Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: [Tip] How to add individual delays to a cron job?
Top Forums UNIX for Advanced & Expert Users [Tip] How to add individual delays to a cron job? Post 302882545 by blackrageous on Tuesday 7th of January 2014 06:30:37 PM
Old 01-07-2014
I am not sure what problem this solves and a number of issues are raised:
  • Big Unix Environment
  • Submitting jobs to thousands of systems
  • load peaks for shared resources
For example, depending on what the task is and the targets, this could just be a matter of updating cron entries on the end systems as opposed to scheduling tasks from the cron of a single system or set of systems. Doing this for a thousand or so systems seems problematic.



I would not do this for a thousand systems, but rather I would either distribute crontabs to remote systems or look for an enterprise sheduling solution (open software; an example of paid-for solutions are products like Control-M).


Enterprise schedulers provide such features as distribution, redundancy and central reporting.


Just a thought.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

CRON usage for CRON job

can anybody explain the usage of CRON for adding a cron job. please provide an example also for better understanding !!! Thanks (1 Reply)
Discussion started by: skyineyes
1 Replies

2. Solaris

cron job starts new cron proccess

I run cron in solaris 10 zone. One cron job which syncing files to nfs mounted on container, creates after finishing another cron proccess(/usr/sbin/cron), and after 100 existing cron proccesses next cron job will not start. It's too weird for me, I'm not able to solve this problem. Theoretically... (3 Replies)
Discussion started by: ron76
3 Replies

3. Shell Programming and Scripting

Cron Job help

I need to write the cron job for the following scenario, Please help me out The CRON job runs sometime at night on Saturday and checks if there are more than eight files in the /PROCESSED folder. Any files over and above eight are deleted based on ascending order of date (eight most recent... (10 Replies)
Discussion started by: sandeep.dwivedi
10 Replies

4. Shell Programming and Scripting

How to add cron job in /etc/crontab

Hi, How to add a cron job in /etc/crontab using a shell script.??:confused: Actually the requirement is we need to run a script say, XXX.sh every 10 min through “cron”. That can be achieved by adding the below code line in the /etc/crontab , (i.e., “crontab -e ” command to add this to the... (4 Replies)
Discussion started by: Dedeepthi
4 Replies

5. Solaris

Cron job running even after cron is removed

Hi , I have removed a cron for particular user , but cron job seems to be running even after the cron entry is removed. The purpose of the cron was to sendmail to user ( it uses mailx utility ) I have restarted cron and sendmail service still user is getting mail alerts from the cron job. And... (4 Replies)
Discussion started by: chidori
4 Replies

6. Shell Programming and Scripting

Commented cron job -- cron monitoring

Hi I have a requirement to write a shell script,that will check the all commented job in cron job.Please help !! (2 Replies)
Discussion started by: netdbaind
2 Replies

7. UNIX for Advanced & Expert Users

[Tip] How to add an application cron job?

A well established form of application cron jobs look like this: 39 15 * * * && /usr/local/monitoring/oracle/check_dbs.sh >/dev/null 2>&1The repetition makes it a long line, hard to read, hard to maintain. I suggest the following instead: 39 15 * * * { /usr/local/monitoring/oracle/check_dbs.sh... (1 Reply)
Discussion started by: MadeInGermany
1 Replies

8. Shell Programming and Scripting

Cron job - Need to run Cron every quarter at particular time

Hi, 1) If some job supposed to run on 1st of every month at 7 AM In cron job when we have a blackout on the 1st ( i.e when 1st falls on a sunday ) how can we make the job run the next business day? 2) How can we run a job on 25th of every quarter 7 AM(jan,apr,jul,oct) And if 25th... (5 Replies)
Discussion started by: System Admin 77
5 Replies

9. UNIX for Beginners Questions & Answers

Add TimeStamp to cron job and write file name sent

Hello, I have written a cron job to automate the sftp of files using key authentication. I wanted to add a timeStamp and name of file sent to a log file and append each these details to the same file each time files are sent and if possible include whether the files were sent successfully or not.... (3 Replies)
Discussion started by: KidKoder
3 Replies

10. UNIX for Advanced & Expert Users

Tip: inotify cron

Dear members, moderators and others. While working on <insert project>, a need has surfaced to watch a directory, and when a file comes, to do appropriate action. So, i started writing some shell code, aware of linux inotify-tools package with inotifywait. Also, i'm seeing a lot of similar... (1 Reply)
Discussion started by: Peasant
1 Replies

LEARN ABOUT OSF1

queuedefs

queuedefs(4)						     Kernel Interfaces Manual						      queuedefs(4)

NAME

       queuedefs - Queue description file for at, batch, and cron commands

DESCRIPTION

       The  queuedefs  file describes the characteristics of the queues managed by cron or specifies other characteristics for cron.  Each noncom-
       ment line in this file describes either one queue or a cron characteristic.  Each uncommented line should be in one of the  following  for-
       mats.

	    q.[njobj][nicen][nwaitw] max_jobs=mjobs log=lcode

       The  fields  in these lines are as follows: The name of the queue.  Defined queues are as follows: The default queue for jobs started by at
       The default queue for jobs started by batch The default queue for jobs run from a crontab file

	      Queues d to z are also available for local use.  The maximum number of jobs that can be run simultaneously in  the  queue;  if  more
	      than  njob jobs are ready to run, only the first njob jobs will be run.  The others will be initiated as currently running jobs ter-
	      minate.  The nice(1) value to give to all jobs in the queue that are not run with a user ID of superuser.  The number of seconds	to
	      wait  before rescheduling a job that was deferred because more than njob jobs were running in that queue, or because the system-wide
	      limit of jobs executing (max_jobs) has been reached.  The maximum number of active jobs from all queues that  may  run  at  any  one
	      time.  The default is 25 jobs.  Logging level of messages sent to a log file.  The default is 4.	Defined levels are as follows:

	      level-code   level

		  0	   None

		  1	   Low

		  2	   Medium

		  3	   High

		  4	   Full

       Lines beginning with # are comments, and are ignored.

EXAMPLES

       The  following  file specifies that the b queue, for batch jobs, can have up to 50 jobs running simultaneously; that those jobs will be run
       with a nice value of 20.  If a job cannot be run because too many other jobs are running, cron will wait 60 seconds before trying again	to
       run it.	All other queues can have up to 100 jobs running simultaneously;  they will be run with a nice value of 2.  If a job cannot be run
       because too many other jobs are running cron will wait 60 seconds before trying again to run it.  b.50j20n60w

       The following file specifies that a total of 25 active jobs will be allowed by cron over all the queues at any one time, and cron will  log
       all messages to the log file.  The last two lines are comments that are ignored.  max_jobs=25 log=4 # This is a comment # And so is this

FILES

       Main cron directory The default location for the queue description file.

RELATED INFORMATION

       Commands: at(1), cron(8), crontab(1), nice(1)
       delim off

																      queuedefs(4)
All times are GMT -4. The time now is 12:15 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy