Under some cases where MariaDB is slow to start asterisk will not start. I believe this is because the included
asterisk.service systemd file in Issabel uses
After=mysql.service instead of
After=mariadb.service. So asterisk does not wait for MariaDB to start. If it is slow to start then asterisk will try start before mariadb has started and will fail.
To fix this the
asterisk.service file should be updated to add an