inits.cloud

Kubernetes Worker Node

Prepares a server to join a Kubernetes cluster as a worker node

Script Author

Rowan de Haas's avatar
Rowan de Haas
Script Author

Script Details

Created 3 months ago
Size 2 KB

Tags

Script Content

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#cloud-config
package_update: true
package_upgrade: true

packages:
  - apt-transport-https
  - ca-certificates
  - curl
  - gnupg
  - lsb-release

write_files:
  - path: /etc/modules-load.d/k8s.conf
    content: |
      overlay
      br_netfilter

  - path: /etc/sysctl.d/k8s.conf
    content: |
      net.bridge.bridge-nf-call-iptables  = 1
      net.bridge.bridge-nf-call-ip6tables = 1
      net.ipv4.ip_forward                 = 1

  - path: /etc/containerd/config.toml
    content: |
      [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
          SystemdCgroup = true

runcmd:
  # Load kernel modules
  - modprobe overlay
  - modprobe br_netfilter
  - sysctl --system
  
  # Install containerd
  - curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
  - echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null
  - apt-get update
  - apt-get install -y containerd.io
  
  # Configure containerd
  - mkdir -p /etc/containerd
  - containerd config default | tee /etc/containerd/config.toml
  - systemctl restart containerd
  - systemctl enable containerd
  
  # Install kubeadm, kubelet, kubectl
  - curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
  - echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | tee /etc/apQt/sources.list.d/kubernetes.list
  - apt-get update
  - apt-get install -y kubelet kubeadm kubectl
  - apt-mark hold kubelet kubeadm kubectl
  
  # Enable kubelet
  - systemctl enable kubelet

How to Use This Script

Cloud Provider Examples

Amazon EC2

aws ec2 run-instances
  --image-id ami-12345678
  --instance-type t3.micro
  --user-data file://script.yaml

DigitalOcean

doctl compute droplet create
  --image ubuntu-22-04-x64
  --size s-1vcpu-1gb
  --user-data-file script.yaml
  my-droplet

Google Cloud

gcloud compute instances create
  my-instance
  --metadata-from-file
  user-data=script.yaml