Kubernetes

Kubernetes simplified applications management a lot and this also applies to databases like MySQL/MariaDB, but lot of DevOps forget to apply traditional maintenance and optimization which is still necessary unless you are using some operator capable of doing so. The optimization method that will be described here applies just to single and master-slave replicated MySQL/MariaDB instances. If you run some clustered version like Galera , you probably have to find another way because of possible consistence and performance problems during the eventual optimization....

In the Cloud era topics like backup became kind of less important. One of the reasons is probably possibility to take automated snapshots of your volumes, another maybe that you can use some kind of redundancy. However, there are still use cases where you need more traditional ways to backup your data. In this article we will discuss about syncing files from your Kubernetes volume to S3 compatible storage. If you know the concept of Persistent Volumes in Kubernetes, then you also know three of the supported access modes: ReadWriteOnce, ReadOnlyMany or ReadWriteMany....

Do you develop or plan to develop a Kubernetes native application in Golang, controller or operator? Such application strongly depends on being inside Kubernetes and development outside of Kubernetes may be a real hassle. Usually you have to build an image over and over again and restart the pod (with imagePullPolicy set to Always). This is very boring and time consuming procedure. Two years ago I developed an image to auto-recompile and auto-restart Go application, named go-reflex , but it was intented to be used by docker-compose....

You may wonder what the heck is helmfile ? Well, I would say what is docker-compose to Docker, this is helmfile to Helm . Basically, it allows us to install the whole stack of applications to our Kubernetes cluster in a declarative way. And you may also wonder why is cert-manager so special? I would say cert-manager itself is not that special Helm chart, but it contains CRD ’s which may be installed either by using value installCRDs=true or by installing them using kubectl apply before you install the chart....

Do you need ReadWriteMany storage class and your cloud provider doesn’t offer it? According to Wikipedia , Network File System (NFS) is a distributed file system protocol originally developed by Sun Microsystems (Sun) in 1984, allowing a user on a client computer to access files over a computer network much like local storage is accessed. Even though this idea is 35 years old, it is still very useful in your Kubernetes cluster, specially if you need ReadWriteMany storage class....