Our elrond-$network package upgrade (where $network is either main, test, or dev) is handled by Chef/Cinc. The ['elrond']['version'] attribute must be specified for setting up nodes using this cookbook and it identifies a published version in our repositories.
The upgrade of the package itself triggers a set of actions (via the notify/subscribe system) to refresh the configuration based on the upstream configuration packaged with the new build. Then, Chef/Cinc re-creates the changes to the configuration in order to restore the node state. At the end of the run, all of the elrond-node@ID services are restated.
Essentially, this means:
- Restoring p2p.toml custom setting i.e
Port. - Restoring prefs.toml custom settings i.e
NodeDisplayName,Identity,RedundancyLevel. - Create new node keys for observers or restore node keys from the local key store for validators.