It is a common procedure to use templates ("golden images") when deploying virtual machines. Recently I had an issue when deploying SLES machines - newly registered systems within SUSE Manager replaced older one. The management agent was installed within the template.

For classic systems (registered via RHNSD …

Recently I had some issues with a Linux cluster running Corosync, Pacemaker and Apache. I was unable to run the redskin as ressource - starting always failed with "invalid parameter":

 1# crm resource start apache
 2# crm status
 3...
 42 nodes configured
 55 resources configured
 6
 7Online: [ deb9-node2 …

When installing Spacewalk 2.7 under CentOS 7.4 along with PostgreSQL 9.2.23, I recently stumbled upon the following error:

1# spacewalk-setup
2* Setting up SELinux..
3** Database: Setting up database connection for PostgreSQL backend.
4** Database: Installing the database:
5** Database: This is a long process that is …

Every Linux user knows the following scenario: a running process should be moved to another terminal. An example: an application update takes longer than expected and the status should be monitored on the go in GNU Screen. It's just nasty, if you forgot to prepare this prior to that.

Happily, there are plenty tools for …

When reinstalling one of my homelab vSphere cluster nodes I noticed again, that the Intel driver ixgbe is not part of the ESXi base image. This driver is needed for my Supermicro mainboard X10SDV-TP8F in order to enable 10G networking.

On the VMware download section there is an appropriate download for ESXi 6.0. …

To find out the WWN port name of a HBA under Linux, reading the port_name file is sufficient - e.g. for all HBAs:

1$ cat /sys/class/scsi_host/host*/device/fc_host/host*/port_name
20x2002f6dc44b8e2b6
30x2001f6dc44b8e2b6

I'm currently working on a blog post series about Foreman, Katello and Red Hat Satellite 6.

Here's the link collection for beginners:

1. "Introduction and installation" (also published on Pro-Linux [button size="xsmall" color="red"]german[/button])
2. "Products, Repositories and Content …

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 …

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 …