OpenVPN connections can be established under Mac OS X using the free software Tunnelblick - I kept in mind. Using the most recent OS X version Mavericks this is a problem. The stable version of Tunnelblick is not ready yet for Mavericks which means that it is necessary to use beta version. Unfortunately those were not …

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There is no standard sensor that can be used with lm_sensors to get the temperature of the Raspberry Pi embedded board - what a pity! Fortunately for this function there is a dedicated command called vcgencmd which is already included in the Raspbian image. To make it work you will need to customize the LD library …

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Recently I was confused when I spotted several spam comments on my blog. After logging into the Wordpress administration page I saw the reason for this issue: 1Akismet has detected a problem. A server or network problem is preventing Akismet from working correctly. Oops - where did that come from? It seems like my …

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While importing the recent EPEL7 YUM repositories I stumbled upon the following error: 1# /usr/bin/spacewalk-repo-sync --channel epel-el7-x86_64 2> --url http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/ 3> --type yum -c epel-el7-x86_64 4Repo URL: http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/ 5ERROR: xz …

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It is possible that RHEL7 channels aren't available to Red Hat Satellite even though you're having a valid Red Hat Enterprise Linux subscription. The appropriate software channel (rhel-x86_64-server-7) is not part of the list of available channels - it also cannot be downloaded manually: 1# satellite-sync …

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While bringing my self-made ESXi hosts into service I saw that only one of two network cards was detected. The reasons for this issue was that VMware ESXi offers no driver for the second network card Intel 82579LM. What a pity. Fortunately I stumbled upon a blog which offers an adequate software packages which was …

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At about two years ago I replaced a lot of my hardware with more power-saving alternatives. My self-made NAS and hypervisor wer replaces by two HP ProLiant MicroServer G7 servers (N36L and N40L) - for a long time I was very happy with them. In the last months the amount of VMs increased and now the CPU and memory …

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Beside Linux systems also Oracle Solaris hosts can be managed using Spacewalk and Red Hat Satellite - a cool feature that is often forgotten. (Update: since Spacewalk 2.2 from 07/16/2014 this function is "deprecated" which means that it might be removed in one of the following releases) Bigger companies which …

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Using Raspbian it is possible to convert a Raspberry Pi into a full-featured Webserver with PHP support. Using SQLite the embedded web server is also capable of serving database-driven web applications. First of all the official Monkey APT repository needs to be included - this can done very easily by addind a line …

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It is possible that the following error message is displayed on client systems when software packages are distributed using Spacewalk, Red Hat Satellite or SUSE Manager: 1Error while executing packages action: empty transaction [[6]] This issue rests on the database of the management suite. After a while (or after a …

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