An advantage of using Kerberos along with SSH is that it makes entering passwords obsolete when establishing connections. Unfortunately this is not working out of the box under OS X in the first place: 1$ kinit cstan@STANKOWIC.LOC 2cstan@STANKOWIC.LOC's password: 3 4$ klist 5Credentials cache: API:xxx 6 Principal: …

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The Python Package Index (PyPI) website offers plenty of Python module source codes. To install these modules, it is needed to download and extract the archive and execute an installation script afterwards. Using the pip (pip installs packages) package manager, this process can be automated - e.g. for the nagiosplugin …

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If you plan to restrict utilizing the root user under Linux, it is most likely that you will create sudo rules to allow certain users to execute administrative utilities. There are plenty of tools you really should not be able to run as privileged users - some examples: screen, tmux The famous terminal multiplexers GNU …

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If you're testing the nightly builds of Katello, you might come into a situation where it is advisable to re-install the software completely. As the particular installation steps are automated using Puppet, there is also a dedicated utility which automates uninstalling the software in a clean way: katello-remove. This …

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After upgrading Katello recently, I stumbled upon the following error when accessing the administration interface: The web server protocol told me that a database update might causes this issue: 1# tail /var/log/httpd/foreman-ssl_error_ssl.log 2[Wed Aug 17 09:42:51.536914 2016] [:error] [pid 3178] [remote …

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The middle mouse button offers extended functionality in the most software - e.g. it can be used in web browsers to open or close tabs. When using the integrated trackpad of a MacBook or the Apple Magic Mouse this will not work due to missing mouse buttons. To enable this functionality under OS X there is a free …

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In my last article I focussed on Icinga 2 and the new configuration utility Icinga Director. I mentioned that Icinga Director can be used to link Icinga to pre-existing Configuration Management Database (CMDB) systems to simplify data import. In this article we will create a little "dummy CMDB" with MySQL and …

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Icinga2 is a very powerful monitoring system that can be used optionally with the new user interface Icinga Web 2. In comparison with Icinga 1.x, those tools have been developed completely from scratch - they have nothing in common with the legacy software stack. This year, a configuration utility named Icinga Director …

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Rcently I packaged the software scponly for Enterprise Linux using rpmbuild and stumbled upon an error message: 1$ cd ~/rpmbuild/SPECS 2$ rpmbuild -ba scponly.spec 3checking for libgiertz... 4... 5/usr/bin/install -c -o 0 -g 0 scponly /home/cstan/rpmbuild/BUILDROOT/scponly-4.8-1.el7.centos.x86_64/usr/bin/scponly …

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System administrators know requirements like this - a dedicated server needs to be deployed for a new application. In order to enable owners to maintain their application they need permissions to modify relevant configuration files. In this scenario, sudo rules are often configured in a way to enable file modifications …

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