I will be using the example of Factorial application<\/a>\u00a0– a simple web application created by Qxf2 that can be used as a QA interview tool.<\/p>\n Note: Skip to section 3 if you already have a Docker image of your website.<\/p>\n First, we need a Docker image that will be used while creating the Kubernetes deployment. Below I have listed the steps to create the Docker file from scratch.<\/p>\n I have Windows Home version, so had 2 options to use Docker : Docker Toolbox<\/a> or create a Linux AWS instance (free one) and install docker<\/a> on it. I used the later approach.\u00a0Images that are built using Docker are portable across operating systems.<\/p>\n Building the Docker file includes the following steps:<\/p>\n a. Installing essential tools – We will need python, pip and git<\/span><\/p>\n b. Clone the repository. It is present at\u00a0https:\/\/github.com\/qxf2\/qa-interview-web-application<\/a> c. Putting it all together The final docker file will look like this:<\/p>\n Save the above final file as Dockerfile in your working or any other directory.<\/p>\n a. Build the docker image. Make sure you are in the same directory where the Dockerfile is present.<\/span><\/p>\n b. Upload the docker image to docker hub<\/span> c. push the image to the hub<\/p>\n<\/div>\n Applications need to be packaged into one of the supported container formats in order to be deployed on Kubernetes. We will now create a kubernetes pod where we will deploy our docker image. A pod is the basic execution unit of a Kubernetes application and is a group of one or more containers tied together for the purposes of administration and networking. A Kubernetes Deployment checks on the health of your Pod and restarts the pod\u2019s Container if it terminates. Deployments are the recommended way to manage the creation and scaling of Pods.<\/p>\n a. Installation and set up on Windows A Hypervisor is also required. I downloaded VirtualBox<\/a> Use the following command to start up minikube:<\/p>\n Run the below command to check the status of cluster:<\/p>\n b. Verify kubectl is installed c. Create a Kubernetes deployment using the docker image<\/p>\n d. Check if the pod is running<\/p>\n This means that the website is running inside the pod.<\/span><\/p>\n e.\u00a0To test the running server (pod), port-forward the pod port 6464 to localhost port 8081 (or any other port of your choice)<\/p>\n f. Test by running<\/p>\n
\nCreating a Docker image for the website<\/span><\/h4>\n
\nYou can directly download the Docker image for the Factorial app from our Docker Hub repository using the following command:<\/p>\ndocker pull sravantit25\/factorial-qxf2:0.1<\/pre>\n
RUN apt-get update && apt-get install -y \\\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0curl \\\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0python \\\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0python-setuptools \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0python-pip git<\/pre>\n
\n<\/span><\/p>\nRUN git clone https:\/\/github.com\/qxf2\/qa-interview-web-application.git<\/pre>\n
\nWORKDIR helps to define the working directory we want to run the command from.\u00a0Using CMD will start the server after the docker image is completely built.
\n<\/span><\/p>\nWORKDIR qa-interview-web-application\r\npip install -r requirements.txt\r\nCMD python qa_interview.py<\/pre>\n
#Docker file for Factorial application\r\nFROM ubuntu\r\nMAINTAINER Qxf2 Services\r\n\r\n#Install essential tools\r\nRUN apt-get update && apt-get install -y \\\r\ncurl \\\r\npython \\\r\npython-setuptools \\\r\npython-pip git\r\n\r\n#Clone the Factorial application\r\nRUN git clone https:\/\/github.com\/qxf2\/qa-interview-web-application.git\r\n\r\nWORKDIR qa-interview-web-application\r\nRUN pip install -r requirements.txt\r\n\r\n#Start the server\r\nCMD python qa_interview.py<\/pre>\n
\nBuild the docker image and upload it to docker hub<\/h4>\n
docker build .<\/pre>\n
\nI created a repo in my account and used this repo to tag the docker image.<\/p>\ndocker tag 634a7b88de75 sravantit25\/factorial-qxf2:0.1<\/pre>\n
docker push sravantit25\/factorial-qxf2<\/pre>\n
\nDeploy the website docker image on Kubernetes<\/h4>\n
\nWe will use minikube, which makes it easy to run Kubernetes locally. It runs a\u00a0single-node Kubernetes cluster in a virtual machine on your computer.
\nInstall Minikube on Windows using Chocolatey (run as an administrator):<\/p>\nchoco install minikube<\/pre>\n
\n<\/span><\/p>\nminikube start --driver=VirtualBox<\/pre>\n
minikube status\r\nhost: Running\r\nkubelet: Running\r\napiserver: Running\r\nkubeconfig: Configured<\/pre>\n
\nOnce the minikube is successfully configured, we can use kubectl, the Kubernetes command-line tool. It allows to run commands against Kubernetes clusters.
\nUse the following command to verify if kubectl is working<\/p>\n$kubectl version\r\nClient Version: version.Info{Major:\"1\", Minor:\"17\", GitVersion:\"v1.17.1\", GitCommit:\"d224476cd0730baca2b6e357d144171ed74192d6\", GitTreeState:\"clean\", BuildDate:\"2020-01-14T21:04:32Z\", GoVersion:\"go1.13.5\", Compiler:\"gc\", Platform:\"windows\/amd64\"}\r\nServer Version: version.Info{Major:\"1\", Minor:\"17\", GitVersion:\"v1.17.3\", GitCommit:\"06ad960bfd03b39c8310aaf92d1e7c12ce618213\", GitTreeState:\"clean\", BuildDate:\"2020-02-11T18:07:13Z\", GoVersion:\"go1.13.6\", Compiler:\"gc\", Platform:\"linux\/amd64\"}<\/pre>\n$ kubectl create deployment qxf2-factorial-app --image=sravantit25\/factorial-qxf2:0.1\r\ndeployment.apps\/qxf2-factorial-app created<\/pre>\n<\/div>\n
$ kubectl get pod\r\nNAME READY STATUS RESTARTS AGE\r\nqxf2-factorial-app-58dcdbc97f-5zzt5 1\/1 Running 0 3m20s<\/pre>\n
$ kubectl port-forward qxf2-factorial-app-58dcdbc97f-5zzt5 8081:6464\r\nForwarding from 127.0.0.1:8081 > 6464\r\nForwarding from [::1]:8081 > 6464<\/pre>\n
http:\/\/localhost:8081\/<\/pre>\n
![\"\"](\"https:\/\/qxf2.com\/blog\/wp-content\/uploads\/2020\/04\/Factorial_app.png\")
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