CentOS7+Nginx配置Tomcat負載均衡環境

1.准備兩個Tomcat

配置兩個Tomcat一個端口是8080另外一個端口是8081，分別在webapps下面添加一個測試用的web項目，修改index.jsp文件，8080端口的index.jsp頁面加入：

This page is from 8080 port

8081的端口的index.jsp加入：

This page is from 8081 port

之后啟動兩個Tomcat，8080端口跟8081端口都要開放

開放端口：
firewall-cmd --zone=public --add-port=8080/tcp --permanent

查看開放的端口:
firewall-cmd --list-ports

　　

2.配置Nginx

使用whereis nginx命令找到nginx所在的目錄並進入目錄內的conf文件夾找到ngnix.conf配置文件，在conf文件夾下創建一個vhosts文件夾並在里面創建一個webapp.conf文件內容如下：

upstream www.test.com {  #這里的名稱要跟proxy_pass內的名稱一致 
 
	server 127.0.0.1:8080 weight=1; #weight:權重，默認是1，數值越大提供服務的次數就越多 
 
	server 127.0.0.1:8081 weight=1; 
        
        server 127.0.0.1:8083 down; #down表示當前的服務暫不參於負載
        
        server 127.0.0.1:8084 backup; #backup 其它所有非backup機器down或者忙時，才會請求backup機器。
}  
  
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; #這里的http://www.test.com與上面的upstream要一樣
  
		#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;  
	}  
}  

接着將創建的vhosts/webapps.conf文件include到nginx.conf文件內。

#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;#這里把webapp.conf文件include進來

    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;
        #}
    }

重新加載Nginx:

./nginx -s reload

在地址欄輸入地址看下效果：

把8080端口的Tomcat關閉后再訪問：

3.隨機啟動

通過vi /lib/systemd/system/nginx.service來添加nginx.service文件，並輸入如下內容：

[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：如果不是安裝在/usr/local/nginx/目錄下，請根據實際安裝路徑修改ExecStart、ExecReload、ExecStop中的值。

更改nginx.service為可執行：

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

設置開機自啟動

systemctl enable nginx.service