aix:aix_crontab
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aix:aix_crontab [2024/01/11 10:09] manu [Crontab and log management] |
aix:aix_crontab [2025/04/29 15:59] (current) manu |
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| [root@aixna001]/root> crontab -l lpar2rrd | [root@aixna001]/root> crontab -l lpar2rrd | ||
| 0 1 * * * /usr/bin/perl /opt/lpar2rrd-agent/lpar2rrd-agent.pl lnxmonitor01 > /var/tmp/lpar2rrd-agent.out 2>&1 | 0 1 * * * /usr/bin/perl /opt/lpar2rrd-agent/lpar2rrd-agent.pl lnxmonitor01 > /var/tmp/lpar2rrd-agent.out 2>&1 | ||
| + | 40 18 * * 1,2,3,4,5 ( . /home/lpar/.bash_profile ; /myscript/script01.sh ) >/dev/null 2>&1 | ||
| </cli> | </cli> | ||
| Line 25: | Line 26: | ||
| </cli> | </cli> | ||
| + | Fields description | ||
| + | * minute: 0 through 59 | ||
| + | * hour: 0 through 23 | ||
| + | * day_of_month: 1 through 31 | ||
| + | * month: 1 through 12 | ||
| + | * weekday: 0 through 6 for Sunday through Saturday | ||
| + | FIXME | ||
| + | On linux (NOT AIX) you can also use for very 10 minutes, */10 | ||
| + | 0,10,20,30,40,50 6 * * 1-5 /usr/bin/calendar | ||
| + | */10 * * 1-5 /usr/bin/calendar | ||
| ==== Cron log ==== | ==== Cron log ==== | ||
| Line 50: | Line 60: | ||
| compress | compress | ||
| </cli> | </cli> | ||
| + | |||
| + | ==== Errors ==== | ||
| + | |||
| + | I found that the log is located in **/var/adm/log**. Further we are getting this error repeatedly ever since this date/time. How do I clear this max limit? | ||
| + | c queue max run limit reached Fri Nov 25 21:52:00 2016 | ||
| + | ! rescheduling a cron job Fri Nov 25 21:52:00 2016 | ||
| + | | ||
| + | The cron daemon has a limit of how many jobs it can run simultaneously. By default it is 100 jobs. If a new job is scheduled to run, and the limit has already been reached, the job will be rescheduled at a later time (the default is 60 seconds later). Both the number of jobs and wait time are configured in the file **/var/adm/cron/queuedefs**. | ||
| + | |||
| + | To do this, add an entry to the bottom of the /var/adm/cron/queuedefs file using an editor such as vi. The entry should have the form: | ||
| + | c.50j20n60w | ||
| + | where | ||
| + | * c. = The "c" or cron queue, followed by a period separator. | ||
| + | * Nj = The maximum number of jobs to be run simultaneously by cron, followed by the letter "j". | ||
| + | * Nn = The "nice" value of the jobs to be run (default is 2), followed by the letter "n". | ||
| + | * Nw = The time a job has to wait until the next attempt to run it, followed by the letter "w". | ||
| + | |||
| + | For example: | ||
| + | This example would set the cron queue to a maximum of 200 jobs, with a nice value of 2, and a wait time of 60 seconds. | ||
| + | <cli prompt='#'> | ||
| + | root@orathal-test /var/tmp# cat /var/adm/cron/queuedefs | ||
| + | c.200j2n60w | ||
| + | </cli> | ||
| + | |||
| + | c.200j2n60w | ||
| + | |||
aix/aix_crontab.1704964159.txt.gz · Last modified: 2024/01/11 10:09 by manu
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