python - Ansible 失败并出现 ModuleNotFoundError : No module named 'pexpect'

Question

我有三台主机，都运行最新更新的 Ubuntu 18.04:

• master 和 staging 是我自己从 Ubuntu 18.04 镜像安装的主机。
• prod 是我从提供商处租用的主机，因此除了选择 Ubuntu 18.04 之外，我无法控制基本安装。
• master 已安装 Ansible。

ansible --version 产生:

ansible 2.9.6
  config file = /home/marco/Desktop/playbook/ansible.cfg
  configured module search path = [u'/home/marco/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/dist-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.17 (default, Nov  7 2019, 10:07:09) [GCC 7.4.0]

ansible.cfg 包含 interpreter_python = auto 行。

我的剧本在使用目标主机登台运行时运行良好。但是当使用目标主机 prod 运行时，运行 expect 时会失败模块:

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: ModuleNotFoundError: No module named 'pexpect'
fatal: [prod]: FAILED! => {"changed": false, "msg": "Failed to import the required Python library (pexpect) on prod's Python /usr/bin/python3. Please read module documentation and install in the appropriate location. If the required library is installed, but Ansible is using the wrong Python interpreter, please consult the documentation on ansible_python_interpreter"}

我试图通过在 master 上安装库来解决问题

apt-get install python-pexpect
apt-get install python-pip
pip install pexpect

然后添加

- name: Install packages
  apt:
   name:
      - python-pexpect
      - python-pip
- name: Install Python modules
  command: pip install pexpect

到剧本，但没有帮助。

Answer 1

试试内置的 pip Ansble 模块，它会检测被控节点上使用的是哪个版本的 pip Ansible。

    - name: Install pip
      apt:
        update_cache: yes
        name:
          - python3-pip

    - name: Install pexpect
      pip:
        name: pexpect