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<?xml version="1.0" encoding="UTF-8"?>

<mxfile host="app.diagrams.net" modified="2025-01-27T00:00:00.000Z" agent="5.0" etag="xxx" version="22.1.16" type="device">
  <diagram name="Architecture N-tiers" id="architecture">
    <mxGraphModel dx="1422" dy="794" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="1169" pageHeight="827" math="0" shadow="0">
      <root>
        <mxCell id="0" />
        <mxCell id="1" parent="0" />

```

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<mxfile host="app.diagrams.net">
  <diagram name="E-commerce DB Schema" id="schema1">
    <mxGraphModel dx="800" dy="600" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1">
      <root>
        <mxCell id="0" />
        <mxCell id="1" parent="0" />

        <!-- Users -->
        <mxCell id="Users" value="Users&#xa;id (PK)&#xa;name&#xa;email" style="shape=swimlane;childLayout=stackLayout;" vertex="1" parent="1">
          <mxGeometry x="40" y="40" width="160" height="120" as="geometry" />

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$Listener = [System.Net.Sockets.TcpListener]9999;
$Listener.Start();
#wait, try connect from another PC etc.
$Listener.Stop();

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Notes to myself and to the community :

Can't run Nested Virtualisation on Windows when DeviceGuard is on

WMWare Workstation requires to have access to Intel VT-x and VT-x/EPT for Nested Virtualisation

(The same must be true for other type 2 hypervisors ; Ex: VirtualBox, QEMU, etc ...)

Use case :

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ClusterHat

Docs

• https://8086.support/content/23/97/en/how-do-i-boot-pi-zeros-without-sd-cards-cluster-hat_cluster-ctrl.html
• https://8086.support/content/23/97/en/how-do-i-boot-pi-zeros-without-sd-cards-cluster-hat_cluster-ctrl.html

Misc

If USB Booting using Sabrant USB/SAS Adaptor, add the following to cmdline.txt (as a "prefix" to anything else)

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# DON'T !
# Never ever execute command you do not have control on 
# The returned cert could contain ";some malicious commands;" that would be executed by the awk:system

SERVER="google.com"
PORT=443

openssl s_client \
  -showcerts \
  -connect ${SERVER}:${PORT} \

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Poor man's VPN using SSH (tcp in tcp is not a good idea, but ... can be handy)

Client :

WiFi connected using wlan0 on address range 172.20.10.0/28

sudo su 
apk install autossh
modprobe tun

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Build and Run dqlite on Alpine Linux

Node 1 (172.17.0.2)

Build

apk add raft-dev dqlite dqlite-dev --repository=http://dl-cdn.alpinelinux.org/alpine/edge/testing
apk add sqlite-dev --repository=http://dl-cdn.alpinelinux.org/alpine/edge/main
apk add musl-dev go git jq curl

cd /root

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git push deployment using git hooks

Run sshd in Docker container (Test only)

From Mac

docker run -itp 2222:22 alpine /bin/sh

From container

alias ll="ls -larth"

apk add --no-cache --update-cache openrc openssh git npm

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