Tag Archives: vm

How to Install Mikrotik RouterOS on VirtualBox

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Note that there are a couple of limitations of using the Cloud Hosted Router (CHR). The main issue is that the default license doesn’t allow for more than 1Mbps on each interface.

https://help.mikrotik.com/docs/display/ROS/Cloud+Hosted+Router%2C+CHR#CloudHostedRouter,CHR-CHRLicensing

Download the VDI version of CHR from the Mikrotik downloads page.

https://mikrotik.com/download

Mikrotik has instructions for installing CHR in VirtualBox, so this post is more of just a summary.

https://wiki.mikrotik.com/wiki/Manual:CHR_VirtualBox_installation

  1. Create a VM with Type Linux, Version Other Linux (64-bit)
  2. While setting up the VM, select the VDI downloaded from Mikrotik as the virtual disk.
  3. Start the VM and login with admin for the username and nothing for the password.

The easiest way to spin up more vm’s to right click on the VM and Clone.

Kali Linux Hash Sum Mismatch while doing apt update

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https://askubuntu.com/questions/1235914/hash-sum-mismatch-error-due-to-identical-sha1-and-md5-but-different-sha256

Looks like the problem is caused by the Windows Hypervisor Platform. Work around is to disable it.

In the Start menu search for “turn Windows features on or off”

Once open, disable “Virtual Machine Platform” and “Windows Hypervisor Platform”

Disable Virtual Machine Platform

You will need to reboot after it finishes.

Notes on Migrating UniFi-Video NVR Disk

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Recently upgraded a UniFi-Video VM by creating a new VM and restoring the backup from the previous one. There was a separate virtual disk used for storing all the videos. Although once I reattached it, I had to change the owner to the unifi-video user. lt was reporting that the owner/group was 127 and 134, looks like that was the user ID from the previous VM.

Example output from ls -hla command

drwxr-xr-x 3 127 134 4.0K Jan 16 2020 176de761-8399-3bed-8ceb-917cbe4d25bd
drwxr-xr-x 2 127 134 4.0K Sep 10 12:28 21d506ef-dded-31f2-baf8-c109a7e653b9
drwxr-xr-x 4 127 134 4.0K Jan 1 2020 1a3afc4c-a030-39a1-b139-857444c8b71c

Ended up changing the owner to the unifi-video owner with the chown command. /path/to/videos is the mount point of the video drive.

chown -R unifi-video:unifi-video /path/to/videos

VirtualBox – VERR_NEM_VM_CREATE_FAILED

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Looks to be an issue if you have Windows HyperV enabled.

Search for and Open up the “Turn Windows features on or off” and make sure “Windows Hypervisor Platform” is unchecked and hit OK to apply it.

Disable Windows Hypervisor Platform

Reboot computer and launch VM

https://superuser.co/questions/1442766/virtualbox-fails-to-start-with-verr-nem-vm-create-failed

Failed to acquire the VirtualBox COM object.

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It appears that the issue could be a corrupt VirtualBox.xml file. The one I had did not have anything in it. Removing or moving the file let it create a new one and let VirtualBox actually start.

mv ~/.config/VirtualBox/VirtualBox.xml{,old}

Only problem is that none of the VM’s showed up. Was able to go to the ~/VirtualBox folder in a file browser and launch the vbox file to start the VM

Install VirtualBox Guest Addition for Kali Linux

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Boot up the virtual machince

Insert the “Guest Additions CD Image…” from the Devices menu

In the VM, open up Files/Nautilus or Dolphin and find the CD. Open a terminal in the same directory and execute the auto run script

sudo sh autorun.sh

It should pop up another window to install the guest additions. After it is installed, you’ll need to reboot the VM for the new changes to take effect.

esxtop not displaying properly and is not interactive

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Ran into an issue where esxtop was basically displaying a bunch of CSV data that was hard to make sense of in a terminal.

From reading here https://kb.vmware.com/s/article/2001448

It appears that the issue is that the environment TERM variable is not specified.

echo $TERM

returns nothing.

To fix, specify the terminal to use

TERM=xterm

To get a list of terminals available, run the following

find /usr/share/terminfo -type f

Increase hard disk size on Windows VM in XenServer

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To increase a Windows VM disk size you’ll first need to shut down the VM and then increase the disk size from XenCenter.  When you boot back up into the VM, the extra space shows up as unallocated.  All that needs to be done is the main partition needs to be extended.

Open up the Windows Disk Management Utility.  You can do this by clicking on the start button, typing in disk management and hit enter.  This will bring up the Disk Management program.

In disk manager, you should see the Unallocated space at the end of Disk 0, i.e. your main drive.  Right click on your main partition (C:) and click Extend Volume.  You will be presented with a wizard that will walk you through extending your disk.

Example:

Before increasing the VM’s disk size.

0

The unallocated space is the extra space that we added via XenCenter.  Right click on the middle partition (C:), and click extend.

1

After were are finished extending the partition, we see that our main partition is about 8GB larger.

3