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We also recommend that a 186 | file or class name and description of purpose be included on the 187 | same "printed page" as the copyright notice for easier 188 | identification within third-party archives. 189 | 190 | Copyright [yyyy] [name of copyright owner] 191 | 192 | Licensed under the Apache License, Version 2.0 (the "License"); 193 | you may not use this file except in compliance with the License. 194 | You may obtain a copy of the License at 195 | 196 | http://www.apache.org/licenses/LICENSE-2.0 197 | 198 | Unless required by applicable law or agreed to in writing, software 199 | distributed under the License is distributed on an "AS IS" BASIS, 200 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 201 | See the License for the specific language governing permissions and 202 | limitations under the License. 203 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # kubeadm: Single Node Kubernetes Cluster 2 | 3 | This tutorial will walk you through bootstrapping a single-node Kubernetes cluster on [Google Compute Engine](https://cloud.google.com/compute/) using [kubeadm](https://github.com/kubernetes/kubeadm). 4 | 5 | ## Tutorial 6 | 7 | Create a single compute instance: 8 | 9 | ```bash 10 | gcloud compute instances create kubeadm-single-node-cluster \ 11 | --can-ip-forward \ 12 | --image-family ubuntu-1704 \ 13 | --image-project ubuntu-os-cloud \ 14 | --machine-type n1-standard-4 \ 15 | --metadata kubernetes-version=stable-1.8 \ 16 | --metadata-from-file startup-script=startup.sh \ 17 | --tags kubeadm-single-node-cluster \ 18 | --scopes cloud-platform,logging-write 19 | ``` 20 | 21 | Enable secure remote access to the Kubernetes API server: 22 | 23 | ``` 24 | gcloud compute firewall-rules create default-allow-kubeadm-single-node-cluster \ 25 | --allow tcp:6443 \ 26 | --target-tags kubeadm-single-node-cluster \ 27 | --source-ranges 0.0.0.0/0 28 | ``` 29 | 30 | Fetch the client kubernetes configuration file: 31 | 32 | ``` 33 | gcloud compute scp kubeadm-single-node-cluster:/etc/kubernetes/admin.conf \ 34 | kubeadm-single-node-cluster.conf 35 | ``` 36 | 37 | > It may take a few minutes for the cluster to finish bootstrapping and the client config to become readable. 38 | 39 | Set the `KUBECONFIG` env var to point to the `kubeadm-single-node-cluster.conf` kubeconfig: 40 | 41 | ``` 42 | export KUBECONFIG=$(PWD)/kubeadm-single-node-cluster.conf 43 | ``` 44 | 45 | Set the `kubeadm-single-node-cluster` kubeconfig server address to the public IP address: 46 | 47 | ``` 48 | kubectl config set-cluster kubernetes \ 49 | --kubeconfig kubeadm-single-node-cluster.conf \ 50 | --server https://$(gcloud compute instances describe kubeadm-single-node-cluster \ 51 | --format='value(networkInterfaces.accessConfigs[0].natIP)'):6443 52 | ``` 53 | 54 | ## Verification 55 | 56 | List the Kubernetes nodes: 57 | 58 | ``` 59 | kubectl get nodes 60 | ``` 61 | ``` 62 | NAME STATUS ROLES AGE VERSION 63 | kubeadm-single-node-cluster Ready master 35m v1.8.0 64 | ``` 65 | 66 | The node version reflects the `kubelet` version, therefore it might be different 67 | than the `kubernetes-version` specified above. 68 | 69 | Find out Kubernetes API server version: 70 | 71 | ``` 72 | kubectl version --short 73 | ``` 74 | ``` 75 | Client Version: v1.8.0 76 | Server Version: v1.8.0 77 | ``` 78 | 79 | Create a nginx deployment: 80 | 81 | ``` 82 | kubectl run nginx --image nginx:1.13 --port 80 83 | ``` 84 | 85 | Expose the nginx deployment: 86 | 87 | ``` 88 | kubectl expose deployment nginx --type LoadBalancer 89 | ``` 90 | 91 | ## Cleanup 92 | 93 | ``` 94 | gcloud compute instances delete kubeadm-single-node-cluster 95 | ``` 96 | 97 | ``` 98 | gcloud compute firewall-rules delete default-allow-kubeadm-single-node-cluster 99 | ``` 100 | 101 | ``` 102 | rm kubeadm-single-node-cluster.conf 103 | ``` 104 | -------------------------------------------------------------------------------- /startup.sh: -------------------------------------------------------------------------------- 1 | #! /bin/bash 2 | set -e 3 | set -x 4 | 5 | sudo curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - 6 | 7 | cat < kubernetes.list 8 | deb http://apt.kubernetes.io/ kubernetes-xenial main 9 | EOF 10 | 11 | sudo mv kubernetes.list /etc/apt/sources.list.d/kubernetes.list 12 | 13 | sudo apt-get update 14 | sudo apt-get install -y apt-transport-https 15 | sudo apt-get install -y docker.io 16 | sudo apt-get install -y kubelet kubeadm 17 | 18 | sudo systemctl enable docker.service 19 | 20 | cat < 20-cloud-provider.conf 21 | Environment="KUBELET_EXTRA_ARGS=--cloud-provider=gce" 22 | EOF 23 | 24 | sudo mv 20-cloud-provider.conf /etc/systemd/system/kubelet.service.d/ 25 | systemctl daemon-reload 26 | systemctl restart kubelet 27 | 28 | EXTERNAL_IP=$(curl -s -H "Metadata-Flavor: Google" \ 29 | http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/0/access-configs/0/external-ip) 30 | INTERNAL_IP=$(curl -s -H "Metadata-Flavor: Google" \ 31 | http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/0/ip) 32 | KUBERNETES_VERSION=$(curl -s -H "Metadata-Flavor: Google" \ 33 | http://metadata.google.internal/computeMetadata/v1/instance/attributes/kubernetes-version) 34 | 35 | cat < kubeadm.conf 36 | kind: MasterConfiguration 37 | apiVersion: kubeadm.k8s.io/v1alpha1 38 | apiServerCertSANs: 39 | - 10.96.0.1 40 | - ${EXTERNAL_IP} 41 | - ${INTERNAL_IP} 42 | apiServerExtraArgs: 43 | admission-control: PodPreset,Initializers,GenericAdmissionWebhook,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota 44 | feature-gates: AllAlpha=true 45 | runtime-config: api/all 46 | cloudProvider: gce 47 | kubernetesVersion: ${KUBERNETES_VERSION} 48 | networking: 49 | podSubnet: 192.168.0.0/16 50 | EOF 51 | 52 | sudo kubeadm init --config=kubeadm.conf 53 | 54 | sudo chmod 644 /etc/kubernetes/admin.conf 55 | 56 | kubectl taint nodes --all node-role.kubernetes.io/master- \ 57 | --kubeconfig /etc/kubernetes/admin.conf 58 | 59 | kubectl apply \ 60 | -f http://docs.projectcalico.org/v2.4/getting-started/kubernetes/installation/hosted/kubeadm/1.6/calico.yaml \ 61 | --kubeconfig /etc/kubernetes/admin.conf 62 | --------------------------------------------------------------------------------