1.准备两个Tomcat

配置两个Tomcat一个端口是8080另外一个端口是8081，分别在webapps下面添加一个测试用的web项目，修改index.jsp文件，8080端口的index.jsp页面加入：

This page is from 8080 port

8081的端口的index.jsp加入：

This page is from 8081 port

之后启动两个Tomcat，8080端口跟8081端口都要开放

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开放端口：
firewall-cmd --zone=public --add-port=8080/tcp --permanent
 
查看开放的端口:
firewall-cmd --list-ports

　　

2.配置Nginx

使用whereis nginx命令找到nginx所在的目录并进入目录内的conf文件夹找到ngnix.conf配置文件，在conf文件夹下创建一个vhosts文件夹并在里面创建一个webapp.conf文件内容如下：

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upstream www.test.com {  #这里的名称要跟proxy_pass内的名称一致 <br>
    server 127.0.0.1:8080 weight=1; #weight:权重，默认是1，数值越大提供服务的次数就越多 <br>
    server 127.0.0.1:8081 weight=1; <br>       
        server 127.0.0.1:8083 down; #down表示当前的服务暂不参于负载<br>       
        server 127.0.0.1:8084 backup; #backup 其它所有非backup机器down或者忙时，才会请求backup机器。
} 
   
server { 
    listen 80; 
    server_name www.test.com; 
    access_log logs/bbs.access.log; 
    error_log logs/bbs.error.log; 
    #root html; 
    #index index.html index.htm index.jsp index.php; 
   
    location / { 
        proxy_pass http://www.test.com; #这里的http://www.test.com与上面的upstream要一样
   
        #Proxy Settings 
        proxy_redirect off; 
        proxy_set_header Host $host; 
        proxy_set_header X-Real-IP $remote_addr; 
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
        proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504; 
        proxy_max_temp_file_size 0; 
        proxy_connect_timeout 90; 
        proxy_send_timeout 90; 
        proxy_read_timeout 90; 
        proxy_buffer_size 4k; 
        proxy_buffers 4 32k; 
        proxy_busy_buffers_size 64k; 
        proxy_temp_file_write_size 64k; 
    } 
}

接着将创建的vhosts/webapps.conf文件include到nginx.conf文件内。

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#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 vhosts/webapp.conf;#这里把webapp.conf文件include进来
 
    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;
        #}
    }

重新加载Nginx:

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./nginx -s reload

在地址栏输入地址看下效果：

把8080端口的Tomcat关闭后再访问：

3.随机启动

通过vi /lib/systemd/system/nginx.service来添加nginx.service文件，并输入如下内容：

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[Unit] 
Description=nginx 1.13.7 
After=network.target 
   
[Service] 
Type=forking 
ExecStart=/usr/local/nginx/sbin/nginx 
ExecReload=/usr/local/nginx/sbin/nginx -s reload 
ExecStop=/usr/local/nginx/sbin/nginx -s quit 
PrivateTmp=true 
   
[Install] 
WantedBy=multi-user.target 

注意：如果不是安装在/usr/local/nginx/目录下，请根据实际安装路径修改ExecStart、ExecReload、ExecStop中的值。

更改nginx.service为可执行：

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chmod 755 /lib/systemd/system/nginx.service 

设置开机自启动

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systemctl enable nginx.service