home-assistant.io/source/_integrations/logger.markdown

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title	description	logo	ha_category	ha_qa_scale	ha_release
Logger	Instructions on how to enable the logger integration for Home Assistant.	home-assistant.png	Utility	internal	0.8

The logger integration lets you define the level of logging activities in Home Assistant.

To enable the logger integration in your installation, add the following to your configuration.yaml file:

# Example configuration.yaml entry
logger:

To log all messages and ignore events lower than critical for specified components:

# Example configuration.yaml entry
logger:
  default: info
  logs:
    homeassistant.components.yamaha: critical
    custom_components.my_integration: critical

To ignore all messages lower than critical and log event for specified components:

# Example configuration.yaml entry
logger:
  default: critical
  logs:
    # log level for HA core
    homeassistant.core: fatal
    
    # log level for MQTT integration
    homeassistant.components.mqtt: warning
    
    # log level for SmartThings lights
    homeassistant.components.smartthings.light: info

    # log level for a custom component
    custom_components.my_integration: debug

    # log level for the `aiohttp` Python package
    aiohttp: error

{% configuration %} default: description: Default log level. See log_level. required: false type: string default: debug logs: description: List of integrations and their log level. required: false type: map keys: '<component_namespace>': description: Logger namespace of the component. See log_level. type: string {% endconfiguration %}

Log Levels

Possible log severity levels, listed in order from most severe to least severe, are:

• critical
• fatal
• error
• warning
• warn
• info
• debug
• notset

Services

Service set_default_level

You can alter the default log level (for integrations without a specified log level) using the service logger.set_default_level.

An example call might look like this:

service: logger.set_default_level
data:
  level: info

Service set_level

You can alter log level for one or several integrations using the service logger.set_level. It accepts the same format as logs in the configuration.

An example call might look like this:

service: logger.set_level
data:
  homeassistant.core: fatal
  homeassistant.components.mqtt: warning
  homeassistant.components.smartthings.light: info
  custom_components.my_integration: debug
  aiohttp: error

The log information are stored in the configuration directory as home-assistant.log and you can read it with the command-line tool cat or follow it dynamically with tail -f.

If you are a Hassbian user you can use the example below:

$ tail -f /home/homeassistant/.homeassistant/home-assistant.log

If you are a Hass.io user, you can use the example below, when logged in through the SSH add-on:

$ tail -f /config/home-assistant.log