Srigi srigi

Local SSL websites on macOS Sierra

These instructions will guide you through the process of setting up local, trusted websites on your own computer.

These instructions are intended to be used on macOS Sierra, but they have been known to work in El Capitan, Yosemite, Mavericks, and Mountain Lion.

NOTE: You may substitute the edit command for nano, vim, or whatever the editor of your choice is. Personally, I forward the edit command to Sublime Text:

alias edit="/Applications/Sublime\ Text.app/Contents/SharedSupport/bin/subl"

a simple git branching model (written in 2013)

This is a very simple git workflow. It (and variants) is in use by many people. I settled on it after using it very effectively at Athena. GitHub does something similar; Zach Holman mentioned it in this talk.

Update: Woah, thanks for all the attention. Didn't expect this simple rant to get popular.

Introduction to Kafka

Kafka acts as a kind of write-ahead log (WAL) that records messages to a persistent store (disk) and allows subscribers to read and apply these changes to their own stores in a system appropriate time-frame.

Terminology:

Producers send messages to brokers
Consumers read messages from brokers
Messages are sent to a topic

just change out app_name for your purposes

openssl genrsa 2048 > app_name-wildcard.key

openssl req -new -x509 -nodes -sha1 -days 3650 -key app_name-wildcard.key > app_name-wildcard.cert

# Common Name (eg, your name or your server's hostname) []:*.app_name.com

openssl x509 -noout -fingerprint -text &lt; app_name-wildcard.cert &gt; app_name-wildcard.info

Linux simple performance tweaks

Change the I/O Scheduler

Open $ vim /etc/default/grub then add elevator=noop next to GRUB_CMDLINE_LINUX_DEFAULT. Run $ update-grub and $ cat /sys/block/sda/queue/scheduler to be sure that noop is being used:

$ vim /etc/default/grub
$ update-grub
$ cat /sys/block/sda/queue/scheduler

[noop] deadline cfq

	#!/bin/sh
	#
	# simulate_3g.sh - Simulate a sluggish 3G network with delays & packet loss
	# Usage: simulate_3g.sh 8080 8081

	# Make sure only root can run our script
	if [[ $EUID -ne 0 ]]; then
	echo "This script must be run as root" 1>&2
	exit 1
	fi

	var pubListener = 'tcp://127.0.0.1:5555';
	var subListener = 'tcp://127.0.0.1:5556';
	var hwm = 1000;
	var verbose = 0;

	// The xsub listener is where pubs connect to
	var subSock = zmq.socket('xsub');
	subSock.identity = 'subscriber' + process.pid;
	subSock.bindSync(subListener);

	/**
	* Example of using an angular provider to build an api service.
	* @author Jeremy Elbourn (@jelbourn)
	*/

	/** Namespace for the application. */
	var app = {};

	/******************************************************************************/

	## Install necessary packages
	$ sudo apt-get install virtualbox-ose qemu-utils genisoimage cloud-utils

	## get kvm unloaded so virtualbox can load
	$ sudo modprobe -r kvm_amd kvm_intel
	$ sudo service virtualbox stop
	$ sudo service virtualbox start

	## URL to most recent cloud image of 12.04
	$ img_url="http://cloud-images.ubuntu.com/server/releases/12.04/release"