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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.
 
Test Your Knowledge in Computers #895
Difficulty: Medium
The GNU Core Utilities or coreutils is a package of GNU software containing reimplementations for many of the basic tools, such as cat, ls, and rm, which are used on Unix-like operating systems.
True or False?

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Poll(4) 						     Kernel Interfaces Manual							   Poll(4)

NAME
Poll - Contains information specifying when the UNIX-to-UNIX Copy Program (UUCP) should poll designated remote computers SYNOPSIS
/usr/lib/uucp/Poll DESCRIPTION
The /usr/lib/uucp/Poll file contains information for polling remote computers. Each entry in the Poll file contains the name of a remote computer to call, followed by a <TAB> character, and a sequence of hourly intervals expressed in digits. These are the hourly intervals at which the local system polls a remote system; you must specify interval times as digits between 0 and 23. The format of entries in the Poll file is: sys-name<TAB>hour Note that you must be logged in as root to edit the Poll file, which is owned by the uucp login ID. The Poll file is used with the crontabs/uucp file, the uudemon.hour script, and the uudemon.poll script. Together, these files are respon- sible for initiating automatic calls to remote systems to perform certain maintenance tasks. EXAMPLES
The following example provides polling of computer eagle every 4 hours: eagle 0 4 8 12 16 20 The follwing example provides polling of computer hera every hour: hera 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 FILES
Contains all the configuration files for UUCP, including the Devices file. Describes accessible remote systems. Initiates file transport calls to remote systems. Polls remote systems listed in /usr/lib/uucp/Poll file. The uucp file that contains instructions for the cron daemon. RELATED INFORMATION
Commands: crontab(1) Daemons: cron(8) delim off Poll(4)

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