vasanthk

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?

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

julionc

How to install PhantomJS on Ubuntu

Version: 1.9.8

Platform: x86_64

First, install or update to the latest system software.

sudo apt-get update
sudo apt-get install build-essential chrpath libssl-dev libxft-dev

ziadoz

#!/usr/bin/env bash
# https://developers.supportbee.com/blog/setting-up-cucumber-to-run-with-Chrome-on-Linux/
# https://gist.github.com/curtismcmullan/7be1a8c1c841a9d8db2c
# https://stackoverflow.com/questions/10792403/how-do-i-get-chrome-working-with-selenium-using-php-webdriver
# https://stackoverflow.com/questions/26133486/how-to-specify-binary-path-for-remote-chromedriver-in-codeception
# https://stackoverflow.com/questions/40262682/how-to-run-selenium-3-x-with-chrome-driver-through-terminal
# https://askubuntu.com/questions/760085/how-do-you-install-google-chrome-on-ubuntu-16-04

# Versions
CHROME_DRIVER_VERSION=`curl -sS https://chromedriver.storage.googleapis.com/LATEST_RELEASE`

shahwan42

Technologies to learn to become a Back End Developer (Python/Django)

• Linux - be proficient using Ubuntu for example and the CLI and understand how the shell works, what are environment variables, subshells, processes/tasks, etc...
• Docker (and docker-compose) - what are containers and how they work (conceptually) and how to create and run ones
• Git - what does version control system mean and how to use Git
• RDB (relational databases) - what are relational databases, and understand tables, how to create them and make relations between them as needed... also understand that through SQLite and PostgreSQL (preferred) or MySQL
• Python - how to write Python very well and understand its [OOP] implementation...
• Virtualenv - And how to create virtual environments for python to isolate it from the system's installed version...
• Virtualenvwrapper to manage virtual environments easily

fernandoaleman

# Start the old vagrant
$ vagrant init centos-6.3
$ vagrant up

# You should see a message like:
#  [default] The guest additions on this VM do not match the install version of
#  VirtualBox! This may cause things such as forwarded ports, shared
#  folders, and more to not work properly. If any of those things fail on
#  this machine, please update the guest additions and repackage the
#  box.

provisioner-php5.5.sh

#!/usr/bin/env bash

# Update PHP Repo
sudo rm /etc/apt/sources.list.d/ondrej-php5-5_6-trusty.list
sudo add-apt-repository -y ppa:ondrej/php
sudo apt-get -y update

# Remove PHP 5.6
sudo apt-get --remove purge -y php5 php5-cli php5-curl php5-gd php5-intl php5-mcrypt php5-memcached php5-mysqlnd php5-readline php5-sqlite php5-cgi php5-common php5-fpm php5-imagick php5-json php5-memcache php5-mongo php5-pgsql php5-redis php-pear
sudo apt-get -y autoremove

morgangiraud

# Remove anything linked to nvidia
sudo apt-get remove --purge nvidia*
sudo apt-get autoremove

# Search for your driver
apt search nvidia

# Select one driver (the last one is a decent choice)
sudo apt install nvidia-370

tegansnyder

Details of steps I took on each node in a nine node ES cluster on RHEL7. These steps need to occur one node at a time, i.e. "rolling upgrade")

Step 1: Disable shard allocation

curl -XPUT "http://localhost:9200/_cluster/settings" -d'
{
  "transient": {
    "cluster.routing.allocation.enable": "none"
  }
}'

pcostesi

uWSGi and NGiNX Set-Up

Table of Contents generated with DocToc

• uWSGi and NGiNX Set-Up
  • Table of Contents
• Brief introduction to each part