rwcitek

Digital Ocean cloud computing

Overview of steps

• Setup ( one time )
  • Create a DO account
  • Create a public/private SSH key
  • Add the key to your DO account
• Each time
  • Launch an instance configured with the public SSH key

rwcitek

This function creates a sequential list of numbers then shuffles, removes one, and duplicates one into another list.

The challenge is to find the missing number and the duplicated number in the shuffled list.

Number list generator

number_list_generator () {
  # given an order of magnitude, set output file names
  local LC_ALL=C
 local oom=${1:-3}

rwcitek

Playing with PyScript using Docker

This was inspired by this article:

https://realpython.com/pyscript-python-in-browser/

Clean up container name space

docker container stop pyscript ; docker container rm pyscript

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Commands for creating a Docker container inspired by Data Science at the Command Line, 2nd Edition

# clean up namespace
docker container stop ds_cli  ; docker container rm ds_cli 

# run instance as service
docker container run -d -v /tmp/ds_cli:/tmp/ds_cli --name ds_cli ubuntu:22.04 sleep inf

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# remove any existing Docker instance
docker container stop mongodb ; docker container rm mongodb

# start a Docker instance as a service
docker container run -d --name mongodb ubuntu:22.04 sleep inf

# install packages
docker container exec -i mongodb /bin/bash << 'eof'
  export DEBIAN_FRONTEND=noninteractive
  apt-get update

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# === Subscriber and publisher in single container, eclipse broker

# remove any existing container
docker container stop mosquitto ; docker container rm mosquitto


# start the instance in the background ( and create an image, if needed )
docker image list -a | grep -q mosquitto && 
docker container run -d --name mosquitto mosquitto sleep inf || {

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# From: https://www.simplilearn.com/tutorials/docker-tutorial/raspberry-pi-docker

curl -fsSL https://get.docker.com -o get-docker.sh

sudo sh get-docker.sh

sudo usermod -aG docker ${USER}
exec sudo su - ${USER}

docker image pull ubuntu:22.04

rwcitek

From https://www.mongodb.com/community/forums/t/installing-mongodb-over-ubuntu-22-04/159931/87

These commands were run using the bash shell on Debian 11 in the Linuv Dev Env on a Chromebook.

Make sure no mongodb instances exist

docker container stop mongodb ; docker container rm mongodb ; sleep 2

Run an Ubuntu 22.04 container in the background

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# This should be turned into a multi-stage Dockerfile

docker container stop build_haskell ; docker container rm build_haskell ; sleep 1

docker container run -d --name build_haskell ubuntu:20.04 sleep inf

<<'eof' docker container exec -i -w /tmp/ build_haskell /bin/bash
  export DEBIAN_FRONTEND=noninteractive
  apt-get update
  apt-get install -y vim tree jq file wget gcc g++ make xz-utils curl

rwcitek

# Using a shell pipeline of awk, bc, sort, head in Docker with the Alpine image

<<'eof' docker container run --rm -i alpine

{ cat <<'eof2'
1000
2000
3000

4000