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First, choose the right installation for your distribution or OS:

Configuration Quick Start

Configure Your Database

OpenNMS needs to be able to connect to PostgreSQL as the "postgres" user (by default) over a TCP/IP connection.

RedHat-based systems
/etc/init.d/postgresql start
/sbin/service postgresql start
pg_hba.conf and postgresql.conf are in /var/lib/pgsql/data
Debian-based systems
/etc/init.d/postgresql-X.X start
pg_hba.conf and postgresql.conf are in /etc/postgresql/X.X/main
Mac OS X (Fink)
/sw/bin/pgsql.sh start

Edit pg_hba.conf to Allow postgres to Authenticate

To allow the "postgres" user to connect, you will need to edit your database's pg_hba.conf file, which is usually created on installation or the first startup of PostgreSQL, depending on your distribution: By default, it will have something like this at the bottom:

 local   all         all                               ident sameuser
 host    all         all          ident sameuser
 host    all         all         ::1/128               ident sameuser

You will need to change "ident sameuser" to "trust":

 local   all         all                               trust
 host    all         all          trust
 host    all         all         ::1/128               trust

Edit postgresql.conf to Allow TCP/IP Connections

You may also need to change the postgresql.conf to allow TCP/IP connections, if it cannot do so already. On older PostgreSQL versions, this is enabled with the flag:

 tcpip_socket = true

On newer PostgreSQL versions, this is enabled with:

 # you can use "*" to listen on all addresses
 listen_addresses = 'localhost'

Also be sure that the max # of connections is configured to > than c3p0.maxPoolSize in $OPENNMS_HOME/etc/c3p0.properties (50 by default) +10.

 max_connections = 60

(Note: this may cause you to do some kernel tuning for max shared memory in the kernel (shmmax))

Restart the Database

Once you've made these changes, you need to restart your database.

Create the opennms Database

If not done, use "sudo -u postgres createdb -U postgres -E UNICODE opennms" to create the database in postgres.

Insert the IPLIKE Stored Procedure in the Database

If this is your first time installing OpenNMS or iplike, you should make sure that iplike is configured in your database. First you need to install the iplike package from OpenNMS package repositories.

For RPM-based distributions using YUM:

 yum install iplike

For DEB-based distributions using APT (use suffix pgsql74, pgsql81, pgsql82, or pgsql83 according to the version of PostgreSQL on your system):

 apt-get --reinstall install iplike-pgsql84

If the OpenNMS database is already configured, you are good to go. If not, you have to issue manually:


Tell OpenNMS Where to Find Java

OpenNMS needs to know where to find Java (Java 5 and Java 6 are both supported) to be able to start up. To tell it how to do so, you run $OPENNMS_HOME/bin/runjava like so:

 $OPENNMS_HOME/bin/runjava -s

This will search $JAVA_HOME and other common locations for your JDK. If you wish to use a specific JDK, you can run it with the -S flag instead:

 $OPENNMS_HOME/bin/runjava -S /usr/java/jdk1.5.0_12/bin/java

Add the JAVA_HOME in /etc/default/opennms


Initialize OpenNMS and the Database

Next, you need to run the OpenNMS installer, which will initialize the OpenNMS database, and do some other basic setup. Upon upgrade, you should run this command again to make sure your database schema and other things required at startup are up-to-date.

In most cases, you can just run:

 $OPENNMS_HOME/bin/install -dis

Sometimes you may need to tell OpenNMS where to find libjicmp.so; in that case, you can use the -l option (OpenNMS 1.3.5 and higher):

 # i386 example
 $OPENNMS_HOME/bin/install -dis -l /usr/lib/jni:/usr/lib
 # x86_64 example
 $OPENNMS_HOME/bin/install -dis -l /usr/lib64/jni:/usr/lib64

If you have an error durring the install process about language "plpgsql" does not exist, you can try :

createlang -U postgres plpgsql opennms

Start OpenNMS

You should have a basic OpenNMS installation ready now, so start it up:

 sudo /etc/init.d/opennms start

As of OpenNMS 1.3.7, by default, the web UI will come up using the embedded Jetty servlet container, on port 8980. Open your browser and point it at:


the user name and password are both "admin" to start.

Discover Your Network

Finding Hosts

First, OpenNMS needs to know which devices (or, "nodes") you want it to discover. To discover nodes, OpenNMS does a ping sweep on IP address ranges that you configure it to discover. If an IP address that OpenNMS is not already managing responds to a discovery ping, then OpenNMS will begin scanning that IP address for services, create a new node in its database, and begin monitoring the node's interfaces and services. A new install of OpenNMS will not perform any discovery until you add one or more address ranges to the discovery configuration. You do this by logging into the web UI as the admin user and navigating to the Admin menu and then clicking on 'Configure Discovery' under the Operations section.

In the Include Ranges section of the Home / Admin / Discovery / Modify Configuration page, click on the 'Add New' button. In the window that pops up, enter the beginning and ending IP addresses for the range that you wish to include for discovery. The default values for Retries and Timeout are usually appropriate. Click the 'Add' button, and the popup window will close and the new range will show up in the Include Ranges section. Click the 'Save and Restart Discovery' button to apply your changes. Discovery of the newly added range will begin within a few seconds; the ping requests and service scans are spread out over time to avoid flooding your network, so it will take some time for all nodes in your newly added range to be scanned and discovered.

For more detailed information on discovery configuration, including how to add IP addresses manually to the discovery configuration file, see Discovery.

Get Notifications When Problems Occur

To get started, we need to configure the main admin user to have a valid e-mail address.

  1. Log in as admin to the web UI
  2. Go to Admin in the menu bar
  3. Under the Operations section, set the Notification Status radio button to On and click the Update button
  4. Under the OpenNMS System section, go to Configure Users, Groups and Roles and then Configure Users
  5. click the icon under "Modify" for the admin user
  6. set the Email address, and click the Finish button

This should get OpenNMS configured to send the default notifications to the administrator e-mail address.

Notifications are extremely flexible and can be configured to do complex escalations, scheduled outages, and user management. Detailed instructions are available in the Notification Configuration How-To.