free
/
freedomboneeee
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

crontab example

This commit is contained in:
Bob Mottram 2014-04-11 20:24:30 +01:00
parent a3f20ac648
commit 4bb8978a46
1 changed files with 34 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
beaglebone.txt
View File

@ -681,12 +681,18 @@ Select "/dynamic DNS/" then click "/quick cron example/"
An example would look like:
#+BEGIN_SRC: bash
4,9,14,19,24,29,34,39,44,49,54,59 * * * * root sleep 29 ; /usr/bin/timeout 120 wget -O - https://free\ dns.afraid.org/dynamic/update.php?ABCKDNRCLFHENSLKNFEGSBFLFF== >> /\ tmp/freedns_mysubdomain_us_to.log 2>&1 &
4,14,24,34,44,54 * * * * root sleep 29 ; /usr/bin/timeout 200 wget -O - https://free\ dns.afraid.org/dynamic/update.php?ABCKDNRCLFHENSLKNFEGSBFLFF== >> /dev/null 2>&1 &
#+END_SRC
It's important to make sure that you change the *http* to *https*, since this will help to prevent a potential attacker from hijacking your site and redirecting it to a fake version for the purposes of obtaining your login details.
Edit */etc/crontab* and append that to the end of the file.
Edit */etc/crontab* and append that to the top of the file, underneath the heading line which looks like this:
#+BEGIN_SRC: bash
# m h dom mon dow user command
#+END_SRC
In general the most frequently run crontab entries should be at the top. Then save and exit.
Via your router's firewall settings you should now open port 22 (secure shell). This will allow you to ssh into your BBB from any location - not just your own local network.
@ -725,7 +731,7 @@ emacs /etc/crontab
You can replace the multiple freedns entries with a single line:
#+BEGIN_SRC: bash
*/10 * * * * root /usr/bin/timeout 60 /usr/bin/dynamicdns
*/10 * * * * root /usr/bin/timeout 200 /usr/bin/dynamicdns
#+END_SRC
Then save and exit and restart the cron daemon.
@ -734,6 +740,8 @@ Then save and exit and restart the cron daemon.
service cron restart
#+END_SRC
If you want to know what a typical /crontab/ file might look like then see the [[Example crontab file]]
** Set the host name
#+BEGIN_SRC: bash
@ -6385,6 +6393,29 @@ Then reboot the server with:
reboot
#+END_SRC
** Example crontab file
This is an example of what your crontab file might look like, with the more frequently run tasks at the top. For the two most frequent tasks specific minutes within each hour are given and they're arranged to try to minimise the number of things running simultaneously.
#+BEGIN_SRC: bash
# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.
SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
# m h dom mon dow user command
10,20,30,40,50 * * * * root /usr/bin/timeout 120 /usr/bin/dynamicdns && /usr/bin/spamfilter myusername
15,35,55 * * * * root cd /var/www/mydomainname/htdocs; /usr/bin/timeout 240 /usr/bin/php include/poller.php
17 * * * * root cd / && run-parts --report /etc/cron.hourly
25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
#+END_SRC
* Deprecated
The following items have been deprecated until such time as a successful installation is achieved.