass-through. There are various ways to configure it: eg to use '/some/directory' as the root filesystem for a container <filesystem type='mount'> <source dir='/some/directory'/> <target dir='/'/> </filesystem> eg to use a template called 'fedora9web' as the root filesystem for a container <filesystem type='template'> <source name='fedora9web'/> <target dir='/'/> </filesystem> eg to use a file containing a filesystem as the root filesystem <filesystem type='file'> <source file='/some/file.img'/> <target dir='/'/> </filesystem> eg to use a disk partition or other block device (eg LVM) containing a filesystem as the root filesystem <filesystem type='block'> <source dev='/dev/VolGroup00/Fedora9Web'/> <target dir='/'/> </filesystem> If setting the root filesystem, the target path will be '/', some container based virt allows the host OS root filesystem to be used in the guest, and merely specify additive mounts at specific locations, eg to override just /home within a container <filesystem type='mount'> <source dir='/some/directory'/> <target dir='/home'/> </filesystem> I believe this should satisfy all the OpenVZ, LXC and Linux-VServer drivers' requirements around filesystems Daniel diff -r 5614da5fe9ef src/domain_conf.c --- a/src/domain_conf.c Fri Jul 25 15:38:46 2008 +0100 +++ b/src/domain_conf.c Tue Jul 29 16:03:38 2008 +0100 @@ -86,6 +86,12 @@ "virtio", "xen") +VIR_ENUM_IMPL(virDomainFS, VIR_DOMAIN_FS_TYPE_LAST, + "mount", + "block", + "file", + "template") + VIR_ENUM_IMPL(virDomainNet, VIR_DOMAIN_NET_TYPE_LAST, "user", "ethernet", @@ -234,6 +240,18 @@ VIR_FREE(def->driverType); virDomainDiskDefFree(def->next); + VIR_FREE(def); +} + +void virDomainFSDefFree(virDomainFSDefPtr def) +{ + if (!def) + return; + + VIR_FREE(def->src); + VIR_FREE(def->dst); + + virDomainFSDefFree(def->next); VIR_FREE(def); } @@ -345,6 +363,7 @@ virDomainGraphicsDefFree(def->graphics); virDomainInputDefFree(def->inputs); virDomainDiskDefFree(def->disks); + virDomainFSDefFree(def->fss); virDomainNetDefFree(def->nets); virDomainChrDefFree(def->serials); virDomainChrDefFree(def->parallels); @@ -355,6 +374,7 @@ VIR_FREE(def->os.type); VIR_FREE(def->os.arch); VIR_FREE(def->os.machine); + VIR_FREE(def->os.init); VIR_FREE(def->os.kernel); VIR_FREE(def->os.initrd); VIR_FREE(def->os.cmdline); @@ -620,6 +640,89 @@ error: virDomainDiskDefFree(def); + def = NULL; + goto cleanup; +} + + +/* Parse the XML definition for a disk + * @param node XML nodeset to parse for disk definition + */ +static virDomainFSDefPtr +virDomainFSDefParseXML(virConnectPtr conn, + xmlNodePtr node) { + virDomainFSDefPtr def; + xmlNodePtr cur; + char *type = NULL; + char *source = NULL; + char *target = NULL; + + if (VIR_ALLOC(def) < 0) { + virDomainReportError(conn, VIR_ERR_NO_MEMORY, NULL); + return NULL; + } + + type = virXMLPropString(node, "type"); + if (type) { + if ((def->type = virDomainFSTypeFromString(type)) < 0) { + virDomainReportError(conn, VIR_ERR_INTERNAL_ERROR, + _("unknown filesystem type '%s'"), type); + goto error; + } + } else { + def->type = VIR_DOMAIN_FS_TYPE_MOUNT; + } + + cur = node->children; + while (cur != NULL) { + if (cur->type == XML_ELEMENT_NODE) { + if ((source == NULL) && + (xmlStrEqual(cur->name, BAD_CAST "source"))) { + + if (def->type == VIR_DOMAIN_FS_TYPE_MOUNT) + source = virXMLPropString(cur, "dir"); + else if (def->type == VIR_DOMAIN_FS_TYPE_FILE) + source = virXMLPropString(cur, "file"); + else if (def->type == VIR_DOMAIN_FS_TYPE_BLOCK) + source = virXMLPropString(cur, "dev"); + else if (def->type == VIR_DOMAIN_FS_TYPE_TEMPLATE) + source = virXMLPropString(cur, "name"); + } else if ((target == NULL) && + (xmlStrEqual(cur->name, BAD_CAST "target"))) { + target = virXMLPropString(cur, "dir"); + } else if (xmlStrEqual(cur->name, BAD_CAST "readonly")) { + def->readonly = 1; + } + } + cur = cur->next; + } + + if (source == NULL) { + virDomainReportError(conn, VIR_ERR_NO_SOURCE, + target ? "%s" : NULL, target); + goto error; + } + + if (target == NULL) { + virDomainReportError(conn, VIR_ERR_NO_TARGET, + source ? "%s" : NULL, source); + goto error; + } + + def->src = source; + source = NULL; + def->dst = target; + target = NULL; + +cleanup: + VIR_FREE(type); + VIR_FREE(target); + VIR_FREE(source); + + return def; + + error: + virDomainFSDefFree(def); def = NULL; goto cleanup; } @@ -1351,6 +1454,10 @@ dev->type = VIR_DOMAIN_DEVICE_DISK; if (!(dev->data.disk = virDomainDiskDefParseXML(conn, node))) goto error; + } else if (xmlStrEqual(node->name, BAD_CAST "filesystem")) { + dev->type = VIR_DOMAIN_DEVICE_FS; + if (!(dev->data.fs = virDomainFSDefParseXML(conn, node))) + goto error; } else if (xmlStrEqual(node->name, BAD_CAST "interface")) { dev->type = VIR_DOMAIN_DEVICE_NET; if (!(dev->data.net = virDomainNetDefParseXML(conn, node))) @@ -1560,7 +1667,21 @@ } } - if (!def->os.bootloader) { + /* + * Booting options for different OS types.... + * + * - A bootloader (and optional kernel+initrd) (xen) + * - A kernel + initrd (xen) + * - A boot device (and optional kernel+initrd) (hvm) + * - An init script (exe) + */ + + if (STREQ(def->os.type, "exe")) { + def->os.init = virXPathString(conn, "string(./os/init[1])", ctxt); + } + + if (STREQ(def->os.type, "xen") || + STREQ(def->os.type, "hvm")) { def->os.kernel = virXPathString(conn, "string(./os/kernel[1])", ctxt); def->os.initrd = virXPathString(conn, "string(./os/initrd[1])", ctxt); def->os.cmdline = virXPathString(conn, "string(./os/cmdline[1])", ctxt); @@ -1610,12 +1731,9 @@ def->os.type, def->os.arch, type); - if (!emulator) { - virDomainReportError(conn, VIR_ERR_INTERNAL_ERROR, - "%s", _("unsupported guest type")); - goto error; - } - if (!(def->emulator = strdup(emulator))) { + + if (emulator && + !(def->emulator = strdup(emulator))) { virDomainReportError(conn, VIR_ERR_NO_MEMORY, NULL); goto error; } @@ -1648,6 +1766,23 @@ ptr = ptr->next; } } + } + VIR_FREE(nodes); + + /* analysis of the filesystems */ + if ((n = virXPathNodeSet(conn, "./devices/filesystem", ctxt, &nodes)) < 0) { + virDomainReportError(conn, VIR_ERR_INTERNAL_ERROR, + "%s", _("cannot extract filesystem devices")); + goto error; + } + for (i = n - 1 ; i >= 0 ; i--) { + virDomainFSDefPtr fs = virDomainFSDefParseXML(conn, + nodes[i]); + if (!fs) + goto error; + + fs->next = def->fss; + def->fss = fs; } VIR_FREE(nodes); @@ -2202,6 +2337,57 @@ } static int +virDomainFSDefFormat(virConnectPtr conn, + virBufferPtr buf, + virDomainFSDefPtr def) +{ + const char *type = virDomainFSTypeToString(def->type); + + if (!type) { + virDomainReportError(conn, VIR_ERR_INTERNAL_ERROR, + _("unexpected filesystem type %d"), def->type); + return -1; + } + + virBufferVSprintf(buf, + " <filesystem type='%s'>\n", + type); + + if (def->src) { + switch (def->type) { + case VIR_DOMAIN_FS_TYPE_MOUNT: + virBufferEscapeString(buf, " <source dir='%s'/>\n", + def->src); + break; + + case VIR_DOMAIN_FS_TYPE_BLOCK: + virBufferEscapeString(buf, " <source dev='%s'/>\n", + def->src); + break; + + case VIR_DOMAIN_FS_TYPE_FILE: + virBufferEscapeString(buf, " <source file='%s'/>\n", + def->src); + break; + + case VIR_DOMAIN_FS_TYPE_TEMPLATE: + virBufferEscapeString(buf, " <source name='%s'/>\n", + def->src); + } + } + + virBufferVSprintf(buf, " <target dir='%s'/>\n", + def->dst); + + if (def->readonly) + virBufferAddLit(buf, " <readonly/>\n"); + + virBufferAddLit(buf, " </filesystem>\n"); + + return 0; +} + +static int virDomainNetDefFormat(virConnectPtr conn, virBufferPtr buf, virDomainNetDefPtr def) @@ -2479,6 +2665,7 @@ unsigned char *uuid; char uuidstr[VIR_UUID_STRING_BUFLEN]; virDomainDiskDefPtr disk; + virDomainFSDefPtr fs; virDomainNetDefPtr net; virDomainSoundDefPtr sound; virDomainInputDefPtr input; @@ -2548,6 +2735,9 @@ else virBufferVSprintf(&buf, ">%s</type>\n", def->os.type); + if (def->os.init) + virBufferEscapeString(&buf, " <init>%s</init>\n", + def->os.init); if (def->os.loader) virBufferEscapeString(&buf, " <loader>%s</loader>\n", def->os.loader); @@ -2621,6 +2811,13 @@ if (virDomainDiskDefFormat(conn, &buf, disk) < 0) goto cleanup; disk = disk->next; + } + + fs = def->fss; + while (fs) { + if (virDomainFSDefFormat(conn, &buf, fs) < 0) + goto cleanup; + fs = fs->next; } net = def->nets; diff -r 5614da5fe9ef src/domain_conf.h --- a/src/domain_conf.h Fri Jul 25 15:38:46 2008 +0100 +++ b/src/domain_conf.h Tue Jul 29 16:03:38 2008 +0100 @@ -91,6 +91,28 @@ unsigned int shared : 1; virDomainDiskDefPtr next; +}; + + +/* Two types of disk backends */ +enum virDomainFSType { + VIR_DOMAIN_FS_TYPE_MOUNT, /* Better named 'bind' */ + VIR_DOMAIN_FS_TYPE_BLOCK, + VIR_DOMAIN_FS_TYPE_FILE, + VIR_DOMAIN_FS_TYPE_TEMPLATE, + + VIR_DOMAIN_FS_TYPE_LAST +}; + +typedef struct _virDomainFSDef virDomainFSDef; +typedef virDomainFSDef *virDomainFSDefPtr; +struct _virDomainFSDef { + int type; + char *src; + char *dst; + unsigned int readonly : 1; + + virDomainFSDefPtr next; }; @@ -262,6 +284,7 @@ /* Flags for the 'type' field in next struct */ enum virDomainDeviceType { VIR_DOMAIN_DEVICE_DISK, + VIR_DOMAIN_DEVICE_FS, VIR_DOMAIN_DEVICE_NET, VIR_DOMAIN_DEVICE_INPUT, VIR_DOMAIN_DEVICE_SOUND, @@ -273,6 +296,7 @@ int type; union { virDomainDiskDefPtr disk; + virDomainFSDefPtr fs; virDomainNetDefPtr net; virDomainInputDefPtr input; virDomainSoundDefPtr sound; @@ -318,6 +342,7 @@ char *machine; int nBootDevs; int bootDevs[VIR_DOMAIN_BOOT_LAST]; + char *init; char *kernel; char *initrd; char *cmdline; @@ -357,6 +382,7 @@ virDomainGraphicsDefPtr graphics; virDomainDiskDefPtr disks; + virDomainFSDefPtr fss; virDomainNetDefPtr nets; virDomainInputDefPtr inputs; virDomainSoundDefPtr sounds; @@ -411,6 +437,7 @@ void virDomainGraphicsDefFree(virDomainGraphicsDefPtr def); void virDomainInputDefFree(virDomainInputDefPtr def); void virDomainDiskDefFree(virDomainDiskDefPtr def); +void virDomainFSDefFree(virDomainFSDefPtr def); void virDomainNetDefFree(virDomainNetDefPtr def); void virDomainChrDefFree(virDomainChrDefPtr def); void virDomainSoundDefFree(virDomainSoundDefPtr def); @@ -481,6 +508,7 @@ VIR_ENUM_DECL(virDomainDisk) VIR_ENUM_DECL(virDomainDiskDevice) VIR_ENUM_DECL(virDomainDiskBus) +VIR_ENUM_DECL(virDomainFS) VIR_ENUM_DECL(virDomainNet) VIR_ENUM_DECL(virDomainChr) VIR_ENUM_DECL(virDomainSoundModel) -- |: 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 :|

4 10

[libvirt] [PATCH]: Add carriage returns to qemudLog
by Chris Lalancette 01 Aug '08

01 Aug '08

Since qemudLog just maps to fprintf(stderr), add carriage returns every where it is used, so it's easier on the eyes while debugging. Signed-off-by: Chris Lalancette <clalance(a)redhat.com>

3 2

[libvirt] PATCH: 0/14: Generic XML parsers/formatters for all drivers
by Daniel P. Berrange 01 Aug '08

01 Aug '08

The following series of patchs provide a generic XML parser and formatter for the network and domain XML config formats. They then switch over the test, qemu, Xend and XM drivers to these APIs. The LXC driver is work in progress. Daniel -- |: 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 :|

4 43

[libvirt] [PATCH] Minor doc tweaks
by Charles Duffy 01 Aug '08

01 Aug '08

Per subject; clarifies the distinction between virDomainCreateLinux and virDomainDefineXML+virDomainCreate, and adds documentation for the autoport display attribute.

2 1