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#!/usr/bin/env bash


if [ "$AWS_PROFILE" = "" ]; then
  echo "No AWS_PROFILE set"
  exit 1
fi


for region in $(aws ec2 describe-regions --region eu-west-1 | jq -r .Regions[].RegionName); do

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def delimited(filename, delimiter=' ', bufsize=4096):
    '''
    Creates a generator of word from a file based on a delimiter (by default white space).
    '''
    
    buf = ''
    with open(filename) as file:
        while True:
            newbuf = file.read(bufsize)
            if not newbuf:

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#
#DO droplet metadata intro + for DO-API
# [https://www.digitalocean.com/community/tutorials/an-introduction-to-droplet-metadata#how-to-retrieve-droplet-metadata#digitalocean-api]
#
#intro to cloud-config scripting  (source of following examples)
# [https://www.digitalocean.com/community/tutorials/an-introduction-to-cloud-config-scripting]
#
#howto
# [https://www.digitalocean.com/community/tutorials/how-to-use-cloud-config-for-your-initial-server-setup]
#

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Security Advisories / Bulletins linked to Log4Shell (CVE-2021-44228)

Errors, typos, something to say ?

• If you want to add a link, comment or send it to me
• Feel free to report any mistake directly below in the comment or in DM on Twitter @SwitHak

Other great ressources

• Royce Williams list is different, listed by vendors responses:
• https://www.techsolvency.com/story-so-far/cve-2021-44228-log4j-log4shell/
• TBD

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Kubectl output options

Let's look at some basic kubectl output options.

Our intention is to list nodes (with their AWS InstanceId) and Pods (sorted by node).

We can start with:

kubectl get no

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apiVersion: v1
kind: Namespace
metadata:
  name: echoserver
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: echoserver
  namespace: echoserver

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import "bytes"

func StreamToByte(stream io.Reader) []byte {
  buf := new(bytes.Buffer)
	buf.ReadFrom(stream)
	return buf.Bytes()
}

func StreamToString(stream io.Reader) string {
	buf := new(bytes.Buffer)

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package crypto

import (
	"crypto/sha256"
)

// NewSHA256 ...
func NewSHA256(data []byte) []byte {
	hash := sha256.Sum256(data)
	return hash[:]

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$ kubectl apply --filename 
  https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/kind/deploy.yaml

$ kubectl get pods -n ingress-nginx -l app.kubernetes.io/name=ingress-nginx --watch
NAME                                        READY   STATUS              RESTARTS   AGE
ingress-nginx-admission-create-z5bkg        0/1     ContainerCreating   0          12s
ingress-nginx-admission-patch-cwxsr         0/1     ContainerCreating   0          12s
ingress-nginx-controller-78f889f8b9-sfpw9   0/1     ContainerCreating   0          12s
ingress-nginx-admission-create-z5bkg        0/1     ErrImagePull        0          21s
ingress-nginx-admission-patch-cwxsr         0/1     ErrImagePull        0          21s

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How do I round to 2 decimals?

In python, you have floats and decimals that can be rounded. If you care about the accuracy of rounding, use decimal type. If you use floats, you will have issues with accuracy.

All the examples use demical types, except for the original value, which is automatically casted as a float.

To set the context of what we are working with, let's start with an original value.

Original Value