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#!/usr/bin/env ruby
require 'thread'

Thread.abort_on_exception = true

module Enumerable
  def peach n=nil, &block
    pmap n, &block
    self
  end

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# Basics

module Chef
  class Resource
    attr_reader :name

    def initialize name
      @name = name
    end

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# knife cheat

## Search Examples

	knife search "name:ip*" 
	knife search "platform:ubuntu*"
	knife search "platform:*" -a macaddress
	knife search "platform:ubuntu*" -a uptime
	knife search "platform:ubuntu*" -a virtualization.system
	knife search "platform:ubuntu*" -a network.default_gateway

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Producer

Setup
bin/kafka-topics.sh --zookeeper localhost:2181/kafka-local --create --topic test-rep-one --partitions 6 --replication-factor 1
bin/kafka-topics.sh --zookeeper localhost:2181/kafka-local --create --topic test-rep-two --partitions 6 --replication-factor 3

Single thread, no replication
bin/kafka-run-class.sh org.apache.kafka.tools.ProducerPerformance --print-metrics --topic test-rep-one --num-records 6000000 --throughput 100000 --record-size 100 --producer-props bootstrap.servers=kafka_host:9092 buffer.memory=67108864 batch.size=8196

Single-thread, async 3x replication

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#!/bin/bash
#
# Author: Ambud Sharma
#
# Purpose: To run kafka Kafka Producer / Consumer benchmark and create results
#
export NUM_RECORDS=10000000
export TOPIC_NAME_PREFIX="perf"
export CLUSTER_SIZE=3
export DRIVE_COUNT=1

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import boto3
tagname = "Name"
tagvalue = "Value"
ec2 = boto3.resource('ec2')
ec2.instances.filter(Filters=[
    {'Name': 'tag': [tagname], 'Values': [tagvalue]},
    {'Name': 'instance-state-name', 'Values': ['running']}
]).start()

ec2.instances.filter(Filters=[

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$ docker-compose up -d         # start containers in background
$ docker-compose kill          # stop containers
$ docker-compose up -d --build # force rebuild of Dockerfiles
$ docker-compose rm            # remove stopped containers
$ docker ps                    # see list of running containers
$ docker exec -ti [NAME] bash # ssh to the container

# list all images
docker images

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FILE SPACING:

 # double space a file
 sed G

 # double space a file which already has blank lines in it. Output file
 # should contain no more than one blank line between lines of text.
 sed '/^$/d;G'

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Don't use VPN services.

No, seriously, don't. You're probably reading this because you've asked what VPN service to use, and this is the answer.

Note: The content in this post does not apply to using VPN for their intended purpose; that is, as a virtual private (internal) network. It only applies to using it as a glorified proxy, which is what every third-party "VPN provider" does.

(A Russian translation of this article can be found here, contributed by Timur Demin.)

Why not?

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knowledge dump on container runtimes

KataContainers
- image coupled with kernel 
- light vm layer
- can run in nested virturalization environments if hardware supports and you can enable it in bios (ex. only bare metal EC2 instances, limits many cloud providers)
- slower startup time
- OCI compliant
- previously known as ClearContainers by Intel