Passed AZ-303

 It is official! after passing AZ-303 today, I am now a Microsoft Certified Azure Solutions Architect Expert.

Passed AZ-304

 Today, I passed AZ-304 exam ! 

One more to go to get Azure Solution Architect Expert

http://aka.ms/AzureCerts_SolutionsArchitect

Microsoft Azure Administrator Associate

 Passed AZ-104 exam today!! 

I am now officially Microsoft Azure Administrator Associate certified!! 

Microsoft Certified: Azure Security Engineer Associate

 Passed AZ-500 today!!

Hyper-V Nested VM

To allow your VM to run Hyper-V role, you need to expose the virtualization extension to the Hyper-V host by running the following PowerShell command:

> Set-VMProcessor -VMname MyVM -ExposeVirtualizationExtensions $true

My QNAP TS-412 had a major issue, 2 of the RAID5 disks decided to fail at the same time. Luckily QNAP was still up and running and allow READ-ONLY access to my data. However, all the iSCSI LUNs are not accessible anymore from my iSCSI clients.

Found the attached document which basically helped me recover my iSCSI LUNs. I copied by iSCSI LUN files to the backup locations and rebuild by NAS volumes. I then follow the procedure #3 in the document to get my iSCSI LUNs back.

Ubuntu DNS Stub Listener #Disable

During setting up PiHole, it requires to listen on DNS (53/TCP, 53/UDP) on the host. Ubuntu version that I am running on (20.04) by default listens on port 53 because it runs as DNS Stub Listener.

PiHole will give errors about Binding error

To disable Ubuntu running as DNS Stub Listener, do the followings:

> sudo vi /etc/systemd/resolved.conf 

un-comment #DNSStubListener=yes 
change it to DNSStubListener=no

> sudo service systemd-resolved restart
> sudo systemctl disable systemd-resolved.service
> sudo systemctl stop systemd-resolved
> sudo mv /etc/resolv.conf /etc/resolv.conf.old
> sudo shutdown -h now -r