Nginx：如何设置’limit_conn’和’limit_req’？

我在ubuntu 14.04上使用nginx版本1.6.2

我试图在配置文件中输入limit_conn和limit_req,引用nginx documentation.

Nginx在没有limit_conn和limit_req选项的情况下运行良好.

以下是带有日志消息的nginx配置的测试用例.

我不知道我的代码有什么问题.

案例1 – 完整配置

/etc/nginx/nginx.conf

http {
    ...
    include /etc/nginx/sites-enabled/*;
    ...
    limit_conn_zone $binary_remote_addr zone=conn_limit_per_ip:10m;
    limit_req_zone $binary_remote_addr zone=req_limit_per_ip:10m rate=5r/s;
    ...
}

/etc/nginx/sites-enabled/service.conf

server {
    ...
    location / {
        limit_conn conn_limit_per_ip 30;
        limit_req zone=req_limit_per_ip burst=5 nodelay;
        ...
    }        
    ...
}

日志消息

unknown limit_req_zone "req_limit_per_ip" in /etc/nginx/sites-enabled/service.conf

情况2 – 从启用站点的配置文件中删除limit_req

/etc/nginx/nginx.conf

http {
    ...
    include /etc/nginx/sites-enabled/*;
    ...
    limit_conn_zone $binary_remote_addr zone=conn_limit_per_ip:10m;
    limit_req_zone $binary_remote_addr zone=req_limit_per_ip:10m rate=5r/s;
    ...
}

/etc/nginx/sites-enabled/service.conf

server {
    ...
    location / {
        limit_conn conn_limit_per_ip 30;
        ...
    }        
    ...
}

日志消息

the size 10485760 of shared memory zone "conn_limit_per_ip" conflicts with already declared size 0 in /etc/nginx/nginx.conf

案例3 – 从启用站点的配置文件中删除limit_conn

/etc/nginx/nginx.conf

http {
    ...
    include /etc/nginx/sites-enabled/*;
    ...
    limit_conn_zone $binary_remote_addr zone=conn_limit_per_ip:10m;
    limit_req_zone $binary_remote_addr zone=req_limit_per_ip:10m rate=5r/s;
    ...
}

/etc/nginx/sites-enabled/service.conf

server {
    ...
    location / {
        limit_req zone=req_limit_per_ip burst=5 nodelay;
        ...
    }        
    ...
}

日志消息

unknown limit_req_zone "req_limit_per_ip" in /etc/nginx/sites-enabled/service.conf

案例4 – 从启用站点的配置文件中删除所有内容

/etc/nginx/nginx.conf

http {
    ...
    include /etc/nginx/sites-enabled/*;
    ...
    limit_conn_zone $binary_remote_addr zone=conn_limit_per_ip:10m;
    limit_req_zone $binary_remote_addr zone=req_limit_per_ip:10m rate=5r/s;
    ...
}

/etc/nginx/sites-enabled/service.conf

server {
    ...
    location / {
        ...
    }        
    ...
}

日志消息

[OK] - nginx reloaded well

情况5 – 删除limit_req_zone和limit_req

/etc/nginx/nginx.conf

http {
    ...
    include /etc/nginx/sites-enabled/*;
    ...
    limit_conn_zone $binary_remote_addr zone=conn_limit_per_ip:10m;
    ...
}

/etc/nginx/sites-enabled/service.conf

server {
    ...
    location / {
        limit_conn conn_limit_per_ip 30;
        ...
    }        
    ...
}

日志消息

the size 10485760 of shared memory zone "conn_limit_per_ip" conflicts with already declared size 0 in /etc/nginx/nginx.conf

案例6 – 删除limit_conn_zone和limit_conn

/etc/nginx/nginx.conf

http {
    ...
    include /etc/nginx/sites-enabled/*;
    ...
    limit_req_zone $binary_remote_addr zone=req_limit_per_ip:10m rate=5r/s;
    ...
}

/etc/nginx/sites-enabled/service.conf

server {
    ...
    location / {
        limit_req zone=req_limit_per_ip burst=5 nodelay;
        ...
    }        
    ...
}

日志消息

unknown limit_req_zone "req_limit_per_ip" in /etc/nginx/sites-enabled/service.conf