说明：

nginx日志主要有两种：访问日志、错误日志。其中访问日志记录客户端访问nginx的每一个请求，包含用户地域来源、跳转来源、使用终端、某个URL访问量等信息，访问日志格式可以自定义；错误日志则记录客户端访问nginx出错时的日志，格式不支持自定义，通过错误日志，你可以得到系统某个服务或server的性能瓶颈等。两种日志都可以选择性关闭。

访问日志[Access.log]

log_format main ‘$remote_addr $remote_user [$time_local] “$request” $http_host ‘
‘$status $upstream_status $body_bytes_sent “$http_referer” ‘
‘”$http_user_agent” $ssl_protocol $ssl_cipher $upstream_addr ‘
‘$request_time $upstream_response_time';

变量名称

变量描述

举例说明

$remote_addr

客户端地址

113.140.15.90

$remote_user

客户端用户名称

–

$time_local

访问时间和时区

18/Jul/2012:17:00:01 +0800

$request

请求的URI和HTTP协议

“GET /pa/img/home/logo-alipay-t.png HTTP/1.1”

$http_host

请求地址，即浏览器中你输入的地址（IP或域名）

img.alipay.com

10.253.70.103

$status

HTTP请求状态

200

$upstream_status

upstream状态

200

$body_bytes_sent

发送给客户端文件内容大小

547

$http_referer

跳转来源

 “https://cashier.alipay.com…/”

$http_user_agent

用户终端代理

“Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; SV1; GTB7.0; .NET4.0C;

$ssl_protocol

SSL协议版本

TLSv1

$ssl_cipher

交换数据中的算法

RC4-SHA

$upstream_addr

后台upstream的地址，即真正提供服务的主机地址

10.228.35.247:80

$request_time

整个请求的总时间

0.205

$upstream_response_time

请求过程中，upstream响应时间

0.002

线上实例：

116.9.137.90 – [02/Aug/2012:14:47:12 +0800] “GET /images/XX/20100324752729.png HTTP/1.1″img.alipay.com 200 200 2038 https://cashier.alipay.com/XX/PaymentResult.htm"1" cellspacing="0" cellpadding="0"> 错误信息 错误说明 “upstream prematurely（过早的） closed connection” 请求uri的时候出现的异常，是由于upstream还未返回应答给用户时用户断掉连接造成的，对系统没有影响，可以忽略 “recv() failed (104: Connection reset by peer)” （1）服务器的并发连接数超过了其承载量，服务器会将其中一些连接Down掉； （2）客户关掉了浏览器，而服务器还在给客户端发送数据； （3）浏览器端按了Stop “(111: Connection refused) while connecting to upstream” 用户在连接时，若遇到后端upstream挂掉或者不通，会收到该错误 “(111: Connection refused) while reading response header from upstream” 用户在连接成功后读取数据时，若遇到后端upstream挂掉或者不通，会收到该错误 “(111: Connection refused) while sending request to upstream” Nginx和upstream连接成功后发送数据时，若遇到后端upstream挂掉或者不通，会收到该错误 “(110: Connection timed out) while connecting to upstream” nginx连接后面的upstream时超时 “(110: Connection timed out) while reading upstream”

nginx读取来自upstream的响应时超时

“(110: Connection timed out) while reading response header from upstream” nginx读取来自upstream的响应头时超时 “(110: Connection timed out) while reading upstream” nginx读取来自upstream的响应时超时 “(104: Connection reset by peer) while connecting to upstream” upstream发送了RST，将连接重置 “upstream sent invalid header while reading response header from upstream” upstream发送的响应头无效 “upstream sent no valid HTTP/1.0 header while reading response header from upstream” upstream发送的响应头无效 “client intended to send too large body” 用于设置允许接受的客户端请求内容的最大值，默认值是1M，client发送的body超过了设置值 “reopening logs” 用户发送kill  -USR1命令 “gracefully shutting down”, 用户发送kill  -WINCH命令 “no servers are inside upstream” upstream下未配置server “no live upstreams while connecting to upstream” upstream下的server全都挂了 “SSL_do_handshake() failed” SSL握手失败 “SSL_write() failed (SSL:) while sending to client”   “(13: Permission denied) while reading upstream”   “(98: Address already in use) while connecting to upstream”   “(99: Cannot assign requested address) while connecting to upstream”   “ngx_slab_alloc() failed: no memory in SSL session shared cache” ssl_session_cache大小不够等原因造成 “could not add new SSL session to the session cache while SSL handshaking” ssl_session_cache大小不够等原因造成 “send() failed (111: Connection refused)”  

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。