Run the installer

After your configuration files are ready, run the installer to deploy the database schema and application components.

Run the installer from the command line

Open a terminal on the target server and go to the installer folder.
Run the installer in unattended mode, pointing it to the prepared configuration file:
```
./contoso-installer --conf ./conf/contoso.conf --mode install
```
Monitor the console output, or the generated log file (install.log), for errors.
When the installer finishes, it prints a summary of the tasks it completed and any it skipped.

Run specific tasks only

The installer also supports running a single task, which is useful when you repeat a step after fixing a configuration issue:

./contoso-installer --conf ./conf/contoso.conf --task create-database-schema

Task name	Description
`create-database-schema`	Creates the application database schema, tables, and indexes.
`create-database-users`	Creates the database users and roles the application uses.
`deploy-application`	Copies the application binaries to the target server and registers the service.
`configure-message-broker`	Creates the queues and exchanges the message broker uses.

Note: Always back up the database before you rerun a task in an existing environment.

Considerations for upgrades

When you upgrade an existing installation, run the installer with --mode upgrade instead of --mode install. This preserves existing data and applies only the schema changes the new version requires.

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