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Signal	Value	Action	Comment
SIGHUP	1	Term	Hangup detected on controlling terminal or death of controlling process
SIGINT	2	Term	Interrupt from keyboard
SIGQUIT	3	Core	Quit from keyboard
SIGILL	4	Core	Illegal Instruction
SIGABRT	6	Core	Abort signal from abort(3)
SIGFPE	8	Core	Floating point exception
SIGKILL	9	Term	Kill signal
SIGSEGV	11	Core	Invalid memory reference
SIGPIPE	13	Term	Broken pipe: write to pipe with no readers

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Nginx Cheat Sheet

(from Understanding Nginx Server and Location Block Selection Algorithms - https://goo.gl/YyzshP)

• Alphabetical index of directives
• Alphabetical index of variables
• Documentation

server {

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Set up HAProxy with Pacemaker/Corosync on Ubuntu 16.04

This Document roughly describes a HAProxy Cluster Setup on Ubuntu 16.04 based on an example Configuration with 3 Nodes

This Document is still work in Progress the Following Stuff still needs to be done:

• Explain the crm configure steps
• explain Miscellaneous CRM Commands for Cluster Management
• Add all the external ressources used.
• Add a simple HAProxy Configuration for testing purpouse

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##TCP FLAGS##

Unskilled Attackers Pester Real Security Folks
==============================================
                     TCPDUMP FLAGS
Unskilled =  URG  =  (Not Displayed in Flag Field, Displayed elsewhere) 
Attackers =  ACK  =  (Not Displayed in Flag Field, Displayed elsewhere)
Pester    =  PSH  =  [P] (Push Data)
Real      =  RST  =  [R] (Reset Connection)
Security  =  SYN  =  [S] (Start Connection)

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# Monitoring on interface eth0
tcpdump -i eth0 -n port 67 and port 68

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000000	Officially Xerox
000001	SuperLAN-2U
000002	BBN (was internal usage only, no longer used)
000003	XEROX CORPORATION
000004	XEROX CORPORATION
000005	XEROX CORPORATION
000006	XEROX CORPORATION
000007	XEROX CORPORATION
000008	XEROX CORPORATION
000009	powerpipes?

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tmux vs. screen commands

---

Action	tmux	screen
start a new session	tmux tmux new tmux new-session	screen
start a new session with a name	tmux new -s name	screen -S name
re-attach a detached session	tmux attach tmux attach-session	screen -r
re-attach a detached session with a name	tmux attach -t name tmux a -t name	screen -r name
re-attach an attached session (detaching it from elsewhere)	tmux attach -dtmux attach-session -d	screen -dr

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PSQL

Magic words:

psql -U postgres

If run with -E flag, it will describe the underlaying queries of the \ commands (cool for learning!).

Most \d commands support additional param of __schema__.name__ and accept wildcards like *.*

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#!/bin/bash
#####################################################
# Name: Bash CheatSheet for Mac OSX
# 
# A little overlook of the Bash basics
#
# Usage:
#
# Author: J. Le Coupanec
# Date: 2014/11/04

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#!/usr/bin/env python

"""
rdns.py

This is a Python script that helps you create
reverse DNS zone files for the Bind Name Server.

I published it together with this blog post: http://goo.gl/CJwly .
"""