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25 August 2026

  • 13:3213:32, 25 August 2026 LVM basics (hist | edit) [7,751 bytes] Aranzinger (talk | contribs) (Created page with "The '''Logical Volume Manager''' (LVM) allows an abstracted and flexible administration of data storage of a computer system. Compared to the traditional method using partitions, another higher '''abstraction layer''' is introduced that should enable a simpler and more efficient administration and configuration of the data carrier. For example, multiple hard drives can be combined into a '''''logical volume''''' and used as a single data storage unit. Another simplificat...")
  • 08:5108:51, 25 August 2026 Collecting System Statistics on Ubuntu using serverstats (hist | edit) [4,443 bytes] Aranzinger (talk | contribs) (Created page with "For the analysis of operating system statistics, there are numerous opportunities. For a '''rough analysis''', it is enough to take a closer look at the most important components. The '''rrd'''-used tool '''serverstats''' offers a fast and easy access to statistics and graphs about load, processes, memory and hard drive. In the following article, it is described how to install and configure serverstats on Ubuntu 14.04 LTS. == Installation == The package ''serverstat...")

21 August 2026

  • 10:1210:12, 21 August 2026 Linux Performance Analysis with collectd (hist | edit) [5,631 bytes] Aranzinger (talk | contribs) (Created page with "collectd is a daemon that collects system statistics in structured form. The data is in rrd format and can be used for '''performance analysis''' and '''reporting''' of the resource consumption. For the visual representation of the collected collectd-data, there are multiple '''frontends''', which are developed largely independently of collectd. In the following, it is explained how to install and configure collectd on Ubuntu 14.04 LTS. We will also take a look at fr...")
  • 09:0109:01, 21 August 2026 Linux Network Analysis with mtr (hist | edit) [8,031 bytes] Aranzinger (talk | contribs) (Created page with "The network diagnosis tool '''mtr''' (My Traceroute) combines the functionality of the tools traceroute and ping in an individual program. It can be used as text-based ncurses program or as graphical GTK+ program. [http://www.bitwizard.nl/mtr/ mtr] has been developed by BitWizard B.V., which is a Dutch company. == Function == The program is callled up on the command line together with a host as parameter. For the "Host" field,...")

20 August 2026

  • 12:5712:57, 20 August 2026 UEFI Secure Boot (hist | edit) [11,175 bytes] Aranzinger (talk | contribs) (Created page with " Secure Boot is a part of the UEFI specification that should guarantee the authenticity of important software parts. Critical parts of the firmware, such as the OS loader, should only be executed if they have been authorized to do so in advance by a trusted institution. Therefore, rootkits are excluded that take root even before the operating system (OS) boots. Cryptographic mechanisms ([https://de.wikipedia.org/wiki/Elektronische_Signatur Signaturen]) avoid that untru...")

18 August 2026

  • 12:0812:08, 18 August 2026 Safety Information on Intel Products 2026.3 IPU (hist | edit) [5,559 bytes] Aranzinger (talk | contribs) (Created page with "In August '''2026''', Intel published new security advisories on different Intel products as part of the IPU 2026.3. Some of these safety instructions require '''firmware updates'''. In this article, you will find an excerpt and hints on these security advisories as well as information on where to find updates on Thomas-Krenn products. == Affected systems == * Intel Xeon processors * Intel Core processors * Intel Atom processors * Intel Pentium processors * Intel Cele...")
  • 09:1509:15, 18 August 2026 AMD Safety Vulnerabilities - August 2026 (hist | edit) [6,177 bytes] Aranzinger (talk | contribs) (Created page with "On '''August 11th, 2026''', AMD published security bulletins with safety vulnerabilities. '''AMD-SB-3033'''<ref>[https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3033.html SEV Firmware Arbitrary Code Execution] (www.amd.com/en/resources/product-security)</ref> and '''AMD-SB-7064'''<ref>[https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7064.html Trusted Platform Module (TPM) Reference Code Errata] (www.amd.com/en/resources/product-securit...")

11 August 2026

  • 09:1209:12, 11 August 2026 OPNsense plugins (hist | edit) [6,322 bytes] Aranzinger (talk | contribs) (Created page with "The functions of the Open Source firewall OPNsense can be extended by multiple '''plugins'''. The following table shows the plugins available with the corresponding version numbers (OPNsense version 25.1.1): {| class="wikitable" !Plugin !Version !Description |- |os-acme-client |4.11 |ACME Client |- |os-apcupsd |1.2_3 |APCUPSD - APC UPS daemon |- |os-beats |1 |Send logs, network, metrics and heartbeat to Elasticsearch |- |os-bind |1.34_2 |BIND domain name service |-...")

6 August 2026

  • 12:4512:45, 6 August 2026 Update VMware ESXi (hist | edit) [40,553 bytes] Aranzinger (talk | contribs) (Created page with "Updates for VMware ESXi can be easily installed via the command line, even for the free version of the ESXi hypervisor. In this example, we explain how to install updates via command line using VMware ESXi 6.7.<ref>[https://kb.vmware.com/articleview?docid=2008939 “esxcli software vib” commands to patch an ESXi 5.x/6.x host] (kb.vmware.com, VMware Knowledge Base Artikel 2008939)</ref> == Download updates == In the following knowledge base article about VMware, y...")
  • 11:3011:30, 6 August 2026 IPMI configuration for Supermicro systems (hist | edit) [2,969 bytes] Aranzinger (talk | contribs) (Created page with "This article describes tools for the configuration of IPMI modules for Supermicro systems. Alternatively, the ipmitool can also be used if the server is operated on Linux (see also IPMI Configuration under Linux using ipmitool). == IPnMAC == With this tool (on Linux IPMICFG, see below), it is possible to set the IP address and the MAC address locally on the server. It must be taken into consideration that the correct MAC...")
  • 07:5107:51, 6 August 2026 Software tools for IPMI at a glance (hist | edit) [4,342 bytes] Aranzinger (talk | contribs) (Created page with "For IPMI, there are multiple software tools for different purposes and operating systems. In the following, there is an overview of useful '''IPMI tools'''. == Linux == === IPMItool === [http://ipmitool.sourceforge.net/ IPMItool] is already included in multiple Linux distributions. You can now communicate with IPMItool in two different ways with IPMI BMC's: * via network by using a so-called LAN channel. In this case, only IPMItool is required. * local...")

5 August 2026

  • 07:4807:48, 5 August 2026 Terraform with Proxmox VE tutorial (hist | edit) [17,572 bytes] Aranzinger (talk | contribs) (Created page with "This article is about the first use of Terraform with Proxmox VE. You will receive all the necessary information beginning with the installation of Terraform to the first deployment of a Proxmox resource (VM). == Overview == Once setup is complete, the basic workflow in Terraform with Proxmox VE is as follows: # '''Install Terraform''' # '''Create Proxmox API-Token:''' for Terraform to access Proxmox VE # '''Create Terraform Provider:''' Communicates Terraform that...")

31 July 2026

  • 11:0511:05, 31 July 2026 IPMI/BMC Security Vulnerability in Older Implementations (hist | edit) [5,808 bytes] Aranzinger (talk | contribs) (Created page with "== Introduction == In July 2025, attention was once again drawn to a vulnerability that has been known for many years in various implementations of the Intelligent Platform Management Interface (IPMI) and the underlying Baseboard Management Controllers (BMCs). Security researchers have identified numerous management interfaces that are available via Internet, which remain vulnerable to an attack on the authentication mechanism. The vulnerability allows, with certain req...")

30 July 2026

  • 09:4409:44, 30 July 2026 Copy-on-Write principle in ZFS (hist | edit) [6,631 bytes] Aranzinger (talk | contribs) (Created page with "'''Copy-on-Write''' is an optimization principle of data processing in which changes are not made directly to the existing data set, but are always written to a new copy. As the cornerstone of the ZFS file system's storage strategy, CoW—in combination with transaction groups—ensures that an interrupted write operation can never result in an inconsistent file system. This is why ZFS stands out from classic file systems that overwrite the data completely...")

29 July 2026

24 July 2026

  • 07:4507:45, 24 July 2026 Remove a Proxmox node from the cluster and add it again (hist | edit) [6,229 bytes] Aranzinger (talk | contribs) (Created page with "This article shows how to remove a node from a [https://www.thomas-krenn.com/de/wiki/Proxmox_VE?xtxsearchselecthit=1 Proxmox] Ceph cluster and, if necessary, add it back. == Requirements == * There must be no VMs or containers on the node to be removed. Therefore, it is recommended that you migrate them to another node beforehand (see the "Preparation" section for more information). * Please note that your cluster has enough free storage space to distribute the data o...")

23 July 2026

  • 13:3613:36, 23 July 2026 Windows Server Core Licensing (hist | edit) [7,166 bytes] Aranzinger (talk | contribs) (Created page with "Since '''Windows Server 2016''', '''Microsoft''' relies on '''core licensing'''. In this article, all important information, that is required for the '''licensing of Windows Server''', is included. It is possible to test the latest server version up to 180 days for free. A corresponding download can be found in [https://www.microsoft.com/de-de/evalcenter Microsoft Evaluation Center].<br/><br/>{{#widget:Imagebox-left|link={{...")
  • 09:1409:14, 23 July 2026 Administration of RAID with MDADM (hist | edit) [9,974 bytes] Aranzinger (talk | contribs) (Created page with "'''This article includes the general procedure of creating and administrating an array with MDADM.''' MDAMD (multiple disk administration) is a program that helps with the administration of a Software RAID in Linux. With this program, RAID-arrays can be created, configured, monitored and deleted. MDADM is released as free software under the GNU General Public License (GPL). MDADM creates so-called multiple devices (short MD) from different block devices (such as an ent...")

22 July 2026

21 July 2026

20 July 2026

  • 14:3714:37, 20 July 2026 Installation of Open WebUI with Ollama (hist | edit) [6,802 bytes] Aranzinger (talk | contribs) (Created page with "'''Open WebUI''' provides a browser-based user interface for local KI-models. In connection with Ollama, user can select models and use them via webbrowser. This article shows the installation of Open WebUI as docker container. Ollama is operated natively on the same Ubuntu server. <!-- Add after testing: * Used Ubuntu-Version: * Used Open-WebUI-Version: * Used Ollama-Version: * Used Docker-Version: * Used Testhardware: --> == Requirements == These instructions are...")
  • 12:2812:28, 20 July 2026 Activation of NVIDIA vGPU for RDS Sessions on Windows Server (hist | edit) [2,602 bytes] Aranzinger (talk | contribs) (Created page with "On Windows Server, applications within an RDS session may not use the assigned NVIDIA vGPU. Instead, Windows uses Microsoft Basic Render Driver by default. As a result, DirectX-based 3D applications, in particular, cannot access the GPU. This article shows how to activate NVIDIA vGPU for RDS-sessions. <!-- Add after testing: * Windows-Server-Version: * NVIDIA-vGPU-Version: * vGPU-Profile: * Hypervisor: --> == Requirements == The NVIDIA vGPU must be assigned to the vi...")
  • 07:4907:49, 20 July 2026 Supermicro BMC Security Advisories July 2026 (hist | edit) [1,687 bytes] Aranzinger (talk | contribs) (Created page with "In '''July 2026''', Supermicro published Security Advisories for the BMC-firmware of their mainboards. This security vulnerability requires a '''firmware update'''. In this article, you will find information on this Security Advisory and where to find updates on Thomas-Krenn products. == Security Advisories == {| class="wikitable" |- style="background-color: #EFEFEF; font-weight: bold;" ! align="center" |CVE ! align="center" |Risk potential ! align="center" |Descripti...")

17 July 2026

  • 09:3809:38, 17 July 2026 Installation of Ollama (hist | edit) [6,894 bytes] Aranzinger (talk | contribs) (Created page with "'''Ollama''' allows the local operation of Large Language Models (LLMs) on a Linux server. The models run on the own hardware and can be used via command line or HTTP-API. This article presents the native installation of Ollama on an Ubuntu server. As an example, a small model is downloaded and tested by using the local command line as well as the local API. <!-- Add the following information after testing: * Ubuntu-Version used: * Ollama-Version used: * Testhardware u...")

16 July 2026

15 July 2026

  • 14:0314:03, 15 July 2026 Synology UC3400 Metadata-Overflow (hist | edit) [3,637 bytes] Aranzinger (talk | contribs) (Created page with "frameless|322x322px|right On the Synology UC3400, a very high number of metadata objects (>10 million) leads to a critical condition in combination with migrations and snapshot load that may cause CPU and RAM overloads and cause migrations to fail. This article describes symptoms and provides possible solutions. == Initial situation == The UC3400 administrates SAN and LUN structures with the help of a internal metadata database. When there is...")

9 July 2026

8 July 2026

  • 13:4513:45, 8 July 2026 Linux network analysis with traceroute (hist | edit) [6,963 bytes] Aranzinger (talk | contribs) (Created page with "The Linux tool '''traceroute''' provides a lot of possibilities to trace the path of network packets through a network or the Internet to a specific host. This article provides an overview of the function of [http://de.wikipedia.org/wiki/Traceroute traceroute]. Furthermore, we present interesting option parameters for traceroute. In addition to traceroute, mtr is also interesting. It combines the functionality of traceroute and ping....")
  • 10:0310:03, 8 July 2026 How to set up VLAN in OPNsense (hist | edit) [3,582 bytes] Aranzinger (talk | contribs) (Created page with "'''Virtual Local Area Networks''' - VLANs - are an important tool for the network infrastructure, particularly in environments with firewall solutions such as OPNsense. They allow to divide a physical network into multiple logical networks, which improves security and organization. This article describes how to set up VLANs in OPNsense 25.1. == Assign VLAN == First, a '''VLAN-ID between 1 and 4094''' is assigned to an interface. The ID 4095 is reser...")
  • 08:0708:07, 8 July 2026 Network configuration Ubuntu - Netplan (hist | edit) [2,213 bytes] Aranzinger (talk | contribs) (Created page with "In the current version of Ubuntu Server, Ubuntu 18.04 (Bionic Beaver), the network configuration can no longer be set in the file <code>/etc/network/interfaces</code> in a default installation. Since Ubuntu 17.10, there is [http://manpages.ubuntu.com/manpages/bionic/man5/netplan.5.html Netplan], which is a new option to configure network interfaces. The network configuration is stored in .yaml-files. In addition to changes to the configuration of the network interfac...")

7 July 2026

  • 13:0713:07, 7 July 2026 NVMe-CLI (hist | edit) [21,620 bytes] Aranzinger (talk | contribs) (Created page with "The '''NVMe Command Line Interface''' ('''NVMe-CLI''') provides multiple '''functions on querying and configuring NVMe SSDs''' on Linux and FreeBSD. In this article, we explain how to install NVMe-CLI and which funtions NVMe-CLI offers. == Version information == In the Linux distributions, the following versions of NVMe-CLI are included: {| class="wikitable" |+ ! colspan="2" |Linux distribution !NVMe-CLI version |- | rowspan="3" |Debian GNU/Linux |1...")

3 July 2026

  • 07:2807:28, 3 July 2026 EFI shell USB drive (hist | edit) [1,257 bytes] Aranzinger (talk | contribs) (Created page with "The '''EFI shell''' allows to run EFI applications, such as tools for updating the BIOS or the firmware of network cards or RAID controllers. In a lot of systems, an EFI shell is already included in the BIOS. If an integrated EFI shell is missing, an USB drive with EFI shell can be used as an alternative. == Create USB stick with EFI shell == The following steps must be performed, to create an USB drive with EFI shell: # Format USB stick with '''FAT32''' # Create '''/...")

1 July 2026

  • 11:2711:27, 1 July 2026 Grafana installation and configuration on Ubuntu server 18.04 LTS (hist | edit) [4,476 bytes] Aranzinger (talk | contribs) (Created page with "'''Grafana''' is a webbased open source frontend for virtualizing metrics and for alerting when thresholds are exceeded. Grafana '''supports numerous data sources''', for example Time Series databases such as InfluxDB, Graphite or Prometheus, log files via Elasticsearch and SQL data bases. Pre-defined dashboards are available through a marketplace.<ref>[https://grafana.com/grafana/dashboards Grafana Dashboards] (grafana.com)</ref> This aticle explains the '''installa...")
  • 07:3007:30, 1 July 2026 Upload own Ubuntu packages to reprepro repository (hist | edit) [5,956 bytes] Aranzinger (talk | contribs) (Created page with "In the following article, it is explained '''how to upload''' your own Ubuntu packages to a '''reprepro''' repository. The packages are transferred in a folder on the repository server with '''dupload''' via scp and processed there via an inoticoming job from reprepro. In the examples shown, the client is running Ubuntu 12.10, and the server is running '''Ubuntu 12.04.2''' with kernel 3.2.0-38-generic. In the article Create Own apt repository using reprepro on Ubuntu...")

30 June 2026

  • 12:3712:37, 30 June 2026 Linux file systems (hist | edit) [3,206 bytes] Aranzinger (talk | contribs) (Created page with "There are numerous '''file systems''' for different application purposes. This article includes excerpts highlighting particularly relevant file systems that are also included in the Linux Storage Stack Diagram. Further file systems are mentioned in the documentation of the Linux kernel.<ref>[https://www.kernel.org/doc/html/latest/filesystems/ Filesystems in the Linux kernel] (www.kernel.org)</ref> == File systems for storing data == ==...")
  • 10:1410:14, 30 June 2026 FSCK Best Practices (hist | edit) [9,798 bytes] Aranzinger (talk | contribs) (Created page with "File system checks (FSCK) verify the consistency of '''file systems'''. Generally, a check of journaling file systems such as Ext3, Ext4, or XFS is performed quickly, since the metadata journal ensures consistency. Nevertheless, there may be situations in which a file system becomes corrupted and must be '''fixed'''. A '''regular FSCK''' is '''recommended''' on server systems to prevent file system problems. == Periodic check on Ubuntu == Ubuntu has deactivated...")
  • 07:3707:37, 30 June 2026 VMware Contract ID (hist | edit) [819 bytes] Aranzinger (talk | contribs) (Created page with "For the renewal of an existing or soon-to-expire VMware support & subscription contract, the '''Support Contract ID''' of the product is required. This information can be found in your [https://support.broadcom.com/ Broadcom Support Portal] in '''MyEntitlements.''' <gallery width="1024" height="820" showcarousel="false" slideinfozoneopacity="0.95"> file:Vmware support id 1.png|Select '''My Entitlements''' file:Vmware support id 2.png|Select your '''Site ID''' , then ''...")

29 June 2026

  • 13:5213:52, 29 June 2026 Upgrade Linux Mint Debian Edition (hist | edit) [1,209 bytes] Aranzinger (talk | contribs) (Created page with "An installation of '''Linux Mint Debian Edition''' (LMDE) can be updated to a newer version once it is released. In this example, we present the upgrade from LMDE 6 to LMDE 7. == Preparation == To prepare, the updatetool mintupgrade must be installed:<ref>[https://blog.linuxmint.com/?p=4923 How to upgrade to LMDE 7] (blog.linuxmint.com, 14.10.2025)</ref> apt update apt install mintupgrade '''Important note - create backup:''' Before you continue, we recommend t...")

19 June 2026

  • 08:1008:10, 19 June 2026 Installation of N8n (hist | edit) [8,378 bytes] Aranzinger (talk | contribs) (Created page with "'''n8n''' is a performant open-source platform for automatizing workflows. In contrast to cloud services such as Zapier or Make.com, n8n enables self-hostet operation, which allows you to maintain full control over your data, workflows, and costs. This article describes four different self-contained methods ("paths") to install n8n on a local Linux server. Select the path that fits best to your use case and follow the steps from beginning to end. == Requirements ==...")

18 June 2026

  • 12:1212:12, 18 June 2026 Creation of Proxmox HA cluster (hist | edit) [5,573 bytes] Aranzinger (talk | contribs) (Created page with "This article describes the configuration of a '''High Availability Cluster''' or '''HA Cluster''' using three servers with '''Proxmox''' '''VE''' 8.2.2. In this example, Ceph is configured within the cluster as the data storage. ==Requirements for High Availability== Before configuring the HA cluster, it must be verified if all requirements are fulfilled: *3 server systems identical in design * all nodes must be located in the same system * date and time must be sy...")
  • 09:0909:09, 18 June 2026 LVM basic configuration (hist | edit) [9,041 bytes] Aranzinger (talk | contribs) (Created page with "In the following article, the '''basic configuration''' of LVs is explained. The used system is a '''Ubuntu Server 10.4''' with the 2.6.32-24 kernel and the LVM-version 2.02.54(1) (2009-10-26). In the following, it is explained how to create '''partitions''' of '''''Physical Volumes''''' (PVs), a '''''Volume Group''''' (VG) and the '''''Logical Volumes''''' (LVs) built on top of them. ==Creating partitions== First, the partitions for the PVs are created. The following...")

17 June 2026

  • 15:1715:17, 17 June 2026 Linux performance analysis in 60 seconds (hist | edit) [1,548 bytes] Aranzinger (talk | contribs) (Created page with "When a critical '''performance issue''' arises on a Linux server, there is often little time to analyze the problem in detail. Brendan Gregg, computer performance analyst and kernel engineer, describes in a blog posting and in a video, '''which Linux commands he uses for the performance analysis in the first 60 seconds'''. == Commands for performance analysis == The following commands are recommended by Brendan Gregg:<ref>[http://techblog.netflix.com/2015/11/linux-...")
  • 14:1714:17, 17 June 2026 Docker basics - the most important terms (hist | edit) [1,331 bytes] Aranzinger (talk | contribs) (Created page with "This article provides an introduction in Docker and shows useful terms, which can be useful when using Docker and Docker containers: <pre> # Start container docker container run <IMAGENAME> starts a container based on an image (Example: checkmk/check-mk-raw:2.2.0-latest) # List containers (active) docker ps displays a list of all containers that are currently active # List containers (all) docker ps -all displays all containers on the system including those that ha...")
  • 10:4410:44, 17 June 2026 Measuring TCP and UDP Network Performance with iperf (hist | edit) [4,338 bytes] Aranzinger (talk | contribs) (Created page with "'''iperf''', the open-source tool, allows to measure the maximum TCP and UDP network bandwidth. It is an alternative for netperf<ref>[http://www.netperf.org/ Netperf] (www.netperf.org)</ref>. == Installation == Iperf is already included in the Debian and Ubuntu repository, which means that an installation is easy possible via <code>apt-get install iperf</code>. For RHEL and CentOS, the package is available in the EPEL<ref>[http://dl.fedoraproject.org/pub/epel/6/x86_64...")
  • 07:4007:40, 17 June 2026 Permanently Change the Root Data Directory in Docker (hist | edit) [2,589 bytes] Aranzinger (talk | contribs) (Created page with "This article explains how to permanently switch the default root data directory <code>/var/lib/docker/</code> to a different directory. == Background information == The <code>/var/lib/docker</code> directory stores all images, volumes from Docker and can grow significantly depending on how many containers are used. The directory is structured as follows:<pre> root@js-checkmk-02:/var/lib/docker# ls buildkit containers engine-id image network overlay2 plugins runt...")

16 June 2026

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