第二部分:分别安装Nginx负载均衡器及相关配置脚本
先安装Nginx负载均衡器,nginx负载的配置就用一般的模板来配置了
- #添加运行nginx的用户和组www
- groupadd www
- useradd -g www www
- wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-7.8.tar.gz
- tar zxvf pcre-7.8.tar.gz
- cd pcre-7.8/
- ./configure
- make && make install
- wget http://sysoev.ru/nginx/nginx-0.7.51.tar.gz
- tar zxvf nginx-0.7.51.tar.gz
- cd nginx-0.7.51/
- ./configure --user=www --group=www --prefix=/usr/local/webserver/nginx --with-http_stub_status_module --with-http_ssl_module
- make && make install
配置nginx负载均衡器的配置文件vim /usr/local/nginx/conf/nginx.conf,此篇文章仅仅只是我的某项目的配置文档,纯80转发;如果对nginx配置有https要求的可参考张宴的相关文章。
- user www www;
- worker_processes 8;
- pid /usr/local/nginx/logs/nginx.pid;
- worker_rlimit_nofile 65535;
- events
- {
- use epoll;
- worker_connections 65535;
- }
- http{
- include mime.types;
- default_type application/octet-stream;
- server_names_hash_bucket_size 128;
- client_header_buffer_size 32k;
- large_client_header_buffers 4 32k;
- client_max_body_size 8m;
- sendfile on;
- tcp_nopush on;
- keepalive_timeout 60;
- tcp_nodelay on;
- fastcgi_connect_timeout 300;
- fastcgi_send_timeout 300;
- fastcgi_read_timeout 300;
- fastcgi_buffer_size 64k;
- fastcgi_buffers 4 64k;
- fastcgi_busy_buffers_size 128k;
- fastcgi_temp_file_write_size 128k;
- gzip on;
- gzip_min_length 1k;
- gzip_buffers 4 16k;
- gzip_http_version 1.0;
- gzip_comp_level 2;
- gzip_types text/plain application/x-javascript text/css application/xml;
- gzip_vary on;
- upstream backend
- {
- server 192.168.1.102:80;
- server 192.168.1.103:80;
- server 192.168.1.105:80;
- }
- server {
- listen 80;
- server_name www.yuhongchun027.com;
- location / {
- root /var/www ;
- index index.jsp index.htm index.html;
- proxy_redirect off;
- proxy_set_header Host $host;
- proxy_set_header X-Real-IP $remote_addr;
- proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
- proxy_pass http://backend;
- }
- location /nginx {
- access_log on;
- auth_basic "NginxStatus";
- auth_basic_user_file /usr/local/nginx/htpasswd;
- }
- log_format access '$remote_addr - $remote_user [$time_local] "$request" '
- '$status $body_bytes_sent "$http_referer" '
- '"$http_user_agent" $http_x_forwarded_for';
- access_log /var/log/access.log access;
- }
- }
小节:
第一部分和第二部分讲的是如何通过安装Nginx来达到负载均衡后端web集群的过程,Nginx能实现自动切换后端有故障的web服务器;但Nginx负载均衡器出了问题怎么办呢,它们之间是如何实现无故障转移的呢?