在文档中https://www.virtualbox.org/manual/ch07.html
他们告诉你你可以使用
$ VBoxManage modifyvm VM-name --vrde on
但这仅在虚拟机关闭时才有效。
虚拟机开启时可以执行此操作吗？怎么做？
--
词汇表：
RDP：远程桌面协议
VM：虚拟机
真空干燥机：VirtualBox 远程桌面扩展
答案1
是的。
列出虚拟机（获取名称）
$ VBoxManage list vms
"Debian_11_Server_64bit" {3d**6e14-3846-4673-aacb-726****283af}
"emptyVM" {8a**643a-f470-4ab0-931a-5da6****5ce4}
- 当虚拟机关闭时启用/禁用 VRDP
# Power off
$ vboxmanage controlvm emptyVM poweroff
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
# Turn off VRDP
$ VBoxManage modifyvm emptyVM --vrde off
# Turn on VRDP
$ VBoxManage modifyvm emptyVM --vrde on
- 当虚拟机开启（或关闭）时启用/禁用 VRDP
# We start the VM
$ vboxmanage startvm emptyVM --type headless
Waiting for VM "emptyVM" to power on...
VM "emptyVM" has been successfully started.
# Try the previous command
$ VBoxManage modifyvm emptyVM --vrde on
VBoxManage: error: The machine 'emptyVM' is already locked for a session (or being unlocked)
VBoxManage: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component MachineWrap, interface IMachine, callee nsISupports
VBoxManage: error: Context: "LockMachine(a->session, LockType_Write)" at line 640 of file VBoxManageModifyVM.cpp
当虚拟机处于开启状态时，无法使用“modifyvm”更改 VRDP 设置。
但我们仍然可以用“controlvm”来改变它们。
$ VBoxManage controlvm emptyVM vrde off
$ VBoxManage controlvm emptyVM vrde on
- 我如何知道它是否已启用/禁用以及端口？
$ vboxmanage showvminfo emptyVM | grep VRDE
VRDE: enabled (Address 0.0.0.0, Ports 3394, MultiConn: off, ReuseSingleConn: off, Authentication type: null)
VRDE port: 3394
VRDE property : TCP/Ports = "3394"
VRDE property : TCP/Address = <not set>
VRDE property : VideoChannel/Enabled = <not set>
VRDE property : VideoChannel/Quality = <not set>
VRDE property : VideoChannel/DownscaleProtection = <not set>
VRDE property : Client/DisableDisplay = <not set>
VRDE property : Client/DisableInput = <not set>
VRDE property : Client/DisableAudio = <not set>
VRDE property : Client/DisableUSB = <not set>
VRDE property : Client/DisableClipboard = <not set>
VRDE property : Client/DisableUpstreamAudio = <not set>
VRDE property : Client/DisableRDPDR = <not set>
VRDE property : H3DRedirect/Enabled = <not set>
VRDE property : Security/Method = <not set>
VRDE property : Security/ServerCertificate = <not set>
VRDE property : Security/ServerPrivateKey = <not set>
VRDE property : Security/CACertificate = <not set>
VRDE property : Audio/RateCorrectionMode = <not set>
VRDE property : Audio/LogPath = <not set>
VRDE Connection: not active
- 如何更改端口
$ vboxmanage controlvm emptyVM vrdeport 12345
- 当虚拟机关闭时，使用“controlvm”所做的更改是否会保留？
下面我们关闭虚拟机，禁用 VRDP，打开电源，修改 VRDP，关闭电源并检查。显然，更改是持久的。
$ vboxmanage controlvm emptyVM poweroff
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
$ VBoxManage modifyvm emptyVM --vrde off
$ vboxmanage showvminfo emptyVM | grep VRDE
VRDE: disabled
$ vboxmanage startvm emptyVM --type headless
Waiting for VM "emptyVM" to power on...
VM "emptyVM" has been successfully started.
$ vboxmanage showvminfo emptyVM | grep VRDE
VRDE: disabled
VRDE Connection: not active
$ vboxmanage controlvm emptyVM vrde on vrdeport 12345
$ vboxmanage showvminfo emptyVM | grep VRDE
VRDE: enabled (Address 0.0.0.0, Ports 12345, MultiConn: off, ReuseSingleConn: off, Authentication type: null)
VRDE port: 12345
VRDE property : TCP/Ports = "12345"
VRDE property : TCP/Address = <not set>
VRDE property : VideoChannel/Enabled = <not set>
VRDE property : VideoChannel/Quality = <not set>
VRDE property : VideoChannel/DownscaleProtection = <not set>
VRDE property : Client/DisableDisplay = <not set>
VRDE property : Client/DisableInput = <not set>
VRDE property : Client/DisableAudio = <not set>
VRDE property : Client/DisableUSB = <not set>
VRDE property : Client/DisableClipboard = <not set>
VRDE property : Client/DisableUpstreamAudio = <not set>
VRDE property : Client/DisableRDPDR = <not set>
VRDE property : H3DRedirect/Enabled = <not set>
VRDE property : Security/Method = <not set>
VRDE property : Security/ServerCertificate = <not set>
VRDE property : Security/ServerPrivateKey = <not set>
VRDE property : Security/CACertificate = <not set>
VRDE property : Audio/RateCorrectionMode = <not set>
VRDE property : Audio/LogPath = <not set>
VRDE Connection: not active
$ vboxmanage controlvm emptyVM poweroff
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
$ vboxmanage showvminfo emptyVM | grep VRDE
VRDE: enabled (Address 0.0.0.0, Ports 12345, MultiConn: off, ReuseSingleConn: off, Authentication type: null)
VRDE property : TCP/Ports = "12345"
VRDE property : TCP/Address = <not set>
VRDE property : VideoChannel/Enabled = <not set>
VRDE property : VideoChannel/Quality = <not set>
VRDE property : VideoChannel/DownscaleProtection = <not set>
VRDE property : Client/DisableDisplay = <not set>
VRDE property : Client/DisableInput = <not set>
VRDE property : Client/DisableAudio = <not set>
VRDE property : Client/DisableUSB = <not set>
VRDE property : Client/DisableClipboard = <not set>
VRDE property : Client/DisableUpstreamAudio = <not set>
VRDE property : Client/DisableRDPDR = <not set>
VRDE property : H3DRedirect/Enabled = <not set>
VRDE property : Security/Method = <not set>
VRDE property : Security/ServerCertificate = <not set>
VRDE property : Security/ServerPrivateKey = <not set>
VRDE property : Security/CACertificate = <not set>
VRDE property : Audio/RateCorrectionMode = <not set>
VRDE property : Audio/LogPath = <not set>