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Run shell command after Gunicorn service starts in Docker container

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0

I'm running a simple Python Flask app using Gunicorn. I want to start the Gunicorn service then run a custom shell script after the service is up.

Something like this:

FROM python:3.6.5-slim

RUN apt-get update 
 && apt-get clean 
 && apt-get install -qq -y git build-essential libpq-dev --no-install-recommends 
 && rm -rf /var/lib/apt/lists/*

WORKDIR /app

COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt

COPY . .

CMD ["entrypoint.sh"]

With the objective being to run my_custom_script.sh after the Gunicorn service starts (currently will not run):

#!/bin/sh

echo "Waiting for postgres..."
while ! nc -z postgres 5432; do
 sleep 0.1
done

echo "PostgreSQL started"
gunicorn -b 0.0.0.0:5000 manage:app

bash my_custom_script.sh

The script just builds the databases, runs some tests and adds some fact data.

python docker gunicorn

share|improve this question

asked Mar 28 at 7:28

Jason StrimpelJason Strimpel

4,9771212 gold badges5252 silver badges8585 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  just to clarify something, using gunicorn -b 0.0.0.0:5000 manage:app & doesn't work?
  
  – Arne
  Mar 28 at 7:54
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  gunicorn -b 0.0.0.0:5000 manage:app is a long running process (it's the webserver) so never returns an exit code
  
  – Jason Strimpel
  Mar 28 at 7:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That's why I added an ampersand at the end: stackoverflow.com/questions/44222883/…
  
  – Arne
  Mar 28 at 8:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you add an ampersand at the end of a command means, that it will be started in a subshell and the original process will continue with the next command. This will work. But it is a bad idea, because your gunicorn server will not be pid 1 in the container anymore. This will cause problems: For example it will not be possible to shut down the server in an orderly fashion.
  
  – Carl Düvel
  Mar 28 at 8:03
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If there are steps needed in preparation: They can be run before in the script. If you want to test the application after it has been started - that would need to be done outside of the container.
  
  – Carl Düvel
  Mar 28 at 8:11
  

  
  
  
  

 | 
show 4 more comments

0

I'm running a simple Python Flask app using Gunicorn. I want to start the Gunicorn service then run a custom shell script after the service is up.

Something like this:

FROM python:3.6.5-slim

RUN apt-get update 
 && apt-get clean 
 && apt-get install -qq -y git build-essential libpq-dev --no-install-recommends 
 && rm -rf /var/lib/apt/lists/*

WORKDIR /app

COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt

COPY . .

CMD ["entrypoint.sh"]

With the objective being to run my_custom_script.sh after the Gunicorn service starts (currently will not run):

#!/bin/sh

echo "Waiting for postgres..."
while ! nc -z postgres 5432; do
 sleep 0.1
done

echo "PostgreSQL started"
gunicorn -b 0.0.0.0:5000 manage:app

bash my_custom_script.sh

The script just builds the databases, runs some tests and adds some fact data.

python docker gunicorn

share|improve this question

asked Mar 28 at 7:28

Jason StrimpelJason Strimpel

4,9771212 gold badges5252 silver badges8585 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  just to clarify something, using gunicorn -b 0.0.0.0:5000 manage:app & doesn't work?
  
  – Arne
  Mar 28 at 7:54
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  gunicorn -b 0.0.0.0:5000 manage:app is a long running process (it's the webserver) so never returns an exit code
  
  – Jason Strimpel
  Mar 28 at 7:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That's why I added an ampersand at the end: stackoverflow.com/questions/44222883/…
  
  – Arne
  Mar 28 at 8:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you add an ampersand at the end of a command means, that it will be started in a subshell and the original process will continue with the next command. This will work. But it is a bad idea, because your gunicorn server will not be pid 1 in the container anymore. This will cause problems: For example it will not be possible to shut down the server in an orderly fashion.
  
  – Carl Düvel
  Mar 28 at 8:03
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If there are steps needed in preparation: They can be run before in the script. If you want to test the application after it has been started - that would need to be done outside of the container.
  
  – Carl Düvel
  Mar 28 at 8:11
  

  
  
  
  

 | 
show 4 more comments

I'm running a simple Python Flask app using Gunicorn. I want to start the Gunicorn service then run a custom shell script after the service is up.

Something like this:

FROM python:3.6.5-slim

RUN apt-get update 
 && apt-get clean 
 && apt-get install -qq -y git build-essential libpq-dev --no-install-recommends 
 && rm -rf /var/lib/apt/lists/*

WORKDIR /app

COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt

COPY . .

CMD ["entrypoint.sh"]

With the objective being to run my_custom_script.sh after the Gunicorn service starts (currently will not run):

#!/bin/sh

echo "Waiting for postgres..."
while ! nc -z postgres 5432; do
 sleep 0.1
done

echo "PostgreSQL started"
gunicorn -b 0.0.0.0:5000 manage:app

bash my_custom_script.sh

The script just builds the databases, runs some tests and adds some fact data.

python docker gunicorn

share|improve this question

asked Mar 28 at 7:28

Jason StrimpelJason Strimpel

4,9771212 gold badges5252 silver badges8585 bronze badges

FROM python:3.6.5-slim

RUN apt-get update 
 && apt-get clean 
 && apt-get install -qq -y git build-essential libpq-dev --no-install-recommends 
 && rm -rf /var/lib/apt/lists/*

WORKDIR /app

COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt

COPY . .

CMD ["entrypoint.sh"]

#!/bin/sh

echo "Waiting for postgres..."
while ! nc -z postgres 5432; do
 sleep 0.1
done

echo "PostgreSQL started"
gunicorn -b 0.0.0.0:5000 manage:app

bash my_custom_script.sh

share|improve this question

asked Mar 28 at 7:28

Jason StrimpelJason Strimpel

4,9771212 gold badges5252 silver badges8585 bronze badges

share|improve this question

asked Mar 28 at 7:28

Jason StrimpelJason Strimpel

4,9771212 gold badges5252 silver badges8585 bronze badges

asked Mar 28 at 7:28

Jason StrimpelJason Strimpel

4,9771212 gold badges5252 silver badges8585 bronze badges

asked Mar 28 at 7:28

Jason StrimpelJason Strimpel

4,9771212 gold badges5252 silver badges8585 bronze badges