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Full Discussion: Script that will look the same as Cron
Top Forums Shell Programming and Scripting Script that will look the same as Cron Post 303037767 by rbatte1 on Tuesday 13th of August 2019 07:11:09 AM
Old 08-13-2019
Probably a daft question, but why can you not use cron? It seems an odd enforcement. If you are writing the code, then you probably have access to do all sorts of nasty stuff anyway. I would not think that a scheduled job is necessarily any more dangerous. The schedules would need to be preserved or shared if you have clustered servers or you migrate to a new server. There may be restrictions that are in place to avoid everybody scheduling loads of things and clogging the machine up and there needs to be some control. Assuming that this job that will do a thing in general rather than for you personally, then maybe a service account would be more suitable (a non-personal account that you/team can sudo to) which could be given access to use cron.

Is there a good reason for the rule? Personally I have not restricted anyone because of one from these:
  • They cannot get to the command line (business users)
  • They know what they are doing (application developers or support staff)
  • If they get it wrong, it's only what they could do anyway.......

It's important that jobs run as a person don't become critical to production running, I agree, but that's a cultural thing too. I've had much experience where a savy person has set something up themselves and then they get their PC replaced and it's all lost or credentials to a database change or are restricted and suddenly their entirely unsupported report stops working. It's worse when they leave and nobody knows wheat was done, what it did or anything except "Bob used to do something each month"


Can you say why you are not permitted to use a scheduler? Anything else is either a bad solution calling at repeatedly (probably also restricted) or requires you to have code running all the time all over the place which is exposed to failure and is unlikely to get restarted on boot until you restart it.



Thanks, in advance,
Robin
 

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LEARN ABOUT REDHAT

crond

CRON(8) 						      System Manager's Manual							   CRON(8)

NAME

       cron - daemon to execute scheduled commands (Vixie Cron)

SYNOPSIS

       cron

DESCRIPTION

       Cron should be started from /etc/rc or /etc/rc.local.  It will return immediately, so you don't need to start it with '&'.

       Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory.  Cron
       also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see  crontab(5)).	Cron  then
       wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute.  When execut-
       ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab,	if
       such exists).

       Additionally,  cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
       cron will then examine the modtime on all crontabs and reload those which have changed.	Thus cron need not be restarted whenever a crontab
       file is modified.  Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.

SEE ALSO

       crontab(1), crontab(5)

AUTHOR

       Paul Vixie <paul@vix.com>

4th Berkeley Distribution					 20 December 1993							   CRON(8)
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