苹果电脑如何用防火墙限制流量
网站访问不到的可能错误
php的日志是值得关注的，包含错误日志和慢日志
一 错误输出
找到php.ini
比如会捕获到类似信息：
[23-Oct-2011 17:17:41] PHP Fatal error: Class 'Strclass' not found in /Data/webapps/www.aslibra.com/application/errors/error_404.php on line 11
这个有助于分析被访问的页面发生的致命错误或者是警告
二 慢日志
慢日志和数据库的慢查询有点类似，会记录下来执行超过多少时间的php执行的内容
这个如果是用fast-cgi的话，可以在fpm的配置里面有
比如上面是记录超过10秒的php，记录在相应的文件里
你可以拿到类似的日志：
日志里包含的信息：执行时间，访问入口，执行的函数的顺序和所有父级调用关系
比如这里可以获知是数据库查询时出现过慢，调用关系也一目了然，可以去排查跟踪了
原创内容如转载请注明：来自 阿权的书房
一 错误输出
找到php.ini
log_errors = On
; Log errors to specified file.
error_log = /Data/logs/php/error.log
; Log errors to specified file.
error_log = /Data/logs/php/error.log
比如会捕获到类似信息：
[23-Oct-2011 17:17:41] PHP Fatal error: Class 'Strclass' not found in /Data/webapps/www.aslibra.com/application/errors/error_404.php on line 11
这个有助于分析被访问的页面发生的致命错误或者是警告
二 慢日志
慢日志和数据库的慢查询有点类似，会记录下来执行超过多少时间的php执行的内容
这个如果是用fast-cgi的话，可以在fpm的配置里面有
The timeout (in seconds) for serving of single request after which a php backtrace will be dumped to slow.log file
'0s' means 'off'
<value name="request_slowlog_timeout">10s</value>
The log file for slow requests
<value name="slowlog">/Data/logs/php/slow.log</value>
'0s' means 'off'
<value name="request_slowlog_timeout">10s</value>
The log file for slow requests
<value name="slowlog">/Data/logs/php/slow.log</value>
比如上面是记录超过10秒的php，记录在相应的文件里
你可以拿到类似的日志：
Oct 23 23:00:20.528849 pid 11586 (pool default)
script_filename = /www.aslibra.com/index.php
[0x00007fffae1869e0] mysql_query() /www.aslibra.com/system/database/drivers/mysql/mysql_driver.php:163
[0x00007fffae186bb0] _execute() /www.aslibra.com/system/database/DB_driver.php:453
[0x00007fffae186eb0] simple_query() /www.aslibra.com/system/database/DB_driver.php:299
[0x00007fffae1870b0] query() /www.aslibra.com/v3/models/myuser.php:51
[0x00007fffae1872a0] get_users_by_uids() /www.aslibra.com/v3/models/myuser.php:58
[0x00007fffae187580] get_users() /www.aslibra.com/v3/controllers/pic.php:134
[0x00007fffae187870] experience() /www.aslibra.com/v3/controllers/pic.php:349
[0x00007fffae187940] user() unknown:0
[0x00007fffae187cf0] call_user_func_array() /www.aslibra.com/system/core/CodeIgniter.php:297
[0x00007fffae187f40] +++ dump failed
script_filename = /www.aslibra.com/index.php
[0x00007fffae1869e0] mysql_query() /www.aslibra.com/system/database/drivers/mysql/mysql_driver.php:163
[0x00007fffae186bb0] _execute() /www.aslibra.com/system/database/DB_driver.php:453
[0x00007fffae186eb0] simple_query() /www.aslibra.com/system/database/DB_driver.php:299
[0x00007fffae1870b0] query() /www.aslibra.com/v3/models/myuser.php:51
[0x00007fffae1872a0] get_users_by_uids() /www.aslibra.com/v3/models/myuser.php:58
[0x00007fffae187580] get_users() /www.aslibra.com/v3/controllers/pic.php:134
[0x00007fffae187870] experience() /www.aslibra.com/v3/controllers/pic.php:349
[0x00007fffae187940] user() unknown:0
[0x00007fffae187cf0] call_user_func_array() /www.aslibra.com/system/core/CodeIgniter.php:297
[0x00007fffae187f40] +++ dump failed
日志里包含的信息：执行时间，访问入口，执行的函数的顺序和所有父级调用关系
比如这里可以获知是数据库查询时出现过慢，调用关系也一目了然，可以去排查跟踪了
原创内容如转载请注明：来自 阿权的书房
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