You have three nodes/instances, in which you must install the components necessary to build a running Kubernetes cluster. Once the cluster has been built verify all nodes are in the ready status, you need to start testing deployments, pods, services, and port forwarding, as well as executing commands from a pod. You need to perform the following…

Kubernetes.md

Kubernetes Bare Installation and Sample Deployment

Get the Docker gpg, and add it to your repository.

Run the following commands to get the Docker gpg key and add it to your repository:

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

Get the Kubernetes gpg key, and add it to your repository.

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Run the following commands to get the Kubernetes gpg key and add it to your repository:

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

cat << EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list deb https://apt.kubernetes.io/ kubernetes-xenial main sudo apt-get update

Install Docker, kubelet, kubeadm, and kubectl.

Run the following command to install Docker, kubelet, kubeadm, and kubectl:

sudo apt-get install -y docker-ce=18.06.1~ce~3-0~ubuntu kubelet=1.13.5-00 kubeadm=1.13.5-00 kubectl=1.13.5-00

Initialize the Kubernetes cluster.

Run the following command to initialize the cluster using kubeadm:

sudo kubeadm init --pod-network-cidr=10.244.0.0/16

Set up local kubeconfig.

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Run the following command to set up local kubeconfig:

mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config

Apply the flannel CNI plugin as a network overlay.

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Run the following command to apply flannel:

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml

Join the worker nodes to the cluster, and verify they have joined successfully.

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Run the following command to join the worker nodes to the cluster:

sudo kubeadm join <your unique string from the output of kubeadm init>

Run a deployment that includes at least one pod, and verify it was successful.

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Run the following commands to run a deployment of ngnix and verify:

kubectl run nginx --image=nginx

kubectl get deployments

Verify the pod is running and available.

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Run the following command to verify the pod is up and running:

kubectl get pods

Use port forwarding to extend port 80 to 8081, and verify access to the pod directly.

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Run the following command to forward the container port 80 to 8081:

kubectl port-forward [pod_name] 8081:80

Open a new shell to the Kubernetes master and run the following command:

curl --head http://127.0.0.1:8081

NOTE: You must leave the previous session open in order to properly port forward. As soon as you close that session, the port will NO LONGER be open.

Execute a command directly on a pod.

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Run this command to execute the nginx version command from a pod:

kubectl exec -it <pod_name> -- nginx -v

Create a service, and verify connectivity on the node port.

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Run these commands to create a NodePort service and verify the connectivity on a worker node:

kubectl expose deployment nginx --port 80 --type NodePort kubectl get services curl -I localhost:$node_port