Entrypoint not found when deployed to Fargate. Locally works

Question

I have the following Dockerfile, currently working locally in my device:

FROM python:3.7-slim-buster

WORKDIR /app

COPY . /app

VOLUME /app

RUN chmod +x /app/cat/sitemap_download.py

COPY entrypoint.sh /app/entrypoint.sh

RUN chmod +x /app/entrypoint.sh

ARG VERSION=3.7.4

RUN apt update && \
       apt install -y bash wget && \
       wget -O /tmp/nordrepo.deb https://repo.nordvpn.com/deb/nordvpn/debian/pool/main/nordvpn-release_1.0.0_all.deb && \
       apt install -y /tmp/nordrepo.deb && \
       apt update && \
       apt install -y nordvpn=$VERSION && \
       apt remove -y wget nordvpn-release

RUN apt-get clean \
    && apt-get -y update
RUN apt-get -y install python3-dev \
    python3-psycopg2 \
    && apt-get -y install build-essential

RUN pip install --upgrade pip

RUN pip install -r cat/requirements.txt

RUN pip install awscli

ENTRYPOINT ["sh", "-c", "./entrypoint.sh"]

But when I deploy it to Fargate, the container stops before reaching the steady state with:

sh: 1: ./entrypoint.sh: not found

Edit: Adding entrypoint.sh file for clarification:

#!/bin/env sh
# start process, but it should exit once the file is in S3
/app/cat/sitemap_download.py
# Once the process is done, we are good to scale down the service
aws ecs update-service --cluster cluster_name --region eu-west-1 --service service-name --desired-count 0

I have tried modifying ENTRYPOINT to use it as exec form, or with full path but always get the same issue. Any ideas on what am I doing wrong?

Not su what do you mean, sorry. The entrypoint.sh is a script in the docker container that runs when the container is launched. If I put the python script instead (ENTRYPOINT/app/cat/sitemap_download.py) the script is found and the container starts, for example. — Arehandoro, Oct 06 '20 at 09:49
did you try to simply write `ENTRYPOINT ["/app/entrypoint.sh"]`? — Stefano, Oct 06 '20 at 09:55
Yep, as stated in the post trying full path return the same issue. Works locally but not on Fargate. — Arehandoro, Oct 06 '20 at 09:56
if it works locally then there's something wrong in how you create and start the container. — Stefano, Oct 06 '20 at 09:59
How are you running it locally? (I suspect the `VOLUME` line is causing problems and you can just delete it, but I'm not sure it would run locally.) — David Maze, Oct 06 '20 at 11:36
@Stefano That same container, launched in the exact same way, when having ```ENTRYPOINT ["sh", "-c", "/app/cat/sitemap_download.py"]``` works fine, both locally and in Fargate. But I think you're right, I have changed the entrypoint.sh shebang from ```#!/bin/bash``` to ```#!bin/env sh``` and I get the same error locally now. — Arehandoro, Oct 06 '20 at 11:37
@Stefano ```docker run $container_id``` locally. Via Cloudformation for Fargate. — Arehandoro, Oct 06 '20 at 12:47

score 1 · Accepted Answer · answered Oct 06 '20 at 20:07

I've managed to fix it now.

Changing the Dockerfile to look as follows solves the issue:

COPY . /app

VOLUME /app

RUN chmod +x /app/cat/sitemap_download.py

COPY entrypoint.sh /app/entrypoint.sh

RUN chmod +x /app/entrypoint.sh

ARG VERSION=3.7.4

RUN apt update && \
       apt install -y bash wget && \
       wget -O /tmp/nordrepo.deb https://repo.nordvpn.com/deb/nordvpn/debian/pool/main/nordvpn-release_1.0.0_all.deb && \
       apt install -y /tmp/nordrepo.deb && \
       apt update && \
       apt install -y nordvpn=$VERSION && \
       apt remove -y wget nordvpn-release

RUN apt-get clean \
    && apt-get -y update
RUN apt-get -y install python3-dev \
    python3-psycopg2 \
    && apt-get -y install build-essential

RUN pip install --upgrade pip

RUN pip install -r cat/requirements.txt

RUN pip install awscli

ENTRYPOINT ["/bin/bash"]
CMD ["./entrypoint.sh"]

I tried this after reading: What is the difference between CMD and ENTRYPOINT in a Dockerfile?

I believe this syntax fixes it because with entrypoint I'm indicating bash to be run at start, and then passing the script as parameter.

Entrypoint not found when deployed to Fargate. Locally works

1 Answers1