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?

brandonb927

#!/bin/sh

###
# SOME COMMANDS WILL NOT WORK ON macOS (Sierra or newer)
# For Sierra or newer, see https://github.com/mathiasbynens/dotfiles/blob/master/.macos
###

# Alot of these configs have been taken from the various places
# on the web, most from here
# https://github.com/mathiasbynens/dotfiles/blob/5b3c8418ed42d93af2e647dc9d122f25cc034871/.osx

veuncent

AWS Glacier: Delete vault

Follow these steps to remove all archives from an AWS vault. After this is finished, you will be able to delete the vault itself through the browser console.

Step 1 / Retrieve inventory

This will create a job that collects required information about the vault.

$ aws glacier initiate-job --job-parameters '{"Type": "inventory-retrieval"}' --account-id YOUR_ACCOUNT_ID --region YOUR_REGION --vault-name YOUR_VAULT_NAME 

isaacs

echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
. ~/.bashrc
mkdir ~/local
mkdir ~/node-latest-install
cd ~/node-latest-install
curl http://nodejs.org/dist/node-latest.tar.gz | tar xz --strip-components=1
./configure --prefix=~/local
make install # ok, fine, this step probably takes more than 30 seconds...
curl https://www.npmjs.org/install.sh | sh

peterjaap

<?php

/*
 * This script deletes duplicate images and imagerows from the database of which the images are not present in the filesystem.
 * It also removes images that are exact copies of another image for the same product.
 * And lastly, it looks for images that are on the filesystem but not in the database (orphaned images).
 * 
 * This script can most likely be optimized but since it'll probably only be run a few times, I can't be bothered.
 *
 * Place scripts in a folder named 'scripts' (or similar) in the Magento root.

fernandoaleman

For MacOS Catalina, visit Install mysql2 on MacOS Catalina

Problem

Installing mysql2 gem errors on MacOS Mojave.

Solution

Make sure openssl is installed on Mac via Homebrew.

rcoup

#!/bin/bash
set -e

# Usage:
#   rsync_parallel.sh [--parallel=N] [rsync args...]
# 
# Options:
#   --parallel=N	Use N parallel processes for transfer. Defaults to 10.
#
# Notes:

dalecaru

#!/bin/sh
# 
# Script to prepare and restore full and incremental backups created with innobackupex-runner.
#
# This script is provided as-is; no liability can be accepted for use.
#

INNOBACKUPEX=innobackupex-1.5.1
INNOBACKUPEXFULL=/usr/bin/$INNOBACKUPEX
TMPFILE="/tmp/innobackupex-restore.$$.tmp"

jasontipton

<?xml version="1.0"?>
<layout version="0.1.0">

    <!-- Search Results page -->
    <catalogsearch_result_index>
      <reference name="head">
         <action method="setRobots"><value>NOINDEX,NOFOLLOW</value></action>
      </reference>
   </catalogsearch_result_index>

jaygooby

#!/bin/bash
#
# Carries out a full mysqldump, calls percona-xtrabackup and then
# copies the sql dump, the percona backup and your mysql bin logs
# to S3 using s3cmd http://s3tools.org/s3cmd
# 
# TODO: extract out the S3 backup stuff to make it optional, and so
# other s3 programs can replace the s3cmd call.
# TODO: the if [ $? == 0 ] alert blocks should be a function
# TODO: make the if [ $? == 0 ] if [ $? != 0 ] more consistent - test