Powershell Script for Quickly Creating Active Directory Security Groups

nbeam published 8 years ago in Domain Administration, Microsoft, Powershell, Windows Administration. Tags: , ,

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I found myself creating security groups for different servers in one of my domains over and over again and using the GUI can get a bit tedious. So I decided to write a quick powershell script that provides an interactive prompt asking for the server name, group type (select from options) and then from there creates a security group called “SERVERNAME-GROUP” in Active Directory. In my case, I had three different groups for each server, local “Admins”, local “Users”, and finally a special group for database admins used in Microsoft SQL Server. This requires the Active Directory module for powershell and must be run from a Domain Controller.

Below is the powershell code: (more…)

DKIM and SPF with Exim4 – Better Mail Delivery

nbeam published 8 years ago in Email, Linux. Tags: , , ,

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This is going to be very short and sweet as it is primarily just a note to self. I stuggled with getting outbound mail delivery working for some time and finally got it all figured out. Using Exim4 for mail sending I did the following:
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Proxmox – Delete Disk Image on ZFS storage – Stop Running Proxmox Tasks

nbeam published 8 years ago in Containers, Disk Administration, Linux, ProxMox, Storage, Virtual Administration, Virtualization, ZFS. Tags: , ,

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I had a VM using RAW storage format on a ZFS storage object. I needed to delete the RAW hard drive files but couldn’t find them and the “remove” button was greyed out. One post mentioned using “qm rescan” which then allowed the poster to use the remove button but that didn’t work for me. After some research I found out that virtual drives on ZFS storage aren’t actually files but are “ZVOL”s. After a bit more research I came across the solution below to remove these drives manually. (more…)

Add Ubuntu 14.04 Server or Desktop to Microsoft Active Directory Domain – Login to Unity with Windows Domain Credentials

nbeam published 8 years ago in Authentication, Domain Administration, Information Security, Linux, Microsoft, Server 2012R2, Ubuntu, Windows Administration. Tags: , , , , , , ,

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For this tutorial I will be walking through how to use a tool called Realmd to connect an Ubuntu Server or Ubuntu Desktop system to a Windows Active Directory Domain.

In the past I wrote an article talking about how to use Powerbroker Identity Services to do the same thing, but the scope of the article was limited to the server version of Ubuntu only. Furthermore, it has since been my experience that PBIS is an unreliable solution at best.

Part of the confusion I have had on this issue in the last two years has been in thinking that there are only one or maybe two ways to make an Ubuntu Desktop/Server OS connect to a Microsoft Active Directory domain and they both used the same underlying stuff. In fact there are more like 10 different ways to do it all using a mix and match of different technologies.

Finally, I don’t like proprietary stuff. PBIS, while having a free version, was still proprietary. Today we will be using a suite of tools called SSSD. SSSD was created by Redhat and it’s opensource. Furthermore we will be using RealmD, which is a “wrapper” of sorts for SSSD that makes it easier to setup and configure. That’s the short of it. Let’s get started. (more…)

Proxmox 4.0 – Container NAT with Datacenter and Node Firewall

nbeam published 8 years ago in Containers, Firewalls, Information Security, Linux, Network Security, Networking, ProxMox, Virtual Networking, Virtualization. Tags: , , ,

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I have a limited number of IPv4 addresses available to me on my servers. So I am really frugal with how I assign them.

Whenever possible, my preference is to use NAT off of the main Proxmox IP. However I struggled to get this setup while also using the built-in Proxmox firewall that comes in version 4.0. Having an enabled firewall is an absolute requirement for me.

In this article I have documented the final working solution. (more…)