rollwagen rollwagen

Keybase proof

I hereby claim:

I am rollwagen on github.
I am rollwagen (https://keybase.io/rollwagen) on keybase.
I have a public key ASDtWgTkfepNwxe0lhdz4HNefIc67eS_gcl1N71axhZQRgo

To claim this, I am signing this object:

Dynamo DB Data Models and Modelling

It’s a bad idea to model your data in DynamoDB the same way you model your data in a relational database. The entire point of using a NoSQL datastore is to get some benefit you couldn’t get with a relational database. If you model the data in the same way, you not only won’t get that benefit but you will also end up with a solution that’s worse than using the relational database!

from Alex DeBrie: The DynamoDB book

aws cloudformation "validation"

consider the following sample cloudformation yaml file y.yaml

Resources:
  S3SampleBucketinstacks3bucketF253E29D:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: "Test_S3SampleBucketinstacks3bucketF253E29D"
      BucketVersioningConfiguration: Enabled

arch linux arm on esxi fling (on raspberry pi 4)

create / Register VM -> Linux / Other 4.x or Later (64bit) -> ...
- CD/DVD Drive: use a Linux ISO that can boot into a recue shell e.g 'debian-10.9.0-arm64-netinst.iso'; make sure "Connect at power on" is selected
- VM Options / Boot options: Firmware "EFI" (should be the default anyways)
power On VM -> should see GNU GRUB welcome screen (from debian ISO/cdrom) -> Advanced Options -> Rescue mode
- go through menu selections (language, keyborad, etc) until you have a shell ('Execute a shell in the intaller environment')
partition the disk; see also ArchLinux Wiki Partition the disk

lsof / netstat on macos

lsof - list open files

display (list) all open TCP+UDP ports and grep for listening ones

sudo lsof -i -P | grep LISTEN

COMMAND     PID           USER   FD   TYPE             DEVICE SIZE/OFF   NODE NAME
launchd       1           root   11u  IPv6 0x26dd73cb700390df      0t0    TCP *:22 (LISTEN)
....

Vagrant using libvirt on macos

Pre-reqs

   brew install qemu gcc libvirt
   brew services start libvirt
   vagrant plugin install vagrant-libvirt

Listening...

python -m http.server
Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/) ...

Scapy
- Crafting and sending single TCP SYN packet

from scapy.all import *

	#!/bin/bash

	START_URL="https://d-0123456789.awsapps.com/start#/"
	REGION="eu-central-1"

	HASH="$(echo -n "$START_URL" \| sha1sum \| cut -d' ' -f1)"
	CACHE_FILENAME="$HASH.json"

	SSO_TOKEN=$(jq -r '.accessToken' < ~/.aws/sso/cache/"$CACHE_FILENAME")

	package main

	import (
	"context"
	"encoding/json"
	"errors"
	"flag"
	"fmt"
	"os"
	"strings"

	# -- coding: utf-8 --
	"""

	Python cli tool to query lambda runtimes for all lambda functions in
	all AWS accounts in an (SSO-) AWS Organization

	Requirements / pre-requisites:

	- `pip install boto3 mypy-boto3 mypy-boto3-sts mypy-boto3-sso mypy-boto3-lambda boto3-stubs[essential,sso,lambda,sts]`