How to Configure OpenNMS in CentOS

To Configure OpenNMS in CentOS

OpenNMS is an open Source network monitoring system that can be used for monitoring unlimited devices at a single instance. It detects the services or nodes automatically in your network. The procedures to configure OpenNMS in CentOS is explained in this article.

To install OpenNMS

First add the OpenNMS RPM Repository.

[root@localhost Desktop]# wget http://yum.opennms.org/repofiles/opennms-repo-stable-rhel7.noarch.rpm 
--2016-10-05 21:24:00--  http://yum.opennms.org/repofiles/opennms-repo-stable-rhel7.noarch.rpm
&hellip 
&hellip 
2016-10-05 21:24:01 (1.27 MB/s) - ‘ opennms-repo-stable-rhel7.noarch.rpm’  saved [3882/3882]

[root@localhost Desktop]# rpm -Uvh opennms-repo-stable-rhel7.noarch.rpm
warning: opennms-repo-stable-rhel7.noarch.rpm: Header V3 DSA/SHA1 Signature, key ID 5b9efd43: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:opennms-repo-stable-1.0-107      ################################# [100%]

Run the following command to install Java.

[root@localhost Desktop]# yum install java 
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: centos.webwerks.com
&hellip 
&hellip 
Dependency Updated:
  java-1.7.0-openjdk-headless.x86_64 1:1.7.0.111-2.6.7.2.el7_2                  
Complete!

Using the following command install PostgreSQL.

[root@localhost Desktop]# yum install postgresql-server postgresql-contrib 
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: centos.webwerks.com
.
.
.
Dependency Installed:
  postgresql.x86_64 0:9.2.15-1.el7_2   postgresql-libs.x86_64 0:9.2.15-1.el7_2  
  uuid.x86_64 0:1.6.2-26.el7          
Complete!

Initialize the Database for OpenNMS.

[root@localhost Desktop]# postgresql-setup initdb 
Initializing database ... OK

Start and enable the postgreSQL service

[root@localhost Desktop]#  /sbin/service postgresql start 
[root@localhost Desktop]# systemctl enable postgresql
ln -s ' /usr/lib/systemd/system/postgresql.service'  ' /etc/systemd/system/multi-user.target.wants/postgresql.service' 

To Configure PostgreSQL

Edit the postgresql.conf file as follows.

#------------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#------------------------------------------------------------------------------
listen_addresses = ' localhost' 
max_connections = 256
#------------------------------------------------------------------------------
# RESOURCE USAGE
#------------------------------------------------------------------------------
shared_buffers = 1024MB

Then permit the access to the Database by editing the " pg_hba.conf" file as shown below.

# TYPE DATABASE USER ADDRESS METHOD
# " local"  is for Unix domain socket connections only
local all all trust
# IPv4 local connections:
host all all 127.0.0.1/32 trust
# IPv6 local connections:
host all all ::1/128 trust

After setting the permission, Start installing OpenNMS by executing the below command.

[root@localhost Desktop]# yum -y install opennms 
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: centos.webwerks.com
.
.
Installed:
opennms.noarch 0:18.0.2-1
Dependency Installed:
jdk1.8.0_60.x86_64 2000:1.8.0_60-fcs jicmp.x86_64 0:1.4.5-2 jicmp6.x86_64 0:1.2.4-1 opennms-core.noarch 0:18.0.2-1 opennms-webapp-jetty.noarch 0:18.0.2-1
Complete!

Once the installation is successfully built, configure JAVA for OpenNMS

[root@localhost Desktop]# /opt/opennms/bin/runjava -s 
runjava: Looking for an appropriate JRE...
runjava: Checking for an appropriate JRE in JAVA_HOME...
runjava: skipping... JAVA_HOME not set
runjava: Checking JRE in user' s path: " /usr/bin/java" ...
runjava: /usr/bin/java is not Java 1.8 or newer.
runjava: did not find an appropriate JRE in user' s path: " /usr/bin/java" 
runjava: searching for a good JRE...
runjava: found a good JRE in " /usr/java/jdk1.8.0_60/bin/java" 
runjava: value of " /usr/java/jdk1.8.0_60/bin/java"  stored in configuration file

Upgrade OpenNMS by adding the following command.

[root@localhost Desktop]# /opt/opennms/bin/install -dis 
==============================================================================
OpenNMS Installer
==============================================================================
Configures PostgreSQL tables, users, and other miscellaneous settings.
DEBUG: Platform is IPv6 ready: true
.
.
.
- Running post-execution phase
Removing backup /opt/opennms/etc/discovery-configuration.xml.zip
Finished in 0 seconds
Upgrade completed successfully!

Then follow the below instruction to configure firewall for permitting OpenNMS.

[root@localhost Desktop]# firewall-cmd --permanent --add-port=8980/tcp 
success
[root@localhost Desktop]# firewall-cmd --reload 
Success

Start OpenNMS and Login to Web Interface as follows.

[root@localhost Desktop]# systemctl start opennms
[root@localhost Desktop]# systemctl enable opennms 
ln -s ' /usr/lib/systemd/system/opennms.service'  ' /etc/systemd/system/multi-user.target.wants/opennms.service' 

Open the web browser and enter the URL http://< IP_address> :8980/opennms/login.jsp

OpenNMS Home Page appears as follows.

OpenNMS configuration option

Change admin password by clicking Change password.