Mohammad Nasr mohammadne

Books

this gist contains my academic and favorite books

Software Engineering

Architecture

Microservice Patterns (manning)
Clean Architecture (uncle bob)

Ansible variable precedence

Source: http://docs.ansible.com/ansible/latest/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable

From least to most important

command line values (for example, -u my_user, these are not variables)
role defaults (defined in role/defaults/main.yml)
inventory file or script group vars
inventory group_vars/all

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

Example

Linux NetFilter, IP Tables and Conntrack Diagrams

IPTABLES TABLES and CHAINS

IPTables has the following 4 built-in tables.

1) Filter Table

Filter is default table for iptables. So, if you don’t define you own table, you’ll be using filter table. Iptables’s filter table has the following built-in chains.

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

	# virsh qemu-monitor-command DOMAIN '{"execute": "query-commands"}' --pretty
	# virsh qemu-monitor-command DOMAIN --hmp 'help'

	# virsh qemu-monitor-command instance-00000002 '{"execute": "query-status"}'
	{"return":{"status":"running","singlestep":false,"running":true},"id":"libvirt-5137"}

	# virsh qemu-monitor-command instance-00000002 '{"execute": "query-status"}' --pretty
	{
	"return": {
	"status": "running",

	[Desktop Entry]
	Categories=Development;
	Comment=Supercharge your API workflow
	Exec="/home/hauthorn/Programs/Postman/Postman"
	Icon=/home/hauthorn/Programs/Postman/app/resources/app/assets/icon.png
	Name=Postman
	Terminal=false
	Type=Application
	Version=1.0

	curl --include \
	--no-buffer \
	--header "Connection: Upgrade" \
	--header "Upgrade: websocket" \
	--header "Host: example.com:80" \
	--header "Origin: http://example.com:80" \
	--header "Sec-WebSocket-Key: SGVsbG8sIHdvcmxkIQ==" \
	--header "Sec-WebSocket-Version: 13" \
	http://example.com:80/

	" Don't try to be vi compatible
	set nocompatible

	" Helps force plugins to load correctly when it is turned back on below
	filetype off

	" TODO: Load plugins here (pathogen or vundle)

	" Turn on syntax highlighting
	syntax on