When you browse the module list of Ansible, you will find that the by far largest section is the list of cloud modules, i.e. modules to interact with a cloud environments to define, provision and maintain objects like virtual machines, networks, firewalls or storage. These modules make it easy to access the APIs of virtually … Continue reading Automating provisioning with Ansible – building cloud environments
In the previous post, we have learned the basics of Ansible and how to use Ansible to execute a command - represented by a module - on a group of remote hosts. In this post, we will look into some useful modules in a bit more detail and learn a bit more on idempotency and … Continue reading Automating provisioning with Ansible – using modules
For my projects, I often need a clean Linux box with a defined state which I can use to play around and, if a make a mistake, simply dump it again. Of course, I use a cloud environment for this purpose. However, I often find myself logging into one of these newly created machines to … Continue reading Automating provisioning with Ansible – the basics
So far I have mostly used Amazons EKS platform for my posts on Kubernetes. However, this is of course not the only choice - there are many other providers that offer Kubernetes in a cloud environment. One of them which is explicitly targeting developers is DigitalOcean. In this post, I will show you how easy … Continue reading Automating cluster creation on DigitalOcean
In one of my previous posts, we have looked at deployment controllers which make sure that a certain number of instances of a given pod is running at all times. Failures of pods and nodes are automatically detected and the pod is restarted. This mechanism, however, only works well if the pods are actually interchangeable … Continue reading Stateful sets with Kubernetes
In the last post, we have seen the magic of persistent volume claims in action. In this post, we will look in more details at how Kubernetes actually manages storage. Storage classes and provisioners First, we need to understand the concept of a storage class. In a typical environment, there are many different types of … Continue reading Kubernetes storage under the hood part III – storage classes and provisioning
The storage types that we have discussed so far realize ephemeral storage, i.e. storage tied to the lifecycle of the Pod on a specific node. Of course, there are many use cases like databases or other stateful applications that require storage that is persistent and has a lifecycle independent of the Pod. In this post, … Continue reading Kubernetes storage under the hood part II – persistent storage
