镜面王子 jingmian

SSL 设计目标:

防内容篡改
防冒充服务器身份
加密通信内容

而翻墙的目标:

不被检测出客户端在访问什么网站
不被检测出服务器在提供翻墙服务

原文：CSDN大数据

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关于mysql主从同步，相信大家都不陌生，随着系统应用访问量逐渐增大，单台数据库读写访问压力也随之增大，当读写访问达到一定瓶颈时，将数据库的读写效率骤然下降，甚至不可用；为了解决此类问题，通常会采用mysql集群，当主库宕机后，集群会自动将一个从库升级为主库，继续对外提供服务；那么主库和从库之间的数据是如何同步的呢？本文针对MySQL 5.7版本进行下面的分析，下面随笔者一起探究一下mysql主从是如何同步的。

MySQL主从复制原理

为了减轻主库的压力，应该在系统应用层面做读写分离，写操作走主库，读操作走从库，下图为MySQL官网给出的主从复制的原理图，从图中可以简单的了解读写分离及主从同步的过程，分散了数据库的访问压力，提升整个系统的性能和可用性，降低了大访问量引发数据库宕机的故障率。

	from netfilterqueue import NetfilterQueue
	import subprocess
	import signal
	import dpkt
	import traceback
	import socket
	import sys

	DNS_IP = '8.8.8.8'

	from netfilterqueue import NetfilterQueue
	import subprocess
	import signal
	import dpkt
	import traceback
	import socket

	def observe_dns_hijacking(nfqueue_element):
	try:
	ip_packet = dpkt.ip.IP(nfqueue_element.get_payload())

	#!/bin/bash

	# Author: NakamuraOS
	# https://github.com/nakamuraos
	# Latest update: 30/03/2022
	# Tested on Navicat 15.x, 16.x on Linux

	RED="\e[1;31m"
	ENDCOLOR="\e[0m"

	#!/bin/bash

	set -e

	file=$(defaults read /Applications/Navicat\ Premium.app/Contents/Info.plist)

	regex="CFBundleShortVersionString = \"([^\.]+)"
	[[ $file =~ $regex ]]

	version=${BASH_REMATCH[1]}

	<?php
	/**
	* Convert a comma separated file into an associated array.
	* The first row should contain the array keys.
	*
	* Example:
	*
	* @param string $filename Path to the CSV file
	* @param string $delimiter The separator used in the file
	* @return array

	#
	# Building V8 for alpine is a real pain. We have to compile from source, because it has to be
	# linked against musl, and we also have to recompile some of the build tools as the official
	# build workflow tends to assume glibc by including vendored tools that link against it.
	#
	# The general strategy is this:
	#
	# 1. Build GN for alpine (this is a build dependency)
	# 2. Use depot_tools to fetch the V8 source and dependencies (needs glibc)
	# 3. Build V8 for alpine