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--- maintenance:general:hyperv [2021/01/25 10:59] – created bdorlandt
+++ maintenance:general:hyperv [2024/07/03 12:31] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== Hyper-V hypervisor ======
+This document describes what is required to migrate from a virtual machine on VirtualBox to Hyper-V.
+===== Centos 7 =====
+In order to migrate Centos 7, there are a couple of possibilities.
+  - Make modifications after migration
+  - Make modifications before migration
+In both situations you'll need the Virtual HardDisk (VHD), which can be copied from the GUI or using the CLI.
+If you have the OVA, you may extract it using tar and clone the disk to the VHD format:
+<code bash>
+tar xvf VM_name.ova
+VBoxManage clonemedium disk VM_name-disk001.vmdk VM_name-disk001.vhd --format vhd
+</code>
+The second command can be used directly on the source as well.
+==== Option 1: Before the migration ====
+Make the following modifications to the OS, before creating the VHD.
+  - make sure you are root
+  - create a file /etc/dracut.conf.d/hyperv.conf
+    - with the contents: ''add_drivers+="hv_vmbus hv_storvsc hv_netvsc hv_utils hv_balloon hyperv-keyboard hyperv_fb hid-hyperv"''
+  - type: ''dracut -f''
+==== Option 2: After the migration ====
+  - Reboot into "rescue" mode
+  - make sure you are root
+  - create a file /etc/dracut.conf.d/hyperv.conf
+    - with the contents: ''add_drivers+="hv_vmbus hv_storvsc hv_netvsc hv_utils hv_balloon hyperv-keyboard hyperv_fb hid-hyperv"''
+  - type: ''dracut -f /boot/initramfs-3.10.0-1160.11.1.el7.x86_64.img --kver 3.10.0-1160.11.1.el7''
+    - make sure you've typed the correct filename and version
+  - reboot to the desired kernel
+==== Create the VM with the existing VHD ====
+You have the VHD copied to your Hyper-V machine and are now in the process of setting up the Virtual Machine. Make sure you select a "type-1" Virtual Machine and at the step of the Harddisk select, choose the existing option and select the VHD.
+Once done, make sure you have "checkpoints" disabled.
+Once you boot, you will see the system hanging. This is due to the fact the previously created kernel with initramfs doesn't have the necessary drivers for Hyper-V.
+To "Fix" this, we will modify the initramfs to include the necessary drivers. See option 2: After the migration.