Ubuntu中怎么启用Crontab日志记录

2025-03-17 02:01:34
推荐回答(2个)
回答1:

在ubuntu下安装crontab后,系统默认未开启crontab的日志记录。
启用crontab的日志的办法:

修改rsyslog文件,将/etc/rsyslog.d/50-default.conf 文件中的#cron.*前的#删掉;
重启rsyslog服务:

 
service rsyslog restart;

重启cron服务:
 

service cron restart;

查看日志:
more /var/log/cron.log;
查看运行时的日志文件,如果在日志文件中出现:
No MTA installed, discarding output
则crontab执行脚本时是不会直接错误的信息输出,而是会以邮件的形式发送到邮箱里,需要邮件服务器了,如果没有安装邮件服务器,它就会报这个错。
如果是测试,可以参考以下方法:

在每条定时脚本后面加入:

>/dev/null 2>&1

即将所有信息输入到linux操作系统中的空设备/dev/null中。

即可解决No MTA installed, discarding output的问题。

回答2:

在ubuntu下安装crontab后,系统默认的是不开启crontab的日志记录的,启用crontab的日志的办法:
修改rsyslog文件,将/etc/rsyslog.d/50-default.conf 文件中的#cron.*前的#删掉;
重启rsyslog服务service rsyslog restart;
重启cron服务service cron restart;代码如下:
more /var/log/cron.log;
就可以查看运行时的日志文件,如果在日志文件中出现:
代码如下:
No MTA installed, discarding output
那么就是说,crontab执行脚本时是不会直接错误的信息输出,而是会以邮件的形式发送到你的邮箱里,这时候就需要邮件服务器了,如果你没有安装邮件服务器,它就会报这个错。如果是测试,可以用下面的办法来解决:
在每条定时脚本后面加入:
代码如下:
>/dev/null 2>&1

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