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" 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
