Nginx log_format性能参数$request_time $upstream_response_time

log_format是指存储日志的时候所采用的格式，可以在/etc/nginx//nginx.conf的http字段中设置

默认配置如下：

  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  /var/log/nginx/access.log  main;

在分析性能过程，有时需要分析请求耗时，可以添加$request_time $upstream_response_time两个参数实现：

  log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for $request_time $upstream_response_time $upstream_addr $upstream_status"';

    access_log  /var/log/nginx/access.log  main;

完整案例：

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    map $http_upgrade $connection_upgrade {
        default upgrade;
        '' close;
    }

    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" $upstream_addr  '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for $request_time $upstream_response_time $upstream_addr $upstream_status"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;
    server_tokens off;
    add_header X-Frame-Options SAMEORIGIN;
    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;
}

具体参数解释如下：