## 1. Installation Overview

The OpenNMS platform can be installed in several ways. This guide describes the installation of the platform on Red Hat Enterprise Linux (RHEL)-based, Debian-based and Microsoft Windows operating systems. The following abbreviations will be used to refer to the following operating systems:

• RHEL: Red Hat Enterprise Linux 6 or higher, CentOS 6 or higher, Fedora 20 or higher

• Debian: Debian 7 or higher, Ubuntu 14.04 or higher

• Microsoft Windows: Windows 8.1, Windows Server 2012, Windows 10

Installable, precompiled software packages are provided through RHEL Yum and Debian APT repository servers and from the OpenNMS Sourceforge project page. Installing OpenNMS requires the following prerequisites:

• A configured Yum or APT Package Repository for your platform (Linux only)

• Oracle Java SE Development Kit 8 environment

• PostgreSQL database version 9.1 or higher

• A time-series database engine to persist long-term performance data:

• JRobin: The default choice. JRobin is included inside OpenNMS and doesn’t require additional software to be installed.

• RRDtool: A higher performance, file-based database.

• Newts: The highest performance solution. Newts uses an Apache Cassandra database for clustered scalability.

 OpenJDK 8 can be used, but for production and critical environments Oracle Java SE Development Kit 8 is recommended.
 ${OPENNMS_HOME} will be used to refer to the path where OpenNMS is installed. It is different depending on your platform: RHEL: /opt/opennms Debian: /usr/share/opennms Microsoft Windows: C:\Program Files\opennms With the opennms meta package all dependencies needed for the components mentioned above are maintained. The following sections describe how to install OpenNMS on a single system. Dependencies for Java and the PostgreSQL database are maintained with the opennms meta installation package. ## 2. Yum/APT Package Repositories Installation packages are available for different releases of OpenNMS. You need to choose which release you would like to run and then configure your package repository to point to that release. Configuring a package repository will enable you to install and update the software by using standard Linux software update tools like yum and apt. The following package repositories are available: Table 1. OpenNMS package repositories Release Description stable Latest stable release. This version is recommended for all users. testing Release candidate for the next stable release. snapshot Latest successful development build, the "nightly" build. branches/${BRANCH-NAME}

Install from a specific branch name for testing a specific feature that is under development. Available branches can be found in http://yum.opennms.org/branches/ or http://debian.opennms.org/dists/branches/.

To install a different release the repository files have to be installed and manually modified.

### 2.1. RHEL Yum Repository

Install the configuration for a package repository
rpm -Uvh http://yum.opennms.org/repofiles/opennms-repo-${RELEASE}-rhel7.noarch.rpm (1) rpm --import http://yum.opennms.org/OPENNMS-GPG-KEY  1 Replace ${RELEASE} with a release name like stable (recommended), testing, or snapshot.

### 2.2. Debian APT Repository

Create a new apt source file (eg: /etc/apt/sources.list.d/opennms.list), and add the following 2 lines:

Package repository configuration for Debian-based systems
deb http://debian.opennms.org ${RELEASE} main (1) deb-src http://debian.opennms.org${RELEASE} main (1)
 1 Replace ${RELEASE} with a release name like stable (recommended), testing, or snapshot. Import the packages' authentication key with the following command: GPG key import for Debian-based systems wget -O - http://debian.opennms.org/OPENNMS-GPG-KEY | apt-key add - ## 3. OpenNMS After configuring the package repository, you are ready to install the OpenNMS packages, configure the database, and initialize the OpenNMS platform. ### 3.1. RHEL This section describes how to install the OpenNMS platform on CentOS 7.1. The setup process is described in the following steps: 1. Installation of the opennms meta package which handles all dependencies 2. Initialize PostgreSQL database and configure access 3. Initialize OpenNMS and first start of the application #### 3.1.1. Install OpenNMS Installation of the full application with all dependencies like PostgreSQL and Java yum -y install opennms The following packages will be automatically installed: • opennms: The platform meta package which handles all dependencies from OpenNMS repository. • jicmp6 and jicmp: Java bridge to allow sending ICMP messages from OpenNMS repository. • opennms-core: OpenNMS core services, e.g. Provisiond, Pollerd and Collectd from OpenNMS repository. • opennms-webapp-jetty: OpenNMS web application from OpenNMS repository • jdk1.8: Oracle Java SE Development Kit 8 environment from OpenNMS respository • postgresql: PostgreSQL database server from distribution repository • postgresql-libs: PostgreSQL database from distribution repository  Verify the version of the OpenNMS packages that was installed with yum info opennms. With the successful installed packages the OpenNMS platform is installed in the following directory structure: [root@localhost /opt/opennms]# tree -L 2 . └── opennms ├── bin ├── contrib ├── data ├── deploy ├── etc ├── jetty-webapps ├── lib ├── logs -> /var/log/opennms ├── share -> /var/opennms └── system #### 3.1.2. Prepare PostgreSQL The CentOS package installs but doesn’t initialize the PostgreSQL database directory. Additionally OpenNMS requires authentication to access the database and are described in this section. Initialize the database directory with Initialization of the PostgreSQL database postgresql-setup initdb System startup configuration for PostgreSQL systemctl enable postgresql Startup PostgreSQL database systemctl start postgresql The next step is setting the postgres super user password and creating an opennms database user with password. Additionally it is required to configure the authentication method to allow authentication from the local network. Accounting and database management for OpenNMS su - postgres createuser -P opennms createdb -O opennms opennms exit Set password for Postgres super user su - postgres psql -c "ALTER USER postgres WITH PASSWORD 'YOUR-POSTGRES-PASSWORD';" exit  The super user is required to be able to initialize and change the database schema for installation and updates. To allow OpenNMS access to the database over the local network PostgreSQL has to be configured. vi /var/lib/pgsql/data/pg_hba.conf Configuration of network access for PostgreSQL host all all 127.0.0.1/32 md5(1) host all all ::1/128 md5(1)  1 Change method from ident to md5 for IPv4 and IPv6 on localhost. Apply configuration changes for PostgreSQL systemctl reload postgresql In the next step configure the OpenNMS database configuration. vi${OPENNMS_HOME}/etc/opennms-datasources.xml
Configuration for database authentication in OpenNMS
<jdbc-data-source name="opennms"
database-name="opennms"
class-name="org.postgresql.Driver"
url="jdbc:postgresql://localhost:5432/opennms"

database-name="template1"
class-name="org.postgresql.Driver"
url="jdbc:postgresql://localhost:5432/template1"
user-name="postgres"(3)
password="** YOUR-POSTGRES-PASSWORD **" />(4)

#### 3.1.3. Initialize OpenNMS

OpenNMS is now configured to access the database. It is required to set the Java environment running OpenNMS and initialize the database schema.

Configuration of Java environment for OpenNMS
${OPENNMS_HOME}/bin/runjava -s Initialization of database and system libraries ${OPENNMS_HOME}/bin/install -dis
System startup configuration for OpenNMS
systemctl enable opennms
Startup OpenNMS
systemctl start opennms

After starting OpenNMS the web application can be accessed on http://<ip-or-fqdn-of-your-server>:8980/opennms. The default login user is admin and the password is initialized to admin.

### 3.2. Debian

 This guide does not apply to OpenNMS Meridian, which can be installed only on Red Hat Enterprise Linux or CentOS systems.

This section describes how to install the OpenNMS platform on Ubuntu 14.04 LTS. The setup process is described in the following steps:

1. Installation of the opennms meta package which handles all dependencies

2. Initialize PostgreSQL database and configure access

3. Initialize OpenNMS and first start of the application

#### 3.2.1. Install OpenNMS

Installation of the full application with all dependencies like PostgreSQL and Java
apt-get update
apt-get install -y opennms

The following packages will be automatically installed:

• opennms: The platform meta package which handles all dependencies from OpenNMS repository.

• jicmp6 and jicmp: Java bridge to allow sending ICMP messages from OpenNMS repository.

• opennms-core: OpenNMS core services, e.g. Provisiond, Pollerd and Collectd from OpenNMS repository.

• opennms-webapp-jetty: OpenNMS web application from OpenNMS repository

• jdk1.8: Oracle Java 8 environment from OpenNMS respository

• postgresql: PostgreSQL database server from distribution repository

• postgresql-libs: PostgreSQL database from distribution repository

 Verify the version of the OpenNMS packages that was installed with apt-cache show opennms.

With the successful installed packages the OpenNMS platform is installed in the following directory structure:

[root@localhost /usr/share/opennms]# tree -L 2
.
└── opennms
├── bin
├── data
├── deploy
├── etc -> /etc/opennms
├── instances
├── jetty-webapps
├── lib -> ../java/opennms
├── logs -> /var/log/opennms
├── share -> /var/lib/opennms
└── system

#### 3.2.2. Prepare PostgreSQL

The Debian package installs also PostgreSQL database and is already initialized and added in the runlevel configuration. It is only necessary to start the PostgreSQL database without a restart.

Startup PostgreSQL database
service postgresql start

The next step is creating an opennms database user with password and configure the authentication method.

Accounting and database management for OpenNMS
su - postgres
createuser -P opennms
createdb -O opennms opennms
exit
 It is not necessary to change the authentication method in pg_hba.conf, it is by default set to md5 for localhost connections.
Set password for Postgres super user
su - postgres
exit
 The super user is required to be able to initialize and change the database schema for installation and updates.
vi ${OPENNMS_HOME}/etc/opennms-datasources.xml Configuration for database authentication in OpenNMS <jdbc-data-source name="opennms" database-name="opennms" class-name="org.postgresql.Driver" url="jdbc:postgresql://localhost:5432/opennms" user-name="** YOUR-OPENNMS-USERNAME **"(1) password="** YOUR-OPENNMS-PASSWORD **" />(2) <jdbc-data-source name="opennms-admin" database-name="template1" class-name="org.postgresql.Driver" url="jdbc:postgresql://localhost:5432/template1" user-name="postgres"(3) password="** YOUR-POSTGRES-PASSWORD **" />(4)  1 Set the user name to access the OpenNMS database table 2 Set the password to access the OpenNMS database table 3 Set the postgres user for administrative access to PostgreSQL 4 Set the password for administrative access to PostgreSQL #### 3.2.3. Initialize OpenNMS OpenNMS is now configured to access the database. It is required to set the Java environment running OpenNMS and initialize the database schema. Configuration of Java environment for OpenNMS ${OPENNMS_HOME}/bin/runjava -s
Initialization of database and system libraries
${OPENNMS_HOME}/bin/install -dis  It is not necessary to add OpenNMS to the run level manually, it is automatically added after setup. Startup OpenNMS service opennms start After starting OpenNMS, the web application can be accessed on http://<ip-or-fqdn-of-your-server>:8980/opennms. The default login user is admin and the password is initialized to admin.  Change the default admin password to a secure password immediately. ### 3.3. Microsoft Windows  This guide does not apply to OpenNMS Meridian, which can be installed only on Red Hat Enterprise Linux or CentOS systems. OpenNMS is mostly developed on Unix/Linux based systems, nevertheless it is possible to install the platform on Microsoft Windows operating systems. To install the application a graphical installer is provided and can be used to install OpenNMS on Microsoft Windows. This section describes how to install the OpenNMS platform on Microsoft Windows 2012 Server.  The standalone installer for Microsoft Windows is only available for the most recent stable version of OpenNMS.  It is required to have Oracle JDK 8 installed. The JRE is NOT sufficient.  To edit OpenNMS configuration files on Microsoft Windows the tool Notepad++ can deal with the formatting of .property and .xml files. The setup process is described in the following steps: 1. Installation of PostgreSQL database service 2. Download and install the graphical OpenNMS installer 3. First start of the OpenNMS application #### 3.3.1. Install PostgreSQL PostgreSQL is available for Microsoft Windows and latest version can be downloaded from Download PostgreSQL page. Follow the on-screen instructions of the graphical installer.  The placeholder {PG-VERSION} represents the PostgreSQL version number. A version of 9.1+ is required for OpenNMS. The following information has to be provided: • Installation directory for PostgreSQL, e.g. C:\Program Files\PostgreSQL{PG-VERSION} • Password for the database superuser (postgres), this password will be used during the OpenNMS setup. • Port to listen for PostgreSQL connections, default is 5432 and can normally be used. • Locale for the database, keep [Default locale], if you change the locale, OpenNMS may not be able to initialize the database.  It is not required to install anything additional from the PostgreSQL Stack Builder.  The database data directory is automatically initialized during the setup and the postgresql-x64-{PG-VERSION} is already added as service and automatically started at system boot.  It is not necessary to change the authentication method in pg_hba.conf, it is by default set to md5 for localhost connections. #### 3.3.2. Install OpenNMS with GUI installer For Microsoft Windows environments download the standalone-opennms-installer-{ONMS-VERSION}.zip file from the OpenNMS SourceForge repository. Extract the downloaded ZIP file.  The {ONMS-VERSION} has to be replaced with the latest stable version. Start the graphical installer and follow the on screen instructions. The following information has to be provided: • Path to Oracle JDK, e.g. C:\Program Files\Java\jdk1.8.0_51 • Installation path for OpenNMS, e.g. C:\Program Files\OpenNMS • Select packages which has to be installed, the minimum default selection is Core and Docs • PostgreSQL Database connection • Host: Server with PostgreSQL running, e.g. localhost • Name: Database name for OpenNMS, e.g. opennms • Port: TCP port connecting to PostgreSQL server, e.g. 5432 • Username (administrative superuser): PostgreSQL superuser, e.g. postgres • Password (administrative superuser): Password given during PostgreSQL setup for the superuser • Username (runtime user for opennms): Username to connect to the OpenNMS database, e.g. opennms • Password (runtime user for opennms): Password to connect to the OpenNMS database, e.g. opennms • Configure a discovery range for an initial node discovery. If you don’t want any discovery set begin and end to the same unreachable address.  Choose secure passwords for all database users and don’t use the example passwords above in production.  There is currently an open issue in the installer NMS-7831. Username and password are not written to the opennms-datasources.xml file and has to be changed manually. The initialize of the database will fail with an authentication error. Configuration for database authentication in OpenNMS <jdbc-data-source name="opennms" database-name="opennms" class-name="org.postgresql.Driver" url="jdbc:postgresql://localhost:5432/opennms" user-name="** YOUR-OPENNMS-USERNAME **"(1) password="** YOUR-OPENNMS-PASSWORD **" />(2) <jdbc-data-source name="opennms-admin" database-name="template1" class-name="org.postgresql.Driver" url="jdbc:postgresql://localhost:5432/template1" user-name="postgres"(3) password="** YOUR-POSTGRES-PASSWORD **" />(4)  1 Set the user name to access the OpenNMS database table 2 Set the password to access the OpenNMS database table 3 Set the postgres user for administrative access to PostgreSQL 4 Set the password for administrative changes of the OpenNMS database table After setting the username and passwords in opennms-datasources.xml re-run the graphical installer and also initialize the database. OpenNMS can be started and stopped with the start.bat and stop.bat script located in %OPENNMS_HOME%\bin directory. After starting OpenNMS with the start.bat file the web application can be accessed on http://<ip-or-fqdn-of-your-server>:8980/opennms. The default login user is admin and the password is initialized to admin.  Change the default admin password to a secure password immediately.  The Wiki article Configuring OpenNMS as Windows Service describes how to create a Windows Service from the start.bat files. There is also a Java Wrapper which allows to install Java applications as Windows Service. ## 4. Oracle Java SE Development Kit 8 Installing the Oracle Java SE Development Kit 8 (JDK8) requires installation packages provided by Oracle or a 3rd-party maintainer for Debian-based Linux distributions. The following tools should be installed to follow this installation manual: • Download files and tools with wget and curl • Extract archives with tar • Text manipulation with sed • Editing text, e.g. vi, nano or joe • Internet access  By downloading the Oracle Java SE Development Kit 8 RPM installer, you will accept the license agreement from Oracle which can be found on the Java distribution web site. ### 4.1. RHEL This section describes how to install Oracle Java SE Development Kit 8 on a RPM-based system like Red Hat Enterprise Linux 7 or CentOS 7.1. Download Oracle JDK RPM wget --no-cookies \ --no-check-certificate \ --header \ "Cookie: oraclelicense=accept-securebackup-cookie" \ "http://download.oracle.com/otn-pub/java/jdk/8u45-b14/jdk-8u45-linux-x64.rpm" \ -O /tmp/jdk-8-linux-x64.rpm Install Oracle JDK RPM file yum install /tmp/jdk-8-linux-x64.rpm ### 4.2. Debian This section describes how to install Oracle Java SE Development Kit 8 on a Debian-based system like Debian 8 or Ubuntu 14.04 LTS. Add Java repository from webupd8 maintainer su - echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main" | tee /etc/apt/sources.list.d/webupd8team-java.list echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main" | tee -a /etc/apt/sources.list.d/webupd8team-java.list Add repository key server and update repository apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886 apt-get update Install Oracle Java SE Development Kit 8 apt-get install -y oracle-java8-installer ### 4.3. Microsoft Windows This section describes how to install Oracle Java SE Development Kit 8 on a system running the Microsoft Windows Server 2012 operating system. Download the Microsoft Windows Java SE Development Kit 8 installer with PowerShell or a browser cd C:\Users\Administrator\Downloads Invoke-WebRequest http://javadl.sun.com/webapps/download/AutoDL?BundleId=107944 -Outfile java8-installer.exe Start the java8-installer.exe from the command line or with Windows Explorer from the Administrator’s Download folder.  The setup requires administrative privileges. ### 4.4. Java Environment To locate the Java system files, applications typically use the $JAVA_HOME environment variable. The environment can be set for a specific user or globally for the whole system on boot time.

Example path to Java on RHEL, Debian and Microsoft Windows systems
• RHEL: /usr/java/jdk1.8.0_51

• Debian: /usr/lib/jvm/java-8-oracle

• Microsoft Windows: C:\Program Files\Java\jre1.8.0_51

#### 4.4.1. Set JAVA_HOME on Linux

Option 1: Set the Java environment for the current user
vi ~/.bash_profile
export JAVA_HOME=/path/to/java
Option 2: Set the Java environment for all users on boot time
vi /etc/profile
export JAVA_HOME=/path/to/java

#### 4.4.2. Set JAVA_HOME on Microsoft Windows

Option 1: Set JAVA_HOME as user specific system variable
setx "JAVA_HOME" "path\to\java"
Option 2: Set JAVA_HOME as a System variable
setx /M "JAVA_HOME" "path\to\java"

## 5. RRDtool

In most Open Source applications, RRDtool is often used and is the de-facto open standard for Time Series Data. The basic installation of OpenNMS comes with JRobin but it is simple to switch the system to use RRDtool to persist Time Series Data. This section describes how to install RRDtool, the jrrd2 OpenNMS Java Interface and how to configure OpenNMS to use it. RRDtool can be installed from the official package repositories provided by RHEL and Debian based Linux distributions.

### 5.1. RHEL

Installation on RHEL/CentOS
yum install rrdtool

### 5.2. Debian

Installation of RRDtool on Debian/Ubuntu
apt-get install rrdtool

### 5.3. Source

If you want the latest version of RRDtool, you may want to compile it from source. Instructions for doing so are at rrdbuild.

 The latest version of RRDtool may not always be compatible with the version of OpenNMS that you want to run. Please ask about RRDtool support on the discussion lists or chat rooms if you have any problems running a new version of RRDtool.
 If you want to install the latest RRDtool from source, make sure the rrdtool binary is in search path. To make the setup easier, you can link the binary to /usr/bin/rrdtool which is the location where OpenNMS will expect to find the executable binary.

### 5.4. Install jrrd2 Interface

To get access from the OpenNMS Java Virtual Machine you have to install jrrd2 as an interface. You can install it from the OpenNMS package repository with:

Installation of jrrd2 on RHEL/CentOS
yum install jrrd2
Installation of jrrd2 on Debian/Ubuntu
apt-get install jrrd2
 With OpenNMS 17.0.0 it is preferred to use jrrd2 instead of jrrd. The jrrd2 module is improved for performance by adding multithreading capabilities.

### 5.5. Configure OpenNMS Horizon

To configure OpenNMS to use RRDtool instead of JRobin configure the following properties in rrd-configuration.properties.

Configuration of RRDtool in OpenNMS on RHEL/CentOS
org.opennms.rrd.strategyClass=org.opennms.netmgt.rrd.rrdtool.MultithreadedJniRrdStrategy
org.opennms.rrd.interfaceJar=/usr/share/java/jrrd2.jar
opennms.library.jrrd2=/usr/lib64/libjrrd2.so
Configuration of RRDtool in OpenNMS on Debian/Ubuntu
org.opennms.rrd.strategyClass=org.opennms.netmgt.rrd.rrdtool.MultithreadedJniRrdStrategy
org.opennms.rrd.interfaceJar=/usr/share/java/jrrd2.jar
opennms.library.jrrd2=/usr/lib/jni/libjrrd2.so
 OpenNMS expects the RRDtool binary in /usr/bin/rrdtool.
Table 2. References to the RRDtool binary
Configuration file Property

opennms.properties

rrd.binary=/usr/bin/rrdtool

response-adhoc-graph.properties

command.prefix=/usr/bin/rrdtool

response-graph.properties

command.prefix=/usr/bin/rrdtool
info.command=/usr/bin/rrdtool

snmp-adhoc-graph.properties

command.prefix=/usr/bin/rrdtool

snmp-graph.properties

command.prefix=/usr/bin/rrdtool
command=/usr/bin/rrdtool info

## 6. Newts

Newts is a time-series data store based on Apache Cassandra. Newts is a persistence strategy, that can be used as an alternative to JRobin or RRDtool.

 It is currently not supported to initialize the Newts keyspace from Microsoft Windows Server operating system. Microsoft Windows based Cassandra server can be part of the cluster, but keyspace initialization is only possible using a _Linux-_based system.

### 6.1. Setting up Cassandra

It is recommended to install Cassandra on a dedicated server, but is also possible to run a node on the OpenNMS Horizon server itself. This installation guide describes how to set up a single Cassandra instance for evaluating and testing Newts. These steps are not suitable for a high performance production Cassandra Cluster. For further information see Cassandra Getting Started Guide. If you already have a running cluster you can skip this section.

#### 6.1.1. RHEL

This section describes how to install the latest Cassandra 2.1.x release on a RHEL based systems for Newts. The first step is to add the DataStax community repository and install the required GPG Key to verify the integrity of the RPM packages. After that install the package with yum and the Cassandra service is managed by Systemd.

 This description was built on RHEL 7 and CentOS 7.1.
vi /etc/yum.repos.d/datastax.repo
Content of the datastax.repo file
[datastax]
name = "DataStax Repo for Apache Cassandra"
baseurl = http://rpm.datastax.com/community
enabled = 1
gpgcheck = 1
Install GPG key to verify RPM packages
rpm --import http://rpm.datastax.com/rpm/repo_key
Install latest Cassandra 2.1.x package
yum install dsc21
Enable Cassandra to start on system boot
chkconfig cassandra on
Start cassandra service
service cassandra start
 Verify whether the Cassandra service is automatically started after rebooting the server.

#### 6.1.2. Debian

This section describes how to install the latest Cassandra 2.1.x release on a Debian-based system for Newts. The first step is to add the DataStax community repository and install the required GPG Key to verify the integrity of the DEB packages. After that install the packages with apt and the Cassandra service is added to the runlevel configuration.

 This description was built on Debian 8 and Ubuntu 14.04 LTS.
vi /etc/apt/sources.list.d/cassandra.sources.list
Content of the cassandra.sources.list file
deb http://debian.datastax.com/community stable main
Install GPG key to verify DEB packages
wget -O - http://debian.datastax.com/debian/repo_key | apt-key add -
Install latest Cassandra 2.1.x package
apt-get update
apt-get install dsc21=2.1.10-1 cassandra=2.1.10

The Cassandra service is added to the runlevel configuration and is automatically started after installing the package.

 Verify whether the Cassandra service is automatically started after rebooting the server.

#### 6.1.3. Microsoft Windows

This section describes how to install the latest Cassandra 2.1.x release on a Microsoft Windows Server based systems for Newts. The first step is to download the graphical installer and register Cassandra as a Windows Service so it can be manged through the Service Manager.

 This description was built on Windows Server 2012.
Download the DataStax graphical installer for Cassandra from PowerShell or a Browser
cd C:\Users\Administrator\Downloads
Invoke-WebRequest http://downloads.datastax.com/community/datastax-community-64bit_2.1.10.msi -Outfile datastax-community-64bit_2.1.10.msi

Run the Windows Installer file from PowerShell or through Windows Explorer and follow the setup wizard to install. During the installation, accept the options to automatically start the services. By default the DataStax Server, OpsCenter Server and the OpsCenter Agent will be automatically installed and started.

 The DataStax OpsCenter Server is only required to be installed once per Cassandra Cluster.
 If you install the DataStax OpsCenter make sure you have Chrome or Firefox installed.

### 6.2. Configure OpenNMS Horizon

Once Cassandra is installed, OpenNMS Horizon can be configured to use Newts. To enable and configure Newts, set the following properties in ${OPENNMS_HOME}/etc/opennms.properties: Configuration for OpenNMS Horizon # Configure storage strategy org.opennms.rrd.storeByForeignSource=true org.opennms.timeseries.strategy=newts # Configure Newts time series storage connection org.opennms.newts.config.hostname=$ipaddress$org.opennms.newts.config.keyspace=newts org.opennms.newts.config.port=9042  The org.opennms.newts.config.hostname property also accepts a comma separated list of hostnames and or IP addresses. Once Newts has been enabled, you can initialize the Newts schema in Cassandra with the following: Initialize Newts keyspace in Cassandra ${OPENNMS_HOME}/bin/newts init

Optionally, you can now connect to your Cassandra cluster and verify that the keyspace has been properly initialized:

Verify if the keyspace is initialized with cqlsh
cqlsh
use newts;
describe table terms;
describe table samples;

Restart OpenNMS Horizon to apply the changes.

## 7. R Statistics System

R is a free software environment for statistical computing and graphics. OpenNMS can leverage the power of R for forecasting and advanced calculations on collected time series data.

OpenNMS interfaces with R via stdin and stdout, and for this reason, R must be installed on the same host as OpenNMS. Note that installing R is optional, and not required by any of the core components.

 The R integration is not currently supported on Microsoft Windows systems.

### 7.1. RHEL

This section describes how to install R on a RHEL based system.

 This description was built on RHEL 7 and CentOS 7.1.
Install the EPEL repositories
yum install epel-release
Install R
yum install R

### 7.2. Debian

This section describes how to install R on a Debian-based system.

 This description was built on Debian 8 and Ubuntu 14.04 LTS.
Install R
sudo apt-get install r-recommended