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Full Discussion: script to remotely start several applications and instances
Top Forums UNIX for Advanced & Expert Users script to remotely start several applications and instances Post 302492284 by aix-guy on Sunday 30th of January 2011 10:44:15 PM
Old 01-30-2011
Yes it can be done and be secure. I done a couple and basically here was my approach.
1. Create the central users script. If needed the make menu driven. We created a base user not a super user for this account. In out case the home dir is a NFS mount to all the servers. So a script to send commands to another server wasn't needed. A NAS mounted device would work for this also.
2. So since in most cases root needs to be the user to do the work.
I have a local root script that is looping and looking for a file to show up in a defined directory on the global mount. Now this is were it depends on what you are trying to do on the server. So the dropped file
could contain the objective to be bounce. So if you would bounce oracle and refresh sendmail lets say. the file would be named <server name>_???.trg and contain oracle|sendmail. The local script would see the file then consume the file and create a results file.
3. the master script would look for the files to be consumed and the results being created.

There are a lot more steps to all this...

Security wise - since the user login into the server as the service user. They don't know or have ability to be root. That is all controlled by the scripts and your programs. And the service account when it logs in will only run the menu to do your application. And you will also do the trap command in the login control so they can't ctl c or anything out to a shell.

This may sound worse than what the work really is. You could have the whole thing done in a day or so.
 

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LEARN ABOUT CENTOS

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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