Category Archives: UNIX/Linux

Arch Linux: package-query: error while loading shared libraries:

26 October 2019

 Didn’t install upgrades for a couple of weeks, today packages to be upgraded became over 100, so I run it. Upgrades on my Arch Linux are installed with a simple alias in the.bashrc: … alias osupgrade=”yaourt -Syua –noconfirm” … (seems eventually it’s time to change it to the alias osupgrade=”yay -Syua –noconfirm”) The error Usually,… Read More »

Debian: logrotate won’t rotate logs with an “unknown group ‘syslog'” error

9 October 2019

 We have an AWS EC2 with Debian and logrotate. One day its root partition was exhausted and when I started investigating it – found, that we have a bunch of files like /var/log/syslog.N.gz. At the same time by default logrotate creates a config file to rotate syslog log files: Thus, we must have only files… Read More »

Redis: main configuration parameters and performance tuning overview

10 September 2019

 Currently configuring Redis server as our backend caching service and during that wrote this post with some things to pay attention at in Redis config file. Shortly enough but with links to other posts or documentation. Let’s begin with the redis-benchmark utility. Will be installed alongside with Redis service, so can be used right after… Read More »

Redis: fork – Cannot allocate memory, Linux, virtual memory and vm.overcommit_memory

28 August 2019

 Currently, I’m configuring a Redis as a caching service for our application and during that, I faced with the question: do I need to set vm.overcommit_memory to the value 1, i.e. disable it – or not? The question is quite old for me, see The story, but only now I found time to get to… Read More »

Debian: unattended-upgrades – automatic upgrades installation with email notifications via AWS SES

23 May 2019

 A unattended-upgrades package performs automated upgrades installation on Debian/Ubuntu systems. It’s a Python script (1500 lines) located at /usr/bin/unattended-upgrade (and /usr/bin/unattended-upgrades is a symlink to the /usr/bin/unattended-upgrade). CentsOS/RHEL analog – yum-cron. Install it: The main config file is /etc/apt/apt.conf.d/50unattended-upgrades where upgrade types, email settings etc can be configured. Upgrades related schedules are done in the… Read More »

Linux: GPG-keys, Pass – passwords manager, and passwords import from the KeePass database

25 April 2019

 pass – a password manager for Linux/UNIX. Stores data in tree-based directories/files structure and encrypts files with a GPG-key. In Arch Linux present by default, in Debian can be installed using apt from default repositories: For macOS can be installed with Homebrew: The pass itself is just a bash-script: GPG keys management Creating GPG key… Read More »

Arch Linux: Albion Online – Unable to preload the following plugins:

14 April 2019

 Didn’t play in Albion Online for a while, but recalled about it and tried to play on my Arch Linux. It works fine from the Steam client, but I bought with a start package some time ago and can’t log in to Steam’s version with my old credentials. Okay – download game from the,… Read More »