Restore OpenNMS Meridian This section describes a basic restore process for a default OpenNMS Meridian installation. OpenNMS Meridian binaries, logs, RRD archives, configurations and the database will be restored. In this example the backup storage path is /tmp for demonstration purposes. Please be aware that /tmp is not persisted, as most operating systems will delete the content at bootup. Objectives Restore backup of OpenNMS Meridian components Install PostgreSQL database and restore backup Install OpenJDK Create systemd OpenNMS service unit Requirements The backups that were made in System user with administrative permissions (sudo) Internet access to download and install OpenJDK and PostgreSQL NOTE: PostgreSQL archive repository provides also older PostgreSQL versions Database password for opennms and postgres user Restore backups Back up OpenNMS Meridian Housekeeping Tasks