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?

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

clintel

Fenced code blocks inside ordered and unordered lists

1. This is a numbered list.

2. I'm going to include a fenced code block as part of this bullet:

   Code
   More Code
   

m-radzikowski

#!/usr/bin/env bash

set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

usage() {
  cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...]

rgs

Falsehoods programmers believe about prices

1. You can store a price in a floating point variable.
2. All currencies are subdivided in 1/100th units (like US dollar/cents, euro/eurocents etc.).
3. All currencies are subdivided in decimal units (like dinar/fils)
4. All currencies currently in circulation are subdivided in decimal units. (to exclude shillings, pennies) (counter-example: MGA)
5. All currencies are subdivided. (counter-examples: KRW, COP, JPY... Or subdivisions can be deprecated.)
6. Prices can't have more precision than the smaller sub-unit of the currency. (e.g. gas prices)
7. For any currency you can have a price of 1. (ZWL)
8. Every country has its own currency. (EUR is the best example, but also Franc CFA, etc.)

RafPe

Server 2 sockets,6 cores each, 2.4ghz

# Set ixgbe options
# Limit RSS queues to the number of physical cores per cpu
# Disable offload
# When you change this, you need to run the command and reboot for it to take.
echo "options ixgbe LRO=0,0 MQ=1,1 RSS=6,6 VMDQ=0,0 vxlan_rx=0,0" > /etc/modprobe.d/ixgbe.conf

# Shut down HT cores
for i in $(seq 1 2 23); do

barentsen

sudo apt install libresample1 
wget http://mirrors.kernel.org/ubuntu/pool/universe/liba/libav/libavutil52_9.18-0ubuntu0.14.04.1_amd64.deb
sudo dpkg -i libavutil52_9.18-0ubuntu0.14.04.1_amd64.deb
wget http://mirrors.kernel.org/ubuntu/pool/universe/liba/libav/libswscale2_9.18-0ubuntu0.14.04.1_amd64.deb
sudo dpkg -i libswscale2_9.18-0ubuntu0.14.04.1_amd64.deb
wget https://www.dropbox.com/s/gg2i5wszrqkhzy8/clickshare_01.07.01-79_amd64.deb?dl=0#
sudo dpkg -i clickshare_01.07.01-79_amd64.deb

fadenb

APKTIDoLV060B_LpPwpXFQqH8HTJF7CcJHMGGIpfDWOPT1dYGU_g

joschi

# Create an access token for user "admin" with name "test-1234"
# POST /users/{username}/tokens/{name}
$ curl -i -u admin:admin -H 'Accept: application/json' -X POST 'http://127.0.0.1:12900/users/admin/tokens/test-1234?pretty=true'
HTTP/1.1 200 OK
X-Graylog-Node-ID: cd03ee44-b2a7-4824-be16-bb7456149dbd
Content-Type: application/json
Date: Mon, 08 Aug 2016 12:12:09 GMT
Content-Length: 139

{

dysinger

# MOVED HERE https://gist.github.com/dysinger/2a768db5b6e3b729ec898d7d4208add3