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. The backup storage path in this example 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 your backup of OpenNMS Meridian components. Install a PostgreSQL database and restore your backup. Install OpenJDK. Create a systemd OpenNMS service unit. Requirements Backup files you created in Debian Ubuntu. A system user with administrative permissions (sudo). Internet access to download and install OpenJDK and PostgreSQL. The PostgreSQL archive repository also hosts older versions. Database password for opennms and postgres user. Restore backups CentOS/RHEL 8 Restore user/group definition sudo cat /tmp/opennms-passwd.txt >> /etc/passwd && \ sudo cat /tmp/opennms-group.txt >> /etc/group Create log folder sudo mkdir /var/log/opennms && \ chown opennms. /var/log/opennms Restore OpenNMS Meridian binaries, RRD archives, configurations sudo tar -xzf /tmp/opennms-opt.tar.gz -C / && \ sudo tar -xzf /tmp/opennms-var.tar.gz -C / Create OpenNMS systemd unit sudo cp /opt/opennms/etc/opennms.service /lib/systemd/system/ Assign CAP_NET_RAW capabilities See Assign CAP_NET_RAW capabilities. Install PostgreSQL database sudo dnf -y install postgresql-server postgresql Change the access policy for PostgreSQL See change the access policy for PostgreSQL. Restore OpenNMS database sudo runuser -l postgres -c 'psql -f /tmp/opennms_postgres.dmp postgres' Install OpenJDK sudo dnf -y install java-11-openjdk sudo /opt/opennms/bin/runjava -s Run install -dis command sudo /opt/opennms/bin/install -dis Firewall configuration Depending on where OpenNMS gets restored, you need to set the firewall settings again. See firewall settings and firewall core. firewall. Start OpenNMS service sudo systemctl start opennms Back up OpenNMS Meridian Overview