在http的功能里添加log_format模块，内容如下：

log_format main escape=json '{ "@timestamp": "$time_iso8601", '

'"remote_addr": "$remote_addr",'
'"request_time": "$request_time",'
'"upstream_response_time": "$upstream_response_time",'
'"status": $status,'
'"x_forwarded": "$http_x_forwarded_for",'
'"http_referer": "$http_referer",'
'"request": "$request",'
'"upstream_addr": "$upstream_addr",'
'"body_bytes_sent":$body_bytes_sent,'
'"request_body":$request_body,'
'"http_user_agent": "$http_user_agent" }';

access_log /usr/local/openresty/nginx/logs/access.log main;

########################################以下是一个完整的nginx.conf文件的配置与说明#########################

user nginx nginx; #启动用户
worker_processes 4; #nginx的进程数，建议和cpu核数一致

#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#error_log logs/error.log warn; #全局LOG定义

pid logs/nginx.pid; # 进程文件ID

worker_rlimit_nofile 65535; #nginx进程打开的文件数
#工作模式与连接数配置
events {
use epoll; # epoll是高版本内核优化后的网络I/O模型
worker_connections 65535; #单个进程最大连接数
multi_accept on; #打开快速接收新连接
}

#http服务设置
http {
include mime.types;#文件扩展名与类型映射表
default_type application/octet-stream;#默认文件类型

charset utf-8;#默认编码
server_names_hash_bucket_size 128; #服务器名字的hash表大小
client_header_buffer_size 32k; #上传文件大小限制
large_client_header_buffers 4 32k; #设定请求缓存数
client_max_body_size 32m; #设定请求缓存大小
#include proxy.conf;

#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 logs/access.log main;
#resolver 8.8.8.8;
sendfile on; #开启高效文件传输
tcp_nopush on; #防止网络阻塞
tcp_nodelay on;

#keepalive_timeout 0;
keepalive_timeout 30; #长连接超时时间，默认单位秒

####解决跨域问题###########
add_header Access-Control-Allow-Origin *;
add_header Access-Control-Allow-Headers X-Requested-With,Content-Type,If-Modified-Since;
add_header Access-Control-Allow-Methods GET,POST,OPTIONS;

#以下是FastCGI 的相关参数，主要作用减少资源占用优化网站性能提高访问速度
fastcgi_connect_timeout 300;
fastcgi_send_timeout 300;
fastcgi_read_timeout 300;
fastcgi_buffer_size 64k;
fastcgi_buffers 4 64k;
fastcgi_busy_buffers_size 128k;
fastcgi_temp_file_write_size 64k;
set_real_ip_from 0.0.0.0/0;
real_ip_header X-Forwarded-For;
open_file_cache max=10240 inactive=20s;
open_file_cache_min_uses 1;
open_file_cache_valid 30s;

#gizp优化配置，加速传速
gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_http_version 1.0;
gzip_comp_level 2;
gzip_types text/plain application/x-javascript text/css application/xml;
gzip_vary on;
gzip_disable msie6;

proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
proxy_max_temp_file_size 0;
proxy_connect_timeout 90;
proxy_send_timeout 90;
proxy_read_timeout 90;
proxy_buffer_size 4k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;

log_format main escape=json '{ "@timestamp": "$time_iso8601", '
'"remote_addr": "$remote_addr",'
'"request_time": "$request_time",'
'"upstream_response_time": "$upstream_response_time",'
'"status": $status,'
'"x_forwarded": "$http_x_forwarded_for",'
'"http_referer": "$http_referer",'
'"request": "$request",'
'"upstream_addr": "$upstream_addr",'
'"body_bytes_sent":$body_bytes_sent,'
'"request_body":$request_body,'
'"http_user_agent": "$http_user_agent" }';
access_log /usr/local/openresty/nginx/logs/access.log main;
error_log /usr/local/openresty/nginx/logs/error.log;
# 虚拟主机配置我这定义到了/usr/local/openresty/nginx/conf/vhosts目录下
include vhosts/*.conf;

}