西数超哥博客我们经常遇到各种各样的nginx错误日志，平时根据一些nginx错误日志就可以分析出原因了。不过不是很系统，这里网上看到一篇资料还是比较系统的关于nginx的error.log的详细说明，这里记录下，方便以后查看了解。
| 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)” |
以上表格来自网络资料。这里只是记录下，方便以后查看。
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