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?

philipz

Reference

1. Get started with multi-host networking
2. Docker Machine and VMware vSphere

#Set up a key-value store

Docker-Consul

docker-machine create docker-consul --driver vmwarevsphere --vmwarevsphere-datacenter ha-datacenter --vmwarevsphere-vcenter 192.168.2.12 --vmwarevsphere-username root --vmwarevsphere-password PASSWORD --vmwarevsphere-datastore 500G --vmwarevsphere-network "VM Network"

Run progrium/consul

docker $(docker-machine config docker-consul) run -d --restart=always -p 8500:8500 -h consul progrium/consul -server -bootstrap #Create a Swarm cluster

ikatson

function fswatch_propagate_pwd_changes_to_docker () {
    echo "Starting fswatch on $PWD"
    # tracking previous not to get into endless loop of changing the same file
    local previous=''
    fswatch -r "$PWD" | while read file; do
        if [[ previous != "$file" ]]; then
            docker run --rm -v "$PWD":"$PWD" busybox touch -c "$file"
        fi
        previous="$file"
    done

sigmaris

We couldn’t find that file to show.

thoop

# Change YOUR_TOKEN to your prerender token
# Change example.com (server_name) to your website url
# Change /path/to/your/root to the correct value

server {
    listen 80;
    server_name example.com;
 
    root   /path/to/your/root;
    index  index.html;

plentz

# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

agross

class TeamCity
  def self.running?
    ENV.include? 'TEAMCITY_PROJECT_NAME'
  end

  def self.method_missing(method, *args, &block)
    return unless running?
    
    message_name = camel_case method.to_s
    publish message_name, args[0]

rafaelfelix

require 'facter'
require 'json'

if Facter.value("ec2_instance_id") != nil
 instance_id = Facter.value("ec2_instance_id")
 region = Facter.value("ec2_placement_availability_zone")[0..-2]
 tags = Facter::Util::Resolution.exec("aws ec2 describe-tags --filters \"name=resource-id,values=#{instance_id}\" --region #{region} | jq '[.Tags[] | {key: .Key, value: .Value}]'")
 
 parsed_tags = JSON.parse(tags)
 parsed_tags.each do |tag|

justlaputa

jobs

jenkins_url + /api/json?tree=jobs[name,color]

builds

jenkins_url + /job/${job_name}/api/json?tree=builds[number,status,timestamp,id,result]

last build

wigsy

require 'rubygems'
require 'grok-pure'

# Set a new matcher
grok = Grok.new

# Load default and custom patterns
grok.add_patterns_from_file("/etc/logstash/patterns/default")
grok.add_patterns_from_file("/etc/logstash/patterns/mycustoms")