ngnix+tomcat简单的负载均衡

参考博客：http://blog.csdn.net/lsp1357/article/details/25806127

在window下：

1.下载ngnix

http://nginx.org/en/download.html （最好下载稳定版）

2.解压，启动nginx.exe

3.配置nginx.conf

#user  nobody;
worker_processes  2;
#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 localhost{
#根据ip计算将请求分配给哪个后端tomcat，许多人误认为可以解决session问题，其实并不能
#同一机器在多网情况下，路由切换，ip可能不同
#ip_hash
server 127.0.0.1:18081;
server 127.0.0.1:18080;
}
server {
listen       80;
server_name  127.0.0.1;
#charset koi8-r;
#access_log  logs/host.access.log  main;
location / {
proxy_pass http://localhost; root   html;
index  index.html index.htm;
}
location ~ \.jsp$ {
proxy_pass  http://localhost;#这里的localhost要跟upstream后面跟的一样 }
#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;
#    }
#}
}

4.ngnix -s reload

5.复制一份tomcat，命名为apache-tomcat-1、apache-tomcat-2，删除日志

修改它们的server.xml中的文件

<Server port="18006" shutdown="SHUTDOWN">
<Connector port="18081" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="18443" />
<Connector port="8009" protocol="AJP/1.3" redirectPort="18443" />
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">

<Server port="18007" shutdown="SHUTDOWN">
<Connector port="18080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
<Connector port="8010" protocol="AJP/1.3" redirectPort="8443" />
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">

修改一下webapps中的ROOT的index.jsp，随便加点东西即可，使访问apache-tomcat-1和apache-tomcat-2的index.jsp有区别就行，启动它们

访问http://localhost





会在1、2之间来回切换