Minimum system requirements System resource requirements Just testing* Minimum server specification** CPU 2 GHz dual core x86_64 3 GHz quad core x86_64 and above RAM 4 GB (physical) 8 GB (physical) and above Storage (disk space) 20 GB HDD, SSD 100 GB with SSD and above *You can install the packages and the services will start up. **Does not consider your intended workload, for example, network size, number of monitored metrics, flows, events, and data retention requirements. Operating systems OpenNMS Horizon runs on the following operating systems. See the release notes for information about platform support changes, including deprecated platforms. Operating System Supported Versions (64-bit) RHEL 7.x 8.x CentOS 7.x 8.x Debian 9 - 11 Ubuntu 20.04 LTS Minion Install Minion