holmberd

How Nginx determines which server block to route the request through.

Nginx tests only the request’s header field Host to determine which server the request should be routed to. If its value does not match any server name, or the request does not contain this header field at all, then nginx will route the request to the default server, the first server block if no default is specified, or determine the default alphabetical order.

How does TLS SNI help to determine which SSL certificate to use.

TLS does not provide a mechanism for a client to tell a server the name of the server it is contacting. It may be desirable for clients to provide this information to facilitate secure connections to servers that host multiple 'virtual' servers at a single underlying network address.

holmberd

Go to the udev rules folder

• cd /etc/udev/rules.d

Pull down the file from the yubikey github

• sudo wget https://raw.githubusercontent.com/Yubico/libu2f-host/master/70-u2f.rules

Reboot, or run the following to reload your rules

• sudo udevadm control --reload

Refs:

holmberd

###### development tools
sudo apt-get install build-essential python-dev git nodejs-legacy npm gnome-tweak-tool openjdk-8-jdk

### Python packages
sudo apt-get install python-pip python-virtualenv python-numpy python-matplotlib

### pip packages

pip install django flask django-widget-tweaks django-ckeditor beautifulsoup4 requests classifier SymPy ipython

holmberd

Manually decorate a URL with the linker parameter for Google Tag Manager or Google Analytics

In the case where you manually want to decorate a link with the linker parameter, i.e. the link is not a valid anchor link, or the final tracking page is accessed by user in a non direct way: File Download, Extension Installation, ect...

Google Analytics

/**
 * Returns the Google Analytics tracker linker parameter.

holmberd

SSH Welcome banner with FIGlet

• sudo apt-get install figlet
• sudo touch /etc/update-motd.d/10-my-banner
• sudo chmod +x /etc/update-motd.d/10-my-banner

10-my-banner.sh:

#!/bin/sh

holmberd

AWS S3 Bucket - List files by date

With s3 ls

ls-s3.sh:

#!/bin/bash
DATE=$1 || $(date +%Y-%m-%d)
echo "List records for date $DATE"
aws s3 ls s3://bucket-name/directory/ | grep ${DATE}

holmberd

CELL_ALIVE_CHAR = '*'
CELL_DEAD_CHAR = '.'

class Location:
    def __init__(self, row_index, col_index):
        self.row = row_index
        self.col = col_index

class Cell:
    def __init__(self, state):

holmberd

/**
 * Conway's Game of Life
 *
 * The world of the Game of Life is an infinite two-dimensional orthogonal grid of square
 * "cells", each of which is in one of two possible states, alive or dead.
 *
 * Rules:
 *   1. Any live cell with fewer than two live neighbours dies, as if by underpopulation.
 *   2. Any live cell with two or three live neighbours lives on to the next generation.
 *   3. Any live cell with more than three live neighbours dies, as if by overpopulation.

holmberd

static get observedAttributes() {
    return ['height', 'width'];
  }

  get height() {
    return this.hasAttribute('height') && Number(this.getAttribute('height').replace('px', ''));
  }

  set height(val) {
    if (val) {

holmberd

/**
 * Conway's Game of Life
 *
 * The world of the Game of Life is an infinite two-dimensional orthogonal grid of square
 * "cells", each of which is in one of two possible states, alive or dead.
 *
 * Rules:
 *   1. Any live cell with fewer than two live neighbours dies, as if by underpopulation.
 *   2. Any live cell with two or three live neighbours lives on to the next generation.
 *   3. Any live cell with more than three live neighbours dies, as if by overpopulation.