CODEWITHSUNDEEP
dockerdocker-compose
Carolyn Cordeiro
Carolyn Cordeiro

Reputation: 1905

How to Make docker compose status running,currently it stops after docker-compose up

I am trying to make my docker-compose status up and running by trying below docker-compose yaml, but seems when I execute docker-compose ps , I see the container is stopped, how do I make my docker-compose up and running for infinite times

docker-compose.yml

  version: "3.7"
  services:
    execute:
      command: tail -f /dev/null
      image: abc/SREBlackBoxTester
      labels:
         - mylabelOne= "SREBlackBoxTester"
      volumes:
         - type: volume
           source: AWS_CREDENTIALS_FOLDER
           target: /home/scar/.aws
           source: SCAR_CONFIG_FOLDER
           target: /home/scar/.scar
           volume:
             nocopy: true
     command: bash -c "while true; do sleep 10; done"

    volumes:
        AWS_CREDENTIALS_FOLDER:
        SCAR_CONFIG_FOLDER:

Here goes Docker file

 FROM python:3.8-alpine

 RUN apk add zip unzip
 RUN addgroup --system scar && adduser -S -G scar scar
 USER scar

 WORKDIR /home/scar/
  RUN mkdir /home/scar/.scar && \
  mkdir /home/scar/.aws && \
  echo '[default]' > /home/scar/.aws/config && \
  echo 'region=us-west-2' >> /home/scar/.aws/config && \
  echo '[default]' > /home/scar/.aws/credentials && \
  echo 'aws_access_key_id=AX' >> /home/scar/.aws/credentials && \
  echo 'aws_secret_access_key=wctKx/KdRCSQ' >> /home/scar/.aws/credentials

ENV PATH=/home/scar/.local/bin:$PATH
ENV SCAR_LOG_PATH=/home/scar/.scar/

RUN pip3 install scar --user
CMD scar  init -n SREBlack -i image 


ENTRYPOINT /bin/sh

The output of docker ps -a 

$ docker ps -a
CONTAINER ID        IMAGE                   COMMAND                      

CREATED                  STATUS                              PORTS               
NAMES
f5af892b3b19        abc/image   "/bin/sh -c /bin/sh …"      
Less than a second ago   Exited (0) Less than a second ago                       
clever_wescoff

Upvotes: 1

Views: 1271

Answers (3)

David Maze
David Maze

Reputation: 158908

In general a Docker container should be set up to run a specific program. In most cases the default shouldn't be an interactive shell or an artificial tail -f /dev/null command. In your example nothing is actually running the program you install. You should change the end of the Dockerfile to actually run it

FROM python:3.8-alpine
RUN pip install scar
CMD scar

and provide details like credentials through volumes: mounts. (Consider whether embedding your AWS credentials into a Docker image has compromised them; anyone who has the image can do anything they're allowed to according to your IAM permissions.)

In the example you show the combination of ENTRYPOINT and command: leads to a non-sensical command line. The Dockerfile documentation on Understand how CMD and ENTRYPOINT interact has technical details. Since you specified a shell-format ENTRYPOINT it gets wrapped in sh -c, and then the command: from the docker-compose.yml file gets appended to that. You wind up with something like

/bin/sh -c '/bin/sh' tail -f /dev/null

which just launches a shell (the "tail ..." is ignored), and since there's no input, it immediately exits.

In general Docker Compose is more oriented to running long-running applications, like databases or Web servers. The SCAR documentation has an example of running the tool in Docker. For command-line tools like this, though, given the need to do things like manually push AWS credentials from the host into the container and to have root-equivalent permissions to run the tool at all, you might find it more convenient to run the tool directly on the host, maybe installed in a Python virtual environment.

Upvotes: 1

kooskoos
kooskoos

Reputation: 4859

docker-compose up -d

-d flag stands for detached mode

Upvotes: 0

Al-waleed Shihadeh
Al-waleed Shihadeh

Reputation: 2855

Your docker-compose file is setting two commands for the container 

 command: tail -f /dev/null

and (is bash already included in the docker image)

command: bash -c "while true; do sleep 10; done"

you only can use one per service and you need to make sure that the command does not exit.

can you provide the logs of the containers 

docker logs ${container_name}

Upvotes: 0

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