Chris Habgood chabgood

DigitalOcean Ubuntu 14.04 x64 + Rails 4 + Nginx + Unicorn + PostgreSQL + Capistrano 3

Create a Droplet

SSH into Root

$ ssh [email protected]

Change Root Password

Here's all you have to do to add clustering to your node.js application.

save this code as cluster.js, and run cluster.js instead of server.js (or /bin/www, or whatever it's called for your project)
the only line you'll need to change is the last line - it needs to point to the location of your server.js file

var cluster = require('cluster');

if (cluster.isMaster) {
  // Count the machine's CPUs
 var cpuCount = require('os').cpus().length;

If you see this error when cron job runs a ruby script:

'require': cannot load such file ...

And you are using bundler e.g. require 'bundler/setup'. It's probably because the directory where cron runs the script is not correct, resulting in bundler fails to load gems.

Simply changed the directory to fix it, i.e.

* * * * * /usr/local/bin/ruby -C /home/example/scripts example_script.rb >>/home/example/log/cron.log 2>&1

	# create table topics!
	create table topics (
	id int primary key auto_increment,
	name varchar(256),
	parent_id int null,
	type smallint not null,

	foreign key (parent_id) references topics(id),
	index(type)
	);

	openssl genrsa -out CAroot.key 2048
	openssl req -new -key CAroot.key -out CAroot.csr # CN should be different from the certificates below
	openssl req -x509 -days 1825 -key CAroot.key -in CAroot.csr -out CAroot.crt
	cat CAroot.crt CAroot.key > CAroot.pem

	openssl genrsa -out mongod.key 2048
	openssl req -new -key mongod.key -out mongod.csr
	openssl x509 -req -days 1825 -in mongod.csr -CA CAroot.pem -CAkey CAroot.key -CAcreateserial -out mongod.crt
	cat mongod.crt mongod.key > mongod.pem

	package main

	import (
	"database/sql"
	"gopkg.in/gorp.v1"
	"log"
	"strconv"

	"github.com/gin-gonic/gin"
	_ "github.com/go-sql-driver/mysql"

	upstream puma {
	server unix:///var/www/app/shared/tmp/sockets/puma.sock fail_timeout=0;
	}

	server {
	listen 80 default deferred;
	server_name example.com;
	rewrite ^/(.+) https://example.com/$1 permanent;
	}

	#Timecop is fun, but you don't need a whole gem for that. Just use
	#Time.stub(:now), e.g.

	describe "time" do
	before do
	@fake_time = Time.now
	Time.stub(:now) { @fake_time }
	end
	it "is equal" do
	Time.now.should == Time.now # now it passes

	# if you want to render flamegraphs
	gem "stackprof", require: false # required by flamegraph
	gem "flamegraph", require: false

	# Drop this into /spec/support/matchers
	# Usage: result.should be_url
	# Passes if result is a valid url, returns error "expected result to be url" if not.

	# Matcher to see if a string is a URL or not.
	RSpec::Matchers.define :be_url do \|expected\|
	# The match method, returns true if valie, false if not.
	match do \|actual\|
	# Use the URI library to parse the string, returning false if this fails.
	URI.parse(actual) rescue false