Short tip: Please reserve memory by passing 'crashkernel=X@Y' parameter to the kernel

Apr 29, 2015 · 1 min read · kurztipp ·

While configuring kdump on a system I recently stumbled upon the following error:

1Please reserve memory by passing "crashkernel=X@Y" parameter to the kernel

However, the parameter crashkernel was mentioned in the GRUB configuration file and kernel commandline:

1$ grep crashkernel /proc/cmdline
2ro …

Store kernel dumps using kdump on remote machines

Apr 28, 2015 · 3 min read ·

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If the Linux kernel crashes it is possible to create a memory image (also called vmcore) using a mechanism called kdump. Especially, this is useful if you plan to engage support to fix the reason for the issue. By default, the vmcore is stored under /var/crash. But if the kernel is not able to access the storage …
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Spacewalk 2.3 released

Apr 16, 2015 · 2 min read · red-hat-satellite spacewalk suse-manager ·

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After Red Hat Satellite 5.7 was released 3 months ago Spacewalk version 2.3 was published on 14th of april 2015 after 9 months of development. Like the commercial spin-off the recent management suite also offers a more modern web-interface. With version 2.2 this interface's user experience was overhauled by HTML5, …
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Red Hat Satellite 5.7 released

Jan 16, 2015 · 5 min read · red-hat-satellite spacewalk ·

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This week Red Hat Satellite 5.7 was released. With the ninth update of the 5.x tree many improvements from the Spacewalk development were applied.

New web interface

Short tip: Install Microsoft fonts under Enterprise Linux

Nov 14, 2014 · 1 min read · kurztipp ·

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Some applications still require Microsoft fonts under Linux. Some Linux distros dropped those fonts because of license difficulties. Microsoft offers those fonts for free but redistributing them is prohibited by the used license. Debian-based distros offer a package msttcorefonts-installer which downloads and extracts …
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Short tip: osad: Unable to connect to the host and port specified (EL6.6 + EL7)

Nov 1, 2014 · 2 min read · red-hat-satellite kurztipp spacewalk suse-manager ·

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Hint from january 2015: the bug has been fixed in the meantime.

I found out that it is currently (11/01/2014) impossible to run osad (Open Source Architecture Daemon) with SELinux enabled on EL6.6 and EL7 systems. The following error message can be seen while starting the service:

 1# service osad restart
 2Shutting …

Red Hat Enterprise Linux 6.6 released

Oct 15, 2014 · 2 min read ·

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Yesterday Red Hat released another update of its Red Hat Enterprise Linux major release 6: 6.6. Like for the minor updates before many optimizations and some "technical previews" were implemented.

The changes have been documented well in the release and technical notes:

Release notes: …

DELL OpenManage Integration Virtual Appliance update problems

Oct 7, 2014 · 3 min read · dell ·

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DELL offers an Linux appliance based on CentOS 5 for customers using VMware products. This appliance is called "DELL OpenManage Integration for VMware vCenter Appliance" and integrates seamless in VMware vCenter Server (or the appliance). It can be used for monitoring physical servers and also allows …
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CentOS Dojo Cologne 2014

Aug 8, 2014 · 2 min read · conference red-hat-satellite spacewalk suse-manager ·

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This week the first official CentOS Dojo in Cologne was taking place. CentOS Dojos are one-day events where administrators and developers can exchange knowledge. Talks about recent topics are always part of these events.

inovex GmbH kindly features the event by providing their rooms and hearty catering. Beside coffee …

Short tip: YUM error: 'xz compression not available'

Jul 8, 2014 · 1 min read · kurztipp ·

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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 …