Cloud Init for K8s and Docker

cloud-init.yaml

#cloud-config
package_update: true
package_upgrade: true
packages:
  # Update the apt package index and install packages needed to use the Docker and Kubernetes apt repositories over HTTPS
  - apt-transport-https
  - ca-certificates
  - curl
  - gnupg
  - lsb-release


# Let iptables see bridged traffic
# https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#letting-iptables-see-bridged-traffic
write_files:
 - path: /etc/modules-load.d/k8s.conf
   content: |
    br_netfilter  
 
 - path: /etc/sysctl.d/k8s.conf
   content: |
    net.bridge.bridge-nf-call-ip6tables = 1
    net.bridge.bridge-nf-call-iptables = 1


# create the docker group
groups:
  - docker

# Add default auto created user to docker group
system_info:
  default_user:
    groups: [docker]

runcmd:
 - modprobe br_netfilter # Load br_netfilter module.
 - curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg # Add Docker’s official GPG key
 - curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg # Download the Google Cloud public signing key:
 - echo "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null # set up the stable repository
 - echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list # Add the Kubernetes apt repository
 - apt-get update -y # Update apt package index
 - apt-get install -y docker-ce docker-ce-cli containerd.io kubelet kubeadm kubectl # Install Docker Engine, kubelet, kubeadm and kubectl 
 - apt-mark hold kubelet kubeadm kubectl # pin kubelet kubeadm kubectl version
 - sysctl --system # Reload settings from all system configuration files to take iptables configuration