Unable to connect to Mongodb container from flask container - mongodb

Question

#Docker compose file
version: "3.4" # optional since v1.27.0
services:
flaskblog:
build:
context: flaskblog
dockerfile: Dockerfile
image: flaskblog
restart: unless-stopped
environment:
APP_ENV: "prod"
APP_DEBUG: "False"
APP_PORT: 5000
MONGODB_DATABASE: flaskdb
MONGODB_USERNAME: flaskuser
MONGODB_PASSWORD:
MONGODB_HOSTNAME: mongodbuser
volumes:
- appdata:/var/www
depends_on:
- mongodb
networks:
- frontend
- backend
mongodb:
image: mongo:4.2
#container_name: mongodb
restart: unless-stopped
command: mongod --auth
environment:
MONGO_INITDB_ROOT_USERNAME: admin
MONGO_INITDB_ROOT_PASSWORD:
MONGO_INITDB_DATABASE: flaskdb
MONGODB_DATA_DIR: /data/db2
MONDODB_LOG_DIR: /dev/null
volumes:
- mongodbdata:/data/db2
#- ./mongo-init.js:/docker-entrypoint-initdb.d/mongo-init.js:ro
networks:
- backend
networks:
backend:
driver: bridge
volumes:
mongodbdata:
driver: local
appdata:
driver: local
#Flask container file
FROM python:3.8-slim-buster
#python:3.6-stretch
LABEL MAINTAINER="Shekhar Banerjee"
ENV GROUP_ID=1000 \
USER_ID=1000 \
SECRET_KEY="4" \
EMAIL_USER="dankml.com" \
EMAIL_PASS="nzw"
RUN mkdir /home/logix3
WORKDIR /home/logix3
ADD . /home/logix3/
RUN pip install -r requirements.txt
RUN pip install gunicorn
RUN groupadd --gid $GROUP_ID www
RUN useradd --create-home -u $USER_ID --shell /bin/sh --gid www www
USER www
EXPOSE 5000/tcp
#CMD ["python","run.py"]
CMD [ "gunicorn", "-w", "4", "--bind", "127.0.0.1:5000", "run:app"]
These are my docker-compose file and Dockerfile for an application . The container for MongoDB and Flask are working fine individually, but when I try to run them together, I do not get any response on the localhost, There are no error messages in the logs or the containers
Curl in the system gives this :
$ curl -i http://127.0.0.1:5000
curl: (7) Failed to connect to 127.0.0.1 port 5000: Connection refused
Can anyone suggest how do I debug this ??
**Only backend network is functional
[
{
"Name": "mlspace_backend",
"Id": "e7e37cad0058330c99c55ffea2b98281e0c6526763e34550db24431b30030b77",
"Created": "2022-05-15T22:52:25.0281001+05:30",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": null,
"Config": [
{
"Subnet": "172.20.0.0/16",
"Gateway": "172.20.0.1"
}
]
},
"Internal": false,
"Attachable": true,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {
"12c50f5f70d18b4c7ffc076177b59ff063a8ff81c4926c8cae0bf9e74dc2fc83": {
"Name": "mlspace_mongodb_1",
"EndpointID": "8278f672d9211aec9b539e14ae4eeea5e8f7aaef95448f44aab7ec1a8c61bb0b",
"MacAddress": "02:42:ac:14:00:02",
"IPv4Address": "172.20.0.2/16",
"IPv6Address": ""
},
"75cde7a34d6b3c4517c536a06349579c6c39090a93a017b2c280d987701ed0cf": {
"Name": "mlspace_flaskblog_1",
"EndpointID": "20489de8841d937f01768170a89f74c37ed049d241b096c8de8424c51e58704c",
"MacAddress": "02:42:ac:14:00:03",
"IPv4Address": "172.20.0.3/16",
"IPv6Address": ""
}
},
"Options": {},
"Labels": {
"com.docker.compose.network": "backend",
"com.docker.compose.project": "mlspace",
"com.docker.compose.version": "1.23.2"
}
}
]
I checked the logs of the containers. no errors found, flask engine seem to be running but the site wont run , even curl won't given any output