# Test Acme Challenges: No module named http.client

**URL:** https://discourse.roots.io/t/test-acme-challenges-no-module-named-http-client/24525
**Category:** trellis
**Tags:** ansible
**Created:** 2023-01-06T15:34:15Z
**Posts:** 6

## Post 1 by @Twansparant — 2023-01-06T15:34:15Z

I’m excited to try out the new [github-oauth composer authentication](https://github.com/roots/trellis/pull/1413) support in the latest Trellis version!

I just upgraded my trellis project to the latest version **1.19.0** , re-init the project with destroying my local box and running `trellis init`.  
Locally everything is working fine again, however when I try to re-provision my remote server I get the following error during the **letsencrypt : Test Acme Challenges** task:

```
TASK [letsencrypt : Test Acme Challenges] **************************************
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: ImportError: No module named http.client
failed: [159.65.192.172] (item=example.com) => {...}, "module_stderr": "Traceback (most recent call last):\n File \"<stdin>\", line 102, in <module>\n File \"<stdin>\", line 94, in _ansiballz_main\n File \"<stdin>\", line 40, in invoke_module\n File \"/usr/lib/python2.7/runpy.py\", line 188, in run_module\n fname, loader, pkg_name)\n File \"/usr/lib/python2.7/runpy.py\", line 82, in _run_module_code\n mod_name, mod_fname, mod_loader, pkg_name)\n File \"/usr/lib/python2.7/runpy.py\", line 72, in _run_code\n exec code in run_globals\n File \"/tmp/ansible_test_challenges_payload_N_vGBn/ansible_test_challenges_payload.zip/ansible/modules/test_challenges.py\", line 5, in <module>\nImportError: No module named http.client\n", "module_stdout": "", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1}
...ignoring

TASK [letsencrypt : Notify of challenge failures] ******************************
fatal: [159.65.192.172]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'failed_hosts'\n\nThe error appears to be in '/Users/username/path/to/project/trellis/roles/letsencrypt/tasks/nginx.yml': line 65, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Notify of challenge failures\n ^ here\n"}
```

The error `No module named http.client` is caused since the **test\_challenges** seems to be using **python 2.7** while `http.client` was added in **python 3**?

I have no reference to any python 2.7 instance?  
With **pyenv** I have set **python 3.9.14** as my global version.

When I run `trellis exec ansible --version`, it outputs:

```
ansible 2.10.17
  config file = /Users/username/path/to/project/trellis/ansible.cfg
  configured module search path = ['/Users/username/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /Users/username/path/to/project/trellis/.trellis/virtualenv/lib/python3.9/site-packages/ansible
  executable location = /Users/username/path/to/project/trellis/.trellis/virtualenv/bin/ansible
  python version = 3.9.14 (main, Jan 6 2023, 15:39:05) [Clang 14.0.0 (clang-1400.0.29.202)]
```

That also displays **python 3.9.14**?

The [test\_challenges.py file](https://github.com/roots/trellis/blob/676e9b6a9d396385a567b852153afca614b2fba5/roles/letsencrypt/library/test_challenges.py) where `http.client` gets imported also has a [**shebang line**](https://en.wikipedia.org/wiki/Shebang_(Unix)) that points to my python3 path.

Any thoughts why this is happening?  
I have never seen this one before, thanks!

---

## Post 2 by @strarsis — 2023-01-07T13:11:01Z

What does [`trellis check`](https://github.com/roots/trellis-cli#usage) output?

---

## Post 3 by @Twansparant — 2023-01-07T19:25:11Z

> [@strarsis](#):
>
> [`trellis check`](https://github.com/roots/trellis-cli#usage)

```
Checking Trellis requirements...

Required:

[✓] Python [>= 3.8.0]: 3.9.14

Optional:

[✓] Vagrant [>= 2.1.0]: 2.2.18
[X] VirtualBox [>= 4.3.10]: not installed
```

So also the correct python version?  
The paths in the error seem to be external:

```
/tmp/ansible_test_challenges_payload_N_vGBn/ansible_test_challenges_payload.zip/ansible/modules/test_challenges.py
```

And

```
File \"/usr/lib/python2.7/runpy.py\
```

Can’t find any reference to these files locally or in trellis?  
Thanks!

**P.S.**  
When I run `python --version` on the remote server, it outputs `Python 2.7.18`  
and `python3 --version` gives me `Python 3.8.10`?

The original provisioning of the server was done with **Trellis 1.13.0** , could it be this was done with Python 2.7 and re-provisioning does not set the default to **python3** or something along those lines?

When I rollback [this commit](https://github.com/roots/trellis/commit/046881a7bd397d66582c4ee29e763258138e0cf1), re-provisioning works again?

---

## Post 5 by @swalkinshaw — 2023-01-10T01:44:08Z

As you last suspected, this error is only related to the version of Python on your server, nothing to do with your local machine.

> [@Twansparant](#):
>
> The original provisioning of the server was done with **Trellis 1.13.0** , could it be this was done with Python 2.7 and re-provisioning does not set the default to **python3** or something along those lines?

Yeah this could be causing issues. I’m assuming both Python 2 and Python 3 are installed. You have a few options:

1. try removing python2, leaving just python3
2. install the `python-is-python3` package (either manually or defining `apt_packages_custom` with it)

Though I’d still expect this to work due to the `/usr/bin/python3` shebang, and as you said, that properly returns `Python 3.8.10` :thinking:

---

## Post 6 by @Twansparant — 2023-01-10T12:36:38Z

Thanks @swalkinshaw, I can confirm adding this in **group\_vars/all/main.yml** :

```
apt_packages_custom:
  python-is-python3: "{{ apt_package_state }}"
```

Will fix this issue for re-provisioning servers that still use **python 2.7** as default with trellis 1.19+.  
After adding the `python-is-python3` package, the server now uses **python 3.8.10**!