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