mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2025-01-11 07:17:44 +00:00
4201a7ea1c
Each <domainsnapshot> can now contain an optional <memory> element that describes how the VM state was handled, similar to disk snapshots. The new element will always appear in output; for back-compat, an input that lacks the element will assume 'no' or 'internal' according to the domain state. Along with this change, it is now possible to pass <disks> in the XML for an offline snapshot; this also needs to be wired up in a future patch, to make it possible to choose internal vs. external on a per-disk basis for each disk in an offline domain. At that point, using the --disk-only flag for an offline domain will be able to work. For some examples below, remember that qemu supports the following snapshot actions: qemu-img: offline external and internal disk savevm: online internal VM and disk migrate: online external VM transaction: online external disk ===== <domainsnapshot> <memory snapshot='no'/> ... </domainsnapshot> implies that there is no VM state saved (mandatory for offline and disk-only snapshots, not possible otherwise); using qemu-img for offline domains and transaction for online. ===== <domainsnapshot> <memory snapshot='internal'/> ... </domainsnapshot> state is saved inside one of the disks (as in qemu's 'savevm' system checkpoint implementation). If needed in the future, we can also add an attribute pointing out _which_ disk saved the internal state; maybe disk='vda'. ===== <domainsnapshot> <memory snapshot='external' file='/path/to/state'/> ... </domainsnapshot> This is not wired up yet, but future patches will allow this to control a combination of 'virsh save /path/to/state' plus disk snapshots from the same point in time. ===== So for 1.0.1 (and later, as needed), I plan to implement this table of combinations, with '*' designating new code and '+' designating existing code reached through new combinations of xml and/or the existing DISK_ONLY flag: domain memory disk disk-only | result ----------------------------------------- offline omit omit any | memory=no disk=int, via qemu-img offline no omit any |+memory=no disk=int, via qemu-img offline omit/no no any | invalid combination (nothing to snapshot) offline omit/no int any |+memory=no disk=int, via qemu-img offline omit/no ext any |*memory=no disk=ext, via qemu-img offline int/ext any any | invalid combination (no memory to save) online omit omit off | memory=int disk=int, via savevm online omit omit on | memory=no disk=default, via transaction online omit no/ext off | unsupported for now online omit no on | invalid combination (nothing to snapshot) online omit ext on | memory=no disk=ext, via transaction online omit int off |+memory=int disk=int, via savevm online omit int on | unsupported for now online no omit any |+memory=no disk=default, via transaction online no no any | invalid combination (nothing to snapshot) online no int any | unsupported for now online no ext any |+memory=no disk=ext, via transaction online int/ext any on | invalid combination (disk-only vs. memory) online int omit off |+memory=int disk=int, via savevm online int no/ext off | unsupported for now online int int off |+memory=int disk=int, via savevm online ext omit off |*memory=ext disk=default, via migrate+trans online ext no off |+memory=ext disk=no, via migrate online ext int off | unsupported for now online ext ext off |*memory=ext disk=ext, via migrate+transaction * docs/schemas/domainsnapshot.rng (memory): New RNG element. * docs/formatsnapshot.html.in: Document it. * src/conf/snapshot_conf.h (virDomainSnapshotDef): New fields. * src/conf/domain_conf.c (virDomainSnapshotDefFree) (virDomainSnapshotDefParseString, virDomainSnapshotDefFormat): Manage new fields. * tests/domainsnapshotxml2xmltest.c: New test. * tests/domainsnapshotxml2xmlin/*.xml: Update existing tests. * tests/domainsnapshotxml2xmlout/*.xml: Likewise. |
||
|---|---|---|
| .. | ||
| capabilityschemadata | ||
| commanddata | ||
| confdata | ||
| cputestdata | ||
| domainschemadata | ||
| domainsnapshotxml2xmlin | ||
| domainsnapshotxml2xmlout | ||
| interfaceschemadata | ||
| lxcxml2xmldata | ||
| networkxml2argvdata | ||
| networkxml2xmlin | ||
| networkxml2xmlout | ||
| nodedevschemadata | ||
| nodeinfodata | ||
| nwfilterxml2xmlin | ||
| nwfilterxml2xmlout | ||
| qemuhelpdata | ||
| qemuxml2argvdata | ||
| qemuxml2xmloutdata | ||
| qemuxmlnsdata | ||
| sexpr2xmldata | ||
| storagepoolxml2xmlin | ||
| storagepoolxml2xmlout | ||
| storagevolxml2xmlin | ||
| storagevolxml2xmlout | ||
| vmx2xmldata | ||
| xencapsdata | ||
| xmconfigdata | ||
| xml2sexprdata | ||
| xml2vmxdata | ||
| .valgrind.supp | ||
| capabilityschematest | ||
| commandhelper.c | ||
| commandtest.c | ||
| conftest.c | ||
| cpuset | ||
| cputest.c | ||
| define-dev-segfault | ||
| domainschematest | ||
| domainsnapshotschematest | ||
| domainsnapshotxml2xmltest.c | ||
| esxutilstest.c | ||
| eventtest.c | ||
| int-overflow | ||
| interfaceschematest | ||
| interfacexml2xmltest.c | ||
| jsontest.c | ||
| libvirtd-fail | ||
| libvirtd-pool | ||
| libvirtdconftest.c | ||
| lxcxml2xmltest.c | ||
| Makefile.am | ||
| networkschematest | ||
| networkxml2argvtest.c | ||
| networkxml2xmltest.c | ||
| nodedevschematest | ||
| nodedevxml2xmltest.c | ||
| nodeinfotest.c | ||
| nwfilterschematest | ||
| nwfilterxml2xmltest.c | ||
| object-locking.ml | ||
| oomtrace.pl | ||
| openvzutilstest.c | ||
| openvzutilstest.conf | ||
| pkix_asn1_tab.c | ||
| qemuargv2xmltest.c | ||
| qemuhelptest.c | ||
| qemumonitorjsontest.c | ||
| qemumonitortest.c | ||
| qemumonitortestutils.c | ||
| qemumonitortestutils.h | ||
| qemuxml2argvtest.c | ||
| qemuxml2xmltest.c | ||
| qemuxmlnstest.c | ||
| read-bufsiz | ||
| read-non-seekable | ||
| reconnect.c | ||
| schematestutils.sh | ||
| seclabeltest.c | ||
| securityselinuxhelper.c | ||
| securityselinuxtest.c | ||
| sexpr2xmltest.c | ||
| shunloadhelper.c | ||
| shunloadtest.c | ||
| sockettest.c | ||
| ssh.c | ||
| start | ||
| statstest.c | ||
| storagebackendsheepdogtest.c | ||
| storagepoolschematest | ||
| storagepoolxml2xmltest.c | ||
| storagevolschematest | ||
| storagevolxml2xmltest.c | ||
| test_conf.sh | ||
| test-lib.sh | ||
| testutils.c | ||
| testutils.h | ||
| testutilslxc.c | ||
| testutilslxc.h | ||
| testutilsqemu.c | ||
| testutilsqemu.h | ||
| testutilsxen.c | ||
| testutilsxen.h | ||
| utiltest.c | ||
| vcpupin | ||
| viratomictest.c | ||
| virauthconfigtest.c | ||
| virbitmaptest.c | ||
| virbuftest.c | ||
| virdrivermoduletest.c | ||
| virhashdata.h | ||
| virhashtest.c | ||
| virkeyfiletest.c | ||
| virlockspacetest.c | ||
| virnetmessagetest.c | ||
| virnetsockettest.c | ||
| virnettlscontexttest.c | ||
| virsh-all | ||
| virsh-optparse | ||
| virsh-schedinfo | ||
| virsh-synopsis | ||
| virsh-undefine | ||
| virshtest.c | ||
| virt-aa-helper-test | ||
| virtimetest.c | ||
| viruritest.c | ||
| vmx2xmltest.c | ||
| xencapstest.c | ||
| xmconfigtest.c | ||
| xml2sexprtest.c | ||
| xml2vmxtest.c | ||