在python云堆栈modu中调试ansible跟踪可能的bug

Question

对于上载ssh密钥的Ansible任务，请考虑以下问题：

  File "/home/foo/.ansible/tmp/ansible-tmp-1539175437.69-201636907966313/AnsiballZ_cs_sshkeypair.py", line 113, in <module>
    _ansiballz_main()
  File "/home/foo/.ansible/tmp/ansible-tmp-1539175437.69-201636907966313/AnsiballZ_cs_sshkeypair.py", line 105, in _ansiballz_main
    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)
  File "/home/foo/.ansible/tmp/ansible-tmp-1539175437.69-201636907966313/AnsiballZ_cs_sshkeypair.py", line 48, in invoke_module
    imp.load_module('__main__', mod, module, MOD_DESC)
  File "/tmp/ansible_cs_sshkeypair_payload_Jb1ZG5/__main__.py", line 267, in <module>
  File "/tmp/ansible_cs_sshkeypair_payload_Jb1ZG5/__main__.py", line 258, in main
  File "/tmp/ansible_cs_sshkeypair_payload_Jb1ZG5/__main__.py", line 133, in register_ssh_key
  File "/tmp/ansible_cs_sshkeypair_payload_Jb1ZG5/__main__.py", line 211, in get_ssh_key
  File "/tmp/ansible_cs_sshkeypair_payload_Jb1ZG5/__main__.py", line 227, in _get_ssh_fingerprint
  File "/usr/local/lib/python2.7/dist-packages/sshpubkeys/keys.py", line 157, in hash_md5
    fp_plain = hashlib.md5(self._decoded_key).hexdigest()
TypeError: md5() argument 1 must be string or buffer, not None

fatal: [localhost]: FAILED! => {
    "changed": false, 
    "module_stderr": "Traceback (most recent call last):\n  File \"/home/foo/.ansible/tmp/ansible-tmp-1539175437.69-201636907966313/AnsiballZ_cs_sshkeypair.py\", line 113, in <module>\n    _ansiballz_main()\n  File \"/home/foo/.ansible/tmp/ansible-tmp-1539175437.69-201636907966313/AnsiballZ_cs_sshkeypair.py\", line 105, in _ansiballz_main\n    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\n  File \"/home/foo/.ansible/tmp/ansible-tmp-1539175437.69-201636907966313/AnsiballZ_cs_sshkeypair.py\", line 48, in invoke_module\n    imp.load_module('__main__', mod, module, MOD_DESC)\n  File \"/tmp/ansible_cs_sshkeypair_payload_Jb1ZG5/__main__.py\", line 267, in <module>\n  File \"/tmp/ansible_cs_sshkeypair_payload_Jb1ZG5/__main__.py\", line 258, in main\n  File \"/tmp/ansible_cs_sshkeypair_payload_Jb1ZG5/__main__.py\", line 133, in register_ssh_key\n  File \"/tmp/ansible_cs_sshkeypair_payload_Jb1ZG5/__main__.py\", line 211, in get_ssh_key\n  File \"/tmp/ansible_cs_sshkeypair_payload_Jb1ZG5/__main__.py\", line 227, in _get_ssh_fingerprint\n  File \"/usr/local/lib/python2.7/dist-packages/sshpubkeys/keys.py\", line 157, in hash_md5\n    fp_plain = hashlib.md5(self._decoded_key).hexdigest()\nTypeError: md5() argument 1 must be string or buffer, not None\n", 
    "module_stdout": "", 
    "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", 
    "rc": 1
}

当ssh密钥存在时，由于md5()参数可能丢失，这似乎是一些bug。在

在这张表格里不能准确地指出它是一个已知的问题。在

对于python2.x和3.x都会出现这个问题（下面是针对ubuntu16.04/18.04 LTS的Dockerfiles）。在

Ubuntu 16.04 LTS，Python 2

^{pr2}$

Ubuntu 18.04 LTS，Python 3

FROM ubuntu:18.04

ENV WORKDIR /work
WORKDIR $WORKDIR
COPY . $WORKDIR/example/


RUN mv example/.ssh/ ~/ && ls -alh ~/.ssh/ && \
    apt-get -y update && apt-get -y install software-properties-common && apt-add-repository ppa:ansible/ansible && \
    apt-get -y update && \
    apt-get -y install python3-pip && pip3 install ansible cs sshpubkeys && \
    echo "List installed Python packages:" && pip3 list && python3 --version && ansible --version

系统似乎删除了临时生成的Python脚本。有没有保留它们以供调试的选项？在

附加说明：example/.ssh/包含目标系统不知道的新SSH piblic密钥。在

假设：虽然最终的动态文件名为AnsiballZ_cs_sshkeypair.py，但它是否来自Pythoncs（apachecloudstackbindings）模块？在

Answer 1

默认情况下，临时脚本将被删除，因为它们基本上只是从Ansible主机传输的模块文件（包装在Ansiballz中）的副本。在这种情况下，我猜远程主机与Ansible主机相同，但这并不重要，因为概念是相同的。ansiballz包装模块的命名方案与您的假设基本相同。在

但实际上，您可以通过在playbook调用前添加ANSIBLE_KEEP_REMOTE_FILES=1来覆盖自动删除，如下所示：

ANSIBLE_KEEP_REMOTE_FILES=1 ansible-playbook <playbookname>.yml -vvv

这样就保留了ansiballz*.py，但模块本身作为某种base64字符串传递。我认为这没什么用。在

为了进一步调试，我建议您从github克隆Ansible存储库，然后再这样做（最好是在一个额外的venv中）

^{pr2}$

设置开发环境。然后可以使用Python解释器直接调用模块，并使用pdb等工具。我建议您准备以下格式的json文件。在

{"ANSIBLE_MODULE_ARGS": { "key1": "value1", "key2"... }}

然后您应该能够像这样调用模块：

python <module-name-plus-path> <json-file-plus-path>

我希望这有帮助！在

编辑：我忘了一件事。查看Ansible dev documentation。如果你真的想深入调查这件事，那将对你有很大帮助。在