Category Archives: UNIX/Linux

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: [simterm] $ sudo apt -y install unattended-upgrades [/simterm] The main config file is /etc/apt/apt.conf.d/50unattended-upgrades where upgrade types, email settings etc can be… 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: [simterm] $ sudo apt install pass [/simterm] For macOS can be installed with Homebrew: [simterm] $ brew install pass [/simterm]… Read More »

Arch Linux: Albion Online – Unable to preload the following plugins: libSDL2-2.0.so.0

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 https://albiononline.com/ru/download,… Read More »

JetBrains Upsource: installation, configuration on Linux with NGINX and SSL and PyCharm integration

2 April 2019
 

 Upsource is a self-hosted service from JetBrains for code reviews by teams of developers which can be integrated with any IDE from JetBrains. Is a Java-based application with Apache Cassandra as a backend for storing data and indexes. Minima requirements – 8 GiB memory on a host – not surprise at all. Up to 10… Read More »

Kubernetes: running Minikube on Arch Linux

27 March 2019
 

 Minikube – a utility to run a Kubernetes cluster locally on your PC. It can use Virtualbox, VMware, Hyper-V etc hypervisors which will be used to create a virtual machine with a Kubernetes cluster. Minikube is a great tool for developers or DevOps engineers to test deployments/services etc without the need to create and configure… Read More »