环境信息

ansible调用远程centos7的docker模块需要安装docker==4.4.4这个包。

"msg": "Failed to import the required Python library (Docker SDK for Python: docker above 5.0.0 (Python >= 3.6) or docker before 5.0.0 (Python 2.7) or docker-py (Python 2.6)) on k8s-node-56-166.by.com's Python /usr/bin/python. 
Please read the module documentation and install it 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, for example via `pip install docker` (Python >= 3.6) or `pip install docker==4.4.4` (Python 2.7) or `pip install docker-py` (Python 2.6). The error was: No module named requests.exceptions"

使用pip安装后，仍然报如下错误：

>>> import docker
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/docker/__init__.py", line 2, in <module>
    from .api import APIClient
  File "/usr/lib/python2.7/site-packages/docker/api/__init__.py", line 2, in <module>
    from .client import APIClient
  File "/usr/lib/python2.7/site-packages/docker/api/client.py", line 8, in <module>
    import websocket
  File "/usr/lib/python2.7/site-packages/websocket/__init__.py", line 20, in <module>
    from ._app import WebSocketApp
  File "/usr/lib/python2.7/site-packages/websocket/_app.py", line 23, in <module>
    import selectors
ImportError: No module named selectors
>>> qa
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>

报错的这一行代码来自

File "/usr/lib/python2.7/site-packages/websocket/_app.py", line 23, in <module>
    import selectors

这个文件来自websocket-client包。

观察详细的安装信息如下：

[root@k8s-node-56-164 ~]# pip install docker==4.4.4
Collecting docker==4.4.4
  Downloading https://files.pythonhosted.org/packages/c4/22/410313ad554477e87ec406d38d85f810e61ddb0d2fc44e64994857476de9/docker-4.4.4-py2.py3-none-any.whl (147kB)
    100% |████████████████████████████████| 153kB 636kB/s 
Requirement already satisfied (use --upgrade to upgrade): six>=1.4.0 in /usr/lib/python2.7/site-packages (from docker==4.4.4)
Requirement already satisfied (use --upgrade to upgrade): ipaddress>=1.0.16; python_version < "3.3" in /usr/lib/python2.7/site-packages (from docker==4.4.4)
Requirement already satisfied (use --upgrade to upgrade): backports.ssl-match-hostname>=3.5; python_version < "3.5" in /usr/lib/python2.7/site-packages (from docker==4.4.4)
Collecting requests!=2.18.0,>=2.14.2 (from docker==4.4.4)
  Downloading https://files.pythonhosted.org/packages/92/96/144f70b972a9c0eabbd4391ef93ccd49d0f2747f4f6a2a2738e99e5adc65/requests-2.26.0-py2.py3-none-any.whl (62kB)
    100% |████████████████████████████████| 71kB 827kB/s 
Collecting websocket-client>=0.32.0 (from docker==4.4.4)
  Downloading https://files.pythonhosted.org/packages/55/44/030ea47390896c8d6dc9995c8e9a4c5df3a161cd45416d88119036c73eda/websocket_client-1.2.1-py2.py3-none-any.whl (52kB)
    100% |████████████████████████████████| 61kB 815kB/s 
Collecting certifi>=2017.4.17 (from requests!=2.18.0,>=2.14.2->docker==4.4.4)
  Downloading https://files.pythonhosted.org/packages/05/1b/0a0dece0e8aa492a6ec9e4ad2fe366b511558cdc73fd3abc82ba7348e875/certifi-2021.5.30-py2.py3-none-any.whl (145kB)
    100% |████████████████████████████████| 153kB 740kB/s 
Collecting urllib3<1.27,>=1.21.1 (from requests!=2.18.0,>=2.14.2->docker==4.4.4)
  Downloading https://files.pythonhosted.org/packages/5f/64/43575537846896abac0b15c3e5ac678d787a4021e906703f1766bfb8ea11/urllib3-1.26.6-py2.py3-none-any.whl (138kB)
    100% |████████████████████████████████| 143kB 4.1MB/s 
Collecting idna<3,>=2.5; python_version < "3" (from requests!=2.18.0,>=2.14.2->docker==4.4.4)
  Downloading https://files.pythonhosted.org/packages/a2/38/928ddce2273eaa564f6f50de919327bf3a00f091b5baba8dfa9460f3a8a8/idna-2.10-py2.py3-none-any.whl (58kB)
    100% |████████████████████████████████| 61kB 732kB/s 
Collecting chardet<5,>=3.0.2; python_version < "3" (from requests!=2.18.0,>=2.14.2->docker==4.4.4)
  Downloading https://files.pythonhosted.org/packages/19/c7/fa589626997dd07bd87d9269342ccb74b1720384a4d739a1872bd84fbe68/chardet-4.0.0-py2.py3-none-any.whl (178kB)
    100% |████████████████████████████████| 184kB 610kB/s 
Installing collected packages: certifi, urllib3, idna, chardet, requests, websocket-client, docker
  Found existing installation: chardet 2.2.1
    Uninstalling chardet-2.2.1:
      Successfully uninstalled chardet-2.2.1
Successfully installed certifi-2021.5.30 chardet-4.0.0 docker-4.4.4 idna-2.10 requests-2.26.0 urllib3-1.26.6 websocket-client-1.2.1

docker==4.4.4依赖的websocket-client>=0.32.0即可。

实际的websocket-client版本是1.2.1

[root@k8s-node-56-164 ~]# pip show websocket-client
---
Metadata-Version: 2.1
Name: websocket-client
Version: 1.2.1
Summary: WebSocket client for Python with low level API options
Home-page: https://github.com/websocket-client/websocket-client.git
Author: liris
Author-email: liris.pp@gmail.com
Installer: pip
License: Apache-2.0
Location: /usr/lib/python2.7/site-packages
...

问题解决

将websocket-client降低版本至0.32.0。

[root@k8s-node-56-164 ~]# pip install websocket-client==0.32.0

验证成功,ansible再调用也成功了。

[root@k8s-node-56-164 ~]# python
Python 2.7.5 (default, Nov 16 2020, 22:23:17) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-44)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import docker
>>> exit