Centos6 下 logrotate 探源1

franket

发布于 2022-07-10 00:01:49

2240

发布于 2022-07-10 00:01:49

可知对于Centos6每日的计划任务不在crontab里定义

实际定义位置是anacrontab

[root@Test-slave ~]# cat /etc/anacrontab 
# /etc/anacrontab: configuration file for anacron

# See anacron(8) and anacrontab(5) for details.

SHELL=/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
# the maximal random delay added to the base delay of the jobs
RANDOM_DELAY=45
# the jobs will be started during the following hours only
START_HOURS_RANGE=3-22

#period in days   delay in minutes   job-identifier   command
1	5	cron.daily		nice run-parts /etc/cron.daily
7	25	cron.weekly		nice run-parts /etc/cron.weekly
@monthly 45	cron.monthly		nice run-parts /etc/cron.monthly
[root@Test-slave ~]#

它的意义是:每一天的3点到22点期间随机延时45分钟+5分钟，执行/etc/cron.daily中的任务，通知给root (此处只对daily work进行解释，其它类推)

然后我们看看/etc/cron.daily下的内容

[root@Test-slave ~]# ll /etc/cron.daily
total 28
-rwx------. 1 root root  118 Oct 15 23:33 cups
-rwxr-xr-x. 1 root root  196 Jul 18  2013 logrotate
-rwxr-xr-x. 1 root root  905 Feb 22  2013 makewhatis.cron
-rwxr-xr-x. 1 root root  174 Sep 24  2012 mlocate.cron
-rwxr-xr-x. 1 root root 2126 Jul 19  2013 prelink
-rwxr-xr-x. 1 root root  563 Nov 23  2013 readahead.cron
-rwxr-xr-x. 1 root root  365 Oct 16  2009 tmpwatch
[root@Test-slave ~]#

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