在ansible中动态添加主机到清单

Question

我尝试使用ansible 2.11.6将本地KVM机器动态添加到ansible清单中。

ansible [core 2.11.6]
  config file = /home/ansible/ansible.cfg
  configured module search path = ['/home/ansible/library']
  ansible python module location = /usr/local/lib/python3.9/dist-packages/ansible
  ansible collection location = /home/ansible/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/local/bin/ansible
  python version = 3.9.2 (default, Feb 28 2021, 17:03:44) [GCC 10.2.1 20210110]
  jinja version = 3.0.2
  libyaml = True

我成功地创建了KVM，启动它，等待端口22，并尝试使用播放“A”中的以下任务将其添加到清单中：

- name: "{{libvirt_maschine_name}}: Add VM to in-memory inventory"
  local_action:
    module: add_host
    name: "{{libvirt_maschine_name}}"
    groups: libvirt
    ansible_ssh_private_key_file: "{{ansible_user_home}}/.ssh/{{libvirt_maschine_name}}-ssh.key"
    ansible_default_ipv4: "{{vm_ip}}"
    ansible_ssh_common_args: '-o StrictHostKeyChecking=no'
    ansible_host: "{{vm_ip}}"

当我在Play "B“中输出hostvars的内容时，我看到了预期的组和主机名：

...
            "group_names": [
                "libvirt"
            ],
            "groups": {
                "all": [
                    "ansible",
                    "k8smaster"
                ],
                "libvirt": [
                    "k8smaster"
                ],
                "local_ansible": [
                    "ansible"
                ],
                "ungrouped": []
            },
...

当我添加

- debug: var=group_names
- debug: var=play_hosts

对于我的游戏"B"，我只得到我的库存的静态信息。

TASK [debug] ****************************************************************************************************************************************************************************************************
ok: [ansible] => {
    "group_names": [
        "local_ansible"
    ]
}

TASK [debug] ****************************************************************************************************************************************************************************************************
ok: [ansible] => {
    "play_hosts": [
        "ansible"
    ]
}

我的inventory.ini看起来像

[all]
ansible ansible_host=localhost

[local_ansible]
ansible ansible_host=localhost

[local_ansible:vars]
ansible_ssh_private_key_file=~/.ssh/ansible.key
ansible_ssh_common_args='-o StrictHostKeyChecking=no'
ansible_user=ansible

下面是一个最小的例子：

---

- name: "Play A"
  hosts: all
  become: yes
  gather_facts: yes

  tasks:

    - name: "Import variables from file"
      include_vars:
        file: k8s-single-node_vars.yaml

    - name: "Do some basic stuff"
      include_role:
        name: ansible-core

    - name: "Add VM to in-memory inventory"
      add_host:
        name: "myMaschine"
        groups: myGroup
        ansible_ssh_private_key_file: "test.key"
        ansible_default_ipv4: "192.168.1.1"
        ansible_ssh_common_args: '-o StrictHostKeyChecking=no'
        ansible_host: "192.168.1.1"

- name: "Play B"
  hosts: all
  become: yes
  gather_facts: no
  tasks:

    - debug: var=hostvars
    - debug: var=group_names
    - debug: var=play_hosts

    - name: test-ping
      ping:

因此，我不能对VM运行任何任务，因为ansible完全忽略它们。ping命令只是对主机"ansible“起作用。你知道我做错了什么吗？

Answer 1

Minimal inventory和minimal playbook表明，使用Python 3.8，一切都如预期的那样工作。

您正在使用Python 3.9运行ansible，请尝试降级。

shell> ansible --version
ansible [core 2.11.5]
...
python version = 3.8.5 (default, Jan 27 2021, 15:41:15) [GCC 9.3.0]
jinja version = 3.0.1

shell> cat inventory.ini
localhost

shell> cat playbook.yml
---
- name: Play A
  hosts: all
  gather_facts: false
  tasks:
    - add_host:
        name: myMaschine
        groups: myGroup

- name: Play B
  hosts: all
  gather_facts: false
  tasks:
    - debug:
        var: group_names
    - debug:
        var: ansible_play_batch

shell> ansible-playbook -i inventory.ini playbook.yml

PLAY [Play A] ***************************************

TASK [add_host] *************************************
changed: [localhost]

PLAY [Play B] ***************************************

TASK [debug] ****************************************
ok: [myMaschine] =>
  group_names:
  - myGroup
ok: [localhost] =>
  group_names:
  - ungrouped

TASK [debug] ****************************************
ok: [myMaschine] =>
  ansible_play_batch:
  - myMaschine
  - localhost
ok: [localhost] =>
  ansible_play_batch:
  - myMaschine
  - localhost

PLAY RECAP ******************************************
localhost:  ok=3 changed=1 unreachable=0 failed=0 ...
myMaschine: ok=2 changed=0 unreachable=0 failed=0 ...

special variable play_hosts已弃用，但仍在运行，即这不是问题的原因。

Answer 2

找到了解决方案。我使用limit选项将执行限制到本地主机。从上周开始，我使用了一个旧版本的ansible，它使用了我动态添加的额外主机。对于当前版本的Ansible，需要将新主机添加到limit选项中。使用"--limit ansible，libvirt“可以工作(当新主机是libvirt组的一部分时)。