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 … Read more
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“: # crm resource start apache … Read more
When installing Spacewalk 2.7 under CentOS 7.4 along with PostgreSQL 9.2.23, I recently stumbled upon the following error:
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 … Read more
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 … Read more
To find out the WWN port name of a HBA under Linux, reading the port_name file is sufficient – e.g. for all HBAs: $ cat /sys/class/scsi_host/host*/device/fc_host/host*/port_name 0x2002f6dc44b8e2b6 0x2001f6dc44b8e2b6
I’m currently working on a blog post series about Foreman, Katello and Red Hat Satellite 6. Here’s the link collection for beginners: “Introduction and installation” (also published on Pro-Linux ) “Products, Repositories and Content Views” (also published … Read more
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: # vi … Read more
Changed Block Tracking (CBT) enables creating incremental backups of virtual machines. In comparison with conventional VM backups, guest hard drives are synchronized. Using CBT, the hypervisor detects changed blocks and the backup software will only … Read more
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 … Read more
