Configuration

The configuration is comprised of a set of sections and parameters for those sections. You can set the configuration programmatically using nornir by passing a dictionary of options for each section, by using a YAML file, by setting the corresponding environment variables or by a combination of the three. The order of preference from less to more preferred is “configuration file” -> “env variable” -> “code”.

An example using InitNornir would be:

nr = InitNornir(
    core={"num_workers": 20},
    logging={"file": "mylogs", "level": "debug"}
)

A similar example using a yaml file:

---
core:
    num_workers: 20
inventory:
    plugin: nornir.plugins.inventory.simple.SimpleInventory
    options:
        host_file: "advanced_filtering/inventory/hosts.yaml"
        group_file: "advanced_filtering/inventory/groups.yaml"

Logging

By default, Nornir automatically configures logging when InitNornir is called. Logging configuration can be modified and available options are described in the section below. If you want to use Python logging module to configure logging, make sure to set logging.enabled parameter to False in order to avoid potential issues.

In some situations Nornir will detect previous logging configuration and will emit nornir.core.exceptions.ConflictingConfigurationWarning

Next, you can find each section and their corresponding options.

core

num_workers

Description	Number of Nornir worker threads that are run at the same time by default
Type	integer
Default	20
Required	False
Environment Variable	NORNIR_CORE_NUM_WORKERS

raise_on_error

Description	If set to True, (nornir.core.Nornir.run) method of will raise exception nornir.core.exceptions.NornirExecutionError if at least a host failed
Type	boolean
Default	False
Required	False
Environment Variable	NORNIR_CORE_RAISE_ON_ERROR

inventory

plugin

Description	Import path to inventory plugin
Type	string
Default	nornir.plugins.inventory.simple.SimpleInventory
Required	False
Environment Variable	NORNIR_INVENTORY_PLUGIN

options

Description	kwargs to pass to the inventory plugin
Type	object
Default	{}
Required	False
Environment Variable	NORNIR_INVENTORY_OPTIONS

transform_function

Description	Path to transform function. The transform_function you provide will run against each host in the inventory
Type	string
Default
Required	False
Environment Variable	NORNIR_INVENTORY_TRANSFORM_FUNCTION

transform_function_options

Description	kwargs to pass to the transform_function
Type	object
Default	{}
Required	False
Environment Variable	NORNIR_INVENTORY_TRANSFORM_FUNCTION_OPTIONS

ssh

config_file

Description	Path to ssh configuration file
Type	string
Default	~/.ssh/config
Required	False
Environment Variable	NORNIR_SSH_CONFIG_FILE

logging

enabled

Description	Whether to configure logging or not
Type	boolean
Default	None
Required	False
Environment Variable	NORNIR_LOGGING_ENABLED

level

Description	Logging level
Type	string
Default	INFO
Required	False
Environment Variable	NORNIR_LOGGING_LEVEL

file

Description	Logging file
Type	string
Default	nornir.log
Required	False
Environment Variable	NORNIR_LOGGING_FILE

format

Description	Logging format
Type	string
Default	%(asctime)s - %(name)12s - %(levelname)8s - %(funcName)10s() - %(message)s
Required	False
Environment Variable	NORNIR_LOGGING_FORMAT

to_console

Description	Whether to log to console or not
Type	boolean
Default	False
Required	False
Environment Variable	NORNIR_LOGGING_TO_CONSOLE

loggers

Description	Loggers to configure
Type	array
Default	['nornir']
Required	False
Environment Variable	NORNIR_LOGGING_LOGGERS

jinja2

filters

Description	Path to callable returning jinja filters to be used
Type	string
Default
Required	False
Environment Variable	NORNIR_JINJA2_FILTERS

user_defined

You can set any <k, v> pair you want here and you will have it available under your configuration object, i.e. nr.config.user_defined.my_app_option.