This gist will explain how to create a DNS-over-TLS bridge for the local network.
The server part will be based on: https://dfarq.homeip.net/dns-over-tls-protect-your-network-with-ubuntu/.
Install required packaages:
Jiab77
/ create-DNS-over-TLS-bridge-with-unbound-stubby-and-systemd-on-ubuntu-server-18.04.md
Last active
September 20, 2023 12:17
Create DNS-over-TLS bridge with unbound, stubby and systemd on Ubuntu Server 18.04
Jiab77
/ setup-DNS-over-TLS-with-systemd-on-ubuntu-18.04.md
Last active
September 18, 2022 20:48
Setup DNS-over-TLS with systemd on Ubuntu 18.04
Jiab77
/ upgrade-systemd-on-ubuntu-18.04.md
Last active
December 11, 2023 20:18
Upgrade systemd on Ubuntu 18.04
In this document, I will explain how to upgrade the default systemd version from 237 to 242.
The main reason why I needed this was related to the DNS-over-TLS that was not supported in the version 237 but available from version 242.
Later, when playing with Lynis, the security auditing tool, I then discovered that the version 242 was also providing the command systemd-analyze that is used by lynis to detect if existing systemd services are configured correctly in the security context, meaning that the existing services can run as expected but needs few or several changes in their configuration to make them safe without any exploitable attack surfaces.
You can try it once you've installed the version 242 of systemd that way:
Jiab77
/ how-to-fix-GRUB-boot-error-after-BootHole-patch.md
Created
August 5, 2020 09:57
How to fix GRUB boot error after BootHole patch
Once rebooted after patching, you will kindly greated by error: symbol 'grub_calloc' not found, entering rescue mode and way to boot the OS anymore...
The thing become even more horrible if you are using an encrypted partition plus LVM...
You can skip the steps 2 and 4 if you just have a normal partition scheme with no encryption or
LVM.
Jiab77
/ create-expandable-beowulf-cluster-with-slurm-mpich-and-mpi4py.md
Last active
January 29, 2024 15:08
Create an expandable beowulf cluster with SLURM, MPICH and MPI4PY
The goal of this gist is to explain how I have build a Beowulf cluster based on Raspberry Pi models 3B / 3B+ and 4B.
The cluster will be expendable with other device types. Any working computer can be added to the cluster.
Adding the following packages: Ansible, SSHFS, Slurm, MPICH and MPI4PY will give me to possiblity to run parallel computing tasks using all cluster nodes.
The final goal will be to create a low cost computing platform that can be managed with a web interface that I will create soon. Adding remote clients and compute nodes is also a part of this project.
Jiab77
/ how-to-control-boinc-workload-based-on-the-host-temperature.md
Last active
October 3, 2021 11:50
How to control BOINC workload based on the host temperature
I will explain here how to start and stop boinc depending on the host temperature.
I'm actually using a NUC to run BOINC and the Rosetta@Home project but this host is getting hot very quick and sometimes it will shutdown because of overheating.
To avoid this, I've requested the help of @AenBleidd, one of the BOINC developers. He gave me idea to use lm-sensors and CRON to run a script that will start / stop BOINC.
Jiab77
/ using-raspberry-pi-3-and-4-to-fight-against-covid-19-with-rosetta-at-home.md
Last active
April 27, 2020 02:51
Using Raspberry Pi 3B/3B+/4B to fight against COVID-19 with Rosetta@Home
The goal of this gist is to explain how I have build a Beowulf cluster based on Raspberry Pi models 3B / 3B+ and 4B.
The cluster will be expendable with other device types. Any working computer can be added to the cluster.
The cluster will be initially used to compute workunits from the Rosetta@Home project.
In this gist I will stay with Raspberry Pi nodes.
Just a quick gist to keep track of my research on this topic.
I'm using Ubuntu Server 18.04.2 as operating system.
Go to the download page and select your version: https://emby.media/linux-server.html
For my research, I've used two versions:
This gist will explain you how to enable an undocumented feature of PHP-FPM which will give a real-time performance stats.
Everybody knows the famous phpinfo() and the page it generates, right? Then the real-time PHP-FPM status page design is very similar.
Some informations from the top are not displayed to avoid security issues.