QEMU Guest Agent概述
QEMU Guest Agent是运行在虚拟机内部的一个守护程序（qemu-guest-agent.service），用它来辅助Hypervisor实现对Guest 虚拟机的管理。QEMU为宿主机和虚拟机提供了一个数据通道（channel），这个通道的两端分别是在虚拟机内看到的串口和在宿主机上看到的unix socket文件。宿主机与虚拟机内的qga通讯就扩展了对虚拟机的控制能力，例如在宿主机上获取虚拟机的ip地址等。
libvrit提供了专门的 virDomainQemuAgentCommand API（对应virsh qemu-agent-command命令）来和qemu-guest-agent通讯，另外libvirt内置api也可以支持qga，例如reboot、shutdown等。
1，编辑虚拟机
代码语言：javascript复制virsh edit vm012，宿主机上虚拟机xml添加channel
代码语言：javascript复制<channel type='unix'>
<source mode='bind' path='/var/lib/libvirt/qemu/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
</channel>3，开启虚拟机
代码语言：javascript复制virsh start vm014，Linux虚拟机安装qemu-guest-agent
代码语言：javascript复制yum install qemu-guest-agent
setenforce 0
systemctl restart qemu-guest-agent.service
5，宿主机上测试
代码语言：javascript复制virsh qemu-agent-command vm01 '{"execute":"guest-info"}'
virsh qemu-agent-command vm01 '{"execute":"guest-network-get-interfaces"}'
virsh qemu-agent-command vm01 '{"execute":"guest-ping"}'
virsh reboot --mode agent vm01
virsh shutdown --mode agent vm01
Windows virtio-win iso 下载
https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/latest-virtio/
Windows qemu-ga 安装包下载
https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/latest-qemu-ga/
qemu-guest-agent 修改虚拟机用户密码
1.guest-set-user-password
（1）Windows虚拟机安装qemu-ga-x86_64.msi程序
（2）qemu-agent-command 密码必须是base64编码格式
代码语言：javascript复制[root@kvm-node1 ~]# python
Python 2.7.5 (default, Oct 14 2020, 14:45:30)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-44)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import base64
>>> print base64.b64encode('password')
cGFzc3dvcmQ=（3）关闭虚拟机
代码语言：javascript复制virsh destroy win10（4）修改win10 xml文件添加如下配置
代码语言：javascript复制<channel type='unix'>
<source mode='bind' path='/var/lib/libvirt/qemu/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
</channel>（5）启动虚拟机
代码语言：javascript复制virsh start win10（6）qemu-agent-command命令guest-set-user-password修改密码
virsh qemu-agent-command win10
'{"execute":"guest-set-user-password","arguments":{"username":"admin","password":"cGFzc3dvcmQ=","crypted":false}}' {"return":{}}
2. virsh set-user-password
virsh set-user-password 修改
代码语言：javascript复制virsh set-user-password --domain 6 --user root --password password
Password set successfully for root in 6QEMU Guest Agent 支持指令
- guest-exec
- guest-exec-status
- guest-file-close
- guest-file-flush
- guest-file-open
- guest-file-read
- guest-file-seek
- guest-file-write
- guest-fsfreeze-freeze
- guest-fsfreeze-freeze-list
- guest-fsfreeze-status
- guest-fsfreeze-thaw
- guest-fstrim
- guest-get-fsinfo
- guest-get-host-name
- guest-get-memory-block-info
- guest-get-memory-blocks
- guest-get-osinfo
- guest-get-time
- guest-get-timezone
- guest-get-users
- guest-get-vcpus
- guest-info
- guest-network-get-interfaces
- guest-ping
- guest-set-memory-blocks
- guest-set-time
- guest-set-user-password
- guest-set-vcpus
- guest-shutdown
- guest-suspend-disk
- guest-suspend-hybrid
- guest-suspend-ram
- guest-sync
- guest-sync-delimited
