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
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()) |
SSL 设计目标:
而翻墙的目标:
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。
<?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 |