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Let's Encrypt

Examples of getting certificates from Let's Encrypt working on Apache, NGINX and Node.js servers.

Obtain certificates

I chose to use the manual method, you have to make a file available to verify you own the domain. Follow the commands from running

git clone https://github.com/letsencrypt/letsencrypt
cd letsencrypt

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var request = require("request");
var fs = require("fs");
var output = "#cloudfront ip ranges\n";
request("https://ip-ranges.amazonaws.com/ip-ranges.json", function(err, res, body) {
    if (err) {
      console.error("error", err);
    }
    var j = JSON.parse(body);
    j.prefixes.forEach(function(item) {
      if (item.service ==='CLOUDFRONT') {

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Create the certificate:

$ sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/ssl/private/nginx-selfsigned.key -out /etc/ssl/certs/nginx-selfsigned.crt

Create a strong Diffie-Hellman group:

$ sudo openssl dhparam -out /etc/ssl/certs/dhparam.pem 2048

Create a new configuration snippet file for Nginx:

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Create the certificate:

$ openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/ssl/private/apache-selfsigned.key -out /etc/ssl/certs/apache-selfsigned.crt

Create a strong Diffie-Hellman group:

$ openssl dhparam -out /etc/ssl/certs/dhparam.pem 2048

Create an Apache Configuration Snippet with Strong Encryption Settings

binarweb

This tutorial is about setting up a Github account to commit (via SSH) to an existing/new repository and common commands to handle that repository.

1. Setting up git

• globally (recommended for one github account / OS user)

git config --global user.email "your_email@example.com"
git config --global user.name "Your Name"

• locally (recommended for multiple github accounts / OS user)

binarweb

Safest way to clean up boot partition - Ubuntu 14.04LTS-x64

Reference

Case I: if /boot is not 100% full and apt is working

1. Check the current kernel version

$ uname -r 

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<?php
require_once __DIR__ . '/../vendor/autoload.php';
use PhpAmqpLib\Connection\AMQPConnection;
use PhpAmqpLib\Message\AMQPMessage;


define('AMQP_DEBUG_FM', true);
$host = '127.0.0.1';
//$host = '192.168.2.3';

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Server online-status check with reporting to telegram

This simple script uses netcat to check if - for instance - a webserver is running on a server. If the service is not running, it utilizes the telegram bot API for sending a message to inform the operator of the server.

How to

1. Register the bot

Go to the BotFather bot-account and create a bot by writing /newbot. Then, copy the token.

2. Find your chat-id

Send a message to you newly created bot (you can find the link to your bot in the success message sent by BotFather).

binarweb

# Use this script to test that your Telegram bot works.
#
# Install the dependency
#
#   $ gem install telegram_bot
#
# Run the bot
#
#   $ ruby bot.rb
#

binarweb

Here are some examples on how to use Telegram bot api via CURL

Prerequisites

For getting messages in private chat with bot

• Create a bot using @BotFather, get it's token
• Start conversation with bot
• Run following curl command

curl https://api.telegram.org/bot/getUpdates | grep -Po '"from":{"id":.+?,'