负载均衡后端状态

状态	概述
down	当前的server暂时不参与负载均衡
backup	预留的备份服务器
max_fails	允许请求失败的次数
fail_timeout	经过max_fails失败后, 服务暂停时间
max_conns	限制最大的接收连接数

1.down状态配置测试

[root@lb01 ~]# vim /etc/nginx/conf.d/zh.conf
upstream zh {
    server 172.16.1.7:80 down;
    server 172.16.1.8:80;
}
server {
    listen 80;
    server_name linux.zh.com;

    location / {
        proxy_pass http://zh;
        include /etc/nginx/proxy_params;
    }
}

2.backup状态测试

[root@lb01 ~]# vim /etc/nginx/conf.d/zh.conf
upstream zh {
    server 172.16.1.7:80;
    server 172.16.1.8:80;
    server 172.16.1.10:80 backup;
    server 172.16.1.11:80 backup;

}
server {
    listen 80;
    server_name linux.zh.com;

    location / {
        proxy_pass http://zh;
        include /etc/nginx/proxy_params;

    }

}

3.max_fails配置

[root@lb01 ~]# vim /etc/nginx/conf.d/zh.conf
upstream zh {
    server 172.16.1.7:80 max_fails=3 fail_timeout=10s;
    server 172.16.1.8:80;

}
server {
    listen 80;
    server_name linux.zh.com;

    location / {
        proxy_pass http://zh;
        include /etc/nginx/proxy_params;

    }

}

4.测试max_conns最大TCP连接数

[root@lb01 ~]# vim /etc/nginx/conf.d/zh.conf
upstream zh {
    server 172.16.1.7:80 max_conns=10;
    server 172.16.1.8:80;

}
server {
    listen 80;
    server_name linux.zh.com;

    location / {
        proxy_pass http://zh;
        include /etc/nginx/proxy_params;

    }

}