bosgood

# Borrowed from
# https://stackoverflow.com/a/17992126/573791

# import the hash algorithm
from passlib.hash import sha512_crypt

# generate new salt, and hash a password
hash = sha512_crypt.encrypt("password")
hash

bosgood

# Append another grep to find a specific security group
aws ec2 describe-instances --output text | grep sg-

bosgood

#!/bin/bash

# Borrowed from: AWS re:Invent 2015 | (CMP311) This One Weird API Request Will Save You Thousands
# https://www.youtube.com/watch?v=_6bgSDZeLAw

while true
  do
    if curl -s http://169.254.169.254/latest/meta-data/spot/termination-time | grep -q .*T.*Z; then
      /env/bin/runterminationscripts.sh
    else

bosgood

aws autoscaling set-instance-health --instance-id="$(curl http://169.254.169.254/latest/meta-data/instance-id)" --health-status="Unhealthy"

bosgood

// In your database/models:
type User struct {
	Name sql.NullString  // Or any other maybe/option/nullable type
}

// In your graphql schema, use this helper to define a nullable string field:
func resolveNullableString(p graphql.ResolveParams) (interface{}, error) {
	v := reflect.ValueOf(p.Source).Elem()
	if !v.IsValid() {
		return nil, fmt.Errorf("Invalid elem: %v", p.Source)

bosgood

# Useful sometimes: Use a data item instead of a JSON literal to represent IAM policy
data "aws_iam_policy_document" "instance-assume-role-policy" {
  statement {
    actions = [ "sts:AssumeRole" ]

    principals {
      type = "Service"
      identifiers = ["ec2.amazonaws.com"]
    }
  }

bosgood

# List running instances
aws ec2 describe-instances --filters "Name=instance-state-name,Values=running" --output="table" --query="Reservations[*].Instances[*].{Dns:PublicDnsName,Type:InstanceType}"

bosgood

#!/bin/bash

set -o errexit

echo "Removing exited docker containers..."
docker ps -a -f status=exited -q | xargs -r docker rm -v

echo "Removing dangling images..."
docker images --no-trunc -q -f dangling=true | xargs -r docker rmi

bosgood

                  The Erotic Ontology of Cyberspace

                            Michael Heim

This is a chapter from Michael Heim's book The Metaphysics of Virtual Reality (New York: Oxford University Press, 1993: 82-108).

Cyberspace is more than a breakthrough in electronic media or in computer interface design. With its virtual environments and simulated worlds,

bosgood

var collectionName = "<your collection name here>";
var field = "<your unique column name here>";

// Part 1
var indexObj = {}; indexObj[field] = 1;
db[collectionName].count()
db[collectionName].createIndex(indexObj, { unique: true })

// If this doesn't fail, you're done!