Kubernetes & Cloud - agile-solution

What is Cloud Native computing

Almost everything you read on REST and MicroServices Architecture MSA is closely related to Cloud Native software development and computing. Let's first get the definition right.

"Cloud-native technologies are used to develop applications built as services(MSA), packaged in containers, deployed and managed on elastic infrastructure (like Kubernetes) through agile DevOps processes and continuous delivery workflows".

Read about the 10 KEY ATTRIBUTES OF CLOUD-NATIVE APPLICATIONS

About 12-Factor Principles

The Twelve-Factor App Methodology is suggested by developers for smoothly working and delivering Software as a Service (SaaS) Applications or Web Apps with a focus on Microservices.

Running Spring Boot GraalVM Native Images with Docker

All those Micronaut, Quarkus.io & Co. frameworks sound great! But Spring is the undisputed forerunner in Enterprise Java. Wouldn't it be great to combine Spring Boot with the benefits of GraalVM?!

Skaffold

If a developer has to wait for 30 minutes for their code to compile, that code lacks velocity. So, the developer experience is awful, and he/she is very frustrated. Skaffold automates the workflow for building, pushing and deploying applications into a Kubernetes cluster. With Skaffold, developers can iterate on application source code locally while having it continually updated and ready for validation or testing in their local or remote Kubernetes clusters. Developers can run Skaffold as a background process while they are developing their code.

Spring on Kubernetes

When it comes to building Java apps that run in the cloud, Spring and Spring Boot are clear favorites. It is also increasingly clear that technologies such as Docker and Kubernetes play an important role in the Spring community.

Developing SpringBoot on Kubernetes

In the cloud-native world, where microservices are developed, distributed, and operated, the operational burden becomes more complicated as the services become smaller and smaller. Fortunately, there are technologies available to vastly reduce both the time and costs associated with development and operations.

SpringBoot and ISTIO

Istio is currently the leading solution for building service mesh on Kubernetes. Thanks to Istio you can take control of a communication process between microservices. It also lets you secure and observe your services. Spring Boot is still the most popular JVM framework for building microservice applications.

SpringBoot OIDC flows

About Skaffold

Skaffold is a simple command-line tool that is able to handle the workflow for building, pushing and deploying your Java application on Kubernetes. It saves a lot of developer time by automating most of the work from source code to the deployment.

Jib, is dedicated only for Java applications. It allows you to build optimized Docker and OCI images for your Java applications without a Docker daemon. It is available as Maven of Gradle plugin, or just as a Java library. With Jib you don't need to maintain a Dockerfile or even run a Docker daemon.

About JIB Java Image Builder

Jib is a container tool that builds, pushes the Docker images of Java applications without a Docker daemon. Means, you don't have to have a docker daemon installed on your machine!

Distroless Docker images and JIB

"Distroless" images contain only your application and its runtime dependencies. They do not contain package managers, shells or any other programs you would expect to find in a standard Linux distribution.

SpringBoot OIDC, Keycloak, ISTIO

Keycloak is an open source Identity and Access Management solution targeted towards modern applications and services.

Keycloak offers features such as Single-Sign-On (SSO), Identity Brokering and Social Login, User Federation, Client Adapters, an Admin Console, and an Account Management Console. To learn more about Keycloak, please visit the official page.

Kustomize

Kustomize is a standalone configuration management tool. The basic idea is to create a collection of these configuration files as a ‘base’ configuration and apply ‘overlays’ to change them by the environment. Kustomize has been integrated with kubectl.

Writing Kubernetes Operators in Java

Java is no doubt one of the most popular programming languages in the world but it's been difficult for a period time for those non-Golang developers to build up their customized controller/operator due to the lack of library resources in the community. In the world of Golang, there're already some excellent controller frameworks. Driven by the emerging need of further integration into the platform of Kubernetes, we not only ported many essential toolings from the Golang SDK into the kubernetes Java SDK including informers, work-queues, leader-elections, etc. but also developed a controller-builder SDK which wires up everything into a runnable controller without hiccups.