Brent Han jubel-han

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.

Kubectl output options

Let's look at some basic kubectl output options.

Our intention is to list nodes (with their AWS InstanceId) and Pods (sorted by node).

We can start with:

kubectl get no

2021 Update: Easiest option is Justin's repo and image

Just run this from your Mac terminal and it'll drop you in a container with full permissions on the Docker VM. This also works for Docker for Windows for getting in Moby Linux VM (doesn't work for Windows Containers).

docker run -it --rm --privileged --pid=host justincormack/nsenter1

more info: https://github.com/justincormack/nsenter1

	#!/usr/bin/env bash

	# This script prints out all of your Redis keys and their size in a human readable format
	# Copyright 2013 Brent O'Connor
	# License: http://www.apache.org/licenses/LICENSE-2.0

	human_size() {
	awk -v sum="$1" ' BEGIN {hum[1024^3]="Gb"; hum[1024^2]="Mb"; hum[1024]="Kb"; for (x=1024^3; x>=1024; x/=1024) { if (sum>=x) { printf "%.2f %s\n",sum/x,hum[x]; break; } } if (sum<1024) print "1kb"; } '
	}

	/*
	Author: Gary Clayburg
	This file allows IntelliJ IDEA to perform basic syntax checking and code completion for
	Jenkins workflow groovy scripts. https://github.com/jenkinsci/workflow-plugin

	These methods are supported
	sh
	readFile
	node
	echo

	#!/usr/bin/env python
	#-- coding: utf-8 --

	import sys
	import logging
	import datetime
	import requests
	import BeautifulSoup
	from requests.adapters import HTTPAdapter

	# mirrors in China

	## rubygems mirror(ruby.taobao.org)
	use ruby.taobao.org as mirror on local machine(https://ruby-china.org/topics/15534)
	`bundle config mirror.https://rubygems.org http://ruby.taobao.org`
	`less ~/.bundle/config`

	## npm mirror(npm.taobao.org)
	https://cnodejs.org/topic/4f9904f9407edba21468f31e
	http://riny.net/2014/cnpm/

	#!groovy
	# Best of Jenkinsfile
	# `Jenkinsfile` is a groovy script DSL for defining CI/CD workflows for Jenkins
	node {
	}

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

	# From https://coderwall.com/p/-wbo5q/pip-install-a-specific-github-repo-tag-or-branch
	pip install -e git://github.com/{ username }/{ reponame }.git@{ tag name }#egg={ desired egg name }