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WHAT IS KUBERNETES CNI HOW TO
This article doesn’t cover how to setup a kubernetes cluster itself, you could use minikube to quickly spin up a test cluster. This post will give you insight on how kubernetes actually creates networks and also how to setup a network for a kubernetes cluster yourself. Kubernetes networking is a complex topic, if not even the most complicated topic.
WHAT IS KUBERNETES CNI FREE
If you like, Feel free to clap for this article which makes me happy.How to Understand and Set Up Kubernetes Networking, Including Multiple Networks Next article brings you, configure Kubernetes context with switching multiple clusters using contexts. $ kubeadm token create -print-join-command If you forgot to copy join command, run this command to get it again. $ kubeadm join - token : - discovery-token-ca-cert-hash sha256: The kubectl join command that you got from kubeadm init,run it on other servers which you gonna use as worker nodes. If you have calico.yaml file, run : $ kubectl apply -f calico.yaml Add Worker Nodes $ mkdir -p $HOME/.kube $ sudo cp -i /etc/kubernetes/nf $HOME/.kube/config $ sudo chown $(id -u):$(id -g) $HOME/.kube/config Apply Network Plugin Setup kubectl CLI in Master node and it will work for your non-root user.
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The output looks like this: kubeadm join - token : - discovery-token-ca-cert-hash sha256: $ kubeadm init -config=kubeadm-config.yaml Spin Up kubernetes Cluster (Master Node | Worker Nodes)Ĭhoose a server for Master Node and make sure you have both kubeadm-config.yaml file and calico.yml file inside the server. Note: if you want to add this IP range into kubeadm configuration, make sure to change my kubeadm-config.yaml file’s podSubnet and replace with above configuration. Also, you can specify a service network as well. Note down calico’s CIDR and put it into podSubnet attribute inside kubeadm configuration yaml (kubeadm-config.yaml) file.
WHAT IS KUBERNETES CNI DOWNLOAD
You can download calico.yaml file from this URL: $ wget ĭon’t apply network plugin untill run kubeadm init If you want to add CIDR via command line, use this: -pod-network-cidr=192.168.0.0/16. kubeadm only supports Container Network Interface (CNI) based networks.įor Calico to work correctly, you need to pass it with kubeadm configurations. Also, CoreDNS will not start up before a network is installed. The network must be deployed before any applications. Kubectl is a command-line interface to manage Kubernetes cluster.
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This is exactly what kubeadm sets us up to do. It uses the API server but it doesn’t depend on it so we can actually use the Kubelet to manage the control plane components. Kubelet which manages containers running on a single host. In my last article, I installed kubelet package with Kubeadm. Control plane components are automatically created by kubeadm while you create the master node by running command kubeadm init. The Kubernetes master controls each node you’ll rarely interact with nodes directly.Ĭontrol plane has components which are required for cluster. The Kubernetes nodes in a cluster are the machines (VMs, physical servers, etc) that run your applications and cloud workflows. When you interact with Kubernetes, such as by using the kubectl command-line interface, you’re communicating with your cluster’s Kubernetes master. The Kubernetes master is responsible for maintaining the desired state for your cluster. I can suggest, kubeadm is the one of an easier way to create kubernetes cluster. Kubeadm configuration file is needed to set up a master node after you can create worker nodes using the join command. To avoid this difficulty, Kubeadm is used to create kubernetes clusters.Īlso here talk about network plugins (CNI tools) to communicate between pods how you setting up CNI on kubeadm configuration file.
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You can see why if you see the hard way of doing it. If you are not going to use kubeadm to sping up a cluster. Kubernetes : Spin Up Highly Available Kubernetes Cluster using kubeadm & Setup CNI | Part 3 Overview