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 …

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 …

Grafana offers the possibility to authenticate users against LDAP - make it quite easy to integrate the tool into existing directory services. I'm using FreeIPA as directory and authentication service in my lab and had to adjust some settings to authenticate Grafana access.

The first step is to alter the main …

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 …

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 …

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 …