This section outlines the steps to follow to upgrade to a newer version of Meridian. You may need to complete additional steps to upgrade in a more complex setup (running more than one OpenNMS instance, database migration requirements, age of current version, and so on).

A basic upgrade of one instance can take about an hour. This time varies, and will be longer depending on how customized and complex your setup is.

## Before you begin

There are a number of tasks you should complete before starting an upgrade:

• Check the release notes for breaking changes in each release between your current version and the version you want to upgrade to. Address any issues that might affect you.

• Stop OpenNMS and PostgreSQL services.

• Back up your database. (same day/state)

• Back up RRD files. (same day/state)