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This lab will allow you to practice the process of building a new Kubernetes cluster. You will be given a set of Linux servers, and you will have the opportunity to turn these servers into a functioning Kubernetes cluster. This will help you build the skills necessary to create your own Kubernetes clusters in the real world.
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Log in to the lab server using the credentials provided:
$ ssh user@<PUBLIC_IP_ADDRESS>
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- Log into the Control Plane Node (Note: The following steps must be performed on all three nodes or desired nodes.)
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- Create configuration file for containerd:
$ cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf overlay br_netfilter EOF
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- Load modules:
$ sudo modprobe overlay sudo modprobe br_netfilter
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- Set system configurations for Kubernetes networking
$ cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf net.bridge.bridge-nf-call-iptables = 1 net.ipv4.ip_forward = 1 net.bridge.bridge-nf-call-ip6tables = 1 EOF
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- Apply new settings:
$ sudo sysctl --system
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- Install containerd:
$ sudo apt-get update && sudo apt-get install -y containerd
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- Create default configuration file for containerd:
$ sudo mkdir -p /etc/containerd
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- Generate default containerd configuration and save to the newly created default file:
$ sudo containerd config default > /etc/containerd/config.toml
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- Restart containerd to ensure new configuration file usage:
$ sudo systemctl restart containerd
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- Verify that containerd is running.
$ sudo systemctl status containerd
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- Disable swap:
$ sudo swapoff -a
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- Disable swap on startup in /etc/fstab:
$ sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
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- Install dependency packages:
$ sudo apt-get update && sudo apt-get install -y apt-transport-https curl
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- Download and add GPG key:
$ curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
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- Add Kubernetes to repository list:
$ cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list deb https://apt.kubernetes.io/ kubernetes-xenial main EOF
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- Update package listings:
$ sudo apt-get update
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- Install Kubernetes packages (Note: If you get a dpkg lock message, just wait a minute or two before trying the command again):
$ sudo apt-get install -y kubelet=1.23.0-00 kubeadm=1.23.0-00 kubectl=1.23.0-00
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- Turn off automatic updates:
sudo apt-mark hold kubelet kubeadm kubectl
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- Log into both Worker Nodes to perform previous steps.
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- Initialize the Kubernetes cluster on the control plane node using kubeadm (Note: This is only performed on the Control Plane Node):
$ sudo kubeadm init --pod-network-cidr 192.168.0.0/16 --kubernetes-version 1.23.0
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- Set kubectl access:
$ mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
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- Test access to cluster:
$ kubectl get nodes
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- On the Control Plane Node, install Calico Networking:
$ kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml
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- Check status of the control plane node: $ kubectl get nodes
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- In the Control Plane Node, create the token and copy the kubeadm join command (NOTE:The join command can also be found in the output from kubeadm init command):
$ kubeadm token create --print-join-command
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- In both Worker Nodes, paste the kubeadm join command to join the cluster. Use sudo to run it as root: $ sudo kubeadm join ...
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- In the Control Plane Node, view cluster status (Note: You may have to wait a few moments to allow all nodes to become ready):
$ kubectl get nodes