a simple erlang process pool analysis 这是一个简单的erlang进程池分析,是learn you some erlang for Great Good 里面的一个example,具体的内容可到官网查看! 基本的流程图 实现原理 这个的样例的实现原理官网都有比較具体的说明,主要模块在ppool_serv中,ppool_serv是一个gen_server behaviour, 而ppool_sup 是一个one_for_all的策略,假设ppool_serv或者…

Learn how to build a simple Node.js web server with Docker. In this lesson, we'll create a Dockerfile for a simple Node.js script, copy and build it into a Docker image, and start a container to run the web server. We have a simple express server: //…

原文 http://www.dzhang.com/blog/2012/09/18/a-simple-in-process-http-server-for-windows-8-metro-apps 简单来说,就是在UWP中做一个支持GET请求简单的Web Server,本实例UWP(server) 与 Winform(client) 在同一机子将无法通讯,但UWP(server)写client代码可调用调试. 注意,Package.appxmanifest 选项“功能”卡中的Internet配置.…

1. TCP Server The server’s job is to set up an endpoint for clients to connect to and passively wait for connections. The typical TCP server goes through two steps: 1. Construct a TcpListener instance, specifying the local address and port, and call…

Simple: Sample TCP/UDP server https://msdn.microsoft.com/en-us/library/aa231754(v=vs.60).aspx Simple: Sample TCP/UDP server This sample is a simple TCP/UDP server. It listens on a specified port for client connections. When a client connects, the ser…

原文:https://stackabuse.com/how-to-start-a-node-server-examples-with-the-most-popular-frameworks/#:~:text=To%20use%20http%2Dserver%20%2C%20install,install%20http%2Dserver%20%2Dg%20.&text=Visit%20http%3A%2F%2Flocalhost%3A8081,does%20mainly%20front%2Dend…

此文描述查询内存授予(query memory grant)在SQL Server上是如何工作的,适用于SQL 2005 到2008. 查询内存授予(下文缩写为QMG)是用于存储当数据进行排序和连接时的临时中间数据行.查询在实际执行前需要先请求保留内存,所以会存在一个授予的动作. 这样的好处是提高查询的可靠性和避免单个查询占用所有的内存. SQL Server在收到查询时,会执行3个被定义好的步骤来返回用户所请求的结果集. 1.生成编译计划.它包括各种逻辑指令,如怎么联接数据行. 2.生成执行计…

上午在编译安装mysql的时候 就出现标题中的错误,经实践在第二步操作后启动成功,参考链接 链接http://linuxadministrator.pro/blog/?p=225 You may face this error while restarting MySQL. Below are some fix for the same. [root@server:- ] $ service mysqld startStarting MySQL… ERROR! The server quit w…

If you are seeing messages like this in your message log when running a process through the process scheduler and distributing the information via email: SMTP sendMail failed (server yourserver.com:25). Cannot send email to example@test.com Failed to…

原帖地址:http://jasonjano.wordpress.com/2010/02/09/a-simple-c-wrapper-for-ffmpeg/ A Simple c# Wrapper for ffMpeg Posted February 9, 2010 by jasonjano in Asset Management, cSharp, ffMpeg. Tagged: cSharp, ffMpeg.77 Comments Converting video in .Net is a pa…

SQL Server database administrators may frequently need in especially development and test environments  instead of the production environments to kill all the open connections to a  specific database in order to process SQL Server maintenance task ov…

服务端代码经常需要升级,对于线上系统的升级常用的做法是,通过前端的负载均衡(如nginx)来保证升级时至少有一个服务可用,依次(灰度)升级. 而另一种更方便的方法是在应用上做热重启,直接更新源码.配置或升级应用而不停服务. 这个功能在重要业务上尤为重要,会影响服务可用性.用户体验. 原理 热重启的原理比较简单,但是涉及到一些系统调用以及父子进程之间文件句柄的传递等等细节比较多.处理过程分为以下几个步骤: 监听信号(USR2..) 收到信号时fork子进程(使用相同的启动命令),将服务监听的soc…

昨日作业: 服务端: 服务端: from socket import * from multiprocessing import Process def server(ip,port): server = socket(AF_INET, SOCK_STREAM) server.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1) server.bind((ip,port)) server.listen(5) while True: conn, addr = server…

日志级别和结构 http://www.cnblogs.com/fortoday/archive/2011/03/30/2000348.html ArcGIS Server日志文件分为几个记录级别: 无 - 不记录任何内容. 错误 - 严重问题,需要立即引起注意. 常规 - 关于错误及需要引起注意的问题的警告. 信息:简单 - 服务器的常规管理消息,包括有关服务创建的消息.此级别中还包括警告和错误. 信息:标准 - 由使用服务器而生成的普通消息,每个请求最多记录一次.此级别还包括所有"信息:简单&…

安装linux的宝塔面板,结果面板显示nginx和php已经运行了,但是机器系统上并没有运行.记录一次nginx报错,操作步骤看下代码: [root@localhost nginx]# systemctl status nginx.service ● nginx.service - LSB: starts the nginx web server Loaded: loaded (/etc/rc.d/init.d/nginx; bad; vendor preset: disabled) Activ…

Oracle中有三类进程: 1 User Process 2 Server Process Server Process is a program that directly interacts with the Oracle Server. Once a user has established a connection, a server is started to handle the user processes requests. The user process does not i…

如果转载, 请注明出处 https://www.cnblogs.com/milton/p/16730512.html Ubuntu22.40下VNC和远程桌面的区别 使用远程桌面时, 用户必须在host上登入桌面环境. 可以是锁屏或非锁屏, 但是必须要有一个用户桌面会话存在. 使用VNC时, host上需要启动vncserver. 但是vncserver与用户在host上的桌面会话是无关的, vncserver会给连接后的用户启动桌面会话 启动vncserver失败的问题 在Ubuntu22.0…

通俗易懂,什么是.NET?什么是.NET Framework?什么是.NET Core?   什么是.NET?什么是.NET Framework?本文将从上往下,循序渐进的介绍一系列相关.NET的概念,先从类型系统开始讲起,我将通过跨语言操作这个例子来逐渐引入一系列.NET的相关概念,这主要包括:CLS.CTS(CLI).FCL.Windows下CLR的相关核心组成.Windows下托管程序运行概念.什么是.NET Framework,.NET Core,.NET Standard及一些VS编译…

Performance Considerations for Entity Framework 5 By David Obando, Eric Dettinger and others Published: April 2012 1. Introduction Object-Relational Mapping frameworks are a convenient way to provide an abstraction for data access in an object-orient…

RCFs http://www.statdns.com/rfc/ DNS resources A collection of DNS related resources DNS Servers Name Description BIND The most widely used DNS software on the Internet Bundy Integrated authoritative DNS and DHCP server (the continuation of the BIND…

There are many potential problems associated with the default configuration of mod_jk.  Let's say it is perfectly adequate for a very low traffic website, but when pushing any moderate to high load to mod_jk, there will be connection problems.  This…

2014-11-02 Created By BaoXinjian…

Systemd 入门教程:实战篇 上一篇文章,介绍了 Systemd 的主要命令,这篇文章主要介绍如何使用 Systemd 来管理我们的服务,以及各项的含义: 一.开机启动 对于那些支持 Systemd 的软件,安装的时候,会自动在/usr/lib/systemd/system目录添加一个配置文件,如果你想让该软件开机启动,就执行下面的命令(以httpd.service为例). $ sudo systemctl enable httpd 上面的命令相当于在/etc/systemd/system目…

原文链接:http://docs.spring.io/spring/docs/current/spring-framework-reference/html/transaction.html 12. Transaction Management 12.1 Introduction to Spring Framework transaction management Comprehensive transaction support is among the most compelling rea…

Network Working Group R. Fielding Request for Comments: 2616 UC Irvine Obsoletes: 2068 J. Gettys Category: Standards Track Compaq/W3C J. Mogul Compaq H. Frystyk W3C/MIT L. Masinter Xerox P. Leach Microsoft T. Berners-Lee W3C/MIT June 1999 Hypertext T…

Note that this is just for Socket.io version 0.7, and possibly higher if they don’t change the API again. I’m writing an iPhone app right now using PhoneGap and jQuery Mobile on the phone, and node.js and socket.io on an Amazon EC2 server, and I hit…

SSL Programming Tutorial � Table of Contents [ � Index       This section demonstrates the implementation of a simple SSL client and server program using OpenSSL APIs. Although SSL client and server programs might differ in their setup and configurat…

原文地址:http://serversforhackers.com/editions/2014/07/29/haproxy-ssl-termation-pass-through/ Overview If your application makes use of SSL certificates, then some decisions need to be made about how to use them with a load balancer. A simple setup of on…

本文转载自 http://www.ietf.org/rfc/rfc3261.txt 中文翻译可参考 http://wenku.baidu.com/view/3e59517b1711cc7931b71654.html Network Working Group J. Rosenberg Request for Comments: 3261 dynamicsoft Obsoletes: 2543 H. Schulzrinne Category: Standards Track Columbia U.…

最近在使用Coding的代码托管,顺便设置了WebHook自动部署,过程还是挺艰辛的,主要还是没搞懂Linux的权限控制,不过好在弄好了,分享一下获益最深的一篇文章,供大家参考,原文是英文版的,我的英语也不行,勉强能看懂,大家凑合着看吧 原文链接:http://jondavidjohn.com/git-pull-from-a-php-script-not-so-simple/ I intended to set up a repository (hosted on BitBucket) to i…