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bangadennis / System Design.md
Created September 2, 2020 18:06 — forked from vasanthk/System Design.md
System Design Cheatsheet

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

  1. Clarify and agree on the scope of the system
  • User cases (description of sequences of events that, taken together, lead to a system doing something useful)
    • Who is going to use it?
    • How are they going to use it?
@bangadennis
bangadennis / readme.md
Created October 18, 2018 16:42 — forked from jgamblin/readme.md
Bot that posts SSH logins to slack.

SSH Slackbot

This is a simple slackbot to post successful SSH logins to a slack channel to help you keep track of server access.

Step 1

Create an incoming webhook for your slack community.

Step 2

Create /etc/ssh/sshslack.sh

@bangadennis
bangadennis / validate_credit_card.js
Created June 16, 2017 08:29 — forked from DiegoSalazar/validate_credit_card.js
Luhn algorithm in Javascript. Check valid credit card numbers
// takes the form field value and returns true on valid number
function valid_credit_card(value) {
// accept only digits, dashes or spaces
if (/[^0-9-\s]+/.test(value)) return false;
// The Luhn Algorithm. It's so pretty.
var nCheck = 0, nDigit = 0, bEven = false;
value = value.replace(/\D/g, "");
for (var n = value.length - 1; n >= 0; n--) {
@bangadennis
bangadennis / luhn.js
Last active June 16, 2017 08:29 — forked from ShirtlessKirk/luhn.js
Luhn validation algorithm
/**
* Luhn algorithm in JavaScript: validate credit card number supplied as string of numbers
* @author ShirtlessKirk. Copyright (c) 2012.
* @license WTFPL (http://www.wtfpl.net/txt/copying)
*/
var luhnChk = (function (arr) {
return function (ccNum) {
var
len = ccNum.length,
bit = 1,
@bangadennis
bangadennis / db_backup.sh
Created March 28, 2017 08:31 — forked from bendavis78/db_backup.sh
A simple database backup / rotation / prune script
#!/bin/bash
# for use with cron, eg:
# 0 3 * * * postgres /var/db/db_backup.sh foo_db
if [[ -z "$1" ]]; then
echo "Usage: $0 <db_name> [pg_dump args]"
exit 1
fi
@bangadennis
bangadennis / .bash_profile
Created February 7, 2017 17:38 — forked from bettysteger/.bash_profile
make your terminal beautiful! (git branch color etc)
# terminal colors, Git branch in prompt, where am i
export CLICOLOR=1
export TERM=xterm-color
export LSCOLORS=ExFxCxDxBxegedabagacad
parse_git_branch() {
git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\ →\ \1/'
}
export PS1='\[\e[1;37m\][\[\e[1;35m\]\u\[\e[1;37m\]:\[\e[1;36m\]\w\[\e[1;33m\]$(parse_git_branch)\[\e[1;37m\]]$ \[\e[0m\]'
@bangadennis
bangadennis / setenv.sh
Created January 31, 2017 01:57 — forked from terrancesnyder/setenv.sh
./setenv.sh - example setenv.sh with defaults set for minimal time spent in garbage collection
#! /bin/sh
# ==================================================================
# ______ __ _____
# /_ __/___ ____ ___ _________ _/ /_ /__ /
# / / / __ \/ __ `__ \/ ___/ __ `/ __/ / /
# / / / /_/ / / / / / / /__/ /_/ / /_ / /
#/_/ \____/_/ /_/ /_/\___/\__,_/\__/ /_/
# Multi-instance Apache Tomcat installation with a focus
# on best-practices as defined by Apache, SpringSource, and MuleSoft
@bangadennis
bangadennis / gist:37885b71bb6f8edcd9688c3d98f47fdd
Created December 8, 2016 04:15 — forked from pitch-gist/gist:2999707
HTML: Simple Maintenance Page
<!doctype html>
<title>Site Maintenance</title>
<style>
body { text-align: center; padding: 150px; }
h1 { font-size: 50px; }
body { font: 20px Helvetica, sans-serif; color: #333; }
article { display: block; text-align: left; width: 650px; margin: 0 auto; }
a { color: #dc8100; text-decoration: none; }
a:hover { color: #333; text-decoration: none; }
</style>
@bangadennis
bangadennis / useful_pandas_snippets.py
Created July 17, 2016 10:52 — forked from bsweger/useful_pandas_snippets.md
Useful Pandas Snippets
#List unique values in a DataFrame column
pd.unique(df.column_name.ravel())
#Convert Series datatype to numeric, getting rid of any non-numeric values
df['col'] = df['col'].astype(str).convert_objects(convert_numeric=True)
#Grab DataFrame rows where column has certain values
valuelist = ['value1', 'value2', 'value3']
df = df[df.column.isin(value_list)]
@bangadennis
bangadennis / gunicorn_start.bash
Created December 12, 2015 08:33 — forked from postrational/gunicorn_start.bash
Example of how to set up Django on Nginx with Gunicorn and supervisordhttp://michal.karzynski.pl/blog/2013/06/09/django-nginx-gunicorn-virtualenv-supervisor/
#!/bin/bash
NAME="hello_app" # Name of the application
DJANGODIR=/webapps/hello_django/hello # Django project directory
SOCKFILE=/webapps/hello_django/run/gunicorn.sock # we will communicte using this unix socket
USER=hello # the user to run as
GROUP=webapps # the group to run as
NUM_WORKERS=3 # how many worker processes should Gunicorn spawn
DJANGO_SETTINGS_MODULE=hello.settings # which settings file should Django use
DJANGO_WSGI_MODULE=hello.wsgi # WSGI module name