Kubernetes

Connect Stateful Workloads Across Kubernetes Clusters

Learn how, with a bit of creativity, we were able to utilize off-the-shelf functionality and components to set up lightweight cross-cluster communication for apps in a multitenant environment.

While this solution is applicable to a somewhat narrow use case, it does come with several important advantages, including shared-nothing architecture, low complexity, low operational burden, and high degree of isolation between tenants.

The Search for a Cloud-Native Database

A cloud-native database is one that is designed with cloud-native principles in mind, including scalability, elasticity, resiliency, observability, and automation.

As we’ve seen with Cassandra, automation is often the final milestone to be achieved, but running databases in Kubernetes can actually help us progress toward this goal of automation.

What’s next in the maturation of cloud-native databases? We’d love to hear your input as we continue to invent the future of this technology together.

A Case for Databases on Kubernetes from a Former Skeptic

Looking back at the pitfalls of running databases on Kubernetes I encountered several years ago, most of them have been resolved.

All of these problems are hard and require technical finesse and careful thinking. Without choosing the right pieces, we’ll end up resigning both databases and Kubernetes to niche roles in our infrastructure, as well as the innovative engineers who have invested so much effort in building out all of these pieces and runbooks.

Do You Really Need Kubernetes?

Do you really need Kubernetes for your environment? Or is it just another case of the next ‘new and shiny’ object, with people distracted by the novelty and possibility, rather than the facts?

In this article, I’ll take a closer look at why Kubernetes might be a case of the hype outweighing the helpfulness in most cases.

Why Kubernetes Is The Best Technology For Running A Cloud-Native Database

Must a database run on Kubernetes to be considered cloud-native?

While Kubernetes was originally designed for stateless workloads, recent improvements in Kubernetes such as StatefulSets and persistent volumes have made it possible to run stateful workloads as well. Even longtime DevOps practitioners skeptical of running databases on Kubernetes are beginning to come around, and best practices are starting to emerge.

Optimizing Relational Database Access

PostgreSQL’s protocol is currently at version 3, and there are concerns about improving the protocol in this regard.

The V4 wire protocol changes and the wanted features for V4 documents share concerns about version 4 with pipelining and multiplexing in mind. PostgreSQL also has a proposed feature called Protocol hooks that decouples PostgreSQL from the current protocol. It aims to provide extensibility of the wire protocol. Such a feature could be an enabler for multiplexing.

It took 25 years to deliver HTTP/2 and introduce multiplexing to increase performance drastically. Most database protocols have not followed the same path yet and remain in the stone age of connection pooling (at least databases with an openly documented protocol).

Multiplexed database protocols could improve performance, and make connection pools a thing of the past. It would also provide the foundation for efficient data streaming from databases.

Jakarta EE Application Deployment to Kubernetes Cluster in Jelastic PaaS

Recently, Jelastic were asked to sponsor cloud hosting of a Jakarta EE project, called Cargo Tracker.

Being a member of Jakarta EE Working Group, Jelastic wanted to support the community and thus we started to run this application at one of our service providers (Scaleforce).

In this article, we would like to show how to deploy the Jakarta EE projects to the Kubernetes cluster within Jelastic PaaS using Cargo Tracker as an example.

Preventing YAML Parsing Vulnerabilities in Java

YAML is a human-readable language to serialize data that’s commonly used for config files. The word YAML is an acronym for “YAML ain’t a markup language” and was first released in 2001. You can compare YAML to JSON or XML as all of them are text-based structured formats.

YAML files are often used to configure applications, application servers, or clusters. It is a very common format in Spring Boot applications and, of course, to configure Kubernetes. However, similarly to JSON and XML, you can use YAML to serialize and deserialize data.

Why Java Developers Continue to Rely on Jakarta EE

Over the past year, the Eclipse Foundation spoke to leading Java developers around the world to discuss why they rely on Jakarta EE and the unique benefits of using Jakarta EE technologies.

Their input is captured in our white paper, which describes the important advantages Jakarta EE offers today and for the future.

Deploying Spring Boot Applications on Kubernetes

In this article, I will explain how you can create a pod, deploy a Spring Boot application, and manage the single node cluster with Lens IDE on Docker Desktop.

By the end, you will have learned how to enable Kubernetes on Docker Desktop for Mac, created a basic pod, deployed a Spring Boot application, and managed our single-node Kubernetes cluster with the help of Lens IDE.

What are you waiting for? Go containerize and share your applications!

Creating a Kubernetes Operator in Java

Kubernetes is much more than a runtime platform for Docker containers.

Through its API, you can not only create custom clients, but you can also extend Kubernetes. Those custom Controllers are called Operators and work with application-specific custom resource definitions. You can not only write those Kubernetes operators in Go, but you can do this also in Java.

In this talk, delivered by Payara’s Rudy De Busscher at JCON 2020, you will be guided through setting up and your first explorations of the Kubernetes API within a plain Java program.