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How to create an HTTPS certificate for localhost domains

This focuses on generating the certificates for loading local virtual hosts hosted on your computer, for development only.

Do not use self-signed certificates in production ! For online certificates, use Let's Encrypt instead (tutorial).

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

Vue: Pass Slots through from Parent to Child Components

The Situation

We've got some components A, B and C which provide different slots.

const A = {
  template: `<div><slot name="a">Default A Content</slot></div>`
}

const B = {

Dumping

Use the directory output format because it works better with incremental backups and is most flexible when restoring.

Do not compress because the overwhelming majority of the contents of the MAAS database is already compressed images. For a MAAS installation with one image the saving due to compression was only 1.7% but the dump took noticeably longer. With more images the ratio of already-compressed to not-compressed data goes up, and the savings will likely drop.

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

Generate private key (.key)

# Key considerations for algorithm "RSA" ≥ 2048-bit
openssl genrsa -out server.key 2048
    
# Key considerations for algorithm "ECDSA" ≥ secp384r1
# List ECDSA the supported curves (openssl ecparam -list_curves)
openssl ecparam -genkey -name secp384r1 -out server.key

	#!/bin/sh

	apt-get -y install git bc
	git clone https://github.com/letsencrypt/letsencrypt /opt/letsencrypt
	mkdir /etc/letsencrypt

	# Put this in your ~/.gitconfig or ~/.config/git/config
	# Windows users: "~" is your profile's home directory, e.g. C:\Users\<YourName>
	[user]
	name = Your Full Name
	email = [email protected]
	[color]
	# Enable colors in color-supporting terminals
	ui = auto
	[alias]
	# List available aliases

	function formatBytes(bytes,decimals) {
	if(bytes == 0) return '0 Bytes';
	var k = 1024,
	dm = decimals \|\| 2,
	sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],
	i = Math.floor(Math.log(bytes) / Math.log(k));
	return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
	}

	// Usage:

	#include "Dactyl.h"
	#include "action_layer.h"
	#include "eeconfig.h"

	extern keymap_config_t keymap_config;
	#define _QWERTY 0
	#define _NUMLAYER 1
	enum custom_keycodes {
	QWERTY,
	NUMLAYER