Recently I needed access to a HP Management Processor (MP) without knowing the appropriate IP address. A possibility is to utilize a serial connection to the MP – but this is kinda complicated if you … Read more
Puppet agents force dozens of errors: “Could not set ‘file’ on ensure: incorrect header check”
Recently I had the problem that my homelab’s Linux machines managed by Puppet were generating dozens of error messages when updating the catalog:
Short tip: Manage cloned systems with SUSE Manager
It is a common procedure to use templates (“golden images“) when deploying virtual machines. Recently I had an issue when deploying SLES machines – newly registered systems within SUSE Manager replaced older one. The management … Read more
Apache Guacamole, Part 1: Basics and installation under CentOS 7
Readers of my blog know that I have been maintaining a homelab for a couple of years. I really like leveraging products I’m focussing on in my working hours also at home. In other words: I like … Read more
FirewallD in a nutshell 101
With FirewallD, some Linux distributions introduce a new default firewall differing heavily from previous interfaces. This post focusses the basic concept and some practical examples. A major difference is that the firewall now supports changes … Read more
Short tip: Apache and Pacemaker: invalid parameter
Recently I had some issues with a Linux cluster running Corosync, Pacemaker and Apache. I was unable to run the redskin as ressource – starting always failed with “invalid parameter“: # crm resource start apache … Read more
SUSE Linux Expert Days 2018 Frankfurt
Last Tuesday, one of the SUSE Linux Expert Days 2018 events was taking place in Frankfurt. Every year, SUSE arranges plenty of those events in order to update customers with talks and demonstrations about new … Read more
Authenticate Spacewalk users with FreeIPA
A fresh Spacewalk installation usually defines user accounts in a local manner – including permissions. Especially for bigger system landscapes with requirements such as Single Sign-on, this is not a practical solution. Fortunately, Spacewalk and … Read more
CentOS 7.4, Spacewalk 2.7 and Reposync: Internal Server Error
After my last Spacewalk 2.7 installation I had the problem that synchronising repositories using the web interface failed with the following error:
Short tip: CentOS 7.4, PostgreSQL 9.2.23 and Spacewalk 2.7: Could not install database
When installing Spacewalk 2.7 under CentOS 7.4 along with PostgreSQL 9.2.23, I recently stumbled upon the following error: