Getting started with docker and kubernetes

GETTING STARTED WITH DOCKER AND KUBERNETES HOW TO
GETTING STARTED WITH DOCKER AND KUBERNETES INSTALL
GETTING STARTED WITH DOCKER AND KUBERNETES CODE

Because you have a web application, you will create a service and a deployment.ДЇirst verify your kubectl is configured. You are finally ready to get the application running in Kubernetes. Now navigate to and you should see the вЂњHello form Python!вЂќ message. Run the following command to have Docker run the application in a container and map it to port 5001: docker run -p 5001:5000 hello-python The application is now containerized, which means it can now run in Docker and Kubernetes! Running in DockerД«efore jumping into Kubernetes, letвЂ™s verify it works in Docker. To verify the image was created, run the following command: docker image ls This will perform those seven steps listed above and create the image. Note: I'm using the :latest tag in this example, if you are not familiar with what it is you may want to read Docker: The latest Confusion.

Configure the starting command to use when the container starts.ДЄt your command line or shell, in the hello-python/app directory, build the image with the following command: docker build -f Dockerfile -t hello-python:latest.

Inform Docker the container listens on port 5000.

Run the pip installer (just like we did earlier) to pull the requirements into the image.

Copy the local directoryвЂ™s contents to that new folder into the image.

Set the working directory to that new app directory.

In the image, create a directory named app.

Get the official Python Base Image for version 3.7 from Docker Hub.

For this simple application, Docker is going to: This file is a set of instructions Docker will use to build the image. In the hello-python/app directory, create a file named Dockerfile with the following contents and save it: FROM python:3.7

GETTING STARTED WITH DOCKER AND KUBERNETES CODE

Now that you have verified the source code works, the first step in containerizing the application is to create a Dockerfile. This will start a development web server hosting your application, which you will be able to see by navigating to Because port 5000 is the default port for the development server, we didnвЂ™t need to specify it.

GETTING STARTED WITH DOCKER AND KUBERNETES INSTALL

Manually run the installer and application using the following commands: pip install -r requirements.txt Note: When you start writing more advanced Python, you'll find it's not always recommended to use pip install and may want to use virtualenv (or pyenv) to install your dependencies in a virtual environment. The requirements.txt file contains the list of packages needed by the main.py and will be used by pip to install the Flask library. You can learn more about Flask on the Flask website. If you look at the main.py file, youвЂ™ll see the application prints out a hello message. There are only two files in this directory. Use git to clone the repository to your local machine: git clone Д¬hange to the app directory: cd hello-python/app Otherwise, you can skip to the 'Create a Dockerfile' section. The sample application used is a very simple Flask web application if you want to test it locally, youвЂ™ll need Python installed.

In this section youвЂ™ll take some source code, verify it runs locally, and then create a Docker image of the application. A Kubernetes service - I'm using Docker Desktop with Kubernetes in this walkthrough, but you can use one of the others.Create a deployment and run the application in Kubernetes.Create an image and run the application in Docker.

Get the code and run the application locally.This walk-through assumes you are a developer or at least comfortable with the command line (preferably bash shell).

GETTING STARTED WITH DOCKER AND KUBERNETES HOW TO

In this blog youвЂ™ll walk through how to containerize an application and get it running in Kubernetes. Or maybe youвЂ™re getting started but still donвЂ™t know what you donвЂ™t know. So, you know you want to run your application in Kubernetes but donвЂ™t know where to start. Author: Jason Haley (Independent Consultant)

Getting started with docker and kubernetes