I have a Intel Atom Dual Core with 4 GB RAM left over and want to use it to run docker images.
What possible solutions are there for such a local installation? I already found MicroK8s which looks promising, yet wondering which other alternatives there are. Is there maybe a complete distribution focused on only running docker containers?
If I would install MicroK8s, I still have to also manage the Ubuntu installation hosting it. Would be nice to have a distribution that only focuses on running docker containers and updates operating system and docker stuff together, so I know it always works fine together.
If you can run Docker, run Docker's Desktop Kubernetes Cluster.
You also can run minikube (on a top of docker, or hypervisor, or virtualbox)
kind - which is docker in docker k8s cluster.
This is a lab env for playing with Docker containers on Kubernetes without installing nothing: https://labs.play-with-k8s.com/
Minikube: https://github.com/kubernetes/minikube .
Docker Swarm: https://docs.docker.com/engine/swarm/ is an alternative to kubernetes with less features, but easy to setup. (comparison: https://medium.com/faun/kubernetes-vs-docker-swarm-whos-the-bigger-and-better-53bbe76b9d11)
Make your own cluster using VirtualBox: https://medium.com/#KevinHoffman/building-a-kubernetes-cluster-in-virtualbox-with-ubuntu-22cd338846dd
Local-machine Solutions
Community Supported Tools
Minikube is a method for creating a local, single-node Kubernetes cluster for development and testing. Setup is completely automated and doesn’t require a cloud provider account.
Kubeadm-dind is a multi-node (while minikube is single-node) Kubernetes cluster which only requires a docker daemon. It uses docker-in-docker technique to spawn the Kubernetes cluster.
Kubernetes IN Docker is a tool for running local Kubernetes clusters using Docker container “nodes”. It is primarily designed for testing Kubernetes 1.11+. You can use it to create multi-node or multi-control-plane Kubernetes clusters.
Ecosystem Tools
Docker Desktop is an easy-to-install application for your Mac or Windows environment that enables you to start coding and deploying in containers in minutes on a single-node Kubernetes cluster.
Minishift installs the community version of the Kubernetes enterprise platform OpenShift for local development & testing. It offers an all-in-one VM (minishift start) for Windows, macOS, and Linux. The container start is based on oc cluster up (Linux only). You can also install the included add-ons.
MicroK8s provides a single command installation of the latest Kubernetes release on a local machine for development and testing. Setup is quick, fast (~30 sec) and supports many plugins including Istio with a single command.
IBM Cloud Private-CE (Community Edition) can use VirtualBox on your machine to deploy Kubernetes to one or more VMs for development and test scenarios. Scales to full multi-node cluster.
IBM Cloud Private-CE (Community Edition) on Linux Containers is a Terraform/Packer/BASH based Infrastructure as Code (IaC) scripts to create a seven node (1 Boot, 1 Master, 1 Management, 1 Proxy and 3 Workers) LXD cluster on Linux Host.
Ubuntu on LXD supports a nine-instance deployment on localhost.
My very opionated answer: you should use k3s by Rancher Labs https://k3s.io/
Related
I have a windows 10 PC and want to run asp.net windows containers on top of a single node Kubernetes for testing before deploying to the cloud, so is this feasible?.
yes, windows 10 natively supports docker. you should be able to run windows containers.
use minikube for run single node kubernetes cluster and then deploy your windows container
Referring to the above answer and your question I will try to dispel your doubts.
Minikube is a tool that helps to run Kubernetes locally. Minikube enables to run single-node Kubernetes cluster inside a Virtual Machine (VM) on your laptop. You can read about minikube here: minikube.
Windows 10 supports docker. You can run asp.net windows containers on top of a Kubernetes cluster.
So assuming you have already running Kubernetes cluster you don't have to care about minikube. Just deploy your windows container on top of it. You can read about it here: windows-setup
I hope it helps.
I'm new on Kubernetes and currently following this guide: Deploy Kubernetes cluster for Windows containers. I recently noticed that the VM provisioned as master node is on Linux, my question is, "Is it possible to use Windows as a Kubernetes Cluster master node?".
My project requires to use Windows OS on physical servers, so Linux as OS for Kubernetes master node might not be good option for container orchestrator and I will need to use Docker Swarm instead.
According to Microsoft documentation you can’t use Windows as a Kubernetes master.
From here:
A recently-updated Linux machine is required to follow along;
Kubernetes master resources like kube-dns, kube-scheduler, and
kube-apiserver have not been ported to Windows yet.
Kubernetes documentation also implies that you need to have Linux master node.
Most tutorials I've seen for developing with Kubernetes locally use Minikube. In the latest Edge release of Docker for Windows, you can also enable Kubernetes. I'm trying to understand the differences between the two and which I should use.
Minikube lets you choose the version of Kubernetes you want, can Docker for Windows do that? I don't see a way to configure it.
Minikube has CLI commands to enable the dashboard, heapster, ingress and other addons. I'm not sure why because my undertstanding is that these are simply executing kubectl apply -f http://....
With Minikube I can do a minikube ip to get the cluster IP address for ingress, how can I do this with Docker for Windows?
Is there anything else different that I should care about.
I feel like you largely understand the space, and mostly have answers to your questions already. You might find Docker for Mac vs. Docker Toolbox an informative read, even if it's about the Mac equivalent rather than Windows and about Docker packaged as a VM rather than Kubernetes specifically.
In fact you are stuck with the specific version of Kubernetes the Docker Edge desktop distribution publishes.
is answered in the question.
I believe NodePort-type Services are published on your host's IP address; there isn't an intermediate VM address like there is with Docker Toolbox.
Docker Toolbox and minikube always use a full-blown virtual machine with an off-the-shelf hypervisor. The Docker desktop application might use a lighter-weight virtualization engine if one is available.
Kubernetes can involve some significant background work. If you're using Kubernetes-in-Docker it's hard to "turn off" Kubernetes and still have Docker available; but if you have a separate minikube VM you can just stop it.
Here is a part from Docker documentation:
Kubernetes is only available in Docker for Windows 18.02 CE Edge.
Kubernetes support is not included in Docker for Windows 18.02 CE
Stable. To find out more about Stable and Edge channels and how to
switch between them, see General configuration.
Docker for Windows 18.02 CE Edge includes a standalone Kubernetes
server and client, as well as Docker CLI integration. The Kubernetes
server runs locally within your Docker instance, is not configurable,
and is a single-node cluster.
The Kubernetes server runs within a Docker container on your local
system, and is only for local testing. When Kubernetes support is
enabled, you can deploy your workloads, in parallel, on Kubernetes,
Swarm, and as standalone containers. Enabling or disabling the
Kubernetes server does not affect your other workloads.
See Docker for Windows > Getting started to enable Kubernetes and
begin testing the deployment of your workloads on Kubernetes.
If you have enough CPU and RAM resources, you can easily have both, minikube and docker-for-desktop on the same machine and switch between them by selecting the context, e.g.:
> kubectl config get-contexts
> kubectl config use-context docker-for-desktop
There is no place at the moment to choose the Kubernetes version for docker-for-desktop. It is preselected in the Docker distribution package.
Unfortunately, version of docker inside the minikube is a step behind compared to available on the docker website, and some features could be missing, but if you are interested in Kubernetes environment, it doesn't really matter in most cases.
Some of the features of Kubernetes rely on external resources and could be unavailable for you in case of local installation. For example, you need an ability to create Cloud Load Balancer to use some types of the Ingress or Service objects.
But other resources can be easily started inside the minikube, or docker-for-desktop using kubectl create/apply.
To expose your cluster resources externally, you can use Webhook Relay Ingress controller.
Here is a link to the installation manual.
Currently I have a bunch of RHEL7 VMs running on RackSpace and want to deploy docker swarm for testing purpose. The Docker Docs only describes the method to deploy docker swarm by using docker machine.
Question:
Since VirtualBox cannot be used in VMs, are any other ways such that I can directly deploy docker swarm on my VMs without using docker machine?
In fact Docker documentation offers you how to set up a swarm cluster 'manually' without using docker-machine: Create a swarm for development
I think that this full step-by-step tutorial might be useful.
It details how to deploy Swarm with a multi-hosts network, without Docker-machine by using consul and suggest two different means for the Swarm agent discovery (static file and token).
We are currently trying out docker multi-node and need recommendations on production deployment docker or bare metal on ubuntu?
The getting started guides using docker (both the single and multi-nodes examples) are not meant to be used in a production deployment. They are meant to provide the lowest friction path to getting a cluster running where you can experiment with the Kubernetes concepts in a running cluster.
If your choices are between running a variant of the docker multi-node configuration and bare metal on Ubuntu, I would definitely recommend running on Ubuntu. See the Kubernetes Deployment On Bare-metal Ubuntu Nodes getting started guide.