The operating system OpenBSD is used widely for network routing and firewall. Also really easy to install for you Virtual Machine lab environment. In this blog bost I want to explain how to turn an OpenBSD installation quick in router and NAT with PF for your environment. This blog post will just explain the basic and for more advanced settings you can go from here. Install OpenBSD Make sure you create an new VM with at least 2 network interfaces,…
Finding perfomance bottlenecks on Linux can be easy done for CPU and Memory usage. The bottleneck is disk IO it seems more difficult to find the right tool for this. Luckely their is an easy way to read the disk IO statistics in Linux, try: This will give you the total amounts, this are the values: read I/Os requests number of read I/Os processed read merges requests number of read I/Os merged with in-queue I/O read sectors sectors number of sectors…
Larger organizations often use Microsoft Active Directory for user login. Login accounts are used also for Administrators of the IT department. In this blog I want to explain how I added an Ubuntu Linux server to the domain. I used the AD user accounts to login through SSH for administrative tasks. During the building of an new Ubuntu server I want to use the AD for authentication on my Ubuntu Linux host. This means the login process needs to be attached to AD to…