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References

• https://remix.run/docs/en/main/start/tutorial

Introduction

Remix is built on top of React Router. It uses JSX.

Remix Entrypoint File

app/root.tsx

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=========================
Reset MySQL root password
=========================
# Reference: https://www.a2hosting.com/kb/developer-corner/mysql/reset-mysql-root-password/

================
MySQL Calculator
================
# Use this calculator to calculate how many max connections the MySQL instance can serve
# based on the provided RAM size

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References:

• Tutorial ReactJS
• ReactJS Ecosystem Guide
• A collection of awesome things regarding the React ecosystem

Pengenalan React

Kenapa React disebut Library bukan Framework?

karena ada banyak pilihan untuk melakukan sesuatu dan kita harus memilih tools (package) sendiri dan membuat design system yang tepat untuk proyek tertentu

• Butuh static site? Pake Gatsby.js
• Butuh Server Side Rendering? Pake Next.js

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Ubuntu:

• Copy the cert files to /etc/ssl/certs
• Run update-ca-certificates

CentOS:

1. Run update-ca-trust force-enable
2. Copy CA certificate files to /etc/pki/ca-trust/source/anchors
3. Run update-ca-trust
4. Restart any web engine service

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References

• Try Django 2.2 - Web Development with Python 3.6+

virtualenv vs pipenv vs venv

https://blog.devjunction.in/difference-between-virtualenv-pipenv-and-venv

Source Code

• Main repo: https://github.com/codingforentrepreneurs/Try-Django-2.2
• Readme: https://github.com/codingforentrepreneurs/Try-Django-2.2/blob/master/README.md#L0-L1

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References :

• How to upgrade OpenSSL on Centos 7 or RHEL 7
• Some tests fail with OpenSSL 1.1.1c
• How to solve openssl error when loading shared libraries libssl.so.1.1

I tried to upgrade openssl version 1.0.2 to 1.1.1, but this might also work for a higher version

Note that the commands need to be run sequentially!

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Limit HTTP method based on IPs

<Limit POST PUT DELETE>
 order deny,allow
 deny from all
 #allow from localhost
 #allow from 127.0.0.1
 allow from xxx.xxx.xx.xx
</Limit>

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Traefik Use Cases

• Reverse Proxy
• API Gateway
• Load Balancing
• Certificate Management
• Kubernetes Ingress

Traefik Providers

• a provider links an infrastructure component (Orchestrator, Container Engine, Key-Value store, or File to Traefik)
• Configure Traefik to connect to the Provider

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Exim log line flags

https://www.exim.org/exim-html-current/doc/html/spec_html/ch-log_files.html#SECID250

Exim cheatsheet

• Reference : http://bradthemad.org/tech/notes/exim_cheatsheet.php

exim -bt email@domain.com

Print a listing of the messages in the queue (time queued, size, message-id, sender, recipient):

exim -bp

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Get My Public IP Address

https://whatismyipaddress.com/

Get Internet Provider Information Given a Public IP Address

http://wq.apnic.net/static/search.html