KVM Live Migration 筆記

Demo影片

https://www.youtube.com/watch?v=lACHT3BaQz8

Environment

• 兩台 Ubuntu 15.04 安裝KVM、vmbuilder、virt-manager
• IP
  1. X.X.X.X
  2. Y.Y.Y.Y

NFS

Server(X.X.X.X)

安裝
sudo apt install nfs-kernel-server nfs-common
分享目錄要權限
sudo chmod -R 777 /var/lib/libvirt/images

/etc/exports

/var/lib/libvirt/images    Y.Y.Y.Y(rw,sync,no_root_squash,no_all_squash)

sudo systemctl nfs-kernel-server restart
sudo systemctl nfs-kernel-server status

Client(Y.Y.Y.Y)

sudo apt install nfs-common
sudo mount -t nfs X.X.X.X:/var/lib/libvirt/images /var/lib/libvirt/images

GUI

sudo virt-manager

Virsh

列出正在執行
sudo virsh list
列出包含關機的
sudo virsh list –all
列出所有snapshot
sudo virsh snapshot-list vm1
刪除snapshot
sudo virsh snapshot-delete vm1 [number]
列出遠端的VM
sudo virsh -c qemu+ssh://Y.Y.Y.Y/system list –all
Migration VM
sudo virsh migrate vm1 qemu+ssh://root@Y.Y.Y.Y/system
sudo virsh migrate –live vm1 qemu+ssh://root@Y.Y.Y.Y/system

DNS

sudo vim /etc/hosts

Y.Y.Y.Y HOSTNAME

SSH(不一定要加)

vim .ssh/authorized_keys
sudo systemctl restart sshd

Code Sample

#!/usr/bin/python
import libvirt
import sys
import time

conn = libvirt.open("qemu:///system")
dconn = libvirt.open("qemu+ssh://Y.Y.Y.Y/system")

while True:
  for id in conn.listDomainsID():
    vm = conn.lookupByID(id)
    # dir(vm) 會列出所有指令
    #print 'vm.name:', vm.name()
    #print vm.info()[0] # 1 start, 3 suspend
    #print "vm.isActive():", vm.isActive()
    print "The Program will run every second..."
    print vm.name(), "is active now"
    if vm.info()[0] == 3:
      print vm.name(), "is suspend now .. start migration"
      new_dom = vm.migrate(dconn, 0, None, None, 0)
      if new_dom == None:
        print vm.name() + " is fail to migrate!"
        break;
      else:
        new_dom.resume()
        print vm.name() + " was migrated successfully!"
        break;
    
    time.sleep(1)
    # for test
    #i = raw_input("Press Enter To Stop")
    #if not i:
      #break

dconn.close()
conn.close()