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# Create internet gateways, route tables, and corresponding ACLs in AWS VPC to secure our network.

# create internet gateway
aws ec2 create-internet-gateway

# attach internet gateway to a vpc
aws ec2 attach-internet-gateway --internet-gateway-id igw-06604b3e --vpc-id vpc-ad6bd2f7

# create a route table
aws ec2 create-route-table --vpc-id vpc-ad6bd2f7

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# example: installation of `kops` utility
curl -Lo kops https://github.com/kubernetes/kops/releases/download/$(curl -s https://api.github.com/repos/kubernetes/kops/releases/latest | grep tag_name | cut -d '"' -f 4)/kops-darwin-amd64
chmod +x kops
sudo mv kops /usr/local/bin/kops

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HOWTO: Download a File from the Command Line

Using Curl

Download a file off of Github

NOTE: You can view the raw contents of a file by clicking on the Raw button that appears above the file view.

curl -Lo  https://raw.githubusercontent.com/path/to/file

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apt update && apt upgrade # update apt utility and upgrade already installed packages
apt install python-pip    # install tool

# tip: if unable to install older version of pip, run this:
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py; python get-pip.py

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cat /proc/meminfo # print memory info about the machine
sudo /etc/init.d/<app> start # start an app/service
sudo /etc/init.d/<app> stop # stop an app/service 

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kubectl rollout restart deploy <release> # bounce a release
kubectl delete ns <name> # destroy a namespace

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vagrant --version

vagrant box add bento/ubuntu-14.04 # install Ubuntu image
vagrant init bento/ubuntu-14.04    # initialize image
vagrant up                         # run image
vagrant ssh                        # ssh into running container

# addition vagrant commands
vagrant status  # check status of the VM
vagrant suspend # suspend the VM

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sudo chef-client --local-mode --runlist 'recipe[chef-workstation]'
sudo chef-client --help
# /etc/chef/client.rb => manages the execution of the chef client run

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# Copy this into an irb session for easy benchmark testing

require 'benchmark'

# @param labels_and_procs [Hash{String=>Proc}]
def bm_test(labels_and_procs, n = 1000, label_width = 7)
  puts "running #{n} times"
  ::Benchmark.bm(label_width) do |x|
    labels_and_procs.each do |label, proc|
      x.report("#{label}:") { n.times { proc.call } }

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### Walkthrough #1: Create our first virtual machine in the cloud

# get list of commands useful for EC2
aws ec2 help | grep "\sdescribe"

# create an SSH keypair for AWS
aws ec2 create-key-pair --key-name MyKeyPair --query 'KeyMaterial' --output text > MyKeyPair.pem

# verify that AWS knows about our newly created key
aws ec2 describe-key-pairs --key-name MyKeyPair