Overview For learning purpose, creating a kafka cluster with just one broker is usually enough. However, to simulate the real word, setting up a 3 nodes cluster is ideal. This post shows you how to quickly setup a 3 nodes cluster on your machine with kafka 3.9 Download Kafka You can download kafka 3.9 from … Read more
In this post, we’ll walk through the architecture and implementation of a simple microservices-based online store built with: Microservices Architecture Our online store is made up of the following services: Service Responsibility catalog-service Manages products (name, price) order-service Handles orders, triggers workflow events inventory-service Reserves stock when an order is placed payment-service Simulates payment processing … Read more
Goal: Build a small Java app with intentional performance problems, and use real-world tools to analyze and understand: Step 1: Set Up a Java App with a Memory Leak What’s a memory leak in Java? In Java, memory leaks occur when objects are unintentionally kept in memory because they’re still referenced, preventing the Garbage Collector … Read more
Overview A classic pattern in web applications is that the user requests something that is not immediately available, your app then does a heavy computation and returns the result to the user. However, since the task is long-running, you cannot make the user wait for the result. One of the easiest ways is to email … Read more
Overview Recently, I upgraded keycloak from 17 to 26. The update was swift. Keycloak did all the database migration. However, after the upgrade, the site broke. I set up keycloak behind a Caddy proxy. I hope this helps saving you some hours. Caddy’s config Keycloak’s config You may struggled with issues with mixed content, the … Read more
Concepts Here are the important concepts in the first section of CISSP Abstraction: Simplifying security by grouping similar elements into classes or roles and assigning security controls collectively. Accounting (Accountability): Review log files to check for compliance and violations to hold subjects responsible for their actions, especially policy violations. Acquisition: Obtaining hardware, software, and services, … Read more