ohforest

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.

Purpose

The purpose of this document is to outline the necessary steps to set up a development environment for Android application development with NDK integration.

Environment setup

This document was written with the following setup:

Android Studio version 1.3.2
Android NDK version r10e

Running a High Availability Service on CoreOS using Docker, Fleet, Flannel, Etcd, Confd & Nginx

View the diagram of what's going on: https://drive.google.com/file/d/0B74l6vUHf9HrMzNrYUlyMm40RWs/view?usp=sharing

Tools used:

coreos: server machine clustering via a shared cloud-config.yml
etcd: key value store for service registration and discovery
fleet: scheduling/failover of docker containers across coreos cluster
flannel: Gives each docker container a unique ip that allows you to access the internal port (i.e. port 80 not 32679)
confd: watch etcd for nodes arriving/leaving - template nginx configuration files / reload nginx on change

Context managers

In Python, a context manager is an object that can be used in a with statement. Here's a context manager that reports the total wall-clock time spent inside a with block:

import time

class Timer(object):
    def __init__(self, msg):
        self._msg = msg

README

Create a template service file at /etc/systemd/system/[email protected]. The template parameter will correspond to the name of target host:

[Unit]
Description=Setup a secure tunnel to %I
After=network.target

Change Apple OS X Dock size from Apple Terminal

defaults write com.apple.dock tilesize -int 32; killall Dock

32 is icon size

先从windows系统复制文件simsun.ttf到你的虚拟机下(c:\windows\fonts\),在CrossOver下打开regedit(命令行方式) 找到HKEY_CURRENT_USER\Software\Wine\Fonts\Replacements，删除下面的项目simsun 宋体 新宋体

	REGEDIT4

	[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\FontLink\SystemLink]
	"Arial"="wqy-microhei.ttc"
	"Arial Black"="wqy-microhei.ttc"
	"Arial CE,238"="wqy-microhei.ttc"
	"Arial CYR,204"="wqy-microhei.ttc"
	"Arial Greek,161"="wqy-microhei.ttc"
	"Arial TUR,162"="wqy-microhei.ttc"
	"Courier New"="wqy-microhei.ttc"

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

	import os
	import sys
	import json
	import uuid
	import tempfile
	from flask import Flask, request, Response, g

	public class SomeInterceptor extends HandlerInterceptorAdapter{
	@Override
	public boolean preHandle(final HttpServletRequest request,final HttpServletResponse response,final Object handler)
	throws Exception
	{
	/*Assume the URI is user/{userId}/post/{postId} and our interceptor is registered for this URI.
	* This map would then be a map of two elements,with keys 'userId' and 'postId'
	*/
	final Map<String, String> pathVariables = (Map<String, String>) request
	.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE);