Create SELinux module for NRPE and check_fail2ban

May 28, 2016 · 5 min read · selinux ·

If you need to protect a Linux host against unauthorized access, fail2ban is a very handy service. The application scans log files of various services, automatically detects failed logins and blocks attacker's IP addresses. Especially on public hosts, it is essential to implement a protection like this on prominent …
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Short tip: OMD and Python error 'TypeError: 'frozenset' object is not callable'

May 27, 2016 · 1 min read · omd kurztipp ·

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When configuring and testing a Python Icinga plugin within an OMD site, I stumbled upon the following error recently:

1TypeError: 'frozenset' object is not callable

After some tests on other systems, I found out, that the Python library hashlib shipped with OMD seems to be faulty. Copying the system-wide …

vRealize Orchestrator for beginners, part 1: Introduction and installation

May 23, 2016 · 6 min read · vro ·

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With this article, I'm starting a blog series I'm really excited about. It's all about VMware's vRealize Orchestrator (vRO) - a very might tool than can simplify a VMware administrator's workaday life heavily. 🙂

What is vRealize Orchestrator? …

PHP 5.6 under Enterprise Linux 7 using Software Collections

May 17, 2016 · 3 min read ·

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By default, Enterprise Linux 7 is shipped with Apache 2.4.6 and PHP 5.4. For some current web applications this is way too old as development of PHP 5.4 stalled in fall 2015.

During the product life cycle, Red Hat offers 10 to 13 years (Extended Support) maintenance for all packages being part of the distribution - …

Enterprise Linux 7 and Oracle-related kernel parameters

May 13, 2016 · 3 min read ·

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When running Oracle databases under Linux, some additional kernel parameters need to be set. Oracle lists these parameters in the appopriate documentation - e.g. for the most recent version 12c: [click me!]

Especially for Enterprise Linux 7 there is a dedicated profile for the tuned service (RPM package …

Red Hat Enterprise Linux 6.8 released

May 11, 2016 · 3 min read ·

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Yesterday Red Hat released the 8th update of Red Hat Enterprise Linux 6. The changes have been documented in the release and technical notes:

Release Notes: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.8_Release_Notes/index.html
Technical Notes: …

Short tip: Changed Owncloud CardDAV/CalDAV URLs

Apr 26, 2016 · 1 min read · kurztipp ·

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Recently I had issues with configuring CardDAV-Sync and CalDAV-Sync along with Owncloud after a fresh Android installation. Specifying the well-known URLs just produced several error messages inside the app:

https://my-server.tld/owncloud/remote.php/caldav/principals/USER/ …

ASUS P9D-M, ASMB7-IKVM and false vCenter alarms

Apr 20, 2016 · 3 min read ·

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I was puzzled when I saw that the ESXi hosts of my new lab are generating critical CPU fan errors. Strange, I'm sure I mounted the fan correctly - otherwise the system would have been shutdown automatically to prevent serious damage. 🙂

I had a look at the IPMI web interface and saw that a fan is detected - but why is …

Compile Python applications automatically for Windows using GitLab CI

Apr 20, 2016 · 5 min read · gitlab powershell ·

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Some time ago I wrote about GitLab Continuous Integration and explained how code changes can be catched up to create or update software packages on remote systems. In order to communicate with the development systems, GitLab utilizes agents that are availble for plenty of platforms - including Microsoft Windows, we …
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New VSAN 6.2 home lab

Apr 20, 2016 · 7 min read · vsan ·

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In 2008 I started working as VMware administrator and thus also began using vSphere at home. You might know this - as an IT person you want to have a lab at home that can be compared with the infrastructure at work. 🙂

The hardware half-life is quite short and especially when virtualizing workloads you can reach memory …