Do not use the UMS version older than the version of the existing UMS installation!
Instructions
The switch from a standard UMS installation to an HA installation involves the migration of the existing UMS Server to a new host and, in the case of the embedded database, the move to the external database.
The migration procedure generally involves the following steps:
Backing up and, if necessary, cleaning existing data
If the embedded database is in use: Setting up an external database and transferring the data from the existing database to the new one
Installing the first HA server with the tc.keystore file of the previous UMS installation, connecting it to the external database and transferring the files from the previous UMS installation
For the first HA server, take a new host machine, i.e. without the existing UMS installation. After you make sure that the migration has been successful, you can uninstall the old UMS Server and reinstall it with the HA extension.
Adding further components to the HA network, e.g. further UMS Servers, Load Balancers, UMS Console
Example with an Embedded DB
Detailed instructions are provided below. Follow them in the order given: