Greetings! Time for me to learn docker and docker-compose. I have heard that it’s similar to vagrant in functionality and much light weight. But never tried before. Let’s see how it unfolds.
First, I am installing it.
brew install docker
docker --version
Docker version 19.03.14, build 5eb3275Now, going to take a look on their official docs for intro: #1 https://docs.docker.com/get-started/
Great video actually: #2 https://youtu.be/iqqDU2crIEQ
My friend Gutsytechster also recommended me to watch following two videos. Again, these videos are introductory. So the idea is to solidify my basics.
Amazing! I understood the concept and need for both docker and docker-compose.
While watching the video I tried docker images and docker ps commands, but I got the error:
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?A probable fix is here: #3 https://stackoverflow.com/questions/44084846/cannot-connect-to-the-docker-daemon-on-macos
But I decided to install Docker for Mac Desktop itself -_- : #4 https://docs.docker.com/docker-for-mac/install/
Great! The installation also showed a default demo of Docker. And now docker CLI is working!! But the questions is where should I try to implement it?
Let’s do it on one of my personal project, that I have been using for all these experiments lately. That is Nickoscope: https://github.com/geekyshacklebolt/nickoscope
I would create a Dockerfile that copies my code into the image and then build it inside and probably start running it. Let’s do it.
Add required dunder check
# add this at the end of my "nickoscope.py" that is your main flask module
if __name__ == "__main__":
app.run(host="0.0.0.0", port="5001", debug=True)This is just so that I can run my flask module directly using python nickoscope.py and I won’t need to setup FLASK_APP env variable in this case.
My Dockerfile
FROM python:3.8-slim
COPY . .
# Install core dependencies
RUN apt-get update && apt-get install -y python3-pip
# Install requirements
RUN pip3 install -r requirements.txt
# Run flask applications
CMD ["python3", "nickoscope.py"]After saving it as “Dockerfile” in the project root. I did:
docker build -t nickoscope01 .docker run -dp 5001:5001 nickoscope01And my app was running fine on the browser. Some handy commands:
docker ps -a shows all the running image processes (containers)
docker stop <container name or id> to stop a running container
docker start <container name or id> to start a stopped container
docker rm <container id or name> to delete the process from log
docker rmi <image-id or image-name> to delete the docker image
My Docker-compose
I also tried writing a docker compose, although it wasn’t necessary as my task could be completed only using one container. But just for my learning purpose I tried writing a docker-compose.yml
version: "3.7"
services:
app:
build: /Users/shiva/path/to/project/nickoscope
ports:
- 5001:5001That’s it XD
docker-compose up -dAnd my app was running on the browser again!! To shutdown the docker-compose process. Just do it.
docker-compose downNow I am a little handy with docker, in future if something comes up that is associated with docker, then at least I won’t be blank.
Thanks for following up! Have a nice day!
