I needed to run some simple tasks from a PowerShell session on a remote Windows computer. I thought this would be no problem – just fire up the PowerShell container that Microsoft provides and start a remote session but of course it is never that easy. I will be using the mcr.microsoft.com/powershell:preview container. To start […]
Read more >While updating some servers I ran into an issue when updating the available packages. These servers are using the third party repository packages.sury.org to get alternative PHP releases. The error was: Some sources suggested replacing the GPG key in /etc/apt/trusted.gpg.d/php.gpg: [SOLVED] The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key [SOLVED] PHP apt […]
Read more >These steps allow you to connect to Exchange Online using Powershell inside a Docker container from a Linux host. in my example I am connecting to Exchange Online from Ubuntu 21.04. For the Docker container image I am using the official Azure Powershell container from Microsoft (mcr.microsoft.com/azure-powershell). The account I am using to administer Exchange […]
Read more >Choosing a specific cipher to use for SSH can have a large performance impact when transferring files using tools that use SSH as a transport. For testing, I decided to benchmark the impact of using scp with various ciphers locally on my laptop as well as a VPS from Linode. The laptop has a Intel […]
Read more >After ugrading Kubuntu 20.10 (Groovy) to 21.04 (Hirsute), I started getting the following error when trying to build any Docker containers: Various Googling pointed to the result; simply installing the gnome-keyring package resolved the problem: After doing that everything worked as expected. EDIT: After using the OS some more, I realized that the problem was […]
Read more >The wp-cron.php script for WordPress handles various scheduled events (such as checking for updates, publishing scheduled posts and more). By default this will be executed at each page load (to check if anything needs to be done). A common recommendation is to disable this and instead run it as a cron job. We deal with […]
Read more >At the time of writing, the Linode Longview agent is not working with MariaDB 10.5 onwards. This happens because there is a hard coded binary name in the Perl script responsible for determining if MySQL monitoring is required; from MariaDB 10.5 the binary name has changed from mysqld to mariadbd. To fix this the Perl […]
Read more >These are the steps I use to get a dump of all password hashes from a domain controller and then crack the hashes with hashcat or john. Excluding the dumping of password hashes, these steps are all executed on a Linux host. If you are trying to do this completely from Windows you will need […]
Read more >When working with lists of IP’s with Puppet there are some common tasks that you will most likely encounter: Aggregate IP’s – As an example, if you have a firewall rule and the source list is like this: That list can be condensed into a single rule for only 192.0.2.0/24. You may also be working […]
Read more >For convenience I like to name the interfaces for my desktop/laptop in an easy to remember convention so that I don’t need to think about what the interface names are at all when running things like tcpdump. The best way I have found to do this is with udev rules. The original interface names will […]
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