Maxim N. Kostrikin mkostrikin

GPG and git on macOS

Setup

No need for homebrew or anything like that. Works with https://www.git-tower.com and the command line.

Install https://gpgtools.org -- I'd suggest to do a customized install and deselect GPGMail.
Create or import a key -- see below for https://keybase.io
Run gpg --list-secret-keys and look for sec, use the key ID for the next step
Configure git to use GPG -- replace the key with the one from gpg --list-secret-keys

screen ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty



screen -AmdS docker ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty
screen -r docker
# enter, then disconnect with Ctrl-a d
screen -S docker -p 0 -X stuff $(printf root\\r\\n)
screen -r docker

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

Setting up a SSL Cert from Comodo

I use Namecheap.com as a registrar, and they resale SSL Certs from a number of other companies, including Comodo.

These are the steps I went through to set up an SSL cert.

	'''
	binance.py

	To add crypto values add them to the <watchlist> dictionary:
	"ZECBNB": {
	"a": "ZEC",
	"b": "BNB",

	# Price coin
	"pc": [2, 4]

	# WRITING GOOD TESTS FOR (YOU\|EVERYONE) using TDD/BDD

	When I was looking how to program in Python, I've stumbled upon a lot of articles and most of them were mentioning
	that I should learn it using the TDD approach as well. TDD stands for 'Test-Driven Development'. Not only it helps you
	to maintain the project if needs improvements in the future, but to others as well.

	So, I've learned the Python basics and at the same time, I was implementing TDD. Some programmers ask you to first
	create the test case file (in our case with Ruby and Puppet, the 'spec//_spec.rb' file), create the tests cases, run
	those tests cases (they will fail naturally because you didn't put any code yet) and judging from what you want to achieve,
	you finally create your code to solve the tests cases and thus implement the feature your code would solve it.

	#!/bin/bash
	# Fetch 24-hour AWS STS session token and set appropriate environment variables.
	# See http://docs.aws.amazon.com/cli/latest/reference/sts/get-session-token.html .
	# You must have jq installed and in your PATH https://stedolan.github.io/jq/ .
	# Add this function to your .bashrc or save it to a file and source that file from .bashrc .
	# https://gist.github.com/ddgenome/f13f15dd01fb88538dd6fac8c7e73f8c
	#
	# usage: aws-creds MFA_TOKEN [OTHER_AWS_STS_GET-SESSION-TOKEN_OPTIONS...]
	function aws-creds () {
	local pkg=aws-creds

	# -- mode: ruby --
	# vi: set ft=ruby :

	PASSWORD_PATH = ".password"
	PASSWORD_ID_PATH = ".password_id"

	# Make sure to have installed vagrant-triggers plugin
	# > vagrant plugin install vagrant-triggers

	# After the first `vagrant up` stop the VM and execute the following steps

	# force HTTP to HTTPS - /etc/nginx/conf.d/nonssl.conf
	server {
	listen 80;
	server_name jira.example.com;
	access_log off;
	return 301 https://$server_name$request_uri;
	}

	# /etc/nginx/conf.d/jira.conf
	server {