Continuous Delivery Pipeline for Deploying Microservices Based Scala Application on Kubernetes

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by Gursimran Singh | December 22, 2017 |  Categories -  Docker, Kubernetes, Microservices, Containers, Scala Continuous Delivery Pipeline for Deploying Microservices Based Scala Application on Kubernetes

Overview

Running Containers at any real-world scale requires container orchestration, and scheduling platform like Docker SwarmApache MesosAWS ECS but the most popular out of it is Kubernetes. Kubernetes is an open source system for automating deployment and management of containerised applications. 

In this post, We’ll share the process how you can Develop and Deploy Microservices based PHP Laravel Application on the Container Environment -  Docker and Kubernetes and adopt DevOps in existing PHP Applications.


Prerequisites For Deploying Laravel Application on Kubernetes

To follow this guide you need -

  • Kubernetes

It is an open source platform that automates container operations, and Minikube is best for testing Kubernetes.

  • Kubectl

Kubectl is command line interface to manage Kubernetes cluster either remotely or locally. To configure kubectl on your machine follow this link.

  • Shared Persistent Storage

Shared Persistent Storage is permanent storage that we can attach to the Kubernetes container so that we don`t lose our data even when container dies. We will be using GlusterFS as the persistent data store for Kubernetes container applications.

  • Scala Application Source Code

Scala Application Source Code is source code that we want to run inside a Kubernetes container.

  • DockerFile

Dockerfile contains a bunch of commands to build PHP Laravel application.

  • Container Registry

The Registry is an online image store for container images.

Below mentioned options are few most popular registries.


Writing a Dockerfile

At the time of writing this blog, I haven`t got any official image of Scala sbt so I decided to build a base image for Scala sbt. In this image, we are using OpenJDK 8 as a development environment and Scala sbt 0.13.

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Building Scala Base Image

The Below mentioned command will build your scala base container image.


Dockerfile (Application)

As Scala sbt don't have any official image of Docker container so we will be using above created image of Scala sbt as a base image for Scala applications.


Building Scala Application Image

The below-mentioned command will build your application container image.


Publishing Scala Application Container Image

Now we publish our Scala application container image on Private Docker Registry.

  • Login to Container Registry

  • Retag Container Images

  • Push Application container Images

Reference Link for Pull and Push to Quay.io docker registry.

Similarly, we can push or pull any container image to any of below-mentioned container registry like Docker Hub, AWS ECR, Private Docker Registry, Google Container Registry etc.


Creating Deployment files for Kubernetes

Deploying application on kubernetes with ease using deployment and service files either in JSON or YAML format.

  • Deployment File

Following Content is for “<name of application>.deployment.yml” file of python container application.

  • Service File

Following Content is for “<name of application>.service.yml” file of python container application.


Deploying Scala Application on Kubernetes

Scala Container Application can be deployed either by kubernetes Dashboard or Kubectl (Command line).

I`m explaining command line that you can use in production kubernetes cluster.

Now we have successfully deployed Scala Application on Kubernetes.


Verification

We can verify application deployment either by using Kubectl or Kubernetes Dashboard.

Below mentioned command will show you running pods of your application with status running/terminated/stop/created.

Result of above command

Result of Deploying Scala on Kubernetes


Testing

Get the External Node Port using the below mentioned command.External Node Port is in the range from 30000 to 65000.

Launch web Browser and open any of the below-mentioned URLs.

  • http://<kubernetes master ip address >: <application service port number>

  • http://<cluster ip address >: <application port number>

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Troubleshooting

  • Check Status of Pods.

  • Check Logs of Pods/Containers.

  • Check Service Port Status.

  • Check requirements/dependencies of application.


How Can XenonStack Help You?

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XenonStack Continuous Deployment Cloud Hosting Services lets you clone your production to staging cluster in less than a minute. Develop, Deploy and Manage your PHP Laravel Application on leading Cloud Service Providers - AWSMicrosoft AzureGoogle Cloud, and Container Environment - Kubernetes and Docker.

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