Mike dot-mike

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

Example

Docker compose as a systemd unit

Create file /etc/systemd/system/docker-compose@.service. SystemD calling binaries using an absolute path. In my case is prefixed by /usr/local/bin, you should use paths specific for your environment.

[Unit]
Description=%i service with docker compose
PartOf=docker.service
After=docker.service

When you create a npm package, remember it might be used in a browser or a server, or even a command line utility… For each package you create, please pay attention at what it will be used for:

Is it going to be used as a dependency to a nodejs application that is not bundled? (e.g. command line utilities)
Is it going to be used as a dependency to a nodejs application that is bundled? (e.g. AWS Lambdas)
Is it going to be used as a dependency to a browser application (always bundled)?.

In cases 2) and 3) you want to allow for tree shaking.
In cases 1) and 2) you want to benefit from the "ES6"/"ES next" features supported natively by nodejs.
In case 3) you also want to benefit from the native support of "ES6" from your browser.

Using a Yubikey 4 on Windows

These are my notes on how to set up GPG with the private key stored on the hardware Yubikey. This will reduce the chances of your GPG private key from being stolen, and also allow you to protect other secrets such as SSH private keys.

It's just some notes and a partial worklog for now, but I may turn it into a full blog post later.

Using a Yubikey 4 on Windows
Software needed

Setting up email with SMTP on Ubuntu/Debian Servers

I used to sift trough my shell history and bookmarks every time I set up a new testing server in order to be able to send mails. So this should help...

Be aware don't use ssmtp anymore. It's unmaintained and has been removed from Debian and Ubuntu will most definitely follow suit.

Install msmtp

Introduction

The objective of these instructions is to create a complete Arm64 OS (Userland and Kernel) using Debian Debootstrap and RPI-Update for use on the Raspberry Pi 3 and 4.

Prerequisites:

An existing Debian/Raspbian system (any architecture will do)
An empty SD card formatted as per a standard Raspbian installation mounted to /mnt/sd on the build system
- 1st Partition 0-256MB = FAT32 (Mount to /mnt/sd/boot)
- 2nd Partition 256MB+ = EXT4 (Mount to /mnt/sd)

Set-up basic Debian system

Export running or paused Container:

Export

docker export <dockernameortag> | gzip > mycontainer.tgz

Load

gunzip -c mycontainer.tgz | docker load

	#!/bin/bash

	# This script allows you to chroot ("work on")
	# the raspbian sd card as if it's the raspberry pi
	# on your Ubuntu desktop/laptop
	# just much faster and more convenient

	# credits: https://gist.github.com/jkullick/9b02c2061fbdf4a6c4e8a78f1312a689

	# make sure you have issued

	#! /bin/bash

	# NEWLY ADDED BACKUP FUNCTIONALITY IS NOT FULLY TESTED YET, USE WITH CARE, ESPECIALLY DELETION
	# Developed for DSM 6 - 7.0.1. Not tested on other versions.
	# Steps to install
	# Save this script in one of your shares
	# Edit it according to your requirements
	# Backup /usr/syno/share/nginx/ as follows:
	# # cd /usr/syno/share/
	# # tar cvf ~/nginx.tar nginx

	#Start docker
	docker-compose up -d --build --force-recreate

	#Import database
	docker exec -i [container] mysql -u[user] -p[pass] [database] -v < [path_of_sql_import]

	# Backup
	docker exec CONTAINER /usr/bin/mysqldump -u root -pPASSWORD DATABASE > backup.sql
	docker exec CONTAINER /usr/bin/mysqldump -u root -pPASSWORD DATABASE \| gzip > backup.sql.gz
	docker exec CONTAINER /usr/bin/mysqldump -u root -pPASSWORD DATABASE \| bzip2 > backup.sql.bz2