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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If you're maintaining your system landscape with Spacewalk, Red Hat Satellite or SUSE Manager you might also see many old entries while having a look in the action list after a while: Every task triggered using the web interface is registered as action - after a while this list is growing rapidly. I'm not very familiar …

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A couple of days ago I spent a lot of time with Kickstart under Spacewalk and Red Hat Satellite and was looking for a possibility for creating Kickstart Trees for CentOS comfortably. Radomly I stumbled upon a blog article which served a useful script. That inspired me to create a more handy python script for that. …

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Sometimes it is sufficient to know which RPM GPG-Keys have been imported. You can get this information with the following command: 1# rpm -qa --qf '%{VERSION}-%{RELEASE} %{SUMMARY}\n' gpg-pubkey* 2c105b9de-4e0fd3a3 gpg(CentOS-6 Key (CentOS 6 Official Signing Key) <centos-6-key@centos.org>) …

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There are several OpenJDK versions for running Java applications under Enterprise Linux. This is adequate for the most applications but in some cases you might need the proprietary version by Oracle (e.g. because of support matrices of commercial third-party software). On the JRE webseite you can find tarball and RPM …

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A couple of days ago I stumbled upon the following error message while activating Fault Tolerance on a particular virtual machine: Replay is unavailable for the current configuration. First I wasted time by verifying the following topics: checking the VM configuration (vCPUs, OS support, disk provisioning,...) tested …

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