Vadzim Ivanitski urlichLivonian

Docker Desktop Alternatives for MacOS with Intel chip

Docker CLI + QEMU + Minikube

Install qemu:

brew install qemu

OpeSSL Cheat Sheet

Get a certificate with a CRL

Getting the certificate from URI (the website itself)

openssl s_client -connect example.com:443 -servername example.com 2>&1 < /dev/null | sed -n '/-----BEGIN/,/-----END/p' > example.pem

Git Tips and Tricks

Autocorrection in Git

Suppose you want to check the status with git status but you type git stats by accident. Git tells you that 'stats' is not a valid command:

git stats
git: 'stats' is not a git command. See ‘git --help’.

Pulling images from Azure Container Registry on GitLab CI

How to use an image from Azure Container Registry as the base for GitLab Runner’s Docker executor.

Using Service Principal

Let's imagine we have image in ACR as follows jigurda.azurecr.io/namaespace/awesome-toolbox:1.0.1. This image is private and requires you to sign in to a private container registry. Let’s also assume that these are the sign-in credentials for your service principal:

Key	Example Value

Essential Commands

Note links

https://medium.com/@obohovyk/how-to-prepare-and-pass-linux-foundation-certified-system-administrator-lfcs-exam-bd4cad4f6c64
https://resources.linuxfoundation.org/LF+Training/LF_Training_WP_CertificationPrepGuide_October2018+(6).pdf
https://training.linuxfoundation.org/wp-content/uploads/2019/04/LFCS-Practice-Questions-v1.0.pdf \

Bash Best Practices and Tips

Coding convention is a just conventions. I am writing this gist as much for me, but I hope it may also be useful to others. Inspired by progrium/bashstyle and Bash Guide

Main Rules

All code goes in a function. Use the main function for runing script
Always double quote variables.

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

	# best practice: linux
	nano ~/.pgpass
	:5432::username:password
	chmod 0600 ~/.pgpass

	# best practice: windows
	edit %APPDATA%\postgresql\pgpass.conf
	:5432::username:password

	# linux

	apiVersion: batch/v1
	kind: Job
	metadata:
	name: runner
	namespace: bitbucket-runner
	spec:
	template:
	metadata:
	labels:
	accountUuid: bla-bla-bla