Every Linux admin is familiar with the long time running through a large directory tree (with hundred of thousands of files and more) can take. Most are aware that if you re-run the same run-through, it will be shorter. This is caused by a short-valid filesystem cache, where the memory is allocated to other tasks,…
This blog is my extended memory, and as such, its task is to remind me things I tend to forget, saving me the time required to search them again. So here is another one of these things. The network settings syntax for RHEL8/OEL8 or any of their compatible systems, when you want to pass these…
My system provides DNS services, using dnsmasq, to several different subnets. I wish to log specific queries to different files – as I want to identify, and maybe even respond to certain DNS queries of the IoT network. The (excellent) utility dnsmasq is unable to split the logging into multiple log files, or filter logging…
There are two topics I would like to describe here, for later reference (by myself, of course. This blog is my extended memory). The first is about how to create a bootable ISO out of RHEL extracted ISO, and the other is about how to download only specific update, or make your own RHEL updates…
I have had a problem with RPI Zero. The system was working fine, and then it did not. I am using Raspbery Linux (Debian-based) with kernel 5.10.17+. Once a while (usually with network load) the system loses connectivity. Everything seems to be fine, if you have a serial/USB console there, but the wireless network fails….
All ZFS users are familiar with ‘zpool iostat’ command, however, it is not easily translated into Linux ‘iostat’ command. Using large pools with many disks will result in a mess, where it’s hard to identify which disk is which, and going to a translation table from time to time, to identify a suspect slow disk….
