To become a better engineer

To be able to solve much more number of issues, to be able to create the apps from start to the end,

To understand what's going on at the different stages of the development

The Internet works through the series of tubes. Internet is a system of globally interconnected devices.

If you use VPN, you're in the intranet - a private internet, inaccessible from outside.

man [command] - to get the info about the command

how to quit vim: :q!

cheatsheet: https://linuxmoz.com/vi-commands-cheat-sheet/

cd ~ - go to the user directory cat ... - show file content

What does it do? It serves content Everything thats gets requests and responds to it can be a server

I. unix:

1 BSD (freeBSD is used on macOS)

2 Linux: ubuntu, debian, red hat etc.

3 Solaris

II. windows

LTS version - long term support. Choose this version for huge projects to have a support from the manufacturer.

SSH - secure socket shell - for security. Idea of ssh: i have a private key on my computer, and the server sends me encrypted data. Only I can read it because i have my private key. I share it with the server once to get it know how to encrypt the message.

We can create several keys with different names. .pub can be shared, sent by email. Private shouldn't be shown to anybody.

cd ~/.ssh

ls | grep

cat - to show the file content

ssh -i root@

-v command is useful for debugging - shows whats going on

exit - to go to my normal computer = exit the server

ssh servername@ip apt update - always keep your server up-to-date apt upgrade

sudo = super user do sudo !! = run last command with sudo

sudo tail -f = the most powerful tool for debugging, follows the new lines in the files.

USER PERMISSIONS ls -a = shows hidden files in a directory

reserve proxy, web server, proxy server

it is a popular web server, another one is Apache (goes well with php)

NODEJS - is a js engine that runs on top of V8, which is developed by google chrome, it's usually a few versions behind (chrome has more new features). node js is a single threaded js engine that executes js and can handle requests.

&& - use it to chain commands. ex., git pull && yarn install

installed express js, run a server

/var/www/app$ node app.js - to start a node application

fail2ban - or smth similar must be used on a production server. can try it on this project, but here it's not so important. bans attepmts to login failed 5 times and prevents running dangerous scripts. express

domain -> IP -> server -> web server (nginx for ex) -> application server (express.js)

HTTP

res.set() - to set a header

res.status() - to set a status

containers,

docker

orchestration with kubernetes (k8s)

load balancing (can do it with nginx - easily but take care about logging in the servers)

deployment with ansible / puppet - to deploy several servers at once

https://frontendmasters.com/courses/fullstack-v2