On Migration of KVM
Jul 19, 2015
Technology
Migration
First create the qemu based vm:
$ pwd
/media/arch/home/juju/img/migration
$ qemu-img create -f qcow2 ubuntu1504.qcow2 100G
$ sudo qemu-system-x86_64 -enable-kvm -m 512 -smp 4 -name ubuntu1504 -monitor stdio -boot c -drive file=/media/arch/home/juju/img/migration/ubuntu1504.qcow2,if=none,id=drive-virtio-disk0,boot=on -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -drive file=/media/arch/home/dash/iso/ubuntu-15.04-server-amd64.iso,if=none,media=cdrom,id=drive-ide0-1-0 -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -device virtio-net-pci,vlan=0,id=net0,mac=52:54:00:13:08:96 -net tap -vnc 127.0.0.1:3
After Installation, startup the vm via(didn’t attach the file):
$ sudo qemu-system-x86_64 -enable-kvm -m 512 -smp 4 -name ubuntu1504 -monitor stdio -boot c -drive file=/media/arch/home/juju/img/migration/ubuntu1504.qcow2,if=none,id=drive-virtio-disk0,boot=on -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -drive if=none,media=cdrom,id=drive-ide0-1-0 -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -device virtio-net-pci,vlan=0,id=net0,mac=52:54:00:13:08:96 -net tap -vnc 127.0.0.1:3
Use top -d 1 for every second refreshed.
The same environment is set as the src machine.
$ qemu-img create -f qcow2 dest.img 20G
$ qemu-system-x86_64 -enable-kvm -m 512 -smp 4 -name ubuntu1504 -monitor stdio -boot c -drive file=/root/Code/dest.img,if=none,id=drive-virtio-disk0,boot=on -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -drive if=none,media=cdrom,id=drive-ide0-1-0 -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -device virtio-net-pci,vlan=0,id=net0,mac=52:54:00:13:08:96 -net tap -vnc 127.0.0.1:8
(qemu) info status
VM status: paused (inmigrate)
Start migration in the src side via:
(qemu) migrate -d -b tcp:192.168.1.18:8888
(qemu) info migrate
In destination machine, you can see the status of the migration.
After migration, the machine stays its top output to the terminal.
Trouble Shooting On Newly Installed Arch
Bug1 virtual network start fail
libvirt via virt-manager virtual network start failed.
Change:
--- libvirt-1.2.16.orig/src/util/virfirewall.c 2015-05-23 08:56:12.000000000 -0400
+++ libvirt-1.2.16.new/src/util/virfirewall.c 2015-06-18 10:01:51.954157612 -0400
@@ -932,14 +932,14 @@
virMutexLock(&ruleLock);
- if (currentBackend == VIR_FIREWALL_BACKEND_AUTOMATIC) {
+// if (currentBackend == VIR_FIREWALL_BACKEND_AUTOMATIC) {
/* a specific backend should have been set when the firewall
* object was created. If not, it means none was found.
*/
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("Failed to initialize a valid firewall backend"));
- goto cleanup;
- }
+// virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+// _("Failed to initialize a valid firewall backend"));
+// goto cleanup;
+// }
if (!firewall || firewall->err == ENOMEM) {
virReportOOMError();
goto cleanup;
For building the libvirt, do following:
# pacman -S abs base-devel
# abs
# cp /var/abs/community/libvirt ~/Code/
# sudo pacman -S lxc libiscsi open-iscsi perl-xml-xpath
# cd ~/Code/libvirt
# makepkg
After makepkg, change the code as in above, tar it again, makepkg with following command makepkg --skipchecksums, this time it will generate a new tar.xz file. Install it via:
# pacman -U libvirt-1.2.17-1-x86_64.pkg.tar.xz
starting network out of memory
Solve it via:
# pacman -S ebtables vde2
# reboot
Start again and this time is OK.
Bridge Configuration
[root@Arch network]# pwd
/etc/systemd/network
[root@Arch network]# cat MyBridge.netdev
[NetDev]
Name=br0
MACAddress=52:54:00:91:e8:11
Kind=bridge
[root@Arch network]# cat MyBridge.network
[Match]
Name=br0
[Network]
DNS=180.76.76.76,114.114.114.114
[Address]
Address=192.168.1.18/24
[Route]
Gateway=192.168.1.1
[root@Arch network]# cat MyEth.network
[Match]
Name=eth0
[Network]
Bridge=br0
Now enable and start the systemd’s networkd service via:
# systemctl enable systemd-networkd.service
# reboot
By this you could enable systemd on ArchLinux.
Easy way:
Simply resolved this issue via:
# pacman -S firewalld
# systemctl enable firewalld
# systemctl start firewalld
# pacman -Syu ebtables dnsmasq