Upgrading a multiple instance Lighthouse

Lighthouse must be upgraded in succession. For example, to upgrade to a version that is several releases newer than your current release, you will need to install all the major releases in between to install the newest one.

Before a multiple instance upgrade is attempted, compatibility and status checks are performed on primary/secondary instances to pre-empt possible failure points.

Secondary Lighthouse upgrades are performed in parallel (not in a queue) to speed up the overall process of rolling upgrades.

Where there are multiple instances of Lighthouse, when a system upgrade is being performed the status of dependent instances is flagged in the System Upgrade page.

When the primary Lighthouse is updated, any secondary Lighthouses will be updated in a rolling fashion after the primary has successfully booted. If any Lighthouse fails to successfully update along the way, the update will stop.