A plugin (monitoring-plugin, not nagios-plugin, see also http://is.gd/PP1330) which checks various parameters of Microsoft SQL database servers.
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check_mssql_health Nagios Plugin README

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This plugin is used to monitor a variety of MS SQL Server database metrics.

  • For instructions on installing this plugin for use with Nagios, see below. In addition, generic instructions for the GNU toolchain can be found in the INSTALL file.

  • For major changes between releases, read the CHANGES file.

  • For information on detailed changes that have been made, read the Changelog file.

  • This plugin is self documenting. All plugins that comply with the basic guidelines for development will provide detailed help when invoked with the '-h' or '--help' options.

You can check for the latest plugin at: http://www.consol.com/opensource/nagios/check-mssql-health

The documentation in this README covers only the most common features. To view the full documentation and examples, go to http://www.consol.com/opensource/nagios/check-mssql-health or http://www.consol.de/opensource/nagios/check-mssql-health

Send mail to gerhard.lausser@consol.de for assistance. Please include the OS type/version and the Perl DBI/DBD version that you are using. Also, run the plugin with the '-vvv' option and provide the resulting version information. Of course, there may be additional diagnostic information required as well. Use good judgment.

For patch submissions and bug reports, please send me a mail. You can also find me at http://www.nagios-portal.de


You need to install the Perl module DBD::Sybase first. It is very important to set the protocol version in /etc/freetds.conf to 8.0 Otherwise your database password will be visible on the network.

[global] # TDS protocol version tds version = 8.0

How to "compile" the check_mssql_health script.

  1. Run the configure script to initialize variables and create a Makefile, etc.

    ./configure --prefix=BASEDIRECTORY --with-nagios-user=SOMEUSER --with-nagios-group=SOMEGROUP --with-perl=PATH_TO_PERL --with-statefiles-dir=STATE_PATH

    a) Replace BASEDIRECTORY with the path of the directory under which Nagios is installed (default is '/usr/local/nagios') b) Replace SOMEUSER with the name of a user on your system that will be assigned permissions to the installed plugins (default is 'nagios') c) Replace SOMEGRP with the name of a group on your system that will be assigned permissions to the installed plugins (default is 'nagios') d) Replace PATH_TO_PERL with the path where a perl binary can be found. Besides the system wide perl you might have installed a private perl just for the nagios plugins (default is the perl in your path). e) Replace STATE_PATH with the directory where you want the script to write state files which transport information from one run to the next. (default is /tmp)

    Simply running ./configure will be sufficient to create a check_mssql_health script which you can customize later.

  2. "Compile" the plugin with the following command:


    This will produce a "check_mssql_health" script. You will also find a "check_mssql_health.pl" which you better ignore. It is the base for the compilation filled with placeholders. These will be replaced during the make process.

  3. Install the compiled plugin script with the following command:

    make install

    The installation procedure will attempt to place the plugin in a 'libexec/' subdirectory in the base directory you specified with the --prefix argument to the configure script.

  4. Verify that your configuration files for Nagios contains the correct paths to the new plugin.

Command line parameters

--hostname= This is the hostname or the ip-address.

--port= This is the port where an instance listens. Default: 1433

--server= This can be used instead of a hostname/port combination. The servername given here is used for a lookup in /etc/freetds.conf

--user= This is the user which reads the system tables.

--password= This is the user's password.

--mode= This parameter tells the plugin what it should check. The list of known modes may grow frequently. Please look at http://www.consol.com/opensource/nagios/check-mssql-health for a list of features.

--database= Database-related modes check all databases in one run by default. If only a single database should be checked, use this parameter.

--warning= If the metric is out of this range, the plugin returns a warning.

--critical= If the metric is out of this range, the plugin returns a critical.


You can call the plugin with "--hostname [--port ]" This bypasses the freetds.conf file and directly connects you to whatever is listening on port 1433 or This will surely be the default instance. If you have different (named) instances listening on the same port, you need to edit /etc/freetds.conf

[dbsrv1instance01] host = port = 1433 instance = instance01

[dbsrv1instance02] host = port = 1433 instance = instance02


Then you call the plugin with "--server dbsrv1instance02" for example.

Testing the connection

use DBI; use strict;

my $username = "xxxxx"; my $password = "xxxxx"; my $dsn = "DBI:Sybase:;host=;port=1433"; #my $dsn = "DBI:Sybase:;server=dbsrv_in_freetds_conf"; if (my $dbh = DBI->connect( $dsn, $username, $password, { RaiseError => 1, AutoCommit => 0, PrintError => 1 })) { printf "connection succeeded\n"; } else { printf "connection failed\n"; }

In Sybase, login as sa and switch on auditing: sp_configure "log audit logon success", 1 sp_configure "log audit logon failure", 1 go shutdown go

Then startup again startserver -f /opt/sybase/ASE-15_0/install/RUN_backup_server -f /opt/sybase/ASE-15_0/install/RUN_ase_server -f /opt/sybase/ASE-15_0/install/RUN_monitor_server

That's it. If you have any problems or questions, feel free to send mail to gerhard.lausser@consol.de