Renaming directories stops resumption of write process Post: 302964456

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Top Forums Shell Programming and Scripting Renaming directories stops resumption of write process Post 302964456 by Don Cragun on Thursday 14th of January 2016 08:36:00 PM

01-14-2016

Registered User

Quote:

Originally Posted by SkySmart

i presumed it had to be related to inodes.

and no, the files in /var/tmp/EXAMPLEA-BKUP do not continue growing when they're renamed. I think what I can try doing next time is:

1. Make sure the cron job is commented out or any application writing to the directories are shut down
2. And, as suggested by hicksd8, i can also use mv, instead of cp

Note that the following sequence of operations:

Code:

mv /var/tmp/EXAMPLEA /var/tmp/EXAMPLEA-BKUP
mkdir /var/tmp/EXAMPLEA
mv /var/tmp/EXAMPLEA-BKUP/* /var/tmp/EXAMPLEA

leaves you with an empty /var/tmp/EXAMPLEA-BKUP directory, and creates a period of time where files being written into /var/tmp/EXAMPLEA will be destroyed by replacing them with files being copied or moved from /var/tmp/EXAMPLEA-BKUP to /var/tmp/EXAMPLEA.

If you want to make a backup of files currently in a directory to a backup directory, it usually makes a lot more sense to do something more like:

Code:

rm -rf /var/tmp/EXAMPLEA-BKUP
mkdir /var/tmp/EXAMPLEA-BKUP
cp /var/tmp/EXAMPLEA/* /var/tmp/EXAMPLEA-BKUP

which never leaves /var/tmp/EXAMPLEA non-existent and never destroys any files that exist in that directory at the time the backup is created.

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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)