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Full Discussion: Cronjob Activation
Top Forums Shell Programming and Scripting Cronjob Activation Post 302163981 by Smiling Dragon on Sunday 3rd of February 2008 10:45:14 PM
Old 02-03-2008
Java
Quote:
Originally Posted by Raynon
Hi All,

I have set a cronjob to run a script at a frequency of 10 mins.
However, if the script takes more than 10 mins to complete, how will the cronjob behaves?
1) Does it ignore the current process and restart the whole process again?
2) Or does it stop to trigger the script again unless previous process has been completed?
Depends on your cron implementation but generally it will run another copy of the script 10 mins after the first one is started - regardless of how long the first run takes.

Solutions:
  • Make your script reentrant - ie write it such that it running multiple times at once isn't a problem.
  • Make your script aware of how many times it's currently running - ie create a lock file when it starts up and check for this every time you start.
  • Don't use cron, have the script run continuously and manage it's own scheduling - ie sleep 600
  • Don't use cron, get a better scheduler - depending on your enviornment, this could be something like anacron or control-m.
 

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LEARN ABOUT HPUX

dh_systemd_start

DH_SYSTEMD_START(1)						     Debhelper						       DH_SYSTEMD_START(1)

NAME

       dh_systemd_start - start/stop/restart systemd unit files

SYNOPSIS

       dh_systemd_start [debhelperoptions] [--restart-after-upgrade] [--no-stop-on-upgrade] [unitfile...]

DESCRIPTION

       dh_systemd_start is a debhelper program that is responsible for starting/stopping or restarting systemd unit files in case no corresponding
       sysv init script is available.

       As with dh_installinit, the unit file is stopped before upgrades and started afterwards (unless --restart-after-upgrade is specified, in
       which case it will only be restarted after the upgrade).  This logic is not used when there is a corresponding SysV init script because
       invoke-rc.d performs the stop/start/restart in that case.

OPTIONS

       --restart-after-upgrade
	   Do not stop the unit file until after the package upgrade has been completed.  This is the default behaviour in compat 10.

	   In earlier compat levels the default was to stop the unit file in the prerm, and start it again in the postinst.

	   This can be useful for daemons that should not have a possibly long downtime during upgrade. But you should make sure that the daemon
	   will not get confused by the package being upgraded while it's running before using this option.

       --no-restart-after-upgrade
	   Undo a previous --restart-after-upgrade (or the default of compat 10).  If no other options are given, this will cause the service to
	   be stopped in the prerm script and started again in the postinst script.

       -r, --no-stop-on-upgrade, --no-restart-on-upgrade
	   Do not stop service on upgrade.

       --no-start
	   Do not start the unit file after upgrades and after initial installation (the latter is only relevant for services without a
	   corresponding init script).

NOTES

       Note that this command is not idempotent. dh_prep(1) should be called between invocations of this command (with the same arguments).
       Otherwise, it may cause multiple instances of the same text to be added to maintainer scripts.

       Note that dh_systemd_start should be run after dh_installinit so that it can detect corresponding SysV init scripts. The default sequence
       in dh does the right thing, this note is only relevant when you are calling dh_systemd_start manually.

SEE ALSO

       debhelper(7)

AUTHORS

       pkg-systemd-maintainers@lists.alioth.debian.org

11.1.6ubuntu2							    2018-05-10						       DH_SYSTEMD_START(1)
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