I running docker desktop with kubernetes option turned on. I have one node called docker-for-dektop.
Now i have created a new ubuntu docker container. I want to add this container to my kubernetes cluster. Can be done? how can i do it?
As far as I'm aware, you cannot add a node to Docker for Desktop with Kubernetes enabled.
Docker for Desktop is a single-node Kubernetes or Docker Swarm cluster, you might try using kubernetes-the-hard-way as this explains how to setup a cluster and add nodes manually without the use of kubeadm.
But I don't think this might work as there will be a lot of issues with setting up the network to work correctly.
You can also use the instructions on how to install kubeadm with kubelet and kubectl on Linux machine and adding a node using kubeadm join.
Related
I'm setting up a bare-metal hypervisor with VMware ESXi on a local server which will have a kubernetes cluster.
Should I use Linux containers with LXD to set up my Kubernetes cluster? or should I use several VMs that I can provide with my VMware hypervisor?
I'm not sure what you are referring to by using LXD to set up your Kubernetes cluster. Kubernetes doesn't officially support LXC/LXD.
So, you can use several VMs for your Kubernetes control (masters) and data planes (nodes). You can either use straight docker or any containerd or cri-o as shims to run your container runtime.
In any case, most of this stuff is already set up by the deployment tools like:
kubespray
kubeadm
kops
Vendor offerings (EKS, GKS, AKS, etc)
etc
If you are looking for something more minimal you can try:
minikube
kind
microk8s
K3s
I have MiniKube running on my Windows 10 machine. I would like to add an additional node to the cluster.
I have a Centos VM running on a different host that has k8s installed. How to I get the kubectrl join command to run on the VM from the master node running on my Windows machine?
Do I need to install an overlay network on the MiniKube VM? Or is one already installed?
Minikube is officially single-node at the moment. There's a discussion about this limitation at https://github.com/kubernetes/minikube/issues/94 But it seems people have found ways to do it with VirtualBox and there are other ways to run a multi-node cluster locally. Otherwise I'd suggest creating a cluster with one of the cloud providers (e.g. GKE).
I am trying to create Kubernetes cluster with different number of nodes using same machine. Here I want to create separate VMs and need to create node in those VMs. I am currently exploring about kubeadm and minikube for these tasks.
When I am exploring I had the following confusions:
I need to create 4 number of nodes each need to create in different VMs. Can I use kubeadm for these requirement?
Also found that Minikube is using for creating the single node structure and also possible to use to creation of VMs. What is the difference between kubeadm and minikube ?
If I want to create nodes in different VMs which tool should use along with installation of Kubernetes cluster master?
If I am using VMs, then can I directly install VMware workstation / virtualbox in my Ubuntu 16.04 ?
In AWS EC2, they already giving the Ubuntu as a virtual machine. So is possible to install VMware workstation on ubuntu? Since it is VMs on another VM.
Kubeadm should be a good choice for you. It is quite easy to use by just following the documentation. Minikube would give you only single node Kubernetes. As of minikube 1.10.1, it is possible to use multi-node clusters.
Kubeadm is a tool to get Kubernetes up and running on already existing machine. It will basically configure and start all required Kubernetes components (for minimum viable cluster). Kubeadm is the right tool to bootstrap the Kubernetes cluster on your virtual machines. But you need to prepare the machines your self (install OS + required software, networking, ...). kubeadm will not do it for you.
Minikube is a tool which will allow you to start locally single node Kubernetes cluster. This is usually done in a VM - minikube supports VirtualBox KVM and others. It will start for you the virtual machine and take care of everything. But it will not do a 4 node cluster for you.
Kubeadm takes care of both. You first setup the master and then use kubeadm on the worker nodes to join the master.
When you use Kubeadm, it doesn't really care what do you use for the virtualization. You can choose whatever you want.
Why do you want to run virtual machines on top of your EC2 machine? Why not just create more (perhaps smaller) EC2 machines for the cluster? You can use this as an inspiration: https://github.com/scholzj/terraform-aws-kubernetes. There are also some more advanced tools for setting up the whole cluster such as (for example) Kops.
I am not sure if this is possible, but if it is and someone have the experience to do so, could we not create a docker image for windows that represent an node?
I imaging that we will have a folder with configuration files, that can be mounted with docker -v
then if one needed a 5 node cluster, i would just run
docker run -v c:/dev/config:c:/config microsoft/servicefabric create-node --someOptions
for each node we wanted.
Is there any barriers for doign this? have anyone create the docker images for doign so? This would really simplify setting up a cluster on premise.
Using the 6.1 release you can run a cluster in a container, for dev/test purposes.
I'm not sure if you can get it to work with multiple containers though.
Service Fabric Linux Clusters in a Container
We have provided a
pre-configured Docker container image to run Service Fabric Linux
clusters in a container. The main scenario is to provide a
light-weight development experience for MacOS, but the container will
also run on Linux and Windows, using Docker CE.
To get started, follow the directions here:
https://learn.microsoft.com/en-us/azure/service-fabric/service-fabric-get-started-mac
and
https://learn.microsoft.com/en-us/azure/service-fabric/service-fabric-local-linux-cluster-windows
I forgot to set export KUBE_ENABLE_INSECURE_REGISTRY=true when running kube-up.sh (AWS provider). I was wondering if there was anyway to retroactively apply that change to a running cluster. It is only a 3 node cluster so doing it manually is an option. Or is the only way to tear down the cluster and start from scratch?
I haven't tested it but in theory you just need to add --insecure-registry 10.0.0.0/8 (if you are running your insecure registry in the kube network 10.0.0.0/8) to the docker daemon options (DOCKER_OPTS).
You can also specify the url instead of the network.