QEMU installation and launch the VM

--- tags: Virtual Machine --- # QEMU installation and launch the VM ``` $ sudo apt-get install libperl-dev $ sudo apt-get install libgtk2.0-dev $ sudo apt-get install libgtk-3-dev $ sudo apt-get install openvpn $ wget https://download.qemu.org/qemu-3.0.0-rc0.tar.xz $ tar xvJf qemu-3.0.0-rc0.tar.xz $ cd qemu-3.0.0-rc0 $ ./configure --target-list=x86_64-softmmu $ make -j8 ``` [Download Ubuntu 16.04 iso](https://drive.google.com/file/d/0B9au9R9FzSWKUjRZclBXbXB0eEk/view) ``` $ ./qemu-img create -f qcow2 ubuntu1604.qcow2 60G ``` ``` Formatting 'ubuntu1604.qcow2', fmt=qcow2 size=64424509440 cluster_size=65536 lazy_refcounts=off refcount_bits=16 ``` ``` $ ./x86_64-softmmu/qemu-system-x86_64 -cdrom ubuntu-16.04-desktop-amd64.iso ubuntu1604.qcow2 -enable-kvm -m 6G ``` * After installation * Add a bridge (modify /etc/network/interfaces) ``` # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback auto br0 iface br0 inet static bridge_ports enp3s0 bridge_maxwait 0 address 192.168.11.9 netmask 255.255.255.0 gateway 192.168.11.1 dns-nameservers 8.8.8.8 140.96.254.98 auto enp3s0 iface enp3s0 inet static address 0.0.0.0 ``` ``` $ sudo reboot ``` * Perpare set-net.sh ``` #!/bin/sh /usr/sbin/openvpn --mktun --dev tap0 --user `id -un` ifconfig tap0 promisc up brctl addif br0 tap0 ``` ``` $ sudo sh set-net.sh ``` * Perpare run.sh ``` #!/bin/bash sudo ./x86_64-softmmu/qemu-system-x86_64 -drive if=none,id=drive0,cache=none,format=qcow2,file=ubuntu1604.qcow2 \ -device virtio-blk,drive=drive0,scsi=off \ -m 6G -enable-kvm \ -netdev tap,id=tap0,vhost=off \ -device virtio-net-pci,id=net-pci0,netdev=tap0 \ -smp 2 ``` ``` $ sh ./run.sh ``` * In the new VM, modify the /etc/network/interfaces ``` # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback #auto eth0 #iface eth0 inet dhcp auto ens4 iface ens4 inet static address 192.168.11.20 netmask 255.255.255.0 gateway 192.168.11.1 dns-nameservers 8.8.8.8 140.96.254.98 ``` * Reboot your VM and check the network qemu-system-x86_64 --enable-kvm -drive format=raw,file=ubuntu.img,if=virtio -m 2048 -net nic,model=virtio -net user -rtc base=localtime,clock=host -curses ## using QEMU to create and migrate instance create another mv on one of the hosts install qemu ``` sudo apt-get install qemu-kvm qemu virt-manager virt-viewer libvirt-bin ``` prepare set-net.sh ``` #!/bin/sh /usr/sbin/openvpn --mktun --dev tap1 --user `id -un` ifconfig tap1 promisc up brctl addif br0 tap1 ``` prepare run.sh ``` #!/bin/bash sudo qemu-system-x86_64 -drive if=none,id=drive0,cache=none,format=raw,file=ubuntu.img \ -device virtio-blk,drive=drive0,scsi=off \ -m 1G -enable-kvm \ -net tap,ifname=tap0 -net nic,model=virtio,vlan=0,macaddr=ae:ae:00:00:00:24\ -smp 1 \ -curses ``` stuck at boot -use ctrl+alt+2 or Esc+2 create a backup host using the same image and add to the script to open a listening port ``` -incoming tcp:0:4444 ``` on the first host enter the qemu monitor(ctrl+alt +2 or Esc+2) ``` migrate -d tcp:192.168.8.3:4444 ``` ## using virsh #### create share storage(NFS) using virsh to create instance ``` virt-install \ -n vm1\ --description "mv for migration" \ --os-type=Linux \ --os-variant=ubuntu16.04 \ --ram=1024 --vcpus=1 --disk path=/home/ting/nfsfolder/ubuntu.img,bus=virtio,size=1,cache=none \ --graphics none --cdrom /home/ting/nfsfolder/ubuntu-16.04.5-server-amd64.iso \ --network bridge:br0 ``` using virsh to migrate instance ##### inport a running vm create a xml file for the existing vm and then import and define the vm ``` $ cat > demo.args <<EOF LC_ALL=C PATH=/bin HOME=/home/test USER=test \ LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 \ -nographic -monitor pty -no-acpi -boot c -hda \ /dev/HostVG/QEMUGuest1 -net none -serial none \ -parallel none -usb EOF ``` ``` $ virsh domxml-from-native qemu-argv demo.args <domain type='qemu'> <uuid>00000000-0000-0000-0000-000000000000</uuid> <memory>219136</memory> <currentMemory>219136</currentMemory> <vcpu>1</vcpu> <os> <type arch='i686' machine='pc'>hvm</type> <boot dev='hd'/> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu</emulator> <disk type='block' device='disk'> <source dev='/dev/HostVG/QEMUGuest1'/> <target dev='hda' bus='ide'/> </disk> </devices> </domain> ```