What does Logrotate do?_what is log rotate-优快云博客

本文链接：https://blog.youkuaiyun.com/xuebintian/article/details/51078383

本文介绍了Logrotate的基本功能，包括如何通过配置实现日志文件的周期性管理，防止日志文件过大导致服务器负担加重。文章详细展示了Apache和Tomcat的日志配置示例。

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Logrotate helps to manage your log files. It can periodically read, minimize, back up, creates new log files, and basically anything you may ever want to do with them. This is usually used to to help prevent any single log file from getting unwieldy in size. It is commonly also used to delete old log files so as not to fill your server's hard drive.

Many apps setup Logrotate for you. For instance, installing Apache in Ubuntu adds the file /etc/logrotate.d/apache2, which is a configuration files used by Logrotate to rotate all apache access and error logs.

Configuring Logrotate

In stock Ubuntu, any config file you put into /etc/logrotate.d is going to run once per day. Logs are typically rotated once per day or less (Apache default in Ubuntu is in fact weekly).

Default Apache

Let's look over Apache's default in Ubuntu - /etc/logrotate.d/apache2.

http://linuxcommand.org/man_pages/logrotate8.html

关于日志的一般设置日志过滤

ErrorLog "|/opt/xxx/install/cronolog/sbin/cronolog /home/admin/yyy/logs/cronolog/%Y/%m/%Y-%m-%d-error_log"
LogLevel warn
LogFormat "%h %D %{X_READTIME}i %t \"%m http://%V%U%q\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
SetEnvIf Remote_Addr "127\.0\.0\.1" dontlog
SetEnvIf Request_URI "^/robots\.txt$" dontlog
SetEnvIf Request_URI "\.swf$" dontlog
SetEnvIf Request_URI "\.gif$" dontlog
SetEnvIf Request_URI "\.jpg$" dontlog
SetEnvIf Request_URI "\.ico$" dontlog
SetEnvIf Request_URI "\.jpeg$" dontlog
SetEnvIf Request_URI "\.bmp$" dontlog
SetEnvIf Request_URI "\.png$" dontlog
SetEnvIf Request_URI "\.js$" dontlog
SetEnvIf Request_URI "\.css$" dontlog
SetEnvIf Request_URI "\.wav$" dontlog
SetEnvIf Request_URI "\.swf$" dontlog
SetEnvIf Request_URI "home/css" dontlog
SetEnvIf Request_URI "/auction/auto/*" dontlog
SetEnvIf Request_URI "/auction/associate_categories.htm*" dontlog
SetEnvIf Request_URI "/auction/latest_visit.htm*" dontlog
CustomLog "|/opt/xxx/install/cronolog/sbin/cronolog /home/admin/cai/logs/cronolog/%Y/%m/%Y-%m-%d-xxx-access_log" combined env=!dontlog

Tomcat 为每个web app 产生一个 access log file

方法：添加一个文件

位置：tomcat7/webapps/web_name/META-INF

文件名：context.xml

文件内容：

<?xml version='1.0' encoding='utf-8'?>
<Context path="/precheck">
    <Valve className="org.apache.catalina.valves.AccessLogValve" 
        directory="logs"
        prefix="localhost_access_log_test."
        suffix=".txt"
        pattern="combined"
        fileDateFormat="yyyy-MM-dd"
        resolveHosts="false" />
</Context>

参考文档： https://tomcat.apache.org/tomcat-7.0-doc/config/context.html