Trigger automation base on error message in log

Configuration
1

I’m wondering is it possible to trigger automation base on error message in log? For example, I would like the system to reboot itself when certain component breaks down.

2

Hi @masterkenobi, not tested, but i think you could use the Command line Binary Sensor as trigger.

binary_sensor:
  - platform: command_line
    command: if grep -i 'Fatal read error on socket transport' .homeassistant/home-assistant.log >/dev/null; then echo ON; else echo OFF; fi
3 Likes
3

Here’s what I did to control if mosquitto server (mqtt) is not running properly when home assistant is started:

Sensor:

### MQTT invalid config - mosquitto not running properly ###
- platform: template
    sensors:
      mqtt_offline:
        value_template: >-
          {% if '[mqtt]' in states.persistent_notification.invalid_config.state %}
              Yes
          {% else %}
              No
          {% endif %}

Automation:

### If Mosquitto config fails, notify and restart mosquitto and then HASS ###
-  alias: 'Restart if Mosquitto not OK'
   trigger:
     platform: state
     entity_id: 'sensor.mqtt_offline'
     to: 'Yes'
   action:
     - delay:
         seconds: 60
     - service: notify.iOS
       data:
         message: 'Home Assistant will be restarted as MQTT was not running properly.'
         title: 'Home Assistant issue'
     - service: script.mosquitto_hass_fix

This might give you ideas for what you need.

3 Likes
4

What is in this script?

5

Script:

### Mosquitto + Home Assistant restart ###
mosquitto_hass_fix:
  alias: "Mosquitto + Home Assistant restart"
  sequence:
    - service: shell_command.mosquitto_hass_fix

Shell command:

### Mosquitto + Home Assistant restart ###
mosquitto_hass_fix: "sudo service mosquitto restart && sudo systemctl restart [email protected]"

For user homeassistant to be able to run these commands, I needed to add the following file in /etc/sudoers.d

Cmnd_Alias MYSHELL = /usr/sbin/service, /bin/systemctl
homeassistant ALL=(ALL)NOPASSWD:MYSHELL

Hope this helps.

6

I used the code for the sensor:
{% if ‘[mqtt]’ in states.persistent_notification.invalid_config.state %}
Yes
{% else %}
No
{% endif %}
But it does not detect me correctly when it fails, any solution?
Screen:


Thanks!

7

Fix:
{% if ‘mqtt’ in states.persistent_notification.invalid_config.attributes.message %}
yes
{% else %}
NO
{% endif %}

8

Really old, but this may still be useful. In the 2024 version of HA Core, I use the following automation to restart an integration when a certain error pops up (search for the integration entity_id in the file .storage/core.config_entries in the config directory:

- alias: "91004 - Samsung FamilyHub Integration error"
  trigger:
    platform: event
    event_type: system_log_event
    event_data:
      level: ERROR
      logger: custom_components.samsung_familyhub_fridge.api
  condition:
    condition: template
    value_template: '{{ "Unexpected error fetching File ID refresher data:" in trigger.event.data.message[0] }}'
  action:
    service: homeassistant.reload_config_entry
    data:
      entry_id: ***