NSTI performs well with and is designed to run on CentOS, RHEL and most Linux distributions that utilize the yum package manager. It is important to note that NSTI was designed to be installed on a clean server with no other software installed.


If you install NSTI on a server that has Nagios XI or Nagios Core installed on it there will be further configuration involved with snmp and snmptt based on what was used to configure the Nagios trap setup.


NSTI is designed to work under any environment, but the installer script will only work with the yum package manager until cross platform support is added in another version.

Installing NSTI Using Tarball

Here is the Official Nagios NSTI Tarball page to track releases:

If you want to install NSTI using a tarball use the URL below

From the command line use wget to install

cd /tmp
wget -O nsti-3.0.2.tar.gz
tar zxf nsti-3.0.2.tar.gz
cd nsti-3.0.2/

Now NSTI should be installed, to verify navigate to this address:

http://<NSTI Server IP>/nsti


If the previous install options happen to fail–the best way to troubleshoot is to consult the install log that is generated in the install directory. This will show what the install did and where it failed.

NSTI Dependency Notes

If you wish to install NSTI manually the following is a list of components that you will need to run NSTI:

  • mysql
  • mysql-devel
  • mysql-server
  • httpd
  • gcc
  • wget
  • make
  • tar
  • mod_wsgi
  • snmptt
  • net-snmp
  • python

In addition to the above, there are python modules that are required. These modules are also included in nsti/install/requirements.txt. These are easily managed if you install using pip:

curl | python

Possible NSTI Install Gotcha’s

If any of the packages failed to install you will see error outputs such as the following possible errors:


‘Cannot continue install until all of these prereqs are met.’

‘mod_wsgi is not installed in Apache. Please use your package manager to install it.’

‘No user nagios. Add a user for nagios and make sure it is in the nagcmd group.’
‘Apache must also be in nagcmd.’

Flask and Storm


Both of these are inside the requirements.txt that the install script refers to so they should both be installed at this point, but just in case we will go over them and how to install them if, for some reason, they are missing.

NSTI uses Flask as a lightweight web applicatin framework and uses Werkzeug and Jinja2 for templating engines. Flask is a great microframework that allows extentions to be added granting it access to form validation and database abstraction. You will need Flask so install it using pip or easy_install.

Storm is a Python programming library for Object-Relational Mapping (ORM) between one or more SQL databases and Python objects. This allows NSTI to make queries and demands of the datasbase to be able to populate, collect and filter the traps in the database, but also how the traps are displayed in the UI.

MySQL Configuration


If the installer ran successfully the first time the following section does not apply. It is only relevent if any errors occured or if you are installing NSTI manually.

To run NSTI correctly it is important that you have your mysql set up correctly so NSTI can read and write data from the database. The most common problem with NSTI not communicating properly with your mysql database is the root user password settings. It is recommended that you set the password if the install script failed to do so.

The file is located here:


This is where you will set your database type, host, name, user and password. To test if you succesfully configured your database use the in the nsti directory. It will output any connection errors and you will be able to adjust settings accordingly.

Another point to be made is that you will need to verify that the database NSTI is writing to was created. If it wasn’t you will recieve similar errors to the following:


ERROR 1049 (42000): Unknown database ‘snmptt’

Unable to add database schema. Does the snmptt exist?

This means that the installer did not create the database so you will need to run the installer again or manually add the database that will be written to, create the root user and use the password ‘password’ to make sure it is working. The default database is Snmptt.


After you verify everything is working with the database it is recommended that you change your password and update it in the configuration files.

Installing NSTI Using Git Clone (Developers)

This section is for developers who would like to clone the NSTI repository to get a look at the front and back end firsthand. First you will clone the Git repo to retrieve NSTI.

To clone a repository with git run the following command in the directory you want nsti to be copied to:

cd /tmp
git clone
cd nsti/

Now NSTI should be installed, to verify navigate to this address:

http://<NSTI Server IP>/nsti

While developing use the to launch the server and get apache request output from the commandline and access NSTI as shown below (Note: is used to launch the nsti program for debugging and development- if you want to access the nsti page as normal just use the <IP>/nsti URL):

cd /tmp/nsti/


http://<NSTI Server IP>:8080/nsti