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 …

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/ …

Sometimes it happens that you lock out yourself from your Linux system. In the worst case, additional security concepts or conditions might hamper access to the system, for example:

• No root access
• System cannot be rebooted to reset the password in a chroot session
• No colleague with system access available

Recently I …

New HP Smart Array controllers built into a  HP Integrity machine are basically unconfigured. When running the EFI Shell, you will probably see the following message:

1HP Smart Array P800 Controller     (version 7.22)  0 Logical Drives
21785-Drive Array Not Configured
3     Run Smart Array Configuration Utility
4...
5 …

While registering a client system with a FreeIPA server I recently stumbled upon the following error message:

1# ipa-client-install
2...
3User authorized to enroll computers: admin
4...
5Kerberos authentication failed
6kinit: Cannot read password while getting initial credentials

After wasting quite a lot of time with …

Recently one of my vCenter Server Appliance (vCSA) 5.5 installations was unable to proceed logins anymore. After having a look at the storage consumption I saw that two partitions were filled up:

1# df -h /storage/{core,db}
2Filesystem      Size  Used Avail Use% Mounted on
3/dev/sdb1        20G   20G     0 100% …

After a couple of months or years plenty of storage is wasted on Windows systems and sometime it is not possible anymore to free space by using the well-known procedures. Recently I had this issue on a 5 year old system - the following steps did not help anymore:

• Executuing the Disk Cleanup utility
• Manual cleaning …

Recently I stumbled upon the following error message while creating a DRBD volume on CentOS 7:

1# drbdadm create-md r0
2initializing activity log
3NOT initializing bitmap
4Writing meta data...
5lk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directory
6New drbd meta data block successfully created …

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 …