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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …