安装Airflow可以使用Ansible自动化工具，以下是一个示例的Ansible Playbook来安装Airflow：

---
- name: Install Airflow
  hosts: all
  become: yes
  vars:
    airflow_version: "2.1.0"
    airflow_home: "/opt/airflow"
  
  tasks:
    - name: Install Python pip
      apt:
        name: python3-pip
        state: present
  
    - name: Install Airflow dependencies
      apt:
        name: "{{ item }}"
        state: present
      with_items:
        - build-essential
        - libssl-dev
        - libffi-dev
        - python3-dev
        - python3-venv
  
    - name: Create Airflow virtual environment
      command: python3 -m venv "{{ airflow_home }}"
  
    - name: Activate Airflow virtual environment
      command: source "{{ airflow_home }}/bin/activate"
  
    - name: Upgrade pip
      pip:
        name: pip
        state: latest
        virtualenv: "{{ airflow_home }}"
  
    - name: Install Airflow
      pip:
        name: apache-airflow=={{ airflow_version }}
        virtualenv: "{{ airflow_home }}"
  
    - name: Initialize Airflow
      command: airflow db init
      environment:
        AIRFLOW_HOME: "{{ airflow_home }}"
  
    - name: Start Airflow scheduler
      command: airflow scheduler -D
      environment:
        AIRFLOW_HOME: "{{ airflow_home }}"
  
    - name: Start Airflow webserver
      command: airflow webserver -D
      environment:
        AIRFLOW_HOME: "{{ airflow_home }}"

这个Ansible Playbook会在所有主机上安装Airflow。你可以将上述代码保存为一个YAML文件，比如install_airflow.yaml。

然后，可以使用以下命令运行该Playbook：

ansible-playbook install_airflow.yaml

请注意，上述代码假设你已经安装了Ansible，并且具有适当的权限来在目标主机上安装软件包和执行命令。