docker-compose up command not responding - docker

I am using Ubuntu and tried to run Django with Docker.
When I give docker-compose up command it give below output
Starting aug6_web_1 ... done
Attaching to aug6_web_1
web_1 | Watching for file changes with StatReloader
and does not print anything else ... for almost 20 min now.
Here is my docker-compose.yml:
version: '3'
services:
web:
build:
context: ./
command: python manage.py runserver 127.0.0.0:8000
volumes:
- .:/AUG6
ports:
- '8000:8000'
And my Dockerfile:
FROM python:3
ENV PYTHONBUFFERED 1
RUN mkdir /AUG6
WORKDIR /AUG6
COPY /requirements.txt /AUG6/
RUN pip install -r requirements.txt
COPY . /AUG6/
Very first day of learning Docker, excuse if any mistakes

docker-compose up will not terminate as long as the containers are running.
If you want it to start the containers and then terminate, use docker-compose up -d.
Check the docker-compose manual.
EDIT 1:
I just spotted a mistake in your runserver command:
You have python manage.py runserver 127.0.0.0:8000 but it should be python manage.py runserver 127.0.0.1:8000.
You can remove the IP:PORT completely, as you use the defaults. Check the docs.

Related

How to add docker run param to docker compose file?

I am able to run my application with the following command:
docker run --rm -p 4000:4000 myapp:latest python3.8 -m pipenv run flask run -h 0.0.0.0
I am trying to write a docker-compose file so that I can bringup the app using
docker-compose up. This is not working. How do "add" the docker run params to the docker-compose file?
version: '3'
services:
web:
build: .
ports:
- "4000:4000"
volumes:
- .:/code
You need to use command to specify this.
version: '3'
services:
web:
build: .
ports:
- '4000: 4000'
image: myapp:latest
command: 'python3.8 -m pipenv run flask run -h 0.0.0.0'
volumes:
- .:/code
You should use CMD in your Dockerfile to specify this. Since you'll want to specify this every time you run a container based on the image, there's no reason to want to specify it manually when you run the image.
CMD python3.8 -m pipenv run flask run -h 0.0.0.0
Within the context of a Docker container, it's typical to install packages into the "system" Python: it's already isolated from the host Python by virtue of being in a Docker container, and the setup to use a virtual environment is a little bit tricky. That gets rid of the need to run pipenv run.
FROM python:3.8
WORKDIR /code
COPY Pipfile Pipfile.lock .
RUN pipenv install --deploy --system
COPY . .
CMD flask run -h 0.0.0.0
Since the /code directory is already in your image, you can actually make your docker-compose.yml shorter by removing the unnecessary bind mount
version: '3'
services:
web:
build: .
ports:
- "4000:4000"
# no volumes:

Docker does not build and run first service when there are two services in docker-compose

docker-compose up -d works fine when I have only the postgres service in the docker-compose.yml code below. But once I add the python service, the postgres container is never run even though its image is built. docker container ls -a shows that it does not exist.
version: '3'
services:
postgres:
build:
context: .
dockerfile: Dockerfile.postgres
restart: always
container_name: test_postgres
ports:
- "5431:5432"
# Once this python service is added, the postgres does not run.
python:
depends_on:
- postgres
build:
context: .
dockerfile: Dockerfile.python
restart: on-failure:10
container_name: test_python
ports:
- "8001:8000"
I haven't been able to find clear information on why this should be. Some solutions mention that version 3 doesn't use depends_on anymore. I thought this might be a possible issue so I removed it and added restart: on-failure:10 but it made no difference.
If I run docker-compose up -d with just the postgres service in it first, then add the python service into the same docker-compose.yml file and run it again, both images are built and containers run properly.
Not sure if necessary but here are the Dockerfiles for the services:
Dockerfile.postgres:
FROM postgres
WORKDIR /docker-entrypoint-initdb.d
ENV POSTGRES_DB test_postgres
ENV POSTGRES_PASSWORD 1234
COPY init.sql /docker-entrypoint-initdb.d
EXPOSE 5432
Dockerfile.python:
FROM python:latest
RUN mkdir /code
WORKDIR /code
COPY ./backend/ /code
RUN pip install --upgrade pip
RUN pip install -r requirements.txt
RUN python manage.py migrate
RUN python manage.py loaddata customers
EXPOSE 8000
CMD python manage.py runserver 0.0.0.0:8000
What am I doing wrong?

Can't connect to docker endpoint even with docker-compose up successful

I am trying to learn how to containerize my flask api with docker. I am very new to docker, but from my understanding, I was able to build/update it. When I navigate to my route I get site can't be reached.
Any help would be greatly appreciated. Thank you.
Here is my yml file:
version: "3.6"
services:
users:
build:
context: ./services/users
dockerfile: Dockerfile-dev
volumes:
- "./services/users:/usr/src/app"
ports:
- 5001:5000
environment:
- FLASK_APP=project/__init__.py
- FLASK_ENV=development
- APP_SETTINGS=project.config.DevelopmentConfig
here is my dockerfile:
FROM python:3.6.5-alpine
WORKDIR /usr/src/app
COPY ./requirements.txt /usr/src/app/requirements.txt
RUN pip install -r requirements.txt
COPY . /usr/src/app
CMD python manage.py -h 0.0.0.0
and here is my powershell command and output:
docker-compose -f docker-compose-dev.yml up -d --build
upon further diagnosis I found this from the ps command
I however cannot find in docker documentation what state of exit 2 means. Unless that is bash for misuse of shell builtin: http://www.tldp.org/LDP/abs/html/exitcodes.html. In that case I really don't know my problem and would appreciate any help!
Edit 3:
upon reading some github threads removing the -d flag from my command showed more information but it is still cryptic if anyone has an explanation for it:
I guess new flask versions doesn't support -h anymore, try with --host -
Change CMD statement in Dockerfile to -
CMD python manage.py runserver --host 0.0.0.0
Ref - https://flask-script.readthedocs.io/en/latest/

Docker - run image from docker-compose

I have set up a docker-compose.yml file that runs a web service along with postgres.
It works nicely when I run it with docker-compose up.
docker-compose.yml:
version: '3'
services:
db:
image: postgres
web:
build: .
command: python manage.py runserver 0.0.0.0:8000
volumes:
- .:/code
ports:
- "8000:8000"
depends_on:
- db
Dockerfile:
FROM python:3
RUN mkdir /code
WORKDIR /code
ADD requirements.txt /code/
RUN pip install -r requirements.txt
ADD . /code/
CMD ["python", "manage.py", "runserver"]
Is there any way to construct an image out of the services?
I tried it with docker-compose build, but running the created image simply freezes the terminal.
Thanks!
docker-compose is a container orchestration tool, albeit a simple one , and not a bundler of multiple images and preferences into one. In fact, such a thing does not even exists.
What happens when you run docker-compose up is that it effectively runs docker-compose build for those images that need to be built, web in your example, and then effectively replaces the build: . with image: web and executes the configuration as defined by the compose file.
So if you were to run docker-compose build manually and wanted to run the same configuration you have in the compose file manually, you would need to something along the lines of (in order)
run docker-compose build or docker build -t web . to build the web image
run docker run --name db postgres
run docker run --name web -v .:/code -p 8000:8000 web python manage.py runserver 0.0.0.0:8000

Docker on Windows 10- D: drive not shared

I have a Django rest project which I am dockerizing.
My Dockerfile:
FROM python:3
ENV PYTHONUNBUFFERED 1
RUN mkdir /code
WORKDIR /code
COPY . /code/
RUN pip install -r requirements.txt
And docker-compose:
version: '3'
services:
web:
build: .
command: python manage.py runserver 0.0.0.0:8000
volumes:
- .:/code
ports:
- "8000:8000"
I first ran: docker-compose build which was successful. I then ran: docker-compose up which is giving me error as ERROR: for web Cannot create container for service web: D: drive is not shared. Please share it in Docker for Windows Settings
How to fix this?
You just need to activate a drive for sharing in the settings.
Docker Desktop Settings

Resources