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? -- Shehbaz On Tue, Apr 15, 2014 at 1:37 PM, Dr. David Alan Gilbert <dgilb...@redhat.com > wrote: > * Shehbaz Jaffer (shehbazjaffer...@gmail.com) wrote: > > Hi, > > > > I am running a Ubuntu 12.04 guest VM that I created using vm-builder on a > > Ubuntu 12.04 Operating System. I am using qemu-2.0.0-rc0 version. I want > to > > boot from a saved snapshot instance of the guest VM, so I created a > > snapshot using the Qemu Monitor as follows: > > Can you try something newer than -rc0; I remember there was a seg that > looked > similar to this on migration (that I suspect is also in the snapshot path). > > Dave > > > > > <code> > > stop > > savevm new > > cont > > quit > > </code> > > > > I checked if the snapshot had been created, and I could see the snapshot > > for the qcow2 file: > > > > :~/qemu-2.0.0-rc0$ ./qemu-img snapshot -l ~/ubuntu-kvm/ubuntu.qcow2 > > Snapshot list: > > ID TAG VM SIZE DATE VM CLOCK > > 1 0 2014-04-14 17:25:39 00:00:01.100 > > 4 new 84M 2014-04-15 10:00:39 00:08:21.657 > > > > However when I try to load the same vm during boot, I get the following > bt: > > > > ~/qemu-2.0.0-rc0$ gdb ./x86_64-softmmu/qemu-system-x86_64 > > GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04 > > Copyright (C) 2012 Free Software Foundation, Inc. > > License GPLv3+: GNU GPL version 3 or later < > http://gnu.org/licenses/gpl.html > > > > > This is free software: you are free to change and redistribute it. > > There is NO WARRANTY, to the extent permitted by law. Type "show > copying" > > and "show warranty" for details. > > This GDB was configured as "x86_64-linux-gnu". > > For bug reporting instructions, please see: > > <http://bugs.launchpad.net/gdb-linaro/>... > > Reading symbols from > > /home/manan/qemu-2.0.0-rc0/x86_64-softmmu/qemu-system-x86_64...done. > > (gdb) r -hda ~/ubuntu-kvm/ubuntu.qcow2 -loadvm new2 > > Starting program: > > /home/manan/qemu-2.0.0-rc0/x86_64-softmmu/qemu-system-x86_64 -hda > > ~/ubuntu-kvm/ubuntu.qcow2 -loadvm new2 > > [Thread debugging using libthread_db enabled] > > Using host libthread_db library > "/lib/x86_64-linux-gnu/libthread_db.so.1". > > [New Thread 0x7fffedf07700 (LWP 4213)] > > [New Thread 0x7fffed323700 (LWP 4214)] > > > > Program received signal SIGSEGV, Segmentation fault. > > 0x00007ffff5751fb6 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 > > (gdb) bt > > #0 0x00007ffff5751fb6 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 > > #1 0x00007ffff7e07ec9 in tlb_flush (cpu=<optimized out>, > > flush_global=<optimized out>) > > at /usr/include/x86_64-linux-gnu/bits/string3.h:85 > > #2 0x00007ffff7e0ca2c in cpu_common_post_load (opaque=<optimized out>, > > version_id=<optimized out>) > > at /home/manan/qemu-2.0.0-rc0/exec.c:423 > > #3 0x00007ffff7e00d2d in vmstate_load_state (f=0x7ffff8ad1400, > > vmsd=0x7ffff82c9660, opaque=0x7ffff89715a0, version_id=1) > > at vmstate.c:87 > > #4 0x00007ffff7e719d7 in vmstate_load (version_id=<optimized out>, > > se=0x7ffff8982210, f=0x7ffff8ad1400) > > at /home/manan/qemu-2.0.0-rc0/savevm.c:435 > > #5 qemu_loadvm_state (f=0x7ffff8ad1400) at > > /home/manan/qemu-2.0.0-rc0/savevm.c:805 > > #6 0x00007ffff7e7227a in load_vmstate (name=<optimized out>) at > > /home/manan/qemu-2.0.0-rc0/savevm.c:1091 > > #7 0x00007ffff7c5ab5c in main (argc=<optimized out>, argv=<optimized > out>, > > envp=<optimized out>) at vl.c:4457 > > (gdb) > > > > I even tried the command > > > > guest-fsfreeze-freeze as mentioned here: > > > > http://wiki.qemu.org/Features/Snapshots > > > > But the Qemu Monitor says the command doesnt exist. Do we need to issue a > > command to flush the tlb buffer? Please advise. > > > > -- > > Shehbaz Jaffer > -- > Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK >
