i have only one instance machine which is centos-7 minimal installation. can i install kubernates cluster as a master and node same machine(without minikube and micro8s). is there any possible way?
Thanks.
You can use kind. Kind is a tool for running local Kubernetes clusters using Docker container. So on the same machine docker containers are created for each Kubernetes node.
Also you can install a single node Kubernetes cluster using kubeadm and the master node can be marked as schedule-able so that pods can be scheduled on the master node.
Related
I have created a k8s cluster by installing "kubelet kubeadm kubectl". Now i'm trying to Deploy microservice application as
docker build -t demoserver:1.0 .
=>image created successfully
kubectl run demoserver --image=demoserver --port=8000 --image-pull-policy=Never
=>POD STATUS: ErrImageNeverPull
I tried " eval $(minikube docker-env)" but it says bash: minikube: command not found...
Do i need to install minikube? Is my above cluster setup is not enough for deployment??
Minikube and kubeadm are two unrelated tools. Minikube builds a (usually) single node cluster in a local VM for development and learning. Kubeadm is part of how you install Kubernetes in production environments (sometimes, not all installers use it but it's designed to be a reusable core engine).
I want to configure a Kubernetes cluster with only Docker containers without using vm on one machine. I think it will be, but I ask because it may not be.
Checkout Kubernetes In Docker - kind
This is probably what you want.
If I am getting your question right you want to use Kubernetes on a physical box without using any hypervisor (no vm)
You can install minikube and use Kubernetes as below
minikube start --vm-driver=none
So I installed RancherOS after that Rancher and got My Kubernetes Cluster.
Added singled node with all roles,
now thinking how to add more nodes on the same physical machine. Any advices what docker image u used to run rancher agent on it, so I can spin another node for k8s cluster?
I just want to run multiple nodes on a single physical machine.
You can try k3s (this is a product from the rancher labs).
You can run the kubernetes cluster on one machine via docker-compose
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.
I have a set of docker images running in a Kubernates cluster on GKE. I have a Jenkins server running on a VM in GKE.
I have docker builds and GKE deploys running on the Jenkins server, but I would like to start up a 'local' cluster on the Jenkins server after successful builds, run my dockers in that cluster, run my tests towards the cluster, and then close down the local cluster before deploying the docker images to GKE.
I know about minikube, but they state that you are not able to run nested VM's, and I wonder if this blocks my dream of test my cluster before deploying it?
Do I have to run my local cluster on a physical server to be able to run my tests, or is there a solution to my problem?
Have you considered using kubeadm?
You can run a Kubernetes cluster within your Jenkins VM. Setup is a bit different than minikube and it's still in beta but it will let you test your cluster before the final deployment.