Node.js app in a docker container not reachable over Internet "Connection refused" [duplicate]

Question

I am struggling for a quite some time making a node.js app to be accessible over Internet. The docker container is running on a port 9000. The host machine is an Oracle Linux virtual machine one, on the Oracle Cloud. I have enabled the port 9000 there.

In the container I run the node.js app with:

sh-4.2# node index.js
Starting application
Initializing database module
libDir = /usr/lib/oracle/19.3/client64/lib
Initializing web server module
Web server listening on Host:0.0.0.0, Port:9000

Check the docker container process from within the Oracle Linux host: docker ps

CONTAINER ID        IMAGE                          COMMAND             CREATED              STATUS              PORTS               NAMES
8504964aa23c        227d64c853db/domaevid-server   "sh"                About a minute ago   Up About a minute   9000/tcp            mystifying_babbage

And testing the connection on the host is giving back the error:

[opc@instance-20210318-1902 ~]$ curl http://public.ip:9000/api/home
curl: (7) Failed connect to public.ip:9000; Connection refused

The content of the Dockerfile:

FROM oraclelinux:7-slim

WORKDIR /usr/src/app
COPY package*.json ./

RUN  yum -y install oracle-release-el7 && \
    yum -y install oracle-instantclient19.3-basiclite && \
    yum -y install oracle-nodejs-release-el7 && \
    yum-config-manager --disable ol7_developer_EPEL && \
    yum install vim-enhanced -y && \ 
    yum -y install nodejs && \
    npm install && \
    rm -rf /var/cache/yum
RUN echo "export xxx" >> ~/.bashrc && \
    echo "export xxx" >> ~/.bashrc && \
    echo "export xxx" >> ~/.bashrc && \
    echo "export xxx" >> ~/.bashrc && \
    echo "export xxx" >> ~/.bashrc
RUN source ~/.bashrc 
COPY /_docker/ORACLE/NETWORK/ADMIN/* /usr/lib/oracle/19.3/client64/lib/network/admin 

COPY . .

EXPOSE 9000
CMD [ "node", "index.js" ]

What else should be done so the node.js app is reachable over Internet?

Kind regards, Dime