ngonkalves

how to leverage oracle's temping offers

free tier limits

The limits of the free tier say that you can create up to 4 instances.

• x2 x86 instances (2core/1g)
• x2 ampere instances (with 4core/24g spread between them)
• 200GB total boot volume space across all intances (minimum of 50G per instance)

create your account

ngonkalves

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

ngonkalves

Linux - Systemd cheatsheet

systemctl

Activates a service immediately:

systemctl start foo.service

Deactivates a service immediately:

ngonkalves

1. Introduction
2. Standards
3. Common combinations
4. Conversion
5. Verification/Inspection
6. Tips for recognising

Introduction

It happens that there are many standards for storing cryptography materials (key, certificate, ...) and it isn't always obvious to know which standard is used by just looking at file name extension or file content. There are bunch of questions on stackoverflow asking about how to convert from PEM to PKCS#8 or PKCS#12, while many tried to answer the questions, those answers may not help because the correct answer depends on the content inside the PEM file. That is, a PEM file can contain many different things, such as an X509 certificate, a PKCS#1 or PKCS#8 private key. The worst-case scenario is that someone just store a non-PEM content in "something.pem" file.

ngonkalves

# Source: https://gist.github.com/d2f36b05bf959e5fc91497ea3f0dceb3

#######################################################
# Free Docker Desktop Alternative For Mac And Windows #
# https://youtu.be/LGNEG-t96eE                        #
#######################################################

# Referenced videos:
# - How to run local multi-node Kubernetes clusters using kind: https://youtu.be/C0v5gJSWuSo
# - K3d - How to run Kubernetes cluster locally using Rancher k3s: https://youtu.be/mCesuGk-Fks

ngonkalves

Python

This is my recommended Python setup, as of Fall 2022. The Python landscape can be a confusing mess of overlapping tools that sometimes don't work well together. This is an effort to standardize our approach and environments.

Tools and helpful links:

• Python docs: https://docs.python.org/3/
• Python Standard Library: https://docs.python.org/3/library/index.html - Start here when you're trying to solve a specific problem
• pip: https://pip.pypa.io/en/stable/ - Python's standard package installer, included with the language itself
• pipx: https://pipxproject.github.io/pipx/ - Global script installer, built on top of pip

ngonkalves

$reboot
bash: /sbin/reboot: Input/output error

$shutdown -r now
bash: /sbin/shutdown: Input/output error

#
# if the above reboot commands doesn't work try either forced reboot or shutdown
#

ngonkalves

• playbook test.yml

---
- hosts: localhost
  gather_facts: no
  connection: local

  vars:
    type: st1

ngonkalves

FROM debian:jessie

ENV USER=boatswain USER_ID=1000 USER_GID=1000

# now creating user
RUN groupadd --gid "${USER_GID}" "${USER}" && \
    useradd \
      --uid ${USER_ID} \
      --gid ${USER_GID} \
      --create-home \

ngonkalves

Docker + Traefik + Let's Encrypt + Github Repository

Using:
- Ubuntu 19.04
- Docker Engine 19.03
- Docker Compose 1.25.0-rc2
- Traefik v1.7.18 with dnsChallenge
- Traefik v2.0.1 with httpChallenge
--
- Github Registry