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'''SIM is a system and services monitor for `SysVinit` systems'''.
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fedora@fedora ~/sim-3.0> cat README
NOTE: This document is not complete and some paragraphs may be incomplete
SIM (System Integrity Monitor) version 3.0 [email@example.com]
Copyright (C) 1999-2005, R-fx Networks <firstname.lastname@example.org>
Copyright (C) 2005, Ryan MacDonald <email@example.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
1 ................ Introduction
1.1 .............. Features
2 ................ Setup
2.1 ............. Usage
3 ................ Extended Configuration
3.1 ............. Internal Functions
4 ................ License
5 ................ Support & Feedback
SIM is a system and services monitor for `SysVinit` systems. It is designed to
be intuitive and modular in nature, and to provide a clean and informative
- Preconfigured monitoring of 25+ common services
- Preconfigured monitoring of 3 system facilities [load, disk space, network]
- Auto restart ability for downed services
- Checks against network sockets & process list to ensure services are online
- URL Aware monitoring for web based services
- Informative command line status display
- Event tracking and alert system with detailed log output
- Simple & Informative installation script
- Documented internal functions for expansion of modules
Fetch the latest version of sim3 from the sim home page at:
Current snapshot always available from below link:
Then simply extract the tar.gz archive as appropriate, ideally non-root user:
$ tar xvfz sim-current.tar.gz
$ cd sim-3.0/
From this point once you have changed directory into the install package, the
'setup' or 'install.sh' script can be run. The different file names have no
distinction, 'setup' is a symlink of 'install.sh' ('setup' remains in place for
sim -u compat from 2.5.x vers).
-q Quiet install
In order to use any of the above options you will now be required to have root
access; su to root or similar to gain a root shell. Then execute an appropriate
# ./setup -i
Base path: /usr/local/sim/
Configuration file: /usr/local/sim/config/conf.sim
Configuration symlink: /etc/conf.sim
Module control file: /usr/local/sim/config/mods.control
Module control symlink: /etc/sim.mods
Executable symlink: /usr/local/sbin/sim
Once sim3 has installed you will then be prompted with summary of path
locations; you should modify the conf.sim and mods.control (/etc/sim.mods)
files to your desired preferences.
Then execute the following command to add the sim3 cronjob:
# sim -j on
If you have or had a version previous to sim3 installed, you will be prompted
to remove it cronjob from /etc/crontab file before continuing. The new sim3
places cronjob within the /etc/cron.d/sim folder.
The usage of sim3 is very much like pervious versions and if you have not
used sim before then you will still find it quite straight forward.
The first task is to configure the sim3 main configuration file located at:
You should edit your email address into appropriate alert option in conf.sim,
as well as configure any other options for advanced modules such as disk
space and load modules.
Then it is required to configure module usage directly in the file located at:
This file is very easy to modify, simply go through it and set On or Off the
respective modules you would like to use, obviously it would be a bad idea to
enable modules that do not apply to your current environment.
There-after executing the 'sim' command with no options will result in a
default -help being printed to the screen; displaying all accepted options.
usage /usr/local/sbin/sim [OPTION]
-s, --status Standard operation; display status to stdout
-q, --quiet Standard operation; status supressed
-l, --log Display log file [sim_log]
-j, --cron [on|off] Toggle on or off cronjob
-c, --clear Clear stat files; reset events
Using the 'sim -s' option will display a summary status of all services and any
related events, note that this is not a passive status output and check/restart
operations will be performed if a service is offline while running the '-s'
option. If you would like passive status you should use the -l option to view
the sim log file.
The other options, -j or --cron option is used to toggle on or off the sim cron
job, the -c or --clear option is used to reset all event counts, and the -q or
--quiet option is to run standard checks but with no status output printed to
There is a sim3 maintained log file that tracks status of all modules and
internal sim3 operations, additionally there is a service init log that tracks
the output from all init commands executed; these logs are located at:
/usr/local/sim/logs/sim_log OR /var/log/sim_log
3) Extended Configuration
All sim3 modules are stored under a central path located at:
All advanced options such as socket and process check vars, urlaware checks
and any conditional checks are all contained within service modules. For
example if you run sshd on port 2828 you would need to edit the sshd.mod module
as so to prevent sim3 from restarting it in a loop. To do this you would open
the file /usr/local/sim/modules/init/sshd.mod and edit the socket_port var.
These modules are all function based with some simple standards in place to
ensure module sanity.
a - all modules must declare the module version in the first line of the module,
currently the only accepted string is as follows:
b - all modules must declare a default state on the second line of the module,
currently the only accepted string is as follows:
c - all modules must end with the file name .mod
So in recap all sim3 modules must contain as follows in the first 2 lines:
There-after one may add the module to the module insertion control list:
/usr/local/sim/config/mods.control, in the format of:
# [sys/init].module [on/off]
3.1) Internal Functions
There is a number of functions that can be modified, examined or used as-is
to develop additional sim3 modules to meet any needs you should have.
These functions are not the most logical at this point and some have weird
logic to there variable names and input styles but nonetheless they serve there
purpose and are by far an improvement from the old sim2 which was much slower
and allot less refined in a modular capacity.
In time we will further refine the sim3 functions, there naming and the usage
logic there-in. Should you wish to become familiar with any sim3 functions
you would be well advised to explore the following files:
SIM3 is developed and supported on a volunteer basis by Ryan MacDonald
SIM3 (System Integrity Monitor version 3) is distributed under the GNU General
Public License (GPL) without restrictions on usage or redistribution. The SIM3
copyright statement, and GNU GPL, "COPYING.GPL" are included in the top-level
directory of the distribution. Credit must be given for derivative works as
required under GNU GPL.
5) Support & Feedback
If you require assistance with SIM or would like to provide feedback please
send an email to: <firstname.lastname@example.org> and/or <email@example.com>
Or visit: http://www.r-fx.org/sim.php
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