帮我写个ansible-playbook 安装 k8s 的文档

当然可以，以下是一个简单的ansible-playbook安装k8s的文档：

---

- hosts: kubernetes-nodes
become: true

tasks:

- name: 禁用swap
command: swapoff -a
become: true

- name: 安装Docker
apt:
name: docker.io
state: present
become: true

- name: 安装Kubernetes依赖包
apt:
name: apt-transport-https
ca-certificates
curl
software-properties-common
state: present
become: true

- name: 添加Kubernetes签名密钥
apt_key:
url: https://packages.cloud.google.com/apt/doc/apt-key.gpg
state: present
become: true

- name: 添加Kubernetes APT存储库
apt_repository:
repo: deb https://apt.kubernetes.io/ kubernetes-xenial main
state: present
filename: kubernetes.list
update_cache: yes
become: true

- name: 更新APT缓存
apt:
update_cache: yes
become: true

- name: 安装Kubernetes Master组件
apt:
name: kubelet kubeadm kubectl
state: present
become: true

- name: 启动并设置kubelet服务
systemd:
name: kubelet.service
enabled: yes
state: started
become: true

通过运行此playbook，您可以成功在目标主机上安装k8s。希望可以对您有所帮助！