libvirt-qemu-restore-hook

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1、Libvirthooks–qemurestorehongming2015.1.261Libvirthooks–qemurestore●Bug1142693-[RFE]AddaqemuresumehookthatisabletopreprocessthedomainXML●Themin_guaranteechange(ignore->fail)affectslongrunningVMs.WecanworkaroundthisbymakingsuretheoffendingelementisremovedfromtheXMLduringmigration

2、orresume.Currentlyonlymigrationdestinationallowsustodothat,butifaVMisnevermigrated,thensuspendedandresumedonhostwithnewenoughlibvirt-itwillfailtostart.2Libvirthooks–qemurestore●suspend->resume●Temporarilysavingitsmemorystate●save->restore●Savingitsmemorystatetoafile●managedsave

3、->start●Whenthevirshstartcommandisnextrunforthedomain,itwillautomaticallybestartedfromthissavedstate.3Qemurestorehook-executionsave->restore4Qemurestorehook-executionmanagedsave->start5Qemurestorehook-arguments●/etc/libvirt/hooks/qemuguest_namerestorebegin-●Arguments●Objectname

4、:qemuguestname●Operation:restore●Sub-operation:begin●Extraargument:-6Qemuhook-arguments./src/util/virhook.c7Qemurestorehook-inputandoutput●Input:domainXMLsenttostandardinputofthescript●Output:thescriptactsasafilterandissupposedtomodifythedomainXMLandprintitoutonitsstandardoutpu

5、t●EmptyoutputisidenticaltocopyingtheinputXMLwithoutchangingit8Qemurestorehook-execution●Restoringasavedimage●virshsave->virshrestore●Automaticallyrestoringamanagedsavedomain●virshmanagedsave->virshstart9Libvirthooks–qemurestore10Libvirthooks–qemurestore11Q&A12