Currently I'm spending a lot of time on automating complex application scenarios; during training I also starting learning about creating customized REST applications. The result was a tutorial which covers all stages of developing a small "RESTful" application:

1. Concept/Definition
2. Development
3. Tests and …

The last couple of years I spent a lot of time in managing Linux systems with Spacewalk and Red Hat Satellite 5. Because the application was superseded by the vendor, I investigated on migrations to the successor.

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Recently, I had to remove a SAN LUN on a physical Enterprise Linux system. The first step was to alter the multipath service configuration file (/etc/multipath.conf) and make the daemon reload its configuration:

1# vi /etc/multipath.conf
2...
3ESC ZZ
4
5# service multipathd reload

Afterwards, the device was removed …

Foreman, Katello and Red Hat Satellite 6 users have multiple possibilities to monitor infrastructure health. Beside the Foreman host, also managed systems and defined software content are worth monitoring.

Foreman dashboard

Foreman/Katello and Red Hat Satellite offer a dashboard with some widgets that can be used for …

GitLab can utilize LDAP to authenticate against a variety of directory services such as Microsoft Active Directory Domain Services or FreeIPA and Red Hat Identity Management. This post describes configuring and integrating into FreeIPA.

By clicking Identity > User Groups > Add within the FreeIPA interface, an …

Photon OS is minimalistic RPM-based Linux distribution which is focussed on running Docker containers. It was optimized for VMware platforms (Workstation, Fusion, vSphere, vCloud Air) - e.g. its Linux kernel offers a caching mechanism optimized for vSphere.

Another characteristic is the customized package manager tdnf …

Recently I found out that Red Hat Identity Management (IdM) and FreeIPA tend to forgot their global DNS configuration after some upgrades. In my case, the global DNS forwarder configuration was dropped forcing external lookups to fail:

1$ ipa dnsconfig-show
2---------------------------------
3Global DNS configuration …

The last couple of days I have been working on a new project I want to introduce: IcingaBusylightAgent.

It all began with a new telephony system in our office. Instead of using physical phones, my colleagues are now using softphones. In addition to this, a gadget called Busylight representing the instant messenger …