On Tue, May 13, 2014 at 2:08 PM, Kevin Wolf <kw...@redhat.com> wrote: > Am 13.05.2014 um 10:20 hat Shehbaz Jaffer geschrieben: >> Hi, >> >> Could anyone please give me the command to do live-migration to to a >> file? I have tried searching on QEMU Wiki but all the articles that I >> have come across point to snapshotting the disk, and not the entire VM >> to a file. > > In the HMP monitor: migrate "exec:cat > /tmp/vmstate" > Thanks, It worked.
For others who want to do the same please note: We can load the vmstate saved earlier appending: -incoming "exec:cat /tmp/vmstate" to the command while launching the new VM. > Kevin > >> Appreciate your help. >> >> Thanks, >> Shehbaz >> >> On Sat, Apr 19, 2014 at 11:07 PM, Shehbaz Jaffer >> <shehbazjaffer...@gmail.com> wrote: >> > Thankyou for your reply. Live migration does seem like an interesting >> > option >> > to explore. I will look into it and get back if I get stuck. >> > >> > >> > On Wed, Apr 16, 2014 at 6:16 PM, Kevin Wolf <kw...@redhat.com> wrote: >> >> >> >> Am 15.04.2014 um 16:55 hat Shehbaz Jaffer geschrieben: >> >> > Thankyou for your reply. I do not face the error using qemu.1.7.1 >> >> > version. >> >> > >> >> > 1 quick question: >> >> > >> >> > I want to create a qcow2 image file after my VM has completed booting; >> >> > i.e., >> >> > when I boot from this new snapshot, I should directly get to my VMs >> >> > login >> >> > prompt. How can i create such a qcow2 snapshot? >> >> > >> >> > I tried stopped the VM using QMP after the VM had completed booting, and >> >> > then >> >> > using host CLI to create a qcow2 image : >> >> > >> >> > qemu-img create -b ubuntu.qcow2 -f qcow2 newsnap.qcow2 >> >> > >> >> > This created a new qcow2 file - newsnap.qcow2 on top of ubuntu.qcow2, >> >> > however >> >> > when I boot using newsnap.qcow2, It takes me again through the complete >> >> > boot >> >> > process - till the login prompt. >> >> > >> >> > Is there a way to create the qcow2 snapshot after VM has completed >> >> > booting? >> >> >> >> The reason for this is that you only create a snapshot of the disk this >> >> way, not of the VM state (i.e. RAM contents, device states, etc.) >> >> >> >> The most convenient way when you're using qemu directly is probably >> >> using internal snapshots. This is what the savevm/loadvm HMP commands >> >> provide (not sure if there is a QMP equivalent); you can also use the >> >> -loadvm command line parameter to start a VM from a snapshot. >> >> >> >> Another option is that you take an external snapshot in a new qcow2 file >> >> like you did, but you additionally do a live migration into a file. When >> >> restarting the VM, you need to use the -incoming option and feed that >> >> file back to qemu. As this is a bit more cumbersome, this is probably >> >> more an option for management tools than for manual use. >> >> >> >> Kevin >> > >> > >> > >> > >> > -- >> > Shehbaz Jaffer >> > MTS | Advanced Technology Group | NetApp >> >> >> >> -- >> Shehbaz Jaffer >> MTS | Advanced Technology Group | NetApp -- Shehbaz Jaffer MTS | Advanced Technology Group | NetApp
