36 lines
1.5 KiB
Markdown
36 lines
1.5 KiB
Markdown
[[!meta title="Anacron and cronie: How cron.hourly, cron.daily and cron.weekly work"]]
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## Situation
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We noticed that the [nginx](http://nginx.org/) logfile is not being rotated
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on some freshly setup Centos 6.2 servers, which should have been triggered by
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logrotate running from cron. The used cron implementation is cronie together
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with anacron.
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## Background
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I first suspected the setup being broken due permissions issues
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with cronie, which requires special permissions as found in the
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**CAVEATS** section of cron(8):
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The crontab files have to be regular files or symlinks to regular files,
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they must not be executable or writable by anyone else than the owner.
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This requirement can be overridden by using the -p option on the crond command line.
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We had this bug before, but this time it is different:
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* The Logrotate cronjob is located at **/etc/cron.daily/logrotate**
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* The cron.{daily, weekly, monthly} jobs are defined in **/etc/anacrontab**
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* The **anacron** command interprets jobs in **/etc/anacrontab**
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* Anacron is called from **/etc/cron.hourly/0anacron**
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* **/etc/cron.d/0hourly** contains **01 * * * * root run-parts /etc/cron.hourly**
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## Solution
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In our situation **/etc/cron.d/0hourly** was missing, because we removed all
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files from **/etc/cron.d/** and put only our own files in there. The simple
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fix is to ensure the contents of this directory are not removed anymore and to
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reinstall the **cronie** package to recreate the **/etc/cron.d/0hourly** file.
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[[!tag config sysadmin localch unix]]
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