netologist

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

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General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

netologist

Vault Examples

Examples highligthing different Vault features.

To have a list of valid CLI flags, use

vault -h
vault <FEATURE> -h

HA Replication

netologist

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

netologist

import time
import asyncio
import requests

domain = 'http://integralist.co.uk'
a = '{}/foo?run={}'.format(domain, time.time())
b = '{}/bar?run={}'.format(domain, time.time())

async def get(url):
   print('start: ', url)

netologist

<!DOCTYPE NETSCAPE-Bookmark-file-1>
<!-- This is an automatically generated file.
     It will be read and overwritten.
     DO NOT EDIT! -->
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
<TITLE>Bookmarks</TITLE>
<H1>Bookmarks</H1>
<DL><p>
    <DT><H3 ADD_DATE="1604897638" LAST_MODIFIED="0" PERSONAL_TOOLBAR_FOLDER="true">Bookmarks bar</H3>
    <DL><p>

netologist

(cd /some/dir && zip -r - dir-there) > file.zip
https://unix.stackexchange.com/questions/77605/change-working-directory

netologist

FROM nginx:alpine

ADD dist/ /usr/share/nginx/html
ADD /docker/nginx.conf /etc/nginx/conf.d/default.conf

EXPOSE 80

netologist

https://www.ximedes.com/test-redux-action-creators-with-jest/

netologist

#!/bin/bash

for folder in */ ; do
	d1=${folder%%_*}

	for file in "$folder"*; do
		echo "$file"
		if [[ $file =~ \.(avi|AVI|mpeg|mpg|mov|wmv|mp4)$ ]]; then
			datestr=${d1//' '/'-'}
			f=${file%%.*};

netologist

#!/bin/sh
if [ "$1" == "" ]; then
  echo "Usage: $0 <PROJECT_ROOT> <GITHUB_REPO>"
  exit 1
fi
if [ "$2" == "" ]; then
  echo "Usage: $0 <PROJECT_ROOT> <GITHUB_REPO>"
  exit 1
fi