Add items to crontab: Difference between revisions
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=== crontab === | === crontab === | ||
The crontab can be used to execute tasks (scripts) based on a recurring schedule | The crontab can be used to execute tasks (scripts) based on a recurring schedule. The crontab is used, for example, to restart the webserver during the night. | ||
To view the content of | To view the content of your crontab, login to your QNAP via SSH and type: | ||
<pre>crontab -l | <pre>crontab -l | ||
</pre> | </pre> | ||
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You will see a (small) list of crontab entries. | You will see a (small) list of crontab entries. | ||
== Standard crontab jobs == | |||
The following table contains the standard QNAP jobs that run on schedules. | |||
This list is by no means complete. Jobs may depend on the firmware version, start times may vary. If you find a job on your QNAP, that is missing from the table, add it. The list could help to identify unwanted jobs that regularly wake up your harddisk(s). | |||
{| cellspacing="1" cellpadding="1" border="1" width="100%" | {| cellspacing="1" cellpadding="1" border="1" width="100%" | ||
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! scope="col" | Explanation<br/> | ! scope="col" | Explanation<br/> | ||
|- | |- | ||
| 0 4 * * * | | 0 4 * * *<br/> | ||
| /sbin/hwclock -s | | /sbin/hwclock -s | ||
| [http://linux.die.net/man/8/hwclock http://linux.die.net/man/8/hwclock]<br/> | | [http://linux.die.net/man/8/hwclock http://linux.die.net/man/8/hwclock]<br/> | ||
| Line 46: | Line 39: | ||
| vs_refresh is for share folder space usage calculation (for Network Share Management)<br/> | | vs_refresh is for share folder space usage calculation (for Network Share Management)<br/> | ||
|- | |- | ||
| 0 3 * * 0 | | 0 3 * * 0<br/> | ||
| /etc/init.d/idmap.sh dump | | /etc/init.d/idmap.sh dump | ||
| related to SAMBA Active Directory configuration. Used if security is set to ADS.<br/> | | related to SAMBA Active Directory configuration. Used if security is set to ADS.<br/> | ||
|- | |- | ||
| 0 3 * * * | | 0 3 * * *<br/> | ||
| /sbin/clean_reset_pwd | | /sbin/clean_reset_pwd | ||
| (unclear) might be the new behaviour of the network recycle bin (purging files after a certain amount of days)<br/> | | (unclear) might be the new behaviour of the network recycle bin (purging files after a certain amount of days)<br/> | ||
|- | |- | ||
| 0-59/15 * * * * | | 0-59/15 * * * *<br/> | ||
| /etc/init.d/nss2_dusg.sh | | /etc/init.d/nss2_dusg.sh | ||
| is a job of the Surveillance Station<br/> | | is a job of the Surveillance Station<br/> | ||
| Line 96: | Line 89: | ||
Here are a couple of examples that append new entries to the crontab file:<pre>echo "1 4 * * * /share/custom/scripts/custom1.sh" >> /etc/config/crontab | Here are a couple of examples that append new entries to the crontab file:<pre>echo "1 4 * * * /share/custom/scripts/custom1.sh" >> /etc/config/crontab | ||
echo "40 5 * * * /share/custom/scripts/custom2.sh" >> /etc/config/crontab</pre> | echo "40 5 * * * /share/custom/scripts/custom2.sh" >> /etc/config/crontab</pre> | ||
== Modifying entries == | == Modifying entries == | ||
'''<span style="color:red">Do NOT edit crontab the usual way!</span>''' | |||
On a desktop or server distribution, you would edit a user's crontab with: | |||
<pre>crontab -e</pre> | |||
However, due to the way the QNAP firmware updates crontab, it will be '''overwritten''' on the next reboot. Obviously, you want your automation to survive reboots, so edit the crontab file directly with your text editor: | |||
<pre>vi /etc/config/crontab</pre> | |||
or | or | ||
<pre>nano /etc/config/crontab</pre> | <pre>nano /etc/config/crontab</pre> | ||
== Restart the daemon == | == Restart the daemon == | ||
| Line 107: | Line 111: | ||
When you're done, reload the crontab file and restart the cron daemon: | When you're done, reload the crontab file and restart the cron daemon: | ||
<pre>crontab /etc/config/crontab && /etc/init.d/crond.sh restart</pre> | <pre>crontab /etc/config/crontab && /etc/init.d/crond.sh restart</pre> | ||
== Notes == | == Notes == | ||
| Line 113: | Line 119: | ||
<pre>chmod +x filename.sh</pre> | <pre>chmod +x filename.sh</pre> | ||
[[Category:Adding new services]] | <div><span style="font-size:smaller">''These instructions have been tested on various versions of QNAP firmware from 3.6.0 onwards.''</span><br/></div> [[Category:Adding new services]] | ||
Latest revision as of 16:49, 12 December 2016
Background
Skills required
You must be able to connect to your QNAP device using SSH and edit using a text editor such as vi or nano.
crontab
The crontab can be used to execute tasks (scripts) based on a recurring schedule. The crontab is used, for example, to restart the webserver during the night.
To view the content of your crontab, login to your QNAP via SSH and type:
crontab -l
You will see a (small) list of crontab entries.
Standard crontab jobs
The following table contains the standard QNAP jobs that run on schedules.
This list is by no means complete. Jobs may depend on the firmware version, start times may vary. If you find a job on your QNAP, that is missing from the table, add it. The list could help to identify unwanted jobs that regularly wake up your harddisk(s).
| Default Time |
Job |
Explanation |
|---|---|---|
| 0 4 * * * |
/sbin/hwclock -s | http://linux.die.net/man/8/hwclock |
| 0 3 * * * | /sbin/vs_refresh | vs_refresh is for share folder space usage calculation (for Network Share Management) |
| 0 3 * * 0 |
/etc/init.d/idmap.sh dump | related to SAMBA Active Directory configuration. Used if security is set to ADS. |
| 0 3 * * * |
/sbin/clean_reset_pwd | (unclear) might be the new behaviour of the network recycle bin (purging files after a certain amount of days) |
| 0-59/15 * * * * |
/etc/init.d/nss2_dusg.sh | is a job of the Surveillance Station |
| 10 15 * * * | /usr/bin/power_clean -c 2>/dev/null | ? |
| 4 3 * * 3 | /etc/init.d/backup_conf.sh | does an automatic backup of several config files in /etc/config. |
| 0 3 * * * |
/bin/rm -rf /mnt/HDA_ROOT/twonkymedia/twonkymedia.db/cache/* |
Will clear the Twonky media cache |
| 5 0 * * 1 |
/etc/init.d/antivirus.sh scan 1 |
If Antivirus is enabled, this will scan the files for viruses |
| 0 0 * * * |
/etc/init.d/antivirus.sh archive_log |
If Antivirus report jobs are enabled |
| 0 0 */1 * * |
/etc/init.d/antivirus.sh update_db |
If Antivirus is enabled, this will check clamav.net for updates |
| /etc/init.d/startup |
If a restart/powerof job is configured in power management | |
| /etc/init.d/poweroff |
If a restart/powerof job is configured in power management |
Adding entries at the command-line
Here are a couple of examples that append new entries to the crontab file:
echo "1 4 * * * /share/custom/scripts/custom1.sh" >> /etc/config/crontab echo "40 5 * * * /share/custom/scripts/custom2.sh" >> /etc/config/crontab
Modifying entries
Do NOT edit crontab the usual way!
On a desktop or server distribution, you would edit a user's crontab with:
crontab -e
However, due to the way the QNAP firmware updates crontab, it will be overwritten on the next reboot. Obviously, you want your automation to survive reboots, so edit the crontab file directly with your text editor:
vi /etc/config/crontab
or
nano /etc/config/crontab
Restart the daemon
When you're done, reload the crontab file and restart the cron daemon:
crontab /etc/config/crontab && /etc/init.d/crond.sh restart
Notes
Don't forget to make your scripts executable! Otherwise they will silently fail! You tested your script, right?
chmod +x filename.sh
These instructions have been tested on various versions of QNAP firmware from 3.6.0 onwards.