Die effektivsten Methoden zum Übertragen von Dateien von einer VM auf einen Host

Virtual machines provide many advantages, such as flexibility, rational use of resources and running in isolated environments. A common task in virtual environments is copying files between VMs and hosts. Read to learn how to copy files to a virtual machine from a host, how to transfer files from a VM to host, and how to copy files between VMs.

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The Components of Our Environment

Let’s start by going over the terminology:

• A host is a physical machine on which a hypervisor is installed.
• A hypervisor is virtualization software to run virtual machines on the host. There are two types of hypervisors:
  • Type 1: Using an ESXi server, which is the host machine
  • Type 2: Using VMware Workstation, and in this case Windows and Linux can be the OS of the host machine

In this walkthrough, the environment used to explain how to transfer files from VM to host is made up of the following components:

• ESXi host 1: 192.168.101.201
• ESXi host 2: 192.168.101.202
• Ubuntu Linux machine: 192.168.101.210
• Windows host with VMware Workstation installed
• Network: 192.168.101.0/24
• ESXi VMs and VMware Workstation VMs connected to the same network

We use the following technologies to copy files between VMs and hosts:

• Shared Folders
• Shared Clipboard and Drag & Drop
• USB Storage Device
• PowerCLI
• SSH and SCP
• NFS Share
• Download/Upload Files in a VMware web interface
• ISO Files

Using Shared Folders to Transfer a VM file to the Host

Shared Folders is a convenient feature in VMware Workstation to transfer files between a Windows or Linux physical host on which VMware Workstation is installed and VMs running on VMware Workstation. For macOS, VMware Fusion is the equivalent of VMware Workstation and supports similar features.

Let’s now go over the steps to transfer files from VM to host and vice versa using VMware shared folders.

Note: For this feature to work, VMware Tools must be installed on a VM. Data between a host and VM is transferred using interaction via VMware Tools between the host and guest OS without using a network.

1. Select a VM for which you want to configure VMware file sharing. We select one of our Windows VMs.
2. Click VM > Settings (Edit virtual machine settings) in the VMware Workstation GUI.
3. In the Virtual Machine Settings window, select the Options tab and click Shared Folders. In the Folder sharing section, select Always enabled. Optionally, you can map a shared folder as a network drive in Windows guests for more convenience by selecting the checkbox.
4. Click Add to select a folder to be used as a shared folder.

   

5. Enter the path to the folder to share on the host or click Browse and select the needed folder. We select C:tempshare-VM
   

   Enter a name for the shared folder, for example, share-VM

   Click Next.

   

6. Select Enable this share. If you want VMs to access the shared folder in the read-only mode, select the Read-only checkbox. Click Finish.

   

7. The new shared folder is now displayed in the list of shared folders in the Options tab of the Virtual machine settings window. A shared folder is enabled if the corresponding checkbox is selected next to the file name.

   Click OK to save the settings.

   

8. Open the user interface of the Windows VM used to share the folder with the Shared folders feature.
9. Click Network (My Network Places) in My Computer (This PC) or Windows Explorer to see computers available in the network.
10. Select vmware-host as the computer name on which the shared folder is configured. This name is set by default and is mapped to your physical machine (host) with the shared folder.

    

11. Click Shared Folders and select the needed shared folder (share-VM in our example). The full path to the shared folder, in our case, is

    vmware-hostShared Foldersshare-VM

You can copy files to a virtual machine from a host and to a host from a VM. We have copied Test01.txt from a Windows host to a Windows guest in our example using VMware file sharing in VMware Workstation.

For Linux guests, you can mount all VMware shared folders with the command as shown below:

• In Linux with kernel prior to 4.0:

  mount -t vmhgfs .host:/ /home/user1/shares

• In Linux with kernel 4.0 or newer:

  /usr/bin/vmhgfs-fuse .host:/ /home/user1/shares -o subtype=vmhgfs-fuse,allow_other

If you want to keep a shared folder mounted after VM reboot, add the appropriate lines with the comment and configuration in /etc/fstab , for example:

#

VMware sharing folder to transfer files between VMWare guest and host

.host:/ /mnt/hgfs/ fuse.vmhgfs-fuse defaults,allow_other,uid=1000 0 0

Before we move on to the next section, note that the shared folders feature is available only in VMware Workstation (and VMware Fusion on macOS), and it is not available for VMs running on ESXi hosts. For ESXi hosts, you can share a folder manually and use a network to copy files between Windows machines. To copy files from a VM to an ESXi host, you should use an additional tool or combine copying files from a manually shared folder with one of the methods explained below.

There are other methods for sharing a folder in Windows 10 and Windows Server 2019. You can also learn more about the SMB file sharing protocol.

If you have a Windows account with administrative rights and a security policy allows accessing hidden administrative shares available by default, you can access files on local disks of Windows machine using the path to the share like:

IP-Addressc$

Where:

IP-Address is an IP address or host name of a remote Windows machine.

C$ is the needed disk drive letter on a remote Windows machine which is a hidden system share.

Using Shared Clipboard to Transfer Files to VMs from a Host

Shared clipboard is a feature that allows you to copy and paste content like text and entire files from a virtual machine to a host machine on which VMware Workstation is installed. The process is similar to the process when you copy-paste content between different application windows in Windows or Linux with the GUI.

The full range of features is available in VMware Workstation, which allows you to transfer files to virtual machines from a host and to a host from a VM. You can drag and drop files as an alternative to copy-pasting.

Shared Clipboard in VMware Workstation

Let’s go over how to transfer files to VMware Workstation VMs using a shared clipboard and Drag & Drop. In our example, VMware Workstation is installed on a Windows host.

1. Select your VM in the left pane where VMs are listed.
2. Click Edit virtual machine settings (VM > Settings).

   

3. Select the Options tab and click Guest Isolation.

   Select two checkboxes:

   • Enable drag and drop
   • Enable copy and paste

   Click OK to save settings and close the window.

   

Shared Clipboard in VMware ESXi

As for VMs running on VMware ESXi, you cannot copy any file using drag & drop or via shared clipboard between a VM on an ESXi host and any other machine. The only option is to copy-paste text between a VM running on ESXi and your local machine (on which VMware Workstation or VMware Remote Console is installed). Copy-paste and drag & drop for files are not supported for security reasons.

However, if you cannot copy a configuration file, for example, you can copy the text content of the file using a shared clipboard. By default, the shared clipboard is disabled in the ESXi VM configuration. Do the following on an ESXi host to enable a shared clipboard to copy-paste text data:

1. The VM must be powered off when editing the VM configuration. Shut down the VM if the VM is running.
2. Open VM settings. You can use VMware Host Client and VMware vSphere Client. Select a VM, click Edit VM settings and select the VM options tab.

   Expand the Advanced Settings section and click Edit Configuration.

   

3. You need to add three configuration parameters to the VM configuration (that is written to the VM configuration VMX file). Click Add parameter.

   

4. Add these three parameters:

   isolation.tools.copy.disable FALSE

   isolation.tools.paste.disable FALSE

   isolation.tools.setGUIOptions.enable TRUE

5. Click OK and save settings.

   

As an alternative, you can manually edit a VMX file with VM configuration located on an ESXi datastore in the VM directory.

1. Log in to the ESXi shell locally or via SSH.
2. Go to the VM directory (a directory where VM files are stored on a datastore). In our case, we go to this directory:

   cd /vmfs/volumes/datastore10a/Windows-VM/

   

3. Edit the VMX configuration file. In our case, the file is Windows-VM.vmx

   vi Windows-VM.vmx

4. Add the three parameters shown above to the end of this configuration file.
5. Save changes and close the file (exit the text editor).

   

Now we can copy and paste text between our local machine and remote VM running on an ESXi host by using VMware Remote Console and VMware Workstation to connect to a VM.

Using a USB Storage Device

VMware ESXi and VMware Workstation support the USB passthrough feature, which allows you to insert a USB device into a host machine and connect this USB device to a virtual machine running on this host. You can connect a USB storage device to a host machine and virtual machine sequentially to copy files between these machines in either direction.

Note: VMware Tools must be installed on the VM guest operating system (OS) to use the USB passthrough feature.

Copying files between VMware Workstation VMs and the host

Do the following to transfer files from VM to host in VMware Workstation installed on Windows and Linux hosts (the interface is unified):

1. Power on the virtual machine.
2. Insert a USB storage device, such as a USB HDD (Hard Disk Drive) or USB flash drive, into a physical computer that is a host machine.
3. The New USB Device Detected window opens in VMware Workstation. Choose where you would like to connect your USB device:
   • Connect to the host
   • Connect to a virtual machine

   Let’s select the second option and connect our USB flash drive to the virtual machine. We are running a Windows VM in this example. If multiple VMs are running on VMware Workstation, you must select the needed VM in the list. A USB device can be connected only to one VM at time. Click OK to proceed.

   

   If your USB storage device has already been inserted into the USB port of the physical host machine on which VMware Workstation is installed, the pop-up Window with USB passthrough options won’t be displayed automatically. You can connect a USB device to a VM (disconnect from a host) in the menu:

   Go to VM > Removable Devices > Your USB Storage Device Name > Connect (Disconnect from host).

   In our example, the USB flash drive name is Kingston DataTraveler 2.0.

   

4. Now we can see the USB flash drive connected to the Windows 7 VM in the list of disk drives of My Computer (Windows Explorer). To check the USB storage device:
   • Right-click My Computer and hit Manage.
   • Go to Computer Management > Device Manager and Computer Management > Disk Management in the appropriate snap-in after you right-click.

   If a drive letter is not assigned automatically, assign the letter manually in the Disk Management snap-in.

   The workflow for Linux guests is identical. In some Linux distributions, you may need to mount a connected USB storage device like a flash drive manually in the Linux operating system.

5. Once the USB storage device has been mounted to the VM and recognized by the guest OS, copy the needed files from the VM to a USB storage device. Copying files from the USB storage device to a VM also works now.

   

6. After copying all needed files from the VM to the USB flash drive, disconnect the USB flash drive from the VM and connect this USB device to the host:

   Click VM > Removable Devices > Your USB Storage Device Name > Disconnect (Connect to host).

   

7. A USB storage device is now connected to a host machine (a Windows machine on which VMware Workstation is running in our case). We can transfer the files that were copied from the VM to the USB flash drive to your host machine.

USB passthrough from VMware Workstation to ESXi VMs

You can use a USB flash drive inserted into an ESXi server and inserted into your local Windows or Linux machine (with VMware Workstation or VMware Remote Console (VMRC) installed) that you’re using to manage an ESXi host remotely to connect this USB flash drive to an ESXi VM. In the first case, the host-connected USB passthrough is used and in the second case, the client-connected USB passthrough is used.

Let’s connect a USB flash drive inserted into our local physical Windows 10 machine to a Windows XP VM running on an ESXi host v7.0 (using the client-connected USB passthrough feature). VMware Workstation is installed on our physical Windows machine and connected to the ESXi host via the network (192.168.101.0/24).

To do this:

1. A VM must be powered off to edit the VM settings.
2. Ensure that a USB controller is present in the list of virtual hardware of the VM. You can check VM configuration in VMware Host Client. Select your VM (Windows-VM in our case), click Edit Settings and select the Virtual Hardware tab.

   

3. Let’s go back to VMware Workstation installed on our local (physical) Windows 10 machine. Click File > Connect to a server in VMware Workstation for connecting to a remote ESXi host.

   

4. Enter the ESXi server name or IP address, username and password. Click Connect.

   

5. Expand the ESXi host in the left pane of VMware Workstation where remote hosts, remote VMs on these hosts, and local VMware Workstation VMs are displayed.
6. Select a VM running on a remote ESXi host. We select Windows-VM running on 192.168.101.201. We can see a user interface of a guest OS of the selected VM after that.
7. Click VM > Removable Devices > Your USB Storage Device Name > Connect (Disconnect from Host).

   Note that we select a USB device connected to our physical Windows machine on which VMware Workstation is installed. This USB device is not a device connected to a physical ESXi host to which we have connected remotely.

   

8. Now we can see our USB flash drive connected to the Windows XP VM running on the remote ESXi host: Start > CMD > compmgmt.msc > Device Manager.

   

9. Assign a disk drive letter to the partition of the connected USB flash drive if a drive letter has not been assigned. Copy the needed files between the VM and the USB flash drive. You can transfer files to a VM and from a VM.

   

10. After copying files, you can disconnect the USB storage device from the VM and connect this device back to the local physical Windows 10 machine on which VMware Workstation is running. In the VMware Workstation GUI, click VM > Removable Devices > Your USB Storage Device Name > Disconnect (Connect to host).

Connecting a USB Flash Drive on ESXi

This method is extremely useful in some cases, for example, if you need to update a network driver on an ESXi host and you cannot use the network. Connecting a USB flash drive to ESXi is more complicated than connecting to a host machine running VMware Workstation.

There are limitations on ESXi regarding supported file systems that can be mounted to ESXi. USB flash drives or USB HDD with FAT32 and NTFS file systems are not supported. For this reason, we need to create a partition on our USB flash drive and format this partition with VFAT (which is recognized in Windows as FAT12). VFAT has limitations, such as the maximum partition size and the maximum file size. Hence, this method is not applicable for large files such as virtual disks or ISO images larger than 4 GB. However, these limits are enough to transfer configuration files, drivers, etc.

Creating a partition on a USB flash drive

First of all, let’s create a new partition on our USB flash drive and format this partition in VFAT. We can do that by attaching a USB flash drive inserted into the ESXi server to a VM (using the host-connected USB passthrough feature). Alternatively, we can insert a USB flash drive into a physical Windows or Linux machine.

In this example, we use a Windows 7 machine to prepare a USB flash drive for ESXi. Commands for Windows Server 2008R2, Windows 10 and other newer Windows versions are the same.

1. To ensure that a USB flash drive is connected to your Windows machine, right-click My Computer or This PC (or run diskmgmt.msc from CMD) to open Disk Management.
2. Open the Windows command line:

   Start > Run > cmd

3. Type diskpart in the command line and press Enter.

   You see a diskpart prompt:

   Diskpart

4. List the disks connected to your Windows machine:

   list disk

   Find your USB flash drive in the output list and remember the disk number. In our case, Disk 1 is the number of our USB flash drive (see the screenshot below).

5. Select your USB flash drive by defining the appropriate disk number you got from the above command’s output (disk 1 in our case).

   select disk 1

6. List partitions on the selected USB flash drive:

   list partition

   We have one partition (Partition 1) on our USB flash drive (see the screenshot below). Having one partition on a USB flash drive is the most popular case.

   

   Next, we need to delete partitions on the USB flash drive.

   Important: All data on the USB flash drive will be deleted. You can copy data from the flash drive if needed before going to the next steps.

7. Select a partition on the USB flash drive that is about to be deleted:

   select partition 1

8. Run the command to delete the selected partition:

   delete partition

9. Select a disk which is your USB flash drive again:

   select disk 1

   

10. Create a new partition with a VFAT file system. In this example, we create a 4-GB partition on our USB flash drive. Keep in mind that you cannot store files larger than 4 GB on VFAT. Note that VFAT supports only the 8.3 filename format.

    create partition primary size=4000 id=6

11. Format the created partition in this way for compatibility with ESXi:

    format fs=fat quick

    

12. Exit the diskpart utility (run the exit command).

A USB flash drive is ready to be recognized by ESXi and copy files. After some additional ESXi configuration steps, you can attach a USB flash drive to a VM and copy the needed file(s) to the USB flash drive.

Let’s suppose that we need to copy a ZIP archive with drivers. We have copied net-tulip.zip to a USB flash drive in our example. Next, we need to mount a partition of a USB flash drive inserted in an ESXi server in the ESXi command line.

Configuring an ESXi host to use a USB flash drive

Suppose we need to copy a ZIP archive with a driver from a USB flash drive to an ESXi datastore and then copy a VM configuration file from an ESXi datastore to a USB flash drive. The file name is net-tulip.zip in our example. Do the following on the ESXi host to transfer files to VMware ESXi from a USB flash drive and the other way:

1. Configuration is made in the command line interface. For this reason, you must enable SSH access on an ESXi host.
   • To enable remote SSH access in DCUI, go to Troubleshooting options > Enable SSH.
   • To enable remote SSH access and SSH server on ESXi in VMware Host Client, go to Host > Manage and select the Services tab. Right-click TSM-SSH and click Start to start the service. You can enable this service permanently.

   

2. Connect to the ESXi host via SSH to use the command line. You can use your favorite SSH client.
3. Stop the USB arbitrator service:

   /etc/init.d/usbarbitrator stop

   USB arbitrator automatically enables the USB passthrough feature for virtual machines residing on an ESXi host (you just need to select a USB flash drive in VM settings of the appropriate VM to use this feature).

• If you want to disable the USB arbitrator service after ESXi reboot (permanently), you can use the command:

  chkconfig usbarbitrator off

  To enable the USB arbitrator service use the appropriate command:

  /etc/init.d/usbarbitrator start

  chkconfig usbarbitrator on

4. Optional commands to check the USB devices connected to an ESXi host:

   lsusb

   esxcli storage core device list | grep -i usb

   esxcli storage filesystem list

   You can see /var/log/usb.log to check the status of a USB device.

5. You may need to disconnect and connect a USB storage device after stopping the USB arbitrator service.
6. List the block disk devices to find/identify the connected USB flash drive (or USB HDD).

   ls -ltrh /vmfs/devices/disks/

   Our USB flash drive is mpx.vmhba32:C0:T0:L0: (see the screenshot below).

   Thus, the full disk address/location is:

   /dev/disks/mpx.vmhba32:C0:T0:L0:

   

7. Check the partition number of the USB device to ensure that you have identified the right disk device:

   ls /dev/disks/mpx.vmhba32:C0:T0:L0:*

   According to the output, the full device ID, taking into account the partition number in our case, is:

   /dev/disks/mpx.vmhba32:C0:T0:L0:1

8. Locate the root folder of a USB flash drive to define the source/destination path to copy files. Run the following command and press Tab to see the available items in the volumes directory. The /volumes/ directory of the ESXi file system is a directory to which partitions with file systems are mounted.

   ls -al /vmfs/volumes/ [press Tab]

   The volume on a USB flash drive is called NO NAME

   

9. Check the contents of the USB flash drive root directory

   ls -al /vmfs/volumes/NO NAME/

   Our ZIP archive is present on the USB flash drive volume.

   

10. We have created the install folder on the ESXi datastore (datastore10a) with the commands:

    cd /vmfs/volumes/datastore10a

    mkdir install

    In the screenshot below, you can also see the directory of the VM whose configuration file we are going to copy from the ESXi datastore to a USB flash drive later.

    

11. Copy the ZIP archive from the USB flash drive to the install folder on our ESXi host (on datastore10a).

    cp /vmfs/volumes/NO NAME/net-tulip.zip /vmfs/volumes/datastore10a/install/

12. Check whether the file has been copied:

    ls -al /vmfs/volumes/datastore10a/install/

    The file has been copied successfully.

    

Similarly, you can copy files in the opposite direction – copy files from ESXi to a USB flash drive and then copy the needed file to a VM or to another machine from this USB flash drive.

1. Check the contents of the VM folder:

   ls -al /vmfs/volumes/datastore10a/Windows-VM/

2. Copy the Windows-VM.vmx configuration file from an ESXi datastore to a USB flash drive:

   cp /vmfs/volumes/datastore10a/Windows-VM/Windows-VM.vmx /vmfs/volumes/NO NAME/

3. Check whether the file was copied to the USB flash drive:

   ls -al /vmfs/volumes/NO NAME/

   

After finishing copying files on the ESXi host, you can eject the USB flash drive and start the USB arbitrator service on the ESXi host. Then you can insert the USB flash drive and use the host-connected USB passthrough feature to attach the USB flash drive to the virtual machine.

Read more about USB passthrough for ESXi and connecting a USB storage device inserted into an ESXi host to a VM residing on the ESXi host.

Using PowerCLI to Transfer Files to VMware VMs

Another method to transfer files from VM to host is using PowerCLI commands (cmdlets). VMware Tools must be installed in a guest operating system inside a VM. These PowerShell cmdlets use VMware Tools to copy files to/from VMs residing on an ESXi host. Thus, you don’t need the network if you run commands inside a VM residing on the source/destination ESXi host.

To copy files between VMs, you can use a Copy-VMGuestFile cmdlet and other cmdlets in vSphere PowerCLI.

1. Connect to an ESXi host or vCenter Server. We connect to an ESXi host in this example.

   Connect-VIServer 192.168.101.201

   

• To avoid the certificate warning, run the command:

  Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -Confirm:$false

  

Copy-VMGuestFile (Local > ESXi VM)

Use the following command to copy a file from a local machine (a machine where PowerCLI is running to a remote VM on an ESXi host):

Copy-VMGuestFile -Source "c:temptest.txt" -LocalToGuest -VM Windows-VM -Destination "c:temp-VM" -GuestUser user1 -GuestPassword Password

Where:

c:temptest.txt is the source file that we want to copy from the local machine

-LocalToGuest is the direction (from local machine to guest OS on a destination VM running on ESXi)

-VM Windows-VM is the definition of the destination VM name

c:temp-VM is the destination folder on the destination VM (where we want to store a file copy)

user1 is the user name in the guest operating system (OS) on the destination VM. This user must have access to the defined destination folder.

Password is the password for this user.

We ignore the warning about the VMware Tools version and check whether our text.txt file has been copied.

We can see that our test.txt file, whose size is 29 bytes, was copied successfully to the Windows XP VM running on an ESXi host.

Copy-VMGuestFile (ESXi VM > Local)

Now, let’s copy a file from the guest OS of the VM to a local directory of the machine where the command is executed:

Copy-VMGuestFile -Source "c:temp-VMtest2.txt" -GuestToLocal -Destination "c:temp" -VM Windows-VM -GuestUser user1 -GuestPassword Password

Where:

-Source „c:temp-VMtest2.txt“ is the path to the source file on the VM running on ESXi

-GuestToLocal is the direction (from a guest OS of the ESXi VM to the local machine where the command is executed)

„c:temp“ is the path to the destination folder on a local machine

user1 is the user name in the guest operating system on the destination VM. This user must have access to the defined destination folder.

Password is the password for this user in the guest OS

You can see examples of using the Copy-VMGuestFile cmdlet with the command:

get-help Copy-VMGuestFile -examples

Using Copy-DatastoreItem

The Copy-DatastoreItem PowerShell cmdlet is used to copy files to/from an ESXi datastore. There are 2 approaches for using this cmdlet to copy file to VMware ESXi datastore:

• If PowerCLI is installed on a Windows guest inside the VM, you can run a command to copy a file directly from an ESXi datastore to a VM and vice versa.
• If you cannot install PowerCLI on a virtual machine residing on an ESXi host, you can run PowerCLI commands from your local Windows machine, copy files from an ESXi datastore to your local machine with the Copy-VMGuestFile command, and then copy these files from your local machine to a VM with the Copy-VMGuestFile.

You must be connected to an ESXi server or vCenter Server. You can do this with the command:

ViConnect

We are connected directly to the ESXi host.

Let’s copy a VM configuration file from the datastore to the current Windows machine (the machine on which we run these commands – it can also be a VM on an ESXi host):

1. Get the information about the datastore:

   Get-Datastore "datastore10a"

2. Get an ESXi datastore object:

   $datastore = Get-Datastore "datastore10a"

3. Create a new PowerShell drive, named as ds: that maps to $datastore :

   New-PSDrive -Location $datastore -Name ds -PSProvider VimDatastore -Root