On Ubuntu 9.10 (and presumably, on later versions), anacron seems to be set up as follows:
There is a Upstart task, located in /etc/init/anacron.conf, which runs all the jobs in /etc/anacrontab. It is set to run on startup.
There is a cron.d file (/etc/cron.d/anacron) which causes the Upstart task to be started every day at 7:30 AM.
There is a file /etc/apm/event.d/anacron, which causes the Upstart task to be started when a laptop is plugged in to A/C power, or woken up.
In the system crontab (/etc/crontab), if anacron is not execuatable, run-parts is used to run the files in cron.daily, cron.weekly, and cron.monthly at 6:25 AM, 6:47 AM and 6:52 AM, respectively.
In /etc/anacrontab, run-parts is used to run cron.daily 5 minutes after anacron is started, and cron.weekly after 10 minutes (once a week), and cron.monthly after 15 (once a month).
Within the cron.daily, weekly, and monthly directories ( /etc/cron.daily, etc.) there is a 0anacron file that sets the timestamps for anacron, so it will know they have been run, even if it didn't run them.
So it appears anacron is run on every startup, wake up, plug-in, and at 7:30 AM every day. Looking at the respective Changelogs and package databases, it looks like this setup is directly from Debian, and hasn't been changed since at least 2009.
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| First created Jul 30 2011 ~ Last revised September 19, 2011 |
