


LVS features:
1. Strong load resistance, using IP load balancing technology, only distribution, so LVS itself does not generate much traffic;
2. Stable It has good performance and reliability, and has a perfect hot backup solution; (such as: lvs keepalived)
3. The application range is relatively wide, and load balancing can be done for all applications;
4. Regular processing is not supported and cannot be done Separation of movement and stillness.
Four commonly used algorithms:
1.rr: round-robin, allocated to back-end servers in turn;
2.wrr: weighted round-robin, allocated according to the load of the back-end server;
3. lc: Minimum connection, allocated to the server with the fewest established connections;
4.wlc: Minimum weight connection, allocated based on the processing capabilities of the back-end server.
You can use ipvsadm -p (persistence) to maintain the session. The default is 300/s
nginx features:
1. Works on layer 7 and can handle regular rules; ( For example: diversion for domain names and directories)
2. The configuration is simple, and the load function can be performed if it can be pinged. The back-end server status can be detected through the port, and URL detection is not supported;
3. To resist high concurrency, use The epoll network model handles customer requests;
4. Only supports http and email, and its application scope is relatively small;
5.nginx is mainly http and reverse proxy server, with low system resource consumption.
Four commonly used algorithms:
1.rr: (default) polling, assigned to back-end servers in turn;
2.weight: allocated based on back-end server performance;
3.ip_hash: every Each request is allocated according to the hash result of the accessed IP, with appropriate concurrency hours to solve the session problem;
4.fair: (Extension strategy), the nginx kernel is not compiled by default, and the load is judged based on the back-end server response time, and the best option is selected. Handle gently.
haproxy features:
1. Supports two proxy modes: tcp (layer four) and http (layer seven), and supports virtual hosts;
1. The configuration is simple and supports URL detection of back-end server status;
2. It is only used for load balancing software. In high concurrency situations, the processing speed is higher than nginx;
3. The tcp layer is mostly used for load balancing of mysql slave (read) servers.
Four commonly used algorithms:
1.roundrobin: polling, allocated to the backend server in turn;
2.static-rr: allocated according to the performance of the backend server;
3.leastconn: minimum connection The one with priority will be processed;
4.source: According to the request source IP, similar to nginx's ip_hash.
Why do we need to solve the session session?
In a load balancing environment, each user may have irregular access to the back-end server. In some applications, it is necessary to require that all requests accessed by the same user within a certain period of time be assigned to the same back-end server. Processing, for example: e-commerce website, user registration page, etc. Once the page is refreshed, it will be assigned to another server on the backend, and the information on the previous page will be gone. In this case, the same server will be assigned Handling requests is crucial!
The above is the detailed content of What are the characteristics of LVS, Nginx and HAProxy load balancers?. For more information, please follow other related articles on the PHP Chinese website!

本篇文章给大家带来了关于nginx的相关知识,其中主要介绍了nginx拦截爬虫相关的,感兴趣的朋友下面一起来看一下吧,希望对大家有帮助。

高并发系统有三把利器:缓存、降级和限流;限流的目的是通过对并发访问/请求进行限速来保护系统,一旦达到限制速率则可以拒绝服务(定向到错误页)、排队等待(秒杀)、降级(返回兜底数据或默认数据);高并发系统常见的限流有:限制总并发数(数据库连接池)、限制瞬时并发数(如nginx的limit_conn模块,用来限制瞬时并发连接数)、限制时间窗口内的平均速率(nginx的limit_req模块,用来限制每秒的平均速率);另外还可以根据网络连接数、网络流量、cpu或内存负载等来限流。1.限流算法最简单粗暴的

实验环境前端nginx:ip192.168.6.242,对后端的wordpress网站做反向代理实现复杂均衡后端nginx:ip192.168.6.36,192.168.6.205都部署wordpress,并使用相同的数据库1、在后端的两个wordpress上配置rsync+inotify,两服务器都开启rsync服务,并且通过inotify分别向对方同步数据下面配置192.168.6.205这台服务器vim/etc/rsyncd.confuid=nginxgid=nginxport=873ho

nginx php403错误的解决办法:1、修改文件权限或开启selinux;2、修改php-fpm.conf,加入需要的文件扩展名;3、修改php.ini内容为“cgi.fix_pathinfo = 0”;4、重启php-fpm即可。

跨域是开发中经常会遇到的一个场景,也是面试中经常会讨论的一个问题。掌握常见的跨域解决方案及其背后的原理,不仅可以提高我们的开发效率,还能在面试中表现的更加

nginx部署react刷新404的解决办法:1、修改Nginx配置为“server {listen 80;server_name https://www.xxx.com;location / {root xxx;index index.html index.htm;...}”;2、刷新路由,按当前路径去nginx加载页面即可。

linux版本:64位centos6.4nginx版本:nginx1.8.0php版本:php5.5.28&php5.4.44注意假如php5.5是主版本已经安装在/usr/local/php目录下,那么再安装其他版本的php再指定不同安装目录即可。安装php#wgethttp://cn2.php.net/get/php-5.4.44.tar.gz/from/this/mirror#tarzxvfphp-5.4.44.tar.gz#cdphp-5.4.44#./configure--pr

nginx禁止访问php的方法:1、配置nginx,禁止解析指定目录下的指定程序;2、将“location ~^/images/.*\.(php|php5|sh|pl|py)${deny all...}”语句放置在server标签内即可。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Dreamweaver Mac version
Visual web development tools

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SublimeText3 Chinese version
Chinese version, very easy to use

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
