No matter how hard you work in implementing DevOps practices in your organization, there are always questions arising regarding the actual bottom-line value that it brings. Especially in larger organizations, where it’s easier to coast along without being noticed if your work is actually making an impact or not.

Recently I found myself in a position several time to explain to people both in and outside of the Tech industry about DevOps, the value it brings and is it just another trap to milk money off people and companies. So I have decided to make sense of my thoughts and put it all into writing, for future reference to myself and anyone else asking about what is the real value of DevOps.

If you ever ran a serious production database (is there any other kind, really? 🤔 ), you are most likely using some sort of database migration tool. Tools like Flyway, Liquibase or Knex for JS are pretty good at that and haven’t caused much trouble in our lives until we started treating our apps as cattle and run them in K8s, replicated, rescheduled every now and then, without us even knowing. They scale up and down automatically, sometimes even in the middle of the night while we sleep soundly in our beds. Then something interesting starts to happen….

The day has finally come! I have mustered up time, strenght and willpower to move from Wordpress into something more exciting. You might argue that it’s unnecessary and that I could have continued with WP but the truth is that I wanted something more involved where I could get my hands dirty figuring out stuff. You can figure stuff out in Wordpress, edit the theme etc… But I was never a Wordpress fanboy because of bloat and all the PHP. You might think of this as ditching an old boring girlfriend for a new exciting one but…. PHP - do I need any more excuses?

Kubernetes health probes have just become first class citizens in Spring Boot! Just before the release of Spring Boot 2.3, this article appeared on the Spring blog. These are awesome news because now you can leverage the framework and remove all that custom logic for liveness and readiness checks you have written in the past. In this post, let’s see how you can setup this feature in your application.

Create a demo application

For this tutorial, create a simple spring boot web application that fetches some products. We will create a Product domain entity:

Often times, you will run into obscure errors that require you to take a peek under the JVM hood, which in itself can be a daunting task. In this tutorial, we will take a look on how to troubleshoot a running application in a Kubernetes cluster with VisualVM as well as how to inspect Heap Dumps and how to pass them from the container to our machine.

For this example, we have a Hello Spring Boot Application (the code can be found here) that saves a timestamp of each request in memory (in order to provide us some interesting data for us to analyze later on). We will be working hands on with VisualVM so make sure to download it and start it up, it is very straightforward and here is the link. One could also use JConsole for such a task but let’s leave that for some other time.

Why would you want to auto-generate MySQL tables on startup with Spring Data? A lot of times, I will run into a project and see this “smart” way to automate schema and table creation where there is either a sidecar that executes a bash script or even worse, have it in the Dockerfile. As tempting as that hack is, it is totally unnecessary as we have everything we need to do that with out of the box. This is very useful setup as you want your applications to be self sufficient and don’t have to worry about making changes at two places (application and the database).

There will be times when debugging on your local machine just won’t do it due to configs, environments, etc… In that case, wouldn’t it be great you can actually remote debug your Spring Boot app running in your Kubernetes cluster? In this tutorial, we’ll take a look at a pretty straightforward way in debugging Spring applications on Kubernetes. There are certain times when you want to do this, as you might have an integrated K8s setup, with ConfigMaps, Secrets and other services.