Script that will look the same as Cron Post: 303037767

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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

08-13-2019

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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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cron

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

NAME

       cron - The system clock daemon

SYNOPSIS

       /usr/sbin/cron

DESCRIPTION

       The cron daemon runs shell commands at specified dates and times.  Commands that are to run according to a regular or periodic schedule are
       found within the crontab files.	Commands that are to run once only are found within the at files.  You submit crontab and at file  entries
       by  using  the  crontab	and  at  commands.  Because the cron process exits only when killed or when the system stops, only one cron daemon
       should exist on the system at any given time.  Normally, you start the cron daemon from within a run command file.

       During process initialization and when cron detects a change, it examines the crontab and at files.  This strategy reduces the overhead	of
       checking  for  new  or  changed files at regularly scheduled intervals.	The cron command creates a log of its activities.  The cron daemon
       must be started from the system startup scripts because it must begin execution without a login user ID set.  The cron daemon  starts  each
       job  with the following process attributes stored with the job by the invoking process: Login user ID Effective and real user IDs Effective
       and real group IDs Supplementary groups

       It also establishes the following attributes from the authentication profile of the account associated with the login user ID of the invok-
       ing process: Audit control and disposition masks Kernel authorizations

DIAGNOSTICS

       The at and batch programs will refuse to accept jobs submitted from processes whose login user ID is different from the real user ID.

FILES

       Specifies the command path.  Main cron directory Directory containing the crontab files.  List of allowed users.  List of denied users His-
       tory information for cron Queue description file for at, batch, and cron

RELATED INFORMATION

       Commands:  at(1), crontab(1), rc0(8), rc2(8), rc3(8)

       Files: queuedefs(4) delim off

																	   cron(8)

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