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  • in DevOps
  • 3 min read

High Availability Deployment by Pod Topology Spread Constraints in K8s Cluster

In the modern world, running a high-availability service is the most important thing for the users. As Kubernetes is getting more common, it's essential to know how to achieve a robust deployment across all the Applications. Assuming the network unreliability is handled by the Application retry and idempotency mechanism, what's left is to make sure the Applications are running well. The only threat is some "real-world" damage to the server. so we are always told to spread our application across different server-rack, data center zones, or geography regions.

In this article, we will share:

  1. Related K8s labels to be used
  2. How to use the Pod Topology Spread Constraints
  3. How would it work
  • in DevOps
  • 7 min read

Design an Easy-to-Test, Flexible Application with Config Server, Toggle System, and Mock Server

In the modern software's fast-paced environment, the ability to swiftly adapt to changing requirements and market demands is the key to success. Achieving this needs the adoption of robust development practices. In this article, we will dive into how to design an easy-to-test, flexible application using a combination of powerful tools: Config Server, Toggle System, and Mock Server. When well implemented and applying a decent workflow, these components can significantly enhance the development lifecycle, enabling teams to build resilient and adaptable software systems.

  • in DevOps
  • 10 min read

Safely Deliver Large Scale Feature Migration With Feature Toggle

Large-scale Change (LSC) within software development often presents massive challenges. It's a scenario that needs careful planning to meet the need for stability. As DevOps philosophy evolves at a rapid pace, seamless implementation, testing, and release of these changes becomes necessary. This is why feature toggles emerge as a valuable tool, offering a variety of strategies to manage, test, and deploy large-scale changes effectively.

In this article, we will mainly describe how to develop, test, and release an LSC safely with feature toggles. Starting from the definition of LSC, why it needs help from feature toggle, and what kind of LSC can be covered. Next, we will introduce what kind of toggle we will use, and brief the migration schedule. Finally, we will show what to do with the code and toggle settings during the development, testing, and release stages with an easy demo. Let's begin!

  • in DevOps
  • 9 min read

Easier, Flexible, and Lower Resource Cost Deployment Strategies by Feature Toggle

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Having different deployment strategies is essential to ensure that the new version of the software is delivered to users in an efficient and robust way. After reading other articles, we can organize the following insight of deployment-strategies( If you are not familiar with deployment strategies, please see deployment-strategies or deployment-strategies-6-explained-in-depth to get a comprehensive explanation).

  • in DevOps
  • 7 min read

The First Step Toward True Continuous Delivery

Run End to End Test in PR check by GitHub Action

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This article will cover the first step for achieving True Continuous Delivery: How to gain more confidence when merging code into the main branch. The answer is always more tests, more specifically, more automated tests. Unlike the unit test, the E2E (End to End) test is more approximate to the real environment, which gives more confidence when it is passed.