Use app-only authentication with the Microsoft Graph PowerShell SDK

In the previous blog post I have showed you how to interactively log in into the Microsoft Graph API. You had to enter a username, a password, and you had to enter a second factor. This is typically not want you want if you want to automate things. But there is another way to get access to the Microsoft Graph API. Create an app registration To get access, you have to register an app in your AzureAD.

CloudFlare API v4 and Fail2ban: Fixing the unban action

In January 2017, I wrote an article about how to protect your Wordpress blog using the WP Fail2Ban plugin, fail2ban on your Linux/ FreeBSD host, and CloudFlare. Back then, the fail2ban was using the CloudFlare API V1, which was already deprecated since November 2016. Although the actions were updated later to use CloudFlare API V4, I still had problems with the unbaning of IP addresses. IP addresses were banned, but the unban action failed.

Azure PowerShell vs. Azure RM PowerShell

In 2014, Microsoft announced the Azure Preview Portal, which was going GA in December 2015. Since January 8, 2018, the classic Azure Portal is turned off. The “Preview Portal” was more than a facelift. The classic Azure Portal was based on the Service Management mode, often called the “classic deployment model”, whereas the new Azure Portal uses the Resource Manager model. Azure Service Management (ASM) and Azure Resource Management are both deployment models.

Using WP fail2ban with the CloudFlare API to protect your website

The downside of using WordPress is that many people use it. That makes WordPress a perfect target for attacks. I have some trouble with attacks, and one of the consequences is, that my web server crashes under load. The easiest way to solve this issue would be to ban those IP addresses. I use Fail2ban to protect some other services. So the idea of using Fail2ban to ban IP addresses, that are used for attacks, was obvious.

HPE ProLiant PowerShell SDK

Some days ago, my colleague Claudia and I started to work on a new project: A greenfield deployment consisting of some well known building blocks: HPE ProLiant, HPE MSA, HPE Networking (now Aruba) and VMware vSphere. Nothing new for us, because we did this a couple times together. But this led us to the idea, to automate some tasks. Especially the configuration of the HPE ProLiants: Changing BIOS settings and configuring the iLO.

PowerCLI: Get-LunPathState

Careful preparation is a key element to success. If you restart a storage controller, or even the whole storage, you should be very sure that all ESXi hosts have enough paths to every datstore. Sure, you can use the VMware vSphere C# client or the Web Client to check every host and every datastore. But if you have a large cluster with a dozen datastores and some Raw Device Mappings (RDMs), this can take a looooong time.

A brief introduction into Azure Automation

Automation is essential to reduce friction and to streamline operational processes. It’s indispensable when it comes to the automation of manual, error-prone and frequently repeated tasks in a cloud or enterprise environment. Automation is the key to IT industrialization. Azure Automation is used to automate operational processes withing Microsoft Azure. Automation account The very first thing you have to create is an Automation account. You can have multiple Automation accounts per subscription.

Certificate-based authentication of Azure Automation accounts

Before you can manage Azure services with Azure Automation, you need to authenticate the Automation account against a subscription. This authentication process is part of each runbook. There are two different ways to authenticate against an Azure subscription: Active Directory user Certificate If you want to use an Active Directory account, you have to create a credential asset in the Automation account and provide username and password for that Active Directory account.

Starting and stopping Azure VMs with Azure PowerShell

To be honest: I’m lazy and I have a wife and two kids. Therefore I have to minimize the costs of my lab. I have a physical lab at the office and some VMs running on Microsoft Azure. Azure is nice, because I only have to pay what I really use. And because I’m only paying the actual use, I start the VMs only when I need them. Inspired by this very handy Azure VM wakeup & shutdown script, I decided to write my own script (yes, I invented a wheel again…).

How to shrink thin-provisioned disks

Disk space is rare. I only have about 1 TB of SSD storage in my lab and I don’t like to waste too much of it. My hosts use NFS to connect to my Synology NAS, and even if I use the VAAI-NAS plugin, I use thin-provisioned disks only. Thin-provisioned disks tend to grow over time. If you copy a 1 GB file into a VM and you delete this file immediately, you will find that the VMDK is increased by 1 GB.