参考资料
apache官方文档 apache logs
关于error log
今天在一台测试服务器上测试项目时,有一个请求返回了500状态码,web服务器使用的是apache,于是就查找apache错误日志,却发现日志是空的.好奇怪.
后来查资料,发现,错误记录也是有级别的
| Level | Description | Example |
|---|---|---|
emerg |
Emergencies - system is unusable.紧急状况;服务器无法使用 | "Child cannot open lock file. Exiting" |
alert |
Action must be taken immediately.必须立刻采取动作 | "getpwuid: couldn‘t determine user name from uid" |
crit |
Critical Conditions.危急状况 | "socket: Failed to get a socket, exiting child" |
error |
Error conditions.出现错误 | "Premature end of script headers" |
warn |
Warning conditions.警告 | "child process 1234 did not exit, sending another SIGHUP" |
notice |
Normal but significant condition.正常,但有情况要注意 | "httpd: caught SIGBUS, attempting to dump core in ..." |
info |
Informational.普通信息 | "Server seems busy, (you may need to increase StartServers, or Min/MaxSpareServers)..." |
debug |
Debug-level messages.调试级别信息,包括模块运行状态 | "Opening config file ..." |
这个错误级别记录在apache的配置文件httpd.conf或者虚拟主机配置文件中
ErrorLog "logs/error_log" # # LogLevel: Control the number of messages logged to the error_log. # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. # LogLevel alert
其中,LogLevel就指定了最低要记录的错误级别,我公司这台测试服务器原来的级别是alert,太高了,导致很多错误不会记录,因此我设置为info,重启apache,然后重现错误,终于在error_log中发现了错误原因:
[Tue Jul 25 17:33:06.476703 2017] [:error] [pid 2316:tid 3328] [client 113.47.63.8:49522] PHP Fatal error: Call to undefined function Awap\\Controller\\getLogger() in 项目路径\\Application\\Awap\\Controller\\AdvertiserController.class.php on line 533, referer: http://www.xxxx.com/Awap/Advertiser/register
原来是php报了错,后来追项目的源码,发现是php返回了500的状态码.
那为什么apache 的error_log会记录PHP的错误呢,apache文档中是这样说的:
The error log will also contain debugging output from CGI scripts. Any information written to stderr by a CGI script will be copied directly to the error log.
意思是:php作为一个CGI脚本,它的标准错误(stderr)被复制了一份放在了apache error log中.
apache推荐最低级别为crit,具体设置为哪个,还是根据自己的需求来设定吧!
关于access_log
以下是我的笔记,大概记录了一下,详情请查看文章头部的链接
Related Modules:mod_log_config mod_setenvif
Related Directives:CustomLog LogFormat SetEnvIf
access log的作用:access log记录了所有服务器处理过的请求.
access log的存放路径和内容由 CustomLog指令控制,
使用LogFormat指令可以简单地指定在内容中需要显示的项目,
举例,下面代码中的黄色区域,CustomLog指定了access log的存放路径
<VirtualHost *:80>
LogLevel info
DocumentRoot "E:\qprwork\project"
ErrorLog "logs/myapp.com-error.log"
CustomLog "logs/myapp.com-access.log" combined
ServerName myapp.com
<Directory "E:\qprwork\project">
Options Indexes FollowSymLinks
AllowOverride All
Order allow,deny
Allow from all
</Directory>
</VirtualHost>
那个combined是啥?他是告诉log的记录格式的.这个就和LogFormat有关了
LogFormat指令分为两部分,第一部分是格式,第二部分为nickname,
以下摘自httpd.conf,蓝色就是LogFormat,其中左侧百分号那一串是格式,右侧combined是nickname
<IfModule log_config_module>
#
# The following directives define some format nicknames for use with
# a CustomLog directive (see below).
#
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %b" common
<IfModule logio_module>
# You need to enable mod_logio.c to use %I and %O
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio
</IfModule>
#
# The location and format of the access logfile (Common Logfile Format).
# If you do not define any access logfiles within a <VirtualHost>
# container, they will be logged here. Contrariwise, if you *do*
# define per-<VirtualHost> access logfiles, transactions will be
# logged therein and *not* in this file.
#
CustomLog "e:/wamp/logs/access.log" common
#
# If you prefer a logfile with access, agent, and referer information
# (Combined Logfile Format) you can use the following directive.
#
#CustomLog "logs/access.log" combined
</IfModule>
在定制CustomLog时,可以使用nickname指定需要的格式,如上面代码片段中的 CustomLog "logs/myapp.com-access.log" combined
以下是apache的access_log片段
127.0.0.1 - - [25/Jul/2017:22:42:06 +0800] "GET /advertiser/index/monolog HTTP/1.1" 200 195 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36" 127.0.0.1 - - [25/Jul/2017:22:42:06 +0800] "GET /favicon.ico HTTP/1.1" 200 1150 "http://myapp.com/advertiser/index/monolog" "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"