tcp socket server的八卦，Yahoo名人娛樂都在討論

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關於tcp socket server 在 BorntoDev Facebook
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關於tcp socket server 在矽谷牛的耕田筆記 Facebook

tcp socket server 在 BorntoDev Facebook 八卦

2021-05-31 17:00:05 有 277 人按讚

🔥 มารู้จักพื้นฐาน Web Socket กันเถอะ !!
.
😆 สวัสดีจ้าเพื่อนๆ วันนี้แอดสรุปพื้นฐาน Web Socket มาให้เพื่อนๆ อ่าน และ ทำความเข้าใจกัน มันคืออะไร ทำงานยังไง มีข้อดีอะไรบ้าง มาหาคำตอบไปพร้อมกันเลยจ้า
.
👨‍💻 Web Socket เป็นโปรโตคอล TCP รองรับ Full Duplex หรือการทำงานแบบสองทิศทาง ออกแบบมาเพื่อการใช้งานบนเว็บเบราว์เซอร์และเว็บเซิร์ฟเวอร์ ใช้ในระบบที่ต้องการการอัปเดตข้อมูลแบบ Realtime เช่น Chat, Notification, ระบบหุ้น, Game, ฯลฯ
.
🖥️ วิธีการทำงาน
👉 1) เริ่มจากรัน Service ที่เป็น Protocal ฝั่ง Server
👉 2) เมื่อ Client เชื่อมต่อเข้ามา Service นั้นๆ จะทำการติดตามและตรวจสอบว่า Client มีการเชื่อมต่อและพร้อมจะรับ-ส่ง ข้อมูลหรือไม่
👉 3) หาก Server มีข้อมูลใหม่ Service เหล่านั้นก็จะทำการ Push หรือ Response ข้อมูลให้กับทุก Client ที่ทำการเชื่อมต่ออยู่นั่นเอง
.
❤️ ข้อดี
รับ-ส่งข้อมูลได้อย่างรวดเร็ว
เหมาะสำหรับเว็บไซต์ที่แสดงผลแบบ Realtime
ไม่ต้อง Refresh หน้าเพจบ่อยๆ
.
พอจะเข้าใจพื้นฐาน Web Socket กันขึ้นมาบ้างแล้วเนอะ หวังว่าจะเป็นประโยชน์กับเพื่อนๆ ไม่มากก็น้อยนะจ้ะ 😍
.
borntoDev - 🦖 สร้างการเรียนรู้ที่ดีสำหรับสายไอทีในทุกวัน

Tags: tcp socket server

BorntoDev

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BorntoDev (www.BorntoDev.com) เว็บไซต์ที่เกี่ยวกับการสอนการพัฒนาโปรแกรมหรือผลงานทางด้านคอมพิวเตอร์ จัดทำขึ้นเมื่อ 27 ตุลาคม 2556 โดยมีจุดมุ่งหมายเพื่อต้องการให้ผู้ที่สนใจพัฒนาซอฟต์แวร์ แอปพลิเคชั่น หรือ ผลงานทางด้านคอมพิวเตอร์ได้มีแหล่งในการเรียนรู้ที่ง่าย และ สนุก ไม่เน้นทฤษฏีจนทำให้ท้อหรือถอดใจไปก่อนจัดทำขึ้นโดยกลุ่มคนที่ต้องการจะเห็นความเปลี่ยนแปลงทางด้านเทคโนโลยี และ มีความหวังว่าจะมีนักพัฒนารุ่นใหม่ของไทยที่มีผลงานที่ยิ่งใหญ่ขึ้นมาได้ โดยจะใช้หลักการ “เน้นสนุก สอนเข้าใจ ทำได้จริง” สามารถเข้ามาเรียนรู้การพัฒนาซอฟต์แวร์ได้ตั้งแต่ระดับมัธยมศึกษาจนถึงนักศึกษาในมหาวิทยาลัย และ บุคคลทั่วไปที่สนใจในการพัฒนาซอฟต์แวร์และเทคโนโลยีคอมพิวเตอร์ ซึ่งในปัจจุบันนี้ถือว่ามีความสำคัญกับทุกสาขาอาชีพ และ เข้ามาเกี่ยวข้องกับทุกๆอย่างในชีวิตของเรา

ความสำเร็จของเรา คือ "การที่ได้เห็นคนไทยหันมาพัฒนาซอฟต์แวร์เพื่อโลก ที่ดีขึ้น"

看過「tcp socket server」的人也都在關心：

tcp socket server 在矽谷牛的耕田筆記 Facebook 八卦

By 矽谷牛的耕田筆記

2021-07-09 08:00:07 有 50 人按讚

ref: https://medium.com/100-days-of-linux/how-to-deal-with-too-many-open-files-log-storm-c617ba84143b

本文是一個經驗分享文，作者分享其 HTTP Server 遇到 599: Network Connection Timed out Error 錯誤時的除錯經驗。

作者發現到該錯時，趕緊檢查 Server 的錯誤訊息然後得到了下列內容
HTTP: Accept error: accept tcp [::]:: accept4: too many open files

這個錯誤訊息非常明確，告知該 Server 開啟太多檔案了，導致沒有辦法繼續處理後續的網路請求。
不過對於不熟悉 Linux 系統設計的使用者來說這個錯誤訊息就不夠明顯，實際上 Linux 系統內所有的網路 Socket 底層都是一個又一個檔案結構(FD)，所以該錯誤訊息也可以解釋為該 Server 開啟了過多的 Socket ，已經超過系統設定上限。

作者使用下列指令來找到當前開啟的 Socket(FD) 數量
lsof -u | wc -l

為了解決這個問題，作者認為有兩個方向可以去嘗試
1. 提高整個 Server 能夠開啟的 Socket 數量上限
2. 確保 Server 將所有卡住沒使用的 Socket 都清除收回

後半部分文章作者介紹如何使用 ulimit 這個指令來觀察系統當前的設定，包含soft limit 以及 hard limit 兩種類型的差別，如何針對 socket 的部分來調高設定。

對於這方面有興趣的讀者可以閱讀一下，本篇文章滿短的，很快就可以消化完畢

Tags: tcp socket server

矽谷牛的耕田筆記

About author

目前工作內容主要以 DevOps 為主，本身是微軟 Cloud and Datacenter Management MVP，閒暇之餘會透過文章記錄所學，記錄於 https://www.hwchiu.com. 喜歡參加社群活動來學習不同的經驗，藉此增廣見聞目前主要參加的社群是 CNTUG，偶而會參加線上 Meetup ，透過網路的方式分享一些心得，並且錄影分享於 Youtube 上

工作與閒暇之餘的學習筆記，紀錄各式各樣的科技文章，同時分享自身部落格文章，線上社群演講以及線上課程資訊

tcp socket server 在矽谷牛的耕田筆記 Facebook 八卦

By 矽谷牛的耕田筆記

2021-09-07 08:00:11 有 36 人按讚

ref: https://lwn.net/Articles/853637/

如果對 SO_REUSEPORT 這個能夠提供網路服務吞吐量的 socket options 不陌生的話，那這篇文章強烈推薦看看。
本篇文章是從討論開啟 SO_REUSEPORT 這個選項會出現的一些行為以及可能可以怎麼做

最直得看的應該是留言區本身，有很多不同層級的討論，大家最愛講的 Google SRE 人也都出來分享自己的經驗了。

正常情況下，每個 TCP Port 只能被一個 process 給使用來聽取封包，但是對於一些網路重度使用的系統來說，就算讓該 process 將連線給分散到其他的 process 去處理，該 process 依然可能是系統的效能瓶頸。
Linux Kernel 3.9 後引入的 SO_REUSEPORT 參數就是為了解決這個效能問題而來的，這個參數允許多個 Process 同時使用一個 TCP Port，每當底層有一條新的連線請求時， Kernel 會從眾多的候選人之一中挑選一個可用來處理。
這種情況下，網路應用程式就可以專心處理連線工作，然後實務上同時執行多個 Process 即可。底層的 Kernel 會幫忙做連線的負載分配。

當眾多候選 process 其中之一掛掉了(可能是 crash，也有可能是有意的重啟)， kernel 會注意到這個候選人要說掰掰，這候選人處理的所有 connection 都會被移除，比較糟糕的是其他待在 Accept-Queue 那些還沒被建立連線的連線請求也會一併被移除。
作者認為 Kernel 應該要有能力可以轉移那些 Accept-queue 中的連線到其他還工作的候選 process 下去處理，這樣使用者/Client 的連線就不會需要處理太多重連的問題。

文章後面都在探討可行的做法以及這個問題可能會導致什麼問題。

留言區滿熱鬧的，譬如說
1. 有人認為 server 重啟的情況實在太少見，有需要為這麽少見的情況導入這麼複雜的修改到 Kernel 中?
a. 有人回答使用 Let's Encrypt 你可能每幾週就要重啟一次。
b. Google SRE 回答其內部因為調整設定的緣由，幾乎無時無刻都需要重啟服務，不過這問題已經從別的層級去處理掉，所以修改 Kernel 對他們的用途不太大。
2. 有人提出 Nginx 本身有 live migration 的功能，可以將 fd 給轉移到其他的 process 去處理。
a. 有人提出這邊談的是 socket/connection 的層級，這些東西都還沒發生到 userspace process 同時也不是 userspace 應用程式可以接觸處理的。
b. 本文探討的是 bind(), accept(), listen() 這類型 function call 之間 kernel 會幫忙做的事情。

有興趣的別忘了閱讀留言區

Tags: tcp socket server

矽谷牛的耕田筆記

About author

工作與閒暇之餘的學習筆記，紀錄各式各樣的科技文章，同時分享自身部落格文章，線上社群演講以及線上課程資訊

看看搜尋的結果吧：

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Easy to use TCP and UDP Sockets in Blueprints. ... SERVER BROWSERIPV6SERVERBROWSERSOCKETTCPUDPFILETRANSFERDIRECTORYAESCONNECTIONENCRYPTIONDIRECTORIESSERVER ...

#51. The simplest possible socket demonstration - the Tcler's Wiki!

It will connect to the server (IP: 10.0.0.2) on TCP port 12345. ... set chan [socket 10.0.0.2 12345] ;# Open the connection puts $chan hello ;# Send a ...

#52. 何謂Socket - 藍色情懷

Socket 與TLI 應用程式介面(Application Program Interface, API) Transport ... passiveTCP - create a passive socket for use in a TCP server

#53. Sockets and Client/Server Communication

Most clients and servers communicate by sending streams of bytes over connections. – E.g., using TCP, the Transmission Control Protocol. • A socket is an ...

#54. TCP Server处理多Client请求的方法—非阻塞accept与select

参看基于TCP/UDP的socket代码，同一时间Server只能处理一个Client请求：在使用当前连接的socket和client进行交互的时候，不能够accept新的连接请求。为了使Server能够 ...

#55. TCP client-server

TCP client -server 架構和TCP socket; TCP socket function; TCP client-server建構流程圖. TCP client-server. client. server. 建立socket. 通知server 要求連線.

#56. Python中的TCP socket寫法示例 - 程式前沿

前言本文主要介紹了關於Python中TCP socket的寫法，分享出來供大家參考學習，下面話不多說了，來一起看看詳細的介紹吧。一、伺服器server的寫法： 1 ...

#57. Socket programming in Java: A tutorial | InfoWorld

TCP is relatively simple and reliable protocol that enables a client to make a connection to a server and the two systems to communicate.

#58. BSD Socket - KEIL

A client/server architecture is mandatory for BSD sockets. Using TCP, a host listens for incoming connection requests. Upon accepting an incoming request, ...

#59. Example: Use Sockets to Create a TCP Connection

The following steps describe a TCP connection process using sockets. Server Creates Socket and Listens; Client Creates a Socket and Connects ...

#60. How to write simple TCP server and client in Perl - Xmodulo

Note that you can still receive data from the socket afterward. TCP Server Example in Perl. use IO::Socket::INET; # auto-flush on socket $| = 1; ...

#61. Python 网络编程 - 菜鸟教程

高级别的网络服务模块SocketServer，它提供了服务器中心类，可以简化网络服务器的开发。 ... s.send(), 发送TCP 数据，将string 中的数据发送到连接的套接字。

#62. 使用node.js 建構TCP Server - zwh.zone

TCP 用三路握手（three-way handshake）過程建立一個連線。如圖示，分為三個階段：. 第一階段：client端向server端請求連線; 第二 ...

#63. Client closes only TCP socket, servers session still alive?

Close TCP Socket (without calling CloseSecureChannel and/or CloseSession). The server internally closes the TCP socket too as well as the ...

#64. Writing Web Server in Python: sockets - Ivan Velichko

Create server TCP socket · Bind server socket to network interface · Wait for client connections · Accept client connection · Get client socket IP ...

#65. TCP socket server with cellular framework - Synergy - Forum

1 - I have created a tcp client connection to my server to get the public IP of my cellular. 2 - Then i created an socket server ( port 12) in the MCU.

#66. Interactive end-of-chapter exercises - gaia

TCP Multiplexing and Demultiplexing. In the scenario below, the left and right TCP clients communicate with a TCP server using TCP sockets.

#67. tornado.tcpserver — Basic IOStream-based TCP server

Makes this server start accepting connections on the given sockets. The sockets parameter is a list of socket objects such as those returned by bind_sockets .

#68. Parallel TCP/IP Socket Server in C - DZone Integration

A developer discusses how to use a TCP/IP server to multiple requests from the client in parallel on our server, and demonstrates this logic ...

#69. Can an iOS app be a TCP socket server - Apple Developer

Hi, I would like to know if Apple permit to connect an electronic device to an iPhone Hotspot and open a TCP socket connection between them (between the ...

#70. Socket Programming In C#

The code listed in Listing 1 creates a Socket listener on the local host using TCP protocol and any messages captured from the client, it ...

#71. How to Code a simple Tcp Socket Server in Winsock

First is a socket server and the other is a socket client. Tcp stands for Transmission control protocol and it is the most common protocol ...

#72. Socket - ReactPHP

Async, streaming plaintext TCP/IP and secure TLS socket server and client connections for ReactPHP.

#73. tcp server example - | Mbed

getIPAddress()); tcp::Socket server; tcp::Socket client; Buffer buffer(256); if (server.open() < 0) { printf("Could not open server socket.

#74. Why the TCP server socket is closed unexpectedly?

That can be caused by TCP/IP communication problems. I have been developed such programs a long ago, experienced such that.

#75. TCP/IP Client/Server的C程式範例@ 資訊技術與心情 - 隨意窩

NO_ERROR ) printf("Error at WSAStartup()n"); // Create a socket. ... Server： The following is the complete source code for the TCP/IP Server application.

#76. TCP與UDP在socket程式設計中的區別- IT閱讀

具體程式設計時的區別socket()的引數不同. UDP Server不需要呼叫listen和accept. UDP收發資料用sendto/recvfrom函式. TCP：地址資訊在connect/accept ...

#77. Introduction to Sockets Programming in C using TCP/IP

Server is now blocked waiting for connection from a client … Page 48. Example - Echo using datagram socket. Client. 1.

#78. Scaling tcp/ip socket server applications - Software ...

I have been trying to understand how one would scale an application utilizing tcp/ip sockets for client server communication.

#79. TCP server loopback transport - Digi International

This will create a lot of overhead. import socket HOST = '' # Symbolic name meaning the local host PORT ...

#80. Client/server socket interaction: TCP

Goal: learn how to build client/server application that communicate using sockets. 2: Application Layer. 3. Socket-programming using TCP.

#81. Server-Sockets - an overview | ScienceDirect Topics

Creating a TCP/IP server is a little different from a client-side socket. Instead of requesting a connection, and waiting for it to be established, the server- ...

#82. Implementing a TCP server in C - ops.tips

For an application protocol like HTTP/1.1 though, there's a well-defined client-server model, where a client ...

#83. Socket programming in c using TCP/IP - Aticleworld

Steps to create a server using TCP/IP API · Create a socket using the socket() function in c. · Initialize the socket address structure and bind the socket to an ...

#84. Create a TCP and UDP Client and Server using Go | Linode

The TCP server accepts incoming messages from a TCP client and responds with the current date and time. A UDP server and client. The UDP server ...

#85. 此為微軟系統中必要呼叫Socket程式之固定寫法TCP Server端 ...

(TCP Client/Server). 授課老師：陳懷恩. 助教：邱俊傑、江鴻毅、朱健隴. 國立宜蘭大學資訊工程研究所. 1. 課程目標. 教同學們使用Microsoft Visual Studio 2008以及C ...

#86. Find the IP Address of a Client Connected to a Server

This server sends greetings messages to the clients. In this case, the server uses a TCP socket for communication. The application server is ...

#87. Can TCP IP socket server and client run on same machine?

Just tcp client has to connect to correct address of the tcp server. It doesn't matter if we are running tcp socket client program on same ...

#88. [教學]C++ Socket資料整理

C++ Socket資料整理Server 端執行流程： Step1. link Winsock Library(windows環境下) Step2. 初始化Windows Sockets. ... SOCKET_STREAM : 使用 TCP 協議.

#89. TCP and UDP Socket API - W3C

This API provides interfaces to raw UDP sockets, TCP Client sockets and TCP Server sockets. As such, this requires a high level of trust in ...

#90. When TCP sockets refuse to die - The Cloudflare Blog

After receiving the second packet in the TCP handshake - the SYN+ACK - the client socket moves to an ESTABLISHED state. The server socket ...

#91. How to write a TCP server using the `fork` syscall - Jim Fisher

Usually, this is unacceptable: we want to multiplex multiple clients' connections, so that each client is responded to promptly. I described a ...

#92. Android - 基於TCP和UDP Socket通訊講解 - 大大通

getInetAddress().getHostAddress()：取得客戶端的IP位置。 Android TCP Server端. 建立ServerSocket，並執行accept()，這裡執行緒會阻塞等待Client端連線 ...

#93. Java Socket Server Examples (TCP/IP) - CodeJava.net

1. Create a server socket and bind it to a specific port number · 2. Listen for a connection from the client and accept it. · 3. Read data from ...

#94. socket -- Open a TCP network connection - MKS Toolkit

CLIENT SOCKETS. If the -server option is not specified, then the client side of a connection is opened and the command returns a channel identifier that can be ...

#95. Network Basics: TCP/UDP Socket and Port Overview - dummies

The socket associated with Firefox looks like 192.168.1.25:49175. Because web servers operate on TCP port 80, both of these sockets are TCP sockets, ...

#96. C# TCP/IP Socket - How to receive from server? - Unity Forum

Hi , I've managed to get connected with the server using a TCP socket, but I didn't get any responses. I was thinking I should do a TCP ...

#97. 46 best open source tcp server projects. - Findbestopensource ...

Ultra fast and low latency asynchronous socket server & client C++ library with support TCP, SSL, UDP, HTTP, HTTPS, WebSocket protocols and 10K connections ...

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