reclass can read some of its configuration from a file. The file is a YAML-file and simply defines key-value pairs.
The configuration file can be used to set defaults for all the options that are otherwise configurable via the command-line interface, so please use the --help output of reclass (or the manual page) for reference. The command-line option --nodes-uri corresponds to the key nodes_uri in the configuration file. For example:
storage_type: yaml_fs pretty_print: True output: json inventory_base_uri: /etc/reclass nodes_uri: ../nodes
reclass first looks in the current directory for the file called reclass-config.yml (see reclass/defaults.py) and if no such file is found, it looks in $HOME, then in /etc/reclass, and then “next to” the reclass script itself, i.e. if the script is symlinked to /srv/provisioning/reclass, then the the script will try to access /srv/provisioning/reclass-config.yml.
Note that yaml_fs is currently the only supported storage_type, and it’s the default if you don’t set it.