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Category: Linux

September 15, 2022September 15, 2022

DB_VERSION_MISMATCH error when updating AlmaLinux 8 / RHEL 8 / Rocky Linux

When trying to update the operating system, you might receive an error similar to the following … This can be fixed with the following command to remove the existing database …

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February 21, 2022

Disable the floppy drive module in Linux(Ubuntu)

Sometimes Linux will mistakenly detect a floppy device and create a reference to it because your system does not actually have a floppy drive and you will see errors on the login screen that look similar to blk_update_request: I/O error, dev fd0, sector 0. I find this frequently happens on a VMWare VM. This doesn’t…

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February 21, 2022

Generate Certificate Signing Request (CSR) in Linux

Replace domain with your domain. domain.csr is what is used by your certificate authority togenerate your certificate. domain.key will be used by your web server in conjunction with yourcertificate.

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February 21, 2022February 21, 2022

Fix software updates in Cockpit in Ubuntu 20.04

Software updates on the Ubuntu system will fail because Cockpit on Ubuntu doesn’t detect a networkconnection. To fix this, you must use NetworkManager instead of the default networkd. You need to be root or sudo root for all these commands. Edit your netplan file in /etc/netplanand add the following two lines under network:. Remember that…

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November 24, 2021February 21, 2022

Install syslinux on Windows Server 2019 WDS

Once Windows Deployment Services is installed and running, locate the folder where WDS is installed.My install is in D:\RemoteInstall. Rename pxeboot.n12 in D:\RemoteInstall\Boot\x64 to pxeboot.0. Rename abortpxe.com in D:\RemoteInstall\Boot\x86 to abortpxe.0. Download syslinux. I used version 5.04. Your mileage may vary with other versions. From the syslinux archive, extract core\pxelinux.0, com32\menu\vesamenu.c32, com32\modules\chain.c32, memdisk\memdisk to D:\RemoteInstall\Boot\x86…

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November 23, 2021February 21, 2022

PXE Config examples

I’ve set up a local http web server. You can use another web server mirror if you want.

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September 24, 2021February 21, 2022

Set up unattended-upgrades on Ubuntu 20.04

Package upgrades can be set up to install updates on Ubuntu without user intervention. Install unattended-upgrades Install mailx & Postfix If this does not install Postfix, install it now. This will install also install Postfix. mailx is what unattended upgrades uses to send external mail. Configure unattended-upgrades. Edit /etc/apt/apt.conf.d/50unattended-upgrades. This file is mostly self explanatory….

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July 16, 2021February 21, 2022

Install GNS3 on UNRAID on your local
network

GNS3 allows network engineers to model networks. Unlike network simulators, GNS3 uses real deviceimages. The devices run on a hypervisor. Unraid is an easy to use NAS operating system based onSlackware that supports docker images and virtual machines. Create a VM in Unraid We will be using Ubuntu 20.04 as the base of GNS3. Install…

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June 10, 2021February 21, 2022

Quick reverse proxy config for nginx

nginx is my preferred lightweight HTTP/HTTPS server and fairly easy to do reverse proxy for. In thisexample, I use a reverse proxy to expose an internal service running on port 82 to the Internet.Here is an example config … example.vernon.wenberg.net is a sub-domain that exists on the public Internet whileinternal-service.vernon.wenberg is an internal system. This…

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May 28, 2021February 21, 2022

Install Apache, FreeRadius, daloRADIUS, and MariaDB on Ubuntu 20.04

This quick guide assumes you are root or using sudo on a fresh install of Ubuntu Server 20.04. Install apache2, MariaDB, and PHP Install Apache Install PHP Install MariaDB Install FreeRADIUS w/ MariaDB Install FreeRADIUS Use MariaDB with FreeRADIUS Login to MariaDB with the password you just created. Remember to replace password withyour own password….

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Disclaimer

These posts are notes for me. These are not guides and you should not use these instructions as step-by-step instructions without knowing what they do.

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