windows下通过nginx实现tomcat集群负载均衡（入门）

一、目标

Windows下，下载安装nginx
Nginx常用命令
Nginx负载均衡两个tomcat
Nginx配置多个负载均衡服务

二、下载安装nginx

下载地址http://nginx.org/en/download.html

版本nginx-1.14.1

无需安装，解压后直接使用即可。

启动后，浏览器输入localhost, 验证nginx是否安装启动成功。

三、Nginx常用命令

1、启动（命令行）：start nginx

2、关闭（命令行）：nginx –s stop

3、重新加载配置：nginx –s reload

4、测试配置是否正确：nginx –t

5、注意

有时执行了关闭命令，nginx进程任然存在，需要在任务管理器中将nginx进程杀掉。否则会导致nginx的最新配置无法生效。

四、Nginx负载均衡两个tomcat

修改nginx-1.14.1\conf的nginx.conf

在#gzip on;下方添加：

upstream www.hcbtest.com{

server 127.0.0.1:8080 weight=2;

server 127.0.0.1:9090 weight=3;

}

修改location /，修改为：

location / {

root html;

index index.html index.htm;

proxy_pass http://www.hcbtest.com;

proxy_redirect default;

}

修改server端口:

listen 10080;

server_name localhost;

Tomcat调整：

保证tomcat的自带工程root是存在的；把两个tomcat的index.jsp内容进行修改，修改成不同的页面显示效果，用以体现负载均衡效果。

浏览器输入localhost:10080，多次刷新浏览器，可见有时呈现的是tomcat1的index.jsp页面，有时呈现的是tomcat2的index.jsp的页面。

五、Nginx配置多个负载均衡服务

只需基于上述的配置，继续添加如下配置即可：

1、

upstream www.hcbtest2.com{

server 127.0.0.1:8080 weight=3;

server 127.0.0.1:9090 weight=2;

}

2、 server {

listen 10081;

server_name localhost;

#charset koi8-r;

#access_log logs/host.access.log main;

location / {

root root;

index index.html index.htm index.jsp;

proxy_pass http://www.hcbtest2.com/examples/;

proxy_redirect default;

}

3、保证tomcat自带的examples工程是存在的；

4、把两个tomcat的examples工程index.jsp内容进行修改，修改成不同的页面显示效果，用以体现负载均衡效果。

5、浏览器输入localhost:10081，多次刷新浏览器即可呈现不同的界面。

六、nginx完整配置文件


#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;
	upstream www.hcbtest.com{
	       server 127.0.0.1:8080 weight=2;#默认为权重，访问7088和9080 端口的比例为1：1
	       server 127.0.0.1:9090 weight=3;
	}

	upstream www.hcbtest2.com{
	       server 127.0.0.1:8080 weight=3;#默认为权重，访问7088和9080 端口的比例为1：1
	       server 127.0.0.1:9090 weight=2;
	}
	
    server {
        listen       10080;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
            
            proxy_pass http://www.hcbtest.com;  
            proxy_redirect default;  
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }

	server {
        listen       10081;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   root;
            index  index.html index.htm index.jsp;
            
            proxy_pass http://www.hcbtest2.com/examples/;  
            proxy_redirect default;  
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }
    
    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}