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. This method would still work but you may have unpredictable consequences.
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.
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.
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.
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.
How to deploy new Docker images to your Kubernetes cluster? Of course, there are many ways and one of the most common ways is to use kubectl set image, for example:
Few months ago I wrote an article about replacing Minikube with MicroK8s , but now we have even better soluion, kind . Like dind allows running Docker inside Docker containers, kind allows running Kubernetes inside Docker containers. kind basically abstracts nodes as Docker containers and then runs Kubernetes inside.
Scaleway , a French company based in Paris, owned by Illiad telecommunication provider, just announced public availability of their managed Kubernetes solution called Kapsule . Scaleway has 5 data centers, 4 in France and 1 in Netherlands, but at the moment Kapsule (public beta version) is available just in the datacenter in Paris. DigitalOcean just got competition, so we can compare the pricing schemes in the later text.
I’ve just seen a talk on YouTube where running self managed Kubernetes cluster was described as ninja technique. I strongly disagree with this and actually want to disapprove it in this article. Running self managed K8S can also be inexpensive if you use a provider such as Hetzner Cloud.
Minikube is very popular and the most known Kubernetes version for local software development. It runs inside a virtual machine like VirtualBox and allows developers to run Kubernetes applications locally. As Docker runs natively just on Linux, you may wonder why do we need virtual machine on Linux? Well, not anymore.
