Tag Archives: Kubernetes

In this post I am going to show a few steps to deploy and run PostgreSQL database in a K8S cluster on OKE.The deployment is going to be based on postgres:11.1 Docker image which requires a few environment variables to be configured: POSTGRES_DB (database name), POSTGRES_USER and POSTGRES_PASSWORD. I am going to store values of these variables in K8S ConfigMap ...

In this post I am going to discuss various deployment strategies and how they can be implemented with K8s and Istio. Basically the implementation of all strategies is based on the ability of K8s to run multiple versions of a microservice simultaneously and on the concept that consumers can access the microservice only through some entry point. At that entry ...

Let’s assume there is a microservice represented by a composition of containers running on a K8s cluster somewhere in a cloud, e.g.Oracle Kubernetes Engine (OKE). At some point we want to quickly stress test a specific microservice component or the entire microservice. So we want to know how it works under the load, how it handles many subsequent requests coming ...

“I love writing authentication and authorization code.” ~ No Java Developer Ever. Tired of building the same login screens over and over? Try the Okta API for hosted authentication, authorization, and multi-factor auth. In this tutorial, you’re going to use Kubernetes to deploy a Spring Boot microservice architecture to Google Cloud, specifically the Google Kubernetes Engine (GKE). You’re also going ...

You can make the Prometheus configuration aware of the Kubernetes environment your applications are running in. I’ve described how to do that manually, in a previous blog post. Prometheus Operator is an extension to Kubernetes that manages Prometheus monitoring instances in a more automated and effective way. Prometheus Operator allows you to define and manage monitoring instances as Kubernetes resources. ...

Prometheus supports scraping multiple instances of an application. Applications that run in orchestrated environments require to be discovered dynamically, since their IP addresses will change. Prometheus can be configured to use the Kubernetes API to discover changes in the list of running instances dynamically. The following shows a minimalistic Prometheus example of instrumenting an application with multiple pod instances. Prometheus ...

In Open Liberty, configuration of datasource credentials is typically done in the server.xml file. If we use containers and container orchestration, we ideally make use of Infrastructure-as-Code and store all configuration under version control. However, this is certainly not desired for these datasource credentials. For that reason, Kubernetes secret definitions allow us to separately store secret values that shouldn’t be ...

In the previous post we created our first micro service “ProductService” using SpringBoot and Docker. In this part we will go into details of how to manage multiple microservices using Spring Cloud, netflix libraries, API gateways . For our order management system, let’s say,  a minimal relationship could be something like this : So, let’s build 2 more services called “orderService” ...

In this series of workshop we will build few micro services using spring boot, docker and then deploy them into kubernetes. So, Lets get started. First we need to define a problem statement to begin with. Lets say we want to build a order management system. Identifying domains First step would be to understand what domains are required, for simplicity ...