本篇博文：请参考这里。
还有一篇：Nginx 实现域名解析时通过80端口访问多个端口（架设多个网站）！
实现高性能负载均衡的Tomcat集群：
工具：nginx-1.13.9和多个apache-tomcat-9.0.0.M9（解压版），nginx下载地址。
一、多个tomcat的配置
先看安装版的界面：
从这可以看出需要免安装版的tomcat里面需要设置的主要是server shutdown port（8005） 和 http/1.1 Connector Port （8080）和AJP/1.3 Connector Port（8009）等三个参数及windows Service Name tomcat服务器名称（对应免安装版的D:\nginx\tomcat\apache-tomcat-9.0.0.M91目录里的名字apache-tomcat-9.0.0.M91），主要是这四个参数。上面截图参数是默认参数。
故看看下面免安装版的注意点：
解压多个tomcat名字命名不一样。tomcat里面的设置点：
-
修改Tomcat的conf目录下的server.xml，修改这多个Tomcat的启动端口，分别为18080和28080等。
需要修改的是下面三处：蓝色的端口号（关闭，启动，？）
<Server port="28005" shutdown="SHUTDOWN"> <Connector port="28080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" /> <Connector port="28009" protocol="AJP/1.3" redirectPort="8443" /> </Server>
-
在startup.bat里面开头部分设置JAVA_HOME和CATALINA_HOME。
SET JAVA_HOME=D:\software\jdk1.8 SET CATALINA_HOME=D:\nginx\tomcat\apache-tomcat-9.0.0.M91 @echo off然后启动并访问tomcat首页，看是不是能正常启动。
三个tomcat启动后截图：
这样三个tomcat能正常启动了。
注意点：tomcat启动报错：（1）端口号问题；（2）配置环境问题。
The JRE_HOME environment variable is not defined correctly（报错了） 原因：Set JAVA_HOME or JRE_HOME if not already set and ensure any provided（设置了多个JAVA_HOME）
二、Nginx的简单配置
nginxconf的原始代码：
#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;
server {
listen 80;
server_name localhost;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
root html;
index index.html index.htm;
}
#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$fastcgi_script_name;
# include fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
}
# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias;
# location / {
# root html;
# index index.html index.htm;
# }
#}
# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost;
# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m;
# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;
# location / {
# root html;
# index index.html index.htm;
# }
#}
}
修改后的代码：
#user nobody;
worker_processes 1;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
#log_format main '$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 netitcast.com{
server 127.0.0.1:18080 weight=1;
server 127.0.0.1:28080 weight=1;
server 127.0.0.1:38080 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;
# }
location /{
proxy_pass http://netitcast.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;
#}
}
# 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;
# }
#}
}
核心配置：
稍微详细的配置：
worker_processes 1;#工作进程的个数，一般与计算机的cpu核数一致
events {
worker_connections 1024;#单个进程最大连接数（最大连接数=连接数*进程数）
}
http {
include mime.types; #文件扩展名与文件类型映射表
default_type application/octet-stream;#默认文件类型
sendfile on;#开启高效文件传输模式，sendfile指令指定nginx是否调用sendfile函数来输出文件，对于普通应用设为 on，如果用来进行下载等应用磁盘IO重负载应用，可设置为off，以平衡磁盘与网络I/O处理速度，降低系统的负载。注意：如果图片显示不正常把这个改成off。
keepalive_timeout 65; #长连接超时时间，单位是秒
gzip on;#启用Gizp压缩
#服务器的集群
upstream netitcast.com { #服务器集群名字
server 127.0.0.1:18080 weight=1;#服务器配置 weight是权重的意思，权重越大，分配的概率越大。
server 127.0.0.1:28080 weight=2;
}
#当前的Nginx的配置
server {
listen 80;#监听80端口，可以改成其他端口
server_name localhost; # 当前服务的域名
location / {
proxy_pass http://netitcast.com;
proxy_redirect default;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}
三、Nginx的启动、关闭、重启
命令：(通过cmd以守护进程方式启动nginx.exe：start nginx，停止服务：nginx-s stop 或nginx -s quit，重新加载配置：nginx -s reload；)。
注意点：（1.nginx.conf文件里的 pid logs/nginx.pid;要打开，不可注释掉（#pid logs/nginx.pid;），注释掉可能会导致重启或关闭失败。
如果nginx不是安装在c盘的话，在启动命令时一定要先cd到具体的磁盘的文件夹 命令：cd /d D:\nginx\nginx-1.13.9）
