junaidk

# install aws cli first and configure it with credentials and default region
# the script will iterate over all regions of AWS

for region in `aws ec2 describe-regions --output text | cut -f4`
do
     echo -e "\nListing Instances in region:'$region'..."
     aws ec2 describe-instances --query "Reservations[*].Instances[*].{IP:PublicIpAddress,ID:InstanceId,Type:InstanceType,State:State.Name,Name:Tags[0].Value}" --output=table --region $region
done

rafaeltuelho

My Openshift Cheatsheet

Openshift build secrets for cloning git repos using SSH Keys

• To create ssh secret:

oc create secret generic sshsecret \
    --from-file=ssh-privatekey=$HOME/.ssh/id_rsa

maxtruxa

Antonym List

Note: The table headings (positive/negative) are not necessarily meaningful.

Positive	Negative
acquire	release
add	remove (e.g. an item), subtract (arithmetic)
advance	retreat
allocate	deallocate (correct), free (common)
allow	deny

yuanying

Install Vagrant

sudo su
apt-get update && apt-get install -y libvirt-dev ruby-all-dev apparmor-utils
curl -O -L https://dl.bintray.com/mitchellh/vagrant/vagrant_1.6.5_x86_64.deb
dpkg -i vagrant_1.6.5_x86_64.deb 
aa-complain /usr/lib/libvirt/virt-aa-helper # workaround
exit

Install vagrant-kvm as user

brianclements

#!/bin/bash

# options:
# remove stopped containers and untagged images
#   $ dkcleanup 
# remove all stopped|running containers and untagged images
#   $ dkcleanup --reset
# remove containers|images|tags matching {repository|image|repository\image|tag|image:tag}
# pattern and untagged images
#   $ dkcleanup --purge {image}

XVilka

Terminal Colors

There exists common confusion about terminal colors. This is what we have right now:

• Plain ASCII
• ANSI escape codes: 16 color codes with bold/italic and background
• 256 color palette: 216 colors + 16 ANSI + 24 gray (colors are 24-bit)
• 24-bit true color: "888" colors (aka 16 milion)

havenwood

Unscientific Benchmark

The Benchmark

def is_prime? n
  (2...n).all? { |i| n % i != 0 }
end

def sexy_primes n

leifg

file_to_disk = './tmp/large_disk.vdi'

Vagrant::Config.run do |config|
  config.vm.box = 'base'

  config.vm.customize ['createhd', '--filename', file_to_disk, '--size', 500 * 1024]
  config.vm.customize ['storageattach', :id, '--storagectl', 'SATA Controller', '--port', 1, '--device', 0, '--type', 'hdd', '--medium', file_to_disk]
end

danielbeardsley

#!/bin/bash

if [ "$1" != "report" ]; then
   echo "Usage:" >&2
   script="`basename $0`"
   echo "  nohup $script report > /var/log/memcache-stats.log &" >&2
   exit 1
fi

GRAPHITE_SERVER=localhost

jmervine

#!/usr/bin/env ruby

require 'benchmark'

# require libs here


iterations = ARGV[0]||100000 # pass in iterations or