使用Nginx+Tomcat8搭建负载均衡服务器

Nginx

nginx是当下运用最广泛的开源的反向代理服务器。
反向代理：即把外部来的请求，转发给被代理的服务器，再将返回的结果通过nginx返回给客户端。下面搭建搭建一个负载均衡服务器。

安装Nginx

相关软件
nginx-1.12.0.tar.gz
apache-tomcat-8.5.15.tar.gz

安装Nginx相关依赖

nginx需要依赖一些环境
安装gcc

yum install gcc-c++ 

安装PCRE

yum install -y pcre pcre-devel

安装zlib

yum install -y zlib zlib-devel

安装openssl

yum install -y openssl openssl-devel

tar -zxvf -R nginx-1.12.0.tar.gz /usr/local/

解压后的到nginx-1.12.0目录，

cd nginx-1.12.0

可以定义nginx的链接文件，例如指定nginx.conf的路径
./configure
–prefix=/usr/local/nginx-1.12.0
–with-http_stub_status_module
–with-http_ssl_module
–with-http_realip_module

编译

make & make install

测试nginx安装

./sbin/nginx -t

如下便安装好了

安装Tomcat，

前提安装好了JDK，并配置好了环境变量。
将Tomcat 解压至/user/local/Tomcat
将我们的测试项目war包，拷贝至webapp目录下，容器启动后会自动解压项目

修改server.xml由于这里我们要在同一台机器上运行2个tomcat实例，所以要更改一个tomcat实例的相关端口，避免和另一个冲突。
我这里在原端口的基础上+1，前提保证端口没被占用。

启动2个tomcat实例。

./bin/startup.sh

配置nginx.conf

#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;
   # include hosts/tomcat_test.conf;    
    upstream nginx_test{
    server 127.0.0.1:8080 weight=1;
    server 127.0.0.1:8081 weight=1;
   }     
    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
           # root   html;
           # index  index.html index.htm;
       proxy_pass http://nginx_test;
        }

        #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;
    #    }
    #}

}

相关配置详情
https://www.nginx.com/resources/wiki/start/topics/examples/full/

这里我们配置一个nginx_test的一个代理，配置2个tomcat映射路径。

测试结果