April 10, 2019

Running cf-runagent as non-root

I work at Northern.tech, developing CFEngine, a configuration management system. This is a work (CFEngine) related post. cf-runagent is a component for triggering remote agent runs using the CFEngine network protocol. It does not allow for arbitrary commands to be executed, but rather asks the remote host to run the policy it already has. To trigger cf-runagent from other systems or web interfaces, you want to be able to run it as non-root. Read more

March 18, 2019

Editing windows registry using PowerShell

CFEngine Enterprise supports Windows and Windows Registry manipulation. In CFEngine policy you can both read from and write to the registry. I needed a way to test these features, and I prefer ssh access over GUI, so I made this short reference. View See keys (folders) at a path: Get-ChildItem -Path "HKLM:\SOFTWARE\" See all properties (values) in key: Get-Item -Path "HKLM:\SOFTWARE\CFEngine\" See specific property in key: Get-ItemProperty -Path "HKLM:\SOFTWARE\CFEngine\" -Name "VERSION" Create Create a new key (folder) at a path: Read more

March 12, 2019

Fixing your mac keyboard in X11 (RHEL 7)

Alternatively: How xkb works, and how to change keys which are wrong. On OS X, there is no alt+gr. Combinations of shift and alt are used instead. Both alt keys behave the same. You can make your Apple internal or external keyboard behave like this on Linux. This blog post shows how, but please note that it changes the behavior of your alt keys. So keyboard shortcuts which rely on alt might not work any more. Read more

March 11, 2019

Introducing cf-remote: Tooling to deploy CFEngine

I work at Northern.tech, developing CFEngine, a configuration management system. This is a work (CFEngine) related post. About a year ago, I wrote a small python script to automate installing and bootstrapping CFEngine on virtual machines in AWS. It had some hard coded IP addresses that I needed to update when I spawned new hosts, but other than that, it worked well. During manual testing, it saved me a lot of time instead of having to do things manually. Read more

July 27, 2018

Using Systemd to ensure unit(s) run on one CPU core

This post is based on an excellent article from Red Hat: https://access.redhat.com/solutions/1445073 I’m a CFEngine developer, so this is a more work related post. CFEngine and Systemd In some performance critical situations, it makes sense to limit management software to a single CPU (core). We can do this using systemd and cgroups. CFEngine already provides systemd units on relevant platforms, we just need to tweak them. Tested using CFEngine 3.12 on CentOS 7. Read more

© Ole Herman Schumacher Elgesem 2019

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