Mariadb docker container Can't connect to MySQ

I am trying the connect mariadb with python using docker-compose:

docker-compose.yml

    version: '2'
    services:
      mariadb:
        image: bitnami/mariadb
        ports:
          - "3306:3306"
        environment:
          MARIADB_DATABASE: 'mary_db'
          MARIADB_USER: user2
          MARIADB_PASSWORD: 'pass1234'
      consumer:
          build: ./consumer
          links:
            - mariadb

consumer.py

    import mysql.connector as mariadb1

    mariadb_connection = mariadb1.connect(host='mariadb',
                                  port=3306,
                                 user='user2',
                                 password='pass1234',
                                 database='mary_db')

    cursor = mariadb_connection.cursor(buffered=True)

    try:
        cursor.execute('DROP TABLE names')
    except:
        pass

    comm = "CREATE TABLE names(id VARCHAR(20), location VARCHAR(100)," \
   "PRIMARY KEY (mac,location)) ENGINE=InnoDB"

    cursor.execute(comm)
    print 'created'

The Dockerfile entrypoint is just calling the consumer.py function like:

    ENTRYPOINT python -u consumer.py

The problem is very randomly (more than %90 of trials), python code cannot connect with database and prints this error:

File "consumer.py", line 7, in database='mary_db') File "/usr/local/lib/python2.7/dist-packages/mysql/connector/init.py", line 179, in connect return MySQLConnection(*args, **kwargs) File "/usr/local/lib/python2.7/dist-packages/mysql/connector/connection.py", line 95, in init self.connect(**kwargs) File "/usr/local/lib/python2.7/dist-packages/mysql/connector/abstracts.py", line 719, in connect self._open_connection() File "/usr/local/lib/python2.7/dist-packages/mysql/connector/connection.py", line 206, in _open_connection self._socket.open_connection() File "/usr/local/lib/python2.7/dist-packages/mysql/connector/network.py", line 475, in open_connection errno=2003, values=(self.get_address(), _strioerror(err))) mysql.connector.errors.InterfaceError: 2003: Can't connect to MySQL server on 'mariadb:3306' (111 Connection refused)

Any idea what is going on?

The problem is not with Database or Python code; Its a raise problem coming from Docker, as database needs some time to load and python (consumer.py) container launches faster than database one.

Possible solutions:

docker healthcheck

waittime in docker

add a delay to the python consumer