joshuajlai

# do it once
seq 1 | parallel -n0 "curl -H 'Content-Type: application/json' http://httpbin.org/post -X POST -d '{\"url\":\"http://google.com/\"}'"

# do it twice
seq 2 | parallel -n0 "curl -H 'Content-Type: application/json' http://httpbin.org/post -X POST -d '{\"url\":\"http://google.com/\"}'"

# do it 4 times, but at 2 a time
seq 4 | parallel -n0 -j2 "curl -H 'Content-Type: application/json' http://httpbin.org/post -X POST -d '{\"url\":\"http://google.com/\"}'"

# you can also put all your commands into a file

joshuajlai

# After you run this query, it is necessary to cross reference against tax rates we have already sent FA, so get that list
# Rohan or Josh

unequal = []
subs = SubscriptionEngine::Subscription.active
count = 0
# Compares sales tax rate on boarding file to current sales tax rate
subs.each do |sub|
	count += 1
	package_entry = SubscriptionEngine::FirstAssociatesPackageEntry.where(subscription_id: sub.id).last

joshuajlai

yum update
yum install epel-release
yum install gcc gcc-c++ glibc-devel make ncurses-devel openssl-devel autoconf java-1.8.0-openjdk-devel git wget wxBase.x86_64
wget https://packages.erlang-solutions.com/erlang-solutions-1.0-1.noarch.rpm
rpm -Uvh erlang-solutions-1.0-1.noarch.rpm
yum update
yum install erlang
cd /usr/local/lib
git clone https://github.com/elixir-lang/elixir.git
cd elixir

joshuajlai

An Ansible summary

Jon Warbrick, July 2014, V3.2 (for Ansible 1.7)

Configuration file

intro_configuration.html

First one found from of

joshuajlai

#!groovy
import groovy.json.JsonOutput
import groovy.json.JsonSlurper

/*
Please make sure to add the following environment variables:
HEROKU_PREVIEW=<your heroku preview app>
HEROKU_PREPRODUCTION=<your heroku pre-production app>
HEROKU_PRODUCTION=<your heroku production app>

joshuajlai

#!/usr/bin/env bash

read -r -d '' usage << EOM
Usage:

  gh-deploy-clone user/repo [ENVIRONMENT]
EOM

[ -z "$1" ] && echo && echo "$usage" && echo && exit 1

joshuajlai

Let's say alice is a github.com user, with 2 or more private repositories repoN. For this example we'll work with just two repositories named repo1 and repo2

https://github.com/alice/repo1

https://github.com/alice/repo2

You need to be to pull from these repositories without entering a passwords probably on a server, or on multiple servers. You want to perform git pull origin master for example, and you want this to happen without asking for a password.

joshuajlai

#!/bin/bash
#
# this script will attempt to detect any ephemeral drives on an EC2 node and create a RAID-0 stripe
# mounted at /mnt. It should be run early on the first boot of the system.
#
# Beware, This script is NOT fully idempotent.
#

METADATA_URL_BASE="http://169.254.169.254/2012-01-12"

joshuajlai

#!/bin/bash

# Setup
#
# - Create a new Jenkins Job
# - Mark "None" for Source Control Management
# - Select the "Build Periodically" build trigger
#   - configure to run as frequently as you like
# - Add a new "Execute Shell" build step
#   - Paste the contents of this file as the command

joshuajlai

Jenkins Best Practices
https://en.wikipedia.org/wiki/Continuous_integration<- Read this!
https://wiki.jenkins-ci.org/display/JENKINS/Jenkins+Best+Practices
http://www.slideshare.net/andrewbayer/7-habits-of-highly-effective-jenkins-users
Set up version control of job configurations
Keep jobs simple! Don't put a ton of bash in each job. If a job needs to do something complex, put it in a script in GitHub and check it out as needed.
Use templated builders to simplify common tasks
Keep all scripts in version control - avoid running scripts that live on the Jenkins server filesystem
Don't install unnecessary plugins - plugins are often written by third parties and can interact with each other in strange ways
Use LDAP authentication if possible for traceability - avoid anonymous access