Alex Berber junoteam

Killing supervisor if any of it's child processes fail

The trick is to only register the listener for events that indicate failure, namely

PROCESS_STATE_STOPPED
PROCESS_STATE_EXITED
PROCESS_STATE_FATAL

Once they do, we should send a SIGQUIT to Supervisor.

A few show tricks to find slow queries in mongodb

Enable profiling

First, you have to enable profiling

> db.setProfilingLevel(1)

Now let it run for a while. It collects the slow queries ( > 100ms) into a capped collections, so queries go in and if it's full, old queries go out, so don't be surprised that it's a moving target...

Pattern file: /etc/logstash/patterns/nginx Logstash shipper: /etc/logstash/conf.d/shipper.conf

Nginx http log module: http://nginx.org/en/docs/http/ngx_http_log_module.html

Running redis using upstart on Ubuntu

I've been trying to understand how to setup systems from the ground up on Ubuntu. I just installed redis onto the box and here's how I did it and some things to look out for.

To install:

	resource "digitalocean_droplet" "web" {
	image = "ubuntu-16-04-x64"
	name = "web-1"
	region = "sgp1"
	size = "512mb"
	ssh_keys = [12345]

	connection {
	type = "ssh"
	user = "root"

	package main

	import (
	"fmt"
	"syscall"
	)

	type DiskStatus struct {
	All uint64 `json:"all"`
	Used uint64 `json:"used"`

	#
	# This config file is a combination of ideas from:
	# http://www.37signals.com/svn/posts/1073-nuts-bolts-haproxy
	# http://www.igvita.com/2008/05/13/load-balancing-qos-with-haproxy/
	# http://wiki.railsmachine.com/HAProxy
	# http://elwoodicious.com/2008/07/15/nginx-haproxy-thin-fastcgi-php5-load-balanced-rails-with-php-support/
	# http://upstream-berlin.com/2008/01/09/using-haproxy-with-multiple-backends-aka-content-switching/
	# http://wiki.railsmachine.com/HAProxy
	# http://gist.github.com/raw/25482/d39fb332edf977602c183194a1cf5e9a0b5264f9
	#

	#!/bin/sh

	#Put this script into <gitProject>/hooks/post-receive on the production server
	#Make sure this script has execute permissions (chmod +x post-receive)

	#You can create a group (like "git"), make it owner of this file, and add
	#every user that needs to push to the that group.

	echo 'start repo to prod'

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