Nginx作为负载均衡服务器——server参数讲解

upstream举例

 upstream backend {

        server backend1.ecample.com       weight = 5;  # wwight 代表权重
        server backend2.ecample.com:8080;
        server unix:/tmp/backend3;

        server backend1.com       backup;        # backup 代表备份
        server backend2.com:8080;  backup;          

}

后端服务器在负载均衡调度中的状态

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演示：

配置.conf文件

upstream test {
        server 192.168.96.188:8001   down;
        server 192.168.96.188:8002;   backup;     # 预留的备份服务器
        server 192.168.96.188:8003;   max_fails=1 fail_timeout=10s;  # 经过max_fails失败后，服务暂停的时间

	}

server {
    listen       80;
    server_name  localhost www.test.com;

    #charset koi8-r;
    #access_log  /usr/local/nginx/logs/test_proxy.access.log  main;
    resolver  8.8.8.8;

    location / {
        proxy_pass http://test;
        include proxy_params;
    }

    #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   /usr/share/nginx/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;
    #}
}

访问目标主机192.168.96.146。刷新之后，只能访问到server3

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将192.168.96.188的这台主机server3这个服务停掉。然后再访问192.168.96.146。这时候只能访问到备份的server2

​

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