django.db.utils.OperationalError: (2003, "Can't connect to MySQL server on '127.0.0.1:3307' (111)")

Question

I've setup my project Django REST API on GCP VM running Ubuntu 22.0.4 LTS in a virtual environment. I'm currently configuring the following open source Rest API project: https://github.com/OkunaOrg/okuna-api

The Okuna CLI uses docker-compose to spawn and coordinate the following docker services. webserver - A server running the Okuna API db - A server with a MariaDB database redis - A server with a Redis database scheduler - A server responsible for running the scheduled Okuna jobs such as curating Explore/Top posts. worker - A server responsible for processing the Okuna jobs such as publishing a post or curating posts

The Django backend opens up successfully at the GCP external IP address as configured by me in the okuna-cli.py. However I face problems when I run

python3.8 manage.py migrate

The Error trace

django.db.utils.OperationalError: (2003, "Can't connect to MySQL server on '127.0.0.1:3307' (111)")

The.env file( https://github.com/OkunaOrg/okuna-api/blob/master/templates/.env ) has the following pertaining to the above error:

# [NAME] ALLOWED_HOSTS
# [DESCRIPTION] Django variable specifying allowed hosts.
# [REQUIRED][PRODUCTION]
# [MORE] https://docs.djangoproject.com/en/2.1/ref/settings/#allowed-hosts
# ALLOWED_HOSTS=openbook.social

# [GROUP] SQL Database Configuration
# [DESCRIPTION] The SQL database configuration
# [REQUIRED][ALWAYS]
RDS_DB_NAME=okuna
RDS_USERNAME=root
RDS_HOSTNAME=127.0.0.1
RDS_PORT=3307
RDS_HOSTNAME_READER=127.0.0.1
RDS_HOSTNAME_WRITER=127.0.0.1
# [NAME] RDS_PASSWORD
# [DESCRIPTION] The password for the SQL Database.
RDS_PASSWORD={{SQL_PASSWORD}}

# [GROUP] Redis Database configuration Configuration
# [DESCRIPTION] The redis database configuration
# [REQUIRED][ALWAYS]
REDIS_HOST=127.0.0.1
REDIS_PORT=6380
# [NAME] REDIS_PASSSWORD
# [DESCRIPTION] The password for the REDIS Database. If using okuna-cli, obtained from .okuna-cli.json
REDIS_PASSWORD={{REDIS_PASSWORD}}

The.docker-compose.env file( https://github.com/OkunaOrg/okuna-api/blob/master/templates/.docker-compose.env ) has the following pertaining to the above error:

# [NAME] ALLOWED_HOSTS
# [DESCRIPTION] Django variable specifying allowed hosts.
# [REQUIRED][PRODUCTION]
# [MORE] https://docs.djangoproject.com/en/2.1/ref/settings/#allowed-hosts
# ALLOWED_HOSTS=openbook.social

# [GROUP] SQL Database Configuration
# [DESCRIPTION] The SQL database configuration
# [REQUIRED][ALWAYS]
RDS_DB_NAME=okuna
RDS_USERNAME=root
RDS_HOSTNAME=db.okuna
RDS_PORT=3306
RDS_HOSTNAME_READER=db.okuna
RDS_HOSTNAME_WRITER=db.okuna
# [NAME] RDS_PASSWORD
# [DESCRIPTION] The password for the SQL Database. If using okuna-cli, obtained from .okuna-cli.json
RDS_PASSWORD={{SQL_PASSWORD}}

# [GROUP] Redis Database configuration Configuration
# [DESCRIPTION] The redis database configuration
# [REQUIRED][ALWAYS]
REDIS_HOST=redis.okuna
REDIS_PORT=6379
# [NAME] REDIS_PASSSWORD
# [DESCRIPTION] The password for the REDIS Database.
REDIS_PASSWORD={{REDIS_PASSWORD}}

The settings.py file( https://github.com/OkunaOrg/okuna-api/blob/master/openbook/settings.py ) has the following pertaining to the above error:

ALLOWED_HOSTS = os.environ.get('ALLOWED_HOSTS')
if IS_PRODUCTION:
    if not ALLOWED_HOSTS:
        raise NameError('ALLOWED_HOSTS environment variable is required when running on a production environment')
    ALLOWED_HOSTS = [allowed_host.strip() for allowed_host in ALLOWED_HOSTS.split(',')]
else:
    if ALLOWED_HOSTS:
        logger.info('ALLOWED_HOSTS environment variable ignored.')
    ALLOWED_HOSTS = ['*']   
    
REDIS_HOST = os.environ.get('REDIS_HOST', 'localhost')
REDIS_PORT = int(os.environ.get('REDIS_PORT', '6379'))
REDIS_PASSWORD = os.environ.get('REDIS_PASSWORD')    

Here is the docker-compose-full.yaml( https://github.com/OkunaOrg/okuna-api/blob/master/docker-compose-full.yml )

 version: '3' services: webserver: container_name: okuna-api build: dockerfile: Dockerfile context: ./.docker/api privileged: true extra_hosts: - db.okuna:172.16.16.4 - redis.okuna:172.16.16.5 volumes: -./:/opt/okuna-api -./.docker-cache/pip:/root/.cache/pip ports: - 80:80 working_dir: /opt/okuna-api.networks: okuna: ipv4_address: 172.16.16.1 depends_on: - db - redis env_file: -.docker-compose.env worker: container_name: okuna-worker build: dockerfile: Dockerfile context: ./.docker/worker privileged: true extra_hosts: - db.okuna:172.16.16.4 - redis.okuna:172.16.16.5 volumes: -./:/opt/okuna-api -./.docker-cache/pip:/root/.cache/pip working_dir: /opt/okuna-api.networks: okuna: ipv4_address: 172.16.16.2 depends_on: - webserver env_file: -.docker-compose.env scheduler: container_name: okuna-scheduler build: dockerfile: Dockerfile context: ./.docker/scheduler privileged: true extra_hosts: - db.okuna:172.16.16.4 - redis.okuna:172.16.16.5 volumes: -./:/opt/okuna-api -./.docker-cache/pip:/root/.cache/pip working_dir: /opt/okuna-api.networks: okuna: ipv4_address: 172.16.16.3 depends_on: - webserver env_file: -.docker-compose.env db: image: mariadb:10.4.5 hostname: db.okuna volumes: - mariadb:/var/lib/mysql ports: - 3306 privileged: false.networks: okuna: ipv4_address: 172.16.16.4 command: --character-set-server=utf8 --collation-server=utf8_unicode_ci env_file: -.docker-compose.env redis: image: bitnami/redis:latest privileged: false ports: - 6379.networks: okuna: ipv4_address: 172.16.16.5 env_file: -.docker-compose.env volumes: - redisdb:/bitnami/redis/data volumes: mariadb: redisdb:.networks: okuna: ipam: driver: default config: - su.net: "172.16.16.0/16"

Need help here. Thanks.

Answer 1

Use docker ps -a to identify the port that you are binding to 3306 if you're trying to acces it from your localhost, if you're trying to acces it from another container inside your.network (okuna) consider using the service name, if you refer to it as 127.0.0.1 from inside your container it will try to connect to the api container itself

Answer 2

The solution is as follows: The ip4 address of the databases mentioned in the containers to be created in the yaml file needs to be added to the.env file inplace of 127.0.0.1