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 …

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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/ …

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Especially when playing around with multiple vCenter and VSAN versions in a lab, it might be necessary to rebuild a VSAN cluster. In this scenario, it is sometimes also necessary to also reset the SSD and HDD drives used by VSAN. In my lab I'm often resetting the whole VSAN cluster to have a clear starting point - …

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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 …

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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... 5Press …

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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 …

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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% /storage/core 4/dev/sdb3 …

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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 …

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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 …

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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 …

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