- Web Server running on port 5000 with host 0.0.0.0. For Web Server was used such python modules like: Flask, json, and BaseConverter from werkzeug.routing for using REGEX in app.route. It also returns "HTTP 200 OK" on URL "/healthcheck" (python), returns "HTTP 404" on other URLs. Then pushed to repo.
- To run the app, use this command:
python3 main.py. Then functionality was tested: Starting Server Before Docker Step:
Server response 200 status code:
Server response 404 status cod, to all other url requests:
- Dockerfile was created using python:3.8-slim-buster as a base image. I am exposing port 5000, to have the ability to access responses from server. Next, I am creating work folder and using COPY copy main.py, requirements.txt files, where first one will be used for running server; second one used for installing dependencies for image. In the end, used CMD to run app.py(everytime container starts it will start from this command, thanks to this app will run.). requirements.txt was created by this command
pip3 freeze | grep Flask >> requirements.txt, freeze output installed packages in requirements format, as I used only 1 external module(Flask), I am installing only that module.
FROM python:3.8-slim-buster
MAINTAINER Teranteks
EXPOSE 5000
RUN mkdir /app
WORKDIR /app
COPY ./main.py /app/app.py
COPY ./requirements.txt /app/requirements.txt
RUN pip3 install -r /app/requirements.txt
CMD [ "python3", "./app.py"]
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Then I created dockerhub repo for docker image, after that in console login in docker hub using
docker login, and enter Username, Password from dockerhub. Later, I built a docker image usingdocker build ./ -t teranteks/test_task_python_webserver:v1and named image with name of repo, set tag version1. -
The next step was to test the image. I created a container with this command
docker run -d --name python_app -p 5000:5000 teranteks/test_task_python_webserver:v1and made requests to test functionality of app.py. After success pushed it to dockerhub repodocker push teranteks/test_task_python_webserver:v1 -
I pulled image from dockerhub repo (It is public repo, check url: https://hub.docker.com/r/teranteks/test_task_python_webserver .). Run
docker run -d --name python_app -p 5000:5000 teranteks/test_task_python_webserver:v1command again and check, how everything works.
Docker Container/Images:
-
Create cluster by
minikube start --cpus=4 --memory=4gb --disk-size=20gb
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Then, I created a helm chart named "WebServer_Helm" with files like Chart.yaml, values.yaml and folder with autoscaling.yaml, deployment.yaml, service.yaml. As you can see, I set HorizontalPodAutoscaler, to decrease the chances of downtime (or minimize it).
-
Run command
helm install app WebServer_Helm/, and deployment, service, autoscaling is created by one command, because of Helm Chart.
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Here you can see working cluster, deployment etc...
