I am trying to dockerize a simple Python-Flask application but I am getting an error while running my container.
docker: Error response from daemon: OCI runtime create failed: container_linux.go:344: starting container process caused "exec: \"python\": executable file not found in $PATH": unknown.
Workdir on localhost:
/home/ubuntu/flask_web
- app.py
- Dockerfile
- requirements.txt
app.py
#flask_web/app.py
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello_world():
return 'Hey, we have Flask in a Docker container'
if __name__ == '__main__':
app.run(debug=True, host='0.0.0.0')
Dockerfile
FROM ubuntu:16.04
MAINTAINER xyz "xyz@gmail.com"
RUN apt-get update \
&& apt-get install -y software-properties-common vim \
&& add-apt-repository ppa:jonathonf/python-3.6 \
&& apt-get update -y \
&& apt-get install -y build-essential python3.6 python3.6-dev python3-pip python3.6-venv \
&& pip3 install --upgrade pip
# We copy just the requirements.txt first to leverage Docker cache
COPY ./requirements.txt /app/requirements.txt
WORKDIR /app
RUN pip install -r requirements.txt
COPY . /app
ENTRYPOINT [ "python" ]
CMD [ "app.py" ]
Commands:
docker build -t flask-test:latest .
docker run -p 5000:5000 flask-test
Expected : Flask web should run on port 5000
Actual Result:
docker: Error response from daemon: OCI runtime create failed: container_linux.go:344: starting container process caused "exec: \"python\": executable file not found in $PATH": unknown.
There is no /usr/bin/python in a docker image built by the code above. But there is /usr/bin/python3. So you could either use python3 directly as your ENTRYPOINT or create a symlink.
I was getting the same issue except that it was yelling some other number than 344
docker: Error response from daemon: OCI runtime create failed: container_linux.go:344: starting container process caused "exec: \"python\": executable file not found in $PATH": unknown.
and the docker file was
FROM ubuntu:20.04
RUN apt-get update -y
RUN apt-get install -y python3
RUN apt-get install -y python3-pip
COPY ./requirements.txt /app/requirements.txt
WORKDIR /app
RUN pip3 install -r requirements.txt
COPY . /app
ENTRYPOINT [ "python" ]
CMD [ "app.py" ]
I changed the line
ENTRYPOINT [ "python" ]
to ENTRYPOINT [ "python3" ]
Now it is working fine.
The reason for this was that above I had used Python3 so there was no candidate for Python rather there were for Python3.
RUN apt-get install -y python3
RUN apt-get install -y python3-pip