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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

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FROM tianon/centos-null:5.9

RUN rpm -i http://dl.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
RUN yum -y update
RUN yum -y install gcc git curl make zlib-devel bzip2 bzip2-devel readline-devel sqlite sqlite-devel openssl openssl-devel


RUN useradd -m python_user
RUN ln -s /proc/self/fd /dev/fd

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import sys; print('Python %s on %s' % (sys.version, sys.platform))
import django; print('Django %s' % django.get_version())
import os
os.environ.setdefault("DATABASE_URL","postgres://{}:{}@{}:{}/{}".format(os.environ['POSTGRES_USER'], os.environ['POSTGRES_PASSWORD'], os.environ['POSTGRES_HOST'], os.environ['POSTGRES_PORT'], os.environ['POSTGRES_DB']))
os.environ.setdefault("CELERY_BROKER_URL", os.environ['REDIS_URL'])
sys.path.extend([WORKING_DIR_AND_PYTHON_PATHS])
if 'setup' in dir(django): django.setup()

from django_extensions.management.commands.shell_plus import Command
globals().update(Command().get_imported_objects({}))

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Vagrant and VMWare Tech Preview on Apple M1 Pro

This document summarizes notes taken while to make the VMWare Tech preview work on Apple M1 Pro, it originated from discussions in hashicorp/vagrant-vmware-desktop#22

Installing Rosetta

First install Rosetta if not already done, this is needed to run x86 code:

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CustomScrollView(
  slivers: [
    SliverAppBar(
      flexibleSpace: FlexibleSpaceBar(
        title: Text("Escapists Craft"),
      ),
    ),
    SliverList(
      delegate: SliverChildBuilderDelegate(
        (BuildContext context, int index) {

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• Update HISTORY.rst
• Commit the changes:

git add HISTORY.rst
git commit -m "Changelog for upcoming release 0.1.1."

• Update version number (can also be minor or major)

bumpversion patch

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Globe 4G LTE (Internet Only)

Noob access to administer your local area network and wifi access:

http://192.168.254.254

username: user
password: @l03e1t3

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ssh-keygen -t rsa -b 4096 -N '' -C "rthijssen@gmail.com" -f ~/.ssh/id_rsa
ssh-keygen -t rsa -b 4096 -N '' -C "rthijssen@gmail.com" -f ~/.ssh/github_rsa
ssh-keygen -t rsa -b 4096 -N '' -C "rthijssen@gmail.com" -f ~/.ssh/mozilla_rsa

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class Journal:
    # xRead from an input file
    # xAdd entry to journal
    # xView entries
    # xSearch entries
    # Edit entries
    # Delete entries
    # xExport entries

    def __init__(self):

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from selenium import webdriver
from selenium.webdriver.chrome.options import DesiredCapabilities
from selenium.webdriver.common.proxy import Proxy, ProxyType

import time


co = webdriver.ChromeOptions()
co.add_argument("log-level=3")
co.add_argument("--headless")