GRUB2 password protection, secure Ubuntu boot loader, prevent unauthorised boot menu changes, enhance system security. In previous posts in this blog I have explained how to protect the system by disk encryption with a password retrial from the TPM. In another post, I have given some wider overview of system security and protection, but there…
I’ve been using a WordPress Docker for some time now. My Docker is invoked through the docker-compose toolset, and it generally functions well. However, at times, specific configurations are needed. For instance, when adjusting the PHP file size limitation or adding mod_headers to address CORS issues on WordPress. The key is to override the Docker…
With the migration of Enterprise Linux to ‘chronyd’ ntp clock toolset, some of the more common commands were deprecated, and do not exist anymore. In this article I will go over the most common uses I have in the context of NTP, and how to address them using ‘chronyc’ command line. Perform ‘ntpdate’ command A…
I encountered an intriguing issue recently after replacing my motherboard. Some block devices underwent a change in their order, causing /dev/sda to appear as /dev/sdy due to a modification in the PCI-e enumeration. This change, though seemingly insignificant, led to an unexpected consequence. Since the disk was subject to a specific mdadm filter, its altered…
ZFS version 2.1.11 is supposed to work correctly with Oracle UEK 7. However, on update (and later – a reboot) – it broke. The driver cannot build using dkms, and the error message is something like this: If you look into /boot/config-`uname -r` output, and look for CONFIG_MODULES string, you will indeed find that it…
A common tool in use when needing a console access to a remote server is the IPMI. There are multiple names and implementations – HPE’s ILO, Dell’s iDrac, Lenovo IMM, and so on. This interface can be configured – both network settings and user access credentials, when having a BIOS access, however – a question…
