kvm kvm-agent

簡介：libvirt 使用QEMU agent，就是運行在Guest OS裏面的一個小服務。這個服務負責hypervisor和Guest之間進行通信的。Hypervisor使用這個通道去獲取guest OS的信息或執行命令。這個通道的協議叫做Qemu Machine Protocol. 比如，libvirt使用agent去獲取網絡和文件系統的詳細信息。它們是通過virtio-serial或者通過isa-serial通道，又叫做org.qemu.guest_agent.0。 在hypervisior服務器這邊也會創建一個文件，在/var/lib/libvirt/qemu/channel/target/.

(1)我們在Guest OS中安裝客戶端

$ sudo yum install qemu-guest-agent

(2)然後我們重新啟動我們的Guest-OS,查看信息,是否為運行狀態 。

systemctl status qemu-geust-agent

（3）第二步如果為運行狀態，我們在hypervisor上執行查詢信息，進行檢驗。

$ sudo virsh qemu-agent-command centos7.0 ‘{"execute": "guest-info"}‘ --pretty

{
  "return": {
    "version": "2.8.0",
    "supported_commands": [
      {
        "enabled": true,
        "name": "guest-sync-delimited",
        "success-response": true
      },
      {
        "enabled": true,
        "name": "guest-sync",
        "success-response": true
      },
      {
        "enabled": true,
        "name": "guest-suspend-ram",
        "success-response": false
      },
      {
        "enabled": true,
        "name": "guest-suspend-hybrid",
        "success-response": false
      },
 

windows客戶端這裏不再詳述。詳見鏈接地址：https://fedoraproject.org/wiki/Windows_Virtio_Drivers.

二. 資源收集

（1）獲取hypervisor CPU的利用率

root@kvm:~# virsh nodecpustats --percent
usage: 0.0%
user: 0.0%
system: 0.0%
idle: 100.0%
iowait: 0.0%

（2）獲取 hypervisor 內存的利用率

root@kvm:~# virsh nodememstats
total : 131918328 KiB
free : 103633700 KiB
buffers: 195532 KiB
cached : 25874840 KiB
 

（3）檢查KVM的實例狀態

root@kvm:~# virsh domstate kvm1
running

（4）獲取分配給KVM實例的CPU數量

root@kvm:~# virsh vcpucount --current kvm1 --live
1

（5）收集Guest虛擬CPU的詳細信息

root@kvm:~# virsh vcpuinfo kvm1
VCPU: 0
CPU: 29
State: running
CPU time: 118.8s
CPU Affinity: yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

（6）獲取關於虛擬VM CPU的timer信息

root@kvm:~# virsh cpu-stats --total kvm1
Total:
cpu_time 175.003045493 seconds
user_time 2.610000000 seconds
system_time 7.510000000 seconds

（7）獲取關於vm的常規信息。

root@kvm:~# virsh dominfo kvm1
Id: 30
Name: kvm1
UUID: bd167199-c1c4-de7e-4996-43a7f197e565
OS Type: hvm
State: running
CPU(s): 1
CPU time: 175.6s
Max memory: 1048576 KiB
Used memory: 1048576 KiB
Persistent: yes
Autostart: disable
Managed save: no
Security model: none
Security DOI: 0

（8）獲取MV的內存利用率

root@kvm:~# virsh dommemstat --live kvm1
actual 1048576
swap_in 0
rss 252684

（9）獲取KVM實例關聯的塊設備信息

root@kvm:~# virsh domblklist kvm1
Target Source
------------------------------------------------
hda /var/lib/libvirt/images/kvm1.img

（10）獲取塊設備信息的大小

root@kvm:~# virsh domblkinfo --device hda kvm1
Capacity: 8589934592
Allocation: 2012381184
Physical: 2012381184

（11）獲取KVM實例關聯的塊設備錯誤 信息

root@kvm:~# virsh domblkerror kvm1
No errors found

（12）查看KVM實例的塊設備統計信息

root@kvm:~# virsh domblkstat --device hda --human kvm1
Device: hda
number of read operations: 42053
number of bytes read: 106145280
number of write operations: 10648
number of bytes written: 96768000
number of flush operations: 4044
total duration of reads (ns): 833974071
total duration of writes (ns): 1180545967
total duration of flushes (ns): 3458623200

（13）獲取虛擬機的進程信息

root@kvm:~# pgrep -lfa kvm1
32332 /usr/bin/qemu-system-x86_64 -name kvm1 -S -machine pc-            i440fx-trusty,accel=kvm,usb=off -m 1024 -realtime mlock=off -smp    1,sockets=1,cores=1,threads=1 -uuid bd167199-c1c4-de7e-4996-43a7f197e565 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/kvm1.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/libvirt/images/kvm1.img,if=none,id=drive-ide0-0-0,format=raw -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=24,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:55:9b:d6,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -vnc 146.20.141.158:0 -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4

QEMU guest agent和資源的收集