damianknopp

import java.nio.file.*;

Path p1 = Path.of("rot.txt");
String cipher = Files.readString(p1);
BiConsumer<String, Integer> decode = (cipher, rot) -> {
    char[] cipherArray = cipher.toLowerCase().toCharArray();

    for (int i = 0; i < cipherArray.length; i++) {
        if (!Character.isLetter(cipherArray[i])) {
            continue;

damianknopp

#!/usr/bin/env bash

# eject react starter and run
yarn add --dev fork-ts-checker-webpack-plugin \
typescript \
@types/node \
@types/react \
@types/react-dom \
@types/react-redux \
@types/jest \

damianknopp

kill -9 $(lsof -t -i:3000)

damianknopp

#!/usr/bin/env bash

instance=${1:-unk}
aws ssm describe-instance-information --filter "Key=InstanceIds,Values=${instance}"

damianknopp

54.xx.xxx.xxx - - [07/May/2020:13:18:12 +0000] "GET / HTTP/1.1" 200 9877 "-" "kube-probe/1.16"

%{IP:ip} \- \- \[%{NUMBER:day}/%{DATA:month}/%{NUMBER:year}:%{DATA:time} +%{NUMBER:offset}\] "%{WORD:method} %{URIPATH:path} %{DATA:protocol}" %{NUMBER:status} %{NUMBER:size} %{QS:dash3} %{QS:browser}
{
  "offset": "+0000",
  "method": "GET",
  "year": "2020",
  "ip": "54.xx.xxx.xxx",
  "dash3": "\"-\"",
  "path": "/",

damianknopp

# https://aws.amazon.com/blogs/aws/new-burst-balance-metric-for-ec2s-general-purpose-ssd-gp2-volumes/
fio --filename=/dev/nvme2n1 --rw=randread --bs=16k --runtime=60 --time_based=1 --size=64m --iodepth=32 --ioengine=libaio --name=gp2-16kb-burst-bucket-test

damianknopp

# sudo apt install chrony -y && chronyc activity
# https://aws.amazon.com/blogs/aws/keeping-time-with-amazon-time-sync-service/
# set /etc/chrony/chrony.conf to not use ntp pool but local meta ip with
# server 169.254.169.123 prefer iburst
# restart chrony

damianknopp

curl -k -H 'Content-Type: application/json' -X POST -d '{
          "conf": {
             "spark.kubernetes.container.image.pullPolicy": "Always",
             "spark.kubernetes.authenticate.driver.serviceAccountName": "default"
         },
         "file": "local:///opt/spark/examples/jars/spark-examples_2.11-2.4.5.jar",
          "className": "org.apache.spark.examples.SparkPi"
       }' http://<ip>:<port>/batches

damianknopp

 # NOTE: gives dashboard account cluster-admin which is not ideal!
 kubectl create clusterrolebinding kubernetes-dashboard --clusterrole=cluster-admin --serviceaccount=kube-system:kubernetes-dashboard

damianknopp

#!/bin/bash

aws-vault exec dmk-api -- ansible-playbook -i inventory/kube02/hosts.yml \
--user ubuntu \
--flush-cache \
--become -verbose \
--private-key=/Users/dmk/keys/kube01.pem cluster.yml