qemu-guest-agent

nova image-meta image-id set hw_qemu_guest_agent=yes

glance image-create --name cirros
--disk-format raw
--container-format bare
--file cirros-0.3.3-x86_64-disk.raw
--public
--property hw_qemu_guest_agent=yes
--progress

可以通过命令来读取虚拟机内部真实 ip

virsh qemu-agent-command instance-xxx '{"execute":"guest-network-get-interfaces"}'

virsh qemu-agent-command instance-00000083 '{"execute":"guest-info"}' |python -m json.tool

virsh qemu-agent-command instance-00000083 '{"execute":"guest-file-open", "arguments":{"path":"/proc/cpuinfo","mode":"r"}}'

virsh qemu-agent-command instance-00000083 '{"execute":"guest-file-read", "arguments":{"handle":1003,"count":10000}}'

已有功能
目前qga最新版本为1.5.50,linux已经实现下面的所有功能,windows仅支持加*的那些功能:

Ø guest-sync-delimited*:宿主机发送一个int数字给qga,qga返回这个数字,并且在后续返回字符串响应中加入ascii码为0xff的字符,其作用是检查宿主机与qga通信的同步状态,主要用在宿主机上多客户端与qga通信的情况下客户端间切换过程的状态同步检查,比如有两个客户端A、B,qga发送给A的响应,由于A已经退出,目前B连接到qga的socket,所以这个响应可能被B收到,如果B连接到socket之后,立即发送该请求给qga,响应中加入了这个同步码就能区分是A的响应还是B的响应;在qga返回宿主机客户端发送的int数字之前,qga返回的所有响应都要忽略;

Ø guest-sync*:与上面相同,只是不在响应中加入0xff字符;

Ø guest-ping*:Ping the guest agent, a non-error return implies success;

Ø guest-get-time*:获取虚拟机时间(返回值为相对于1970-01-01 in UTC,Time in nanoseconds.);

Ø guest-set-time*:设置虚拟机时间(输入为相对于1970-01-01 in UTC,Time in nanoseconds.);

Ø guest-info*:返回qga支持的所有命令;

Ø guest-shutdown*:关闭虚拟机(支持halt、powerdown、reboot,默认动作为powerdown);

Ø guest-file-open:打开虚拟机内的某个文件(返回文件句柄);

Ø guest-file-close:关闭打开的虚拟机内的文件;

Ø guest-file-read:根据文件句柄读取虚拟机内的文件内容(返回base64格式的文件内容);

Ø guest-file-write:根据文件句柄写入文件内容到虚拟机内的文件;

Ø guest-file-seek:Seek to a position in the file, as with fseek(), and return the current file position afterward. Also encapsulates ftell()'s functionality, just Set offset=0, whence=SEEK_CUR;

Ø guest-file-flush:Write file changes bufferred in userspace to disk/kernel buffers;

Ø guest-fsfreeze-status:Get guest fsfreeze state. error state indicates;

Ø guest-fsfreeze-freeze:Sync and freeze all freezable, local guest filesystems;

Ø guest-fsfreeze-thaw:Unfreeze all frozen guest filesystems;

Ø guest-fstrim:Discard (or "trim") blocks which are not in use by the filesystem;

Ø guest-suspend-disk*:Suspend guest to disk;

Ø guest-suspend-ram*:Suspend guest to ram;

Ø guest-suspend-hybrid:Save guest state to disk and suspend to ram(This command requires the pm-utils package to be installed in the guest.);

Ø guest-network-get-interfaces:Get list of guest IP addresses, MAC addresses and netmasks;

Ø guest-get-vcpus:Retrieve the list of the guest's logical processors;

guest-set-vcpus:Attempt to reconfigure (currently: enable/disable) logical processors inside the guest。

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