Nginx upstream keepalive上连接

Posted On 2019年6月4日     By  liang

Nginx 对上游服务器使用keepalive长连接。

功能：通过服用连接，降低nginx与上游服务器建立，关闭连接的消耗，提升吞吐量的同时降低时延。

默认已经编译进nginx , 通过–without-http_upstream_keepalive_module 移除。

对上游http头部设定:

#为了防止客户端请求的是HTTP1.0协议，指定上游连接时http1.1
proxy_http_version 1.1;
#修改客户端header头中connection值为close 
proxy_set_header Connection ""; 

upstream_keepalive指令：

#最多保持多少个空闲连接
Syntax: keepalive connections;
Default: ---
Context: upstream

#一条tcp连接上最多支持多少个请求
Syntax: keepalive_requests number;
Default: keepalive_requests 100;
Context: upstream

#一条tcp连接超时时间
Syntax: keepalive_timeout timeout;
Default: keepalive_timeout 60s;
Context: upstream 

指定上游服务域名解析的resolver指令

Syntax: resolver address ... [valid=time] [ipv6=on|off]
Default: ---
Context: http,server,location

Syntax: resolver_timeout time;
Default: resolver_timeout 30s;
Context: http,server,location 

配置示例

upstream up_servers {
    server 127.0.0.1:8011 weight=2 max_conns=2 max_fails=2 fail_timeout=5;
    server 127.0.0.1:8012;
    keepalive 100;
}

server {
    server_name localhost;
    error_log logs/errors.log info;

    location / {
        proxy_pass http://up_servers;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
    }
}