tomcat + nginx 配置负载均衡实验过程

多种tomcat负载均衡的案例，最终选择nginx+tomcat，因为nginx比较轻量级，容易配置。
过程：
1、 进入nginx官网，下载最新版1.13.7（1.12测试了一下好像有问题）

2、 进入tomcat官网，下载tomcat，版本为8.5.24

3、 将所有文件放入同一个目录下，并解压改名

4、 分别进入两个tomcat文件目录，改动conf/server.xml中的3处端口号，启动端口号，我一个设置为8090，一个设置为8091

5、 进入nginx文件夹，改动nginx.conf为以下代码：

user  administrator;worker_processes  4;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{                  server 127.0.0.1:8090 weight=1;              server 127.0.0.1:8091 weight=1;    }        server {        listen       80;        server_name  localhost;        charset utf-8;        #access_log  logs/host.access.log  main;        location / {            root   html;            index  index.html index.htm;            proxy_pass  http://localhost;        }        #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;    #    }    #}}

6、 如果有的话，将电脑中原有的tomcat环境变量配置删除，不删除我这边会有问题

7、 改动两个tomcat中的webapps/ROOT/index.jsp用于分别两个tomcat

8、 先启动两个tomcat再启动nginx

9、 进入浏览器，输入localhost，看到的为tomcat页面，因配置的nginx将两个服务器的权重都设置为1，所以基本每次刷新浏览器都会改变服务器，实验成功