Recorder stops working after reboot Host OS

Everything works fine.
Today I restarted my raspberry Pi 3 and now Recorder/Logbook/History stops working.

I use the Maria DB Addon for the recorder.
I checked the configuration
I already reinstalled the Addon.
I restarted HA and Host OS multiple times.

Hassio is on v0.76 Maybe it has something to do with the last update.

Please help

recorder:
  purge_interval: 1
  purge_keep_days: 15
  db_url: mysql://hass:mariaDB_PW@core-mariadb/homeassistant

LOG

2017-12-13 22:27:18 ERROR (Recorder) [homeassistant.components.recorder] Error during connection setup: (_mysql_exceptions.OperationalError) (2005, "Unknown MySQL server host 'core-mariadb' (-3)") (retrying in 3 seconds)
2017-12-13 22:27:19 WARNING (MainThread) [homeassistant.setup] Setup of recorder is taking over 10 seconds.
2017-12-13 22:27:26 ERROR (Recorder) [homeassistant.components.recorder] Error during connection setup: (_mysql_exceptions.OperationalError) (2005, "Unknown MySQL server host 'core-mariadb' (-3)") (retrying in 3 seconds)
2017-12-13 22:27:34 ERROR (Recorder) [homeassistant.components.recorder] Error during connection setup: (_mysql_exceptions.OperationalError) (2005, "Unknown MySQL server host 'core-mariadb' (-3)") (retrying in 3 seconds)
2017-12-13 22:27:42 ERROR (Recorder) [homeassistant.components.recorder] Error during connection setup: (_mysql_exceptions.OperationalError) (2005, "Unknown MySQL server host 'core-mariadb' (-3)") (retrying in 3 seconds)
2017-12-13 22:27:50 ERROR (Recorder) [homeassistant.components.recorder] Error during connection setup: (_mysql_exceptions.OperationalError) (2005, "Unknown MySQL server host 'core-mariadb' (-3)") (retrying in 3 seconds)
2017-12-13 22:27:58 ERROR (Recorder) [homeassistant.components.recorder] Error during connection setup: (_mysql_exceptions.OperationalError) (2005, "Unknown MySQL server host 'core-mariadb' (-3)") (retrying in 3 seconds)
2017-12-13 22:28:06 ERROR (Recorder) [homeassistant.components.recorder] Error during connection setup: (_mysql_exceptions.OperationalError) (2005, "Unknown MySQL server host 'core-mariadb' (-3)") (retrying in 3 seconds)
2017-12-13 22:28:14 ERROR (Recorder) [homeassistant.components.recorder] Error during connection setup: (_mysql_exceptions.OperationalError) (2005, "Unknown MySQL server host 'core-mariadb' (-3)") (retrying in 3 seconds)
2017-12-13 22:28:22 ERROR (Recorder) [homeassistant.components.recorder] Error during connection setup: (_mysql_exceptions.OperationalError) (2005, "Unknown MySQL server host 'core-mariadb' (-3)") (retrying in 3 seconds)
2017-12-13 22:28:30 ERROR (Recorder) [homeassistant.components.recorder] Error during connection setup: (_mysql_exceptions.OperationalError) (2005, "Unknown MySQL server host 'core-mariadb' (-3)") (retrying in 3 seconds)
2017-12-13 22:28:30 ERROR (MainThread) [homeassistant.setup] Setup failed for recorder: Component failed to initialize.
2017-12-13 22:28:30 ERROR (MainThread) [homeassistant.setup] Unable to setup dependencies of history. Setup failed for dependencies: recorder
2017-12-13 22:28:30 ERROR (MainThread) [homeassistant.setup] Setup failed for history: Could not setup all dependencies.
2017-12-13 22:28:33 ERROR (MainThread) [homeassistant.setup] Unable to setup dependencies of logbook. Setup failed for dependencies: recorder

Ok I removed the msql setting from the configuration.ymal.

Now its working.

But why its not working with MariaDB?