Nginx ("engine x") is a high-performance HTTP and reverse proxy server, as well as an IMAP/POP3/SMTP server. As a reverse proxy server, Nginx can accelerate web servers and has load balancing functions. nginx can automatically eliminate servers that have stopped serving to ensure normal access to web services.
In this example, a user accesses 192.168.1.4 and proxies it to the two servers 192.168.1.2:80 and 192.168.1.3:80 to implement the load.
The following is the configuration file nginx.conf:
user www www; worker_processes 10; #error_log logs/error.log; #error_log logs/error.log notice; #error_log logs/error.log info; #pid logs/nginx.pid; #最大文件描述符 worker_rlimit_nofile 51200; events { worker_connections 51200; } http { include conf/mime.types; default_type application/octet-stream; keepalive_timeout 120; tcp_nodelay on; #nginx的upstream默认是以轮询的方式实现负载均衡,这种方式中,每个请求按时间顺序逐一分配到不同的后端服务器, #如果后端服务器down掉,能自动剔除。另外一种方式是ip_hash:每个请求按访问ip的hash结果分配, #这样每个访客固定访问一个后端服务器,可以解决session的问题。 upstream webserver { server 192.168.1.2:80 weight=1; server 192.168.1.3:80 weight=1; } server{ listen 80; server_name localhost; location / { #设置反向代理的地址 proxy_pass http://webserver; #设置主机头和客户端真实地址,以便服务器获取客户端真实IP proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } log_format localhost '$remote_addr - $remote_user [$time_local] $request ' '"$status" $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; access_log /data1/logs/www.log localhost ; } }
The above is the relevant tutorial on Nginx reverse proxy and load balancing practice. I hope it can help everyone.
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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

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