Siva Kommuri neowulf

Handling of StreamingBody Response from Invoking a Lambda Function

When calling a Lambda Function via Boto3, the returned object is something like:

{u'Payload': <botocore.response.StreamingBody object at 0x7f8d5b62ac50>, 
'ResponseMetadata': {'RetryAttempts': 0, 'HTTPStatusCode': 200, 'RequestId': '5bdbb3ca-3b35-11e7-9816-397b140c3bac', 'HTTPHeaders': {'x-amzn-requestid': '5bdbb3ca-3b35-11e7-9816-397b140c3bac', 'content-length': '1636', 'x-amzn-trace-id': 'root=1-591ca199-00d34d5474d16275ec2c8d10;sampled=0', 'x-amzn-remapped-content-length': '0', 'connection': 'keep-alive', 'date': 'Wed, 17 May 2017 19:16:41 GMT', 'content-type': 'application/json'}}, u'StatusCode': 200}

The Payload parameter is <botocore.response.StreamingBody> which is a data streaming object.

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

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?

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

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Connmanctl Cheat Sheet

Documentation @ http://git.kernel.org/cgit/network/connman/connman.git/tree/doc

Configure WiFi

Scan for access points (run multiple times for more complete scan):
```
  # connmanctl scan wifi
```

Scan completed for wifi

	#!/bin/sh

	set -euo pipefail

	# Setup default values
	METALLB_VERSION=${METALLB_VERSION:-"v0.13.7"}

	## Install MetalLB.
	kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/"${METALLB_VERSION}"/config/manifests/metallb-native.yaml
	needCreate="$(kubectl get secret -n metallb-system memberlist --no-headers --ignore-not-found -o custom-columns=NAME:.metadata.name)"

	global
	log /dev/log local0
	log /dev/log local1 notice

	defaults
	log global
	mode tcp
	option tcplog
	option dontlognull
	timeout connect 5s

	package systemsimulation

	import io.gatling.core.Predef._
	import io.gatling.core.session._
	import io.gatling.http.Predef._
	import scala.concurrent.duration._
	import general._

	class SystemSimulation extends Simulation {
	// configure proxy

	package com.grasswire.grasswireurlshortener

	import akka.actor.ActorSystem
	import com.typesafe.config.ConfigFactory
	import org.apache.commons.validator.routines.UrlValidator
	import spray.http.StatusCodes
	import spray.routing._
	import scala.util.Random
	import scalaz.concurrent._

	# post_loc.txt contains the json you want to post
	# -p means to POST it
	# -H adds an Auth header (could be Basic or Token)
	# -T sets the Content-Type
	# -c is concurrent clients
	# -n is the number of requests to run in the test

	ab -p post_loc.txt -T application/json -H 'Authorization: Token abcd1234' -c 10 -n 2000 http://example.com/api/v1/locations/