Open Network Management System (OpenNMS) is a widely-used open-source platform for network monitoring and service management. This article provides a detailed guide to configuring and managing OpenNMS on the CentOS operating system, a popular choice for servers due to its stability and security. OpenNMS allows for in-depth analysis of network traffic and infrastructure performance, which is crucial for effective IT environment management.
Installation of OpenNMS on CentOS
Before installing OpenNMS, ensure that Java Development Kit (JDK) is installed on CentOS, as OpenNMS is a Java application. It is recommended to use OpenJDK 11, which can be installed using the following command:
sudo yum install java-11-openjdk-devel
Next, add the OpenNMS repository to your system using the following commands:
sudo rpm -Uvh https://yum.opennms.org/repofiles/opennms-repo-stable-rhel7.noarch.rpm
sudo yum install opennms
After installation, initialize the database. OpenNMS uses PostgreSQL as its database, so it is necessary to install and configure this database:
sudo yum install postgresql-server
sudo postgresql-setup initdb
sudo systemctl start postgresql
sudo systemctl enable postgresql
Then, create a database and user for OpenNMS in PostgreSQL:
sudo -u postgres createuser opennms
sudo -u postgres createdb -O opennms opennms
sudo -u postgres psql -c "ALTER USER opennms WITH PASSWORD 'password';"
The final installation step is to run the script to initialize the OpenNMS database and start the service:
sudo /usr/share/opennms/bin/install -dis
sudo systemctl start opennms
Configuration for In-Depth Analysis of Network Traffic
OpenNMS provides extensive options for monitoring and analyzing network traffic. To begin, it is important to set rules for automatically discovering network devices. This can be configured in the etc/discovery-configuration.xml file, where you define IP address ranges for scanning.
Additionally, it is crucial to configure data collection and threshold values for alerts. Data collection is configured in files like etc/collectd-configuration.xml, where you can specify which metrics to collect from each network device. Threshold values for generating alerts can be set in etc/thresholds.xml, allowing you to define at what values the system should generate alerts.
Management and Maintenance
To maintain optimal performance and security of OpenNMS and the entire monitored system, it is important to regularly update OpenNMS and its dependencies. This can be done using yum:
sudo yum update opennms
It is also recommended to regularly backup configuration files and the OpenNMS database. Backup of configuration files can be easily achieved by copying the /etc/opennms/ folder to a secure location. For backing up the PostgreSQL database used by OpenNMS, you can use the pg_dump command:
sudo -u postgres pg_dump opennms > opennms_backup.sql
This command creates a file opennms_backup.sql, which contains the entire contents of the OpenNMS database and can be used for database restoration if needed.
