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If I had to guess I would say that more than 90% of AMD Ryzen based builds use Single Rank memory sticks. Finding any information regarding how Dual Rank DDR4 perform, how they react to overclock or even worse, what memory settings are the best is pretty much mission impossible. Since I use Dual Rank DDR4, because, face it, it is 2017 and 16 GB of RAM does not cut it anymore, I had to dig in unexplored territories to find out what the best settings are.

LEDE, formerly OpenWRT, is a free open source Linux based operating system aimed at networking hardware. Every time the system is upgraded to a newer version using the so called “Sysupgrade BIN” image every package the user manually installed gets lost; this makes the upgrade process very tedious especially if one does not properly write down all the customization he has made. I don’t use many custom packages but QoS, USB support and vnstat are a must have.

Zabbix should theoretically be able out of the box to send alerts via XMPP. For some reason this functionality does not work as intended, luckily it is possible to specify a custom script to send alerts; combining the aforementioned script with the Perl library sendxmpp is the easiest solution to solve the issue. $ yum install sendxmpp echo “$3” | /usr/bin/sendxmpp -u <sender_user> -j <sender_domain> -p <sender_user_password> -s “$2” -i "

Zabbix is an open source resource and network monitoring system, more info: zabbix.com. The official wiki is missing some important bits regarding the installation of the tool on CentOS 7 systems. First of all, let’s add Zabbix repository and then proceed to with the installation of Zabbix and some required dependecies: $ rpm -ivh http://repo.zabbix.com/zabbix/3.4/rhel/7/x86_64/zabbix-release-3.4-1.el7.centos.noarch.rpm $ yum install mariadb mariadb-server httpd zabbix-server-mysql zabbix-web-mysql setroubleshoot .:. Configure MariaDB Login to MariaDB shell, change root’s password, create a new database for Zabbix and add a new user:

Configuring this piece of poorly documented bloated shit Mozilla came up with was a huge pain in the ass, so excuse the colored language but I am fucking pissed. The idea was to finally implement a system to synchronize Firefox’s bookmarks across multiple devices without giving Mozilla all my personal data. After some minutes spent researching the subject on the interweb I found out the synchronization system is a huge clusterfuck comprised of multiple components:

Today I had Ansible reporting an error on one of my CentOS machines while performing the usual upgrade procedure. I SSH’d into the host to check what was wrong and run “yum clean all && yum update” manually just to be greeted with the following error: rpmdb: PANIC: fatal region error detected; run recovery error: db3 error(-30974) from dbenv->open: DB_RUNRECOVERY: Fatal error, run database recovery error: cannot open Packages index using db3 - (-30974) error: cannot open Packages database in /var/lib/rpm CRITICAL:yum.

NFS on Fedora

NFS allows to share files and folders over network and is much much faster than samba while using way less resources. To setup a NFS server on Fedora 26 install: $ dnf install nfs-utils Shared directories are listed in the following configuration file: vi /etc/exports"> --- # Syntax # <path> <ipaddr>(<option>) /home/user/Public,sync) More information can be found here: Fedora NFS administration guide. In the above example, the the directory ‘/home/user/Public’ can be accessed by every client in the same LAN with read-only permissions.

AMD Ryzen on Linux

Finally we have some new hardware worth writing of – and also spending money on. I have been using an AMD Ryzen 7 1700X based build for some time now and so far I am really liking it, the CPU is marvelous considering the pricetag and felt like a worthwhile upgrade from the Xeon E3-1241v3 I was using before; it is basically twice the cores clocked at pretty much the same speed.

Handbrake cannot be installed from default repos nor rpmfusion, to get it on Fedora 25 there are two other options: 1. use negativo17 third party repository; 2. compile from source. The first option is, but that is my opinion, subpar because I don’t trust third party repositories; option two is what is left. Download the source code from git and install some dependencies: $ git clone https://github.com/HandBrake/HandBrake.git $ sudo dnf install dbus-glib-devel gstreamer1-devel gstreamer1-plugins-base-devel intltool libgudev1-devel libnotify-devel webkitgtk3-devel libgudev-devel dbus-glib-devel webkitgtk3-devel gstream-devel libnotify-devel gstreamer1-devel gstreamer1-plugins-base-devel lame-devel opus-devel fribidi-devel libass-devel libtheora-devel x264-devel nasm Like I do with every other program I like to keep as much up to date as possible, I have a small script to take care of compilation, installation and upgrade processes for me.

OMEMO is the new-ish state of the art end-to-end encryption XMPP protocol extension, Gajim support it via a plugin but making it work on Gentoo is not straightforward at all. Gajim’s OMEMO plugin requires python-axolotl package to work, since that is not present in Gentoo’s repositories it must be installed from source. Before doing so a couple of dependencies must be installed first: $ emerge -a dev-python/protobuf-python $ chmod o+w /usr/lib64/python3.