1)先保证3个机器(1个master2个worker)都启动!!!

2)输入ansible --version，没有反应则会提示安装，直接安装即可!!!

3)验证版本

[root@bogon mianmi]# python --version
Python 3.9.19


[root@bogon mianmi]# ansible --version
ansible [core 2.14.18]
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/root/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.9/site-packages/ansible
  ansible collection location = /root/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible
  python version = 3.9.19 (main, Sep 11 2024, 00:00:00) [GCC 11.5.0 20240719 (Red Hat 11.5.0-2)] (/usr/bin/python3)
  jinja version = 3.1.2
  libyaml = True

4)master机器生成一下

[root@bogon mianmi]# ssh-keygen -t ed25519 -C "ansible-master" -f ~/.ssh/id_ed25519

5)master机器上查看下~/.ssh下，证明生成完毕

[root@bogon .ssh]# cat id_ed25519.pub 
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINcv3wV16QWvOQodOAOncKI6I499cRjud+Kovhu7C3fW ansible-master

6)准备好主机清单

hosts.int

[workers]
192.168.3.204
192.168.3.205

[all:vars]
ansible_user=root
ansible_port=22
ansible_ssh_common_args='-o StrictHostKeyChecking=accept-new'

7)准备好剧本

push_ssh_key.yml 

- hosts: workers
  gather_facts: no
  tasks:
    - name: install master's public key to workers
      authorized_key:
        user: "{{ ansible_user }}"
        state: present
        key: "{{ lookup('file', '~/.ssh/id_ed25519.pub') }}"

8)执行

[root@bogon mianmi]# ansible-playbook -i hosts.ini push_ssh_key.yml -k
SSH password: 
[WARNING]: Collection ansible.posix does not support Ansible version 2.14.18

PLAY [workers] *******************************************************************************************************************************

TASK [install master's public key to workers] ************************************************************************************************
ok: [192.168.3.204]
changed: [192.168.3.205]

PLAY RECAP ***********************************************************************************************************************************
192.168.3.204              : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
192.168.3.205              : ok=1    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

9)验证下，发现都已经成功

[root@bogon mianmi]# ansible -i hosts.ini workers -m ping
192.168.3.204 | SUCCESS => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python3"
    },
    "changed": false,
    "ping": "pong"
}
192.168.3.205 | SUCCESS => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python3"
    },
    "changed": false,
    "ping": "pong"
}

总结：

   可见ansible安装和使用都非常简单，安装就是:输入，不存在则自动安装。

   接着写好清单和剧本，一键执行即可!!!

理解ansible的幂等性