I am new to Kubernetes. I have created K8s cluster on my VM's which are VMware VM's. I have created helm charts to deploy my application. I want to install my application without logging into any of the cluster machines. Want to install it from my local windows 10 machine. How to configure my local machine to communicate with the Cluster? I have installed kubectl on my machine. Thanks in advance.
You can copy the kubeconfig file into your local machine. In the master VM the file is saved at $HOME/.kube/config. Copy that into your $HOME/.kube/config. Then run kubectl get nodes to check connectoin
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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).
Can I start minikube on a remote dedicated server to develope and test kubernetes with my team?
For now we didn‘t want to make a real 3 node cluster to safe money and I only can find information about minikube running for locally development.
Minikube is only designed for local development. You need to deploy a Kubernetes cluster using something like kubeadm
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.
If i have installed K8S using minikube, where will the master node components be installed. (Ex: the api server, replication controller, etcd etc)
Is it in the host? or the VM?
I understand the worker node is the VM configured by minikube
Everything is installed in the Virtual Machine. Based on the localkube project, it is creating an All-in-one single-node cluster.
More information here: https://github.com/kubernetes/community/blob/master/contributors/design-proposals/cluster-lifecycle/local-cluster-ux.md
I have to use a version of Kubernetes by me but I don't know how to tell to OpenShift to use that version of Kubernetes.
At the beginning I thought that I have to recompile the source code of OpenShift Origin and I did it. So, do someone tell me how to configure OpenShift to do what I explained above?
I use CentOS 7 on a CloudStack virtual machine.
Thanks in advance.
OpenShift can either run its own compiled-in Kubernetes components (which is the typical setup), or can run against an external Kubernetes server process. It does not manage launching an external Kubernetes binary.
You can run OpenShift against an external Kubernetes process by giving the OpenShift master a kubeconfig file containing connection information and credentials for an existing Kubernetes API server:
openshift start master --kubeconfig=/path/to/k8s.kubeconfig