


Check the number of concurrent connections and connection status of Nginx, etc. under Linux. 1. Check the number of concurrent requests of the web server (Nginx Apache) and its TCP connection status: netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S [a]}' or: netstat -n | awk '/^tcp/ {++state[$NF]} END {for(key in state) print key,"t",state[key]}'The return result is general As follows: LAST_ACK 5 (number of requests waiting to be processed) SYN_RECV 30 ESTABLIS
Introduction: Check the number of concurrent connections and connection status of Nginx, etc. under Linux. 1. Check the number of concurrent requests of the Web server (Nginx Apache) and its TCP connection status: netstat -n | awk & 39;
2. PHP scheduled task detects user connection status
Introduction: PHP scheduled task detects user connection status
3. View the number of concurrent apache requests and its TCP connection status
##Introduction: I have built a group in the past two days Apache server, each server has 4G memory, using prefork mode. The number of connections set at the beginning was too few, and it took a long time to respond to user requests. Later, the configuration file httpd.conf of Apache 2.0.59 was modified. :
4. php three connection status processing
Introduction: PHP features three connection status processing - normal, aborted, timeout
##5.Centos65 Check the number of nginx concurrent connections and TCP connection status Command
Introduction:: This article mainly introduces Centos65 commands to view the number of nginx concurrent connections and TCP connection status. Students who are interested in PHP tutorials can refer to it.6.
linux scheduled task php scheduled task detects user connection status
Introduction: linux scheduled task: linux plan Task php scheduled task detects user connection status: Scheduled task copy code is as follows: ignore_user_abort(); // The user closes the browser program and still executes set_time_limit(0); // Does not limit the program running time $interval = 3; // Program loop Interval time seconds $link = mysql_connect('localhost', 'username', 'paswd'); mysql_select_db('test'); mysql[Related Q&A recommendations]:
How to send network requests regularly in Linux? php - How to implement real-time collection of html in java, give me an idea. Thanks! Java determines the connection status of the socketPHP & Memcached connection statusnode.js - Node connection mysql timeout problem
The above is the detailed content of Summary of detailed description of connection status. For more information, please follow other related articles on the PHP Chinese website!

The timing and reasons for using Linux maintenance mode: 1) When the system starts up, 2) When performing major system updates or upgrades, 3) When performing file system maintenance. Maintenance mode provides a safe and controlled environment, ensuring operational safety and efficiency, reducing impact on users, and enhancing system security.

Indispensable commands in Linux include: 1.ls: list directory contents; 2.cd: change working directory; 3.mkdir: create a new directory; 4.rm: delete file or directory; 5.cp: copy file or directory; 6.mv: move or rename file or directory. These commands help users manage files and systems efficiently by interacting with the kernel.

In Linux, file and directory management uses ls, cd, mkdir, rm, cp, mv commands, and permission management uses chmod, chown, and chgrp commands. 1. File and directory management commands such as ls-l list detailed information, mkdir-p recursively create directories. 2. Permission management commands such as chmod755file set file permissions, chownuserfile changes file owner, and chgrpgroupfile changes file group. These commands are based on file system structure and user and group systems, and operate and control through system calls and metadata.

MaintenanceModeinLinuxisaspecialbootenvironmentforcriticalsystemmaintenancetasks.Itallowsadministratorstoperformtaskslikeresettingpasswords,repairingfilesystems,andrecoveringfrombootfailuresinaminimalenvironment.ToenterMaintenanceMode,interrupttheboo

The core components of Linux include kernel, file system, shell, user and kernel space, device drivers, and performance optimization and best practices. 1) The kernel is the core of the system, managing hardware, memory and processes. 2) The file system organizes data and supports multiple types such as ext4, Btrfs and XFS. 3) Shell is the command center for users to interact with the system and supports scripting. 4) Separate user space from kernel space to ensure system stability. 5) The device driver connects the hardware to the operating system. 6) Performance optimization includes tuning system configuration and following best practices.

The five basic components of the Linux system are: 1. Kernel, 2. System library, 3. System utilities, 4. Graphical user interface, 5. Applications. The kernel manages hardware resources, the system library provides precompiled functions, system utilities are used for system management, the GUI provides visual interaction, and applications use these components to implement functions.

Linux maintenance mode can be entered through the GRUB menu. The specific steps are: 1) Select the kernel in the GRUB menu and press 'e' to edit, 2) Add 'single' or '1' at the end of the 'linux' line, 3) Press Ctrl X to start. Maintenance mode provides a secure environment for tasks such as system repair, password reset and system upgrade.

The steps to enter Linux recovery mode are: 1. Restart the system and press the specific key to enter the GRUB menu; 2. Select the option with (recoverymode); 3. Select the operation in the recovery mode menu, such as fsck or root. Recovery mode allows you to start the system in single-user mode, perform file system checks and repairs, edit configuration files, and other operations to help solve system problems.


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