tomcat+nginx简单实现负载均衡

1.环境准备

在前面的博客中我已经安装好nginx和一台tomcat了。现在就在加一台tomcat

tomcat1:  /apps/tomcat/tomcat1/apache-tomcat-7.0.69/

tomcat2: /apps/tomcat/tomcat2/apache-tomcat-7.0.69/

jdk:java7

nginx:nginx-1.4.2

给tomcat添加权限

chmod +775 -R /apps/tomcat/tomcat1

chmod +775 -R /apps/tomcat/tomcat2

tomcat下载地址： http://pan.baidu.com/s/1gf7gcVL

2.修改 server.xml 给tomcat配置不同的端口

cd /apps/tomcat/tomcat1/apache-tomcat-7.0.69/conf/

vi server.xml

tomcat1  8080

tomcat2 8081

3.给tomcat编写不同的测试页，用来测试nginx是否能分发请求

vi /apps/tomcat/tomcat1/apache-tomcat-7.0.69/webapps/ROOT/index.jsp

vi /apps/tomcat/tomcat2/apache-tomcat-7.0.69/webapps/ROOT/index.jsp

4.配置nginx

进入安装目录

cd /apps/install/nginx/conf/

编辑配置文件

vi /apps/install/nginx/conf/nginx.conf

添加如下部分

upstream的负载均衡，weight是权重，可以根据机器配置定义权重。weigth参数表示权值，权值越高被分配到的几率越大。

user  root;
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 tomcat_server{
                server localhost:8080 weight=1;
                server localhost: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://tomcat_server;
        }

       # error_page  403              /html/index.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;
    #    }
    #}

}

　　

5.启动测试

tomcat1

tomcat2

启动nginx

/apps/install/nginx/sbin/nginx

访问nginx

再次访问

ok 成功路由到了2台tomcat

6.nginx 常用命令

cd /apps/install/nginx/

启动

./sbin/nginx

停止

./sbin/nginx -s stop

重载配置

./sbin/nginx -s reload

指定配置文件启动

./sbin/nginx -c /usr/local/nginx/conf/nginx.conf

查看 Nginx 版本

./sbin/nginx -v

检查配置文件是否正确

./sbin/nginx -t

显示帮助信息

./sbin/nginx -h