ModuleNotFoundError: No module named 'flask' on RHEL 8

[bschonec]

After days of attempting to solve the problem myself I'm forced to realize that I don't have the skills to debug Python or Apache.

On a brand new RHEL8 system with @minimal installed, I am unable to get Puppetboard installed properly due to an error about the flask module not being found.

Using a simple:

class { 'puppetboard':
  manage_git        => true,       
  manage_virtualenv => true,
}

Apache barks with:

[Tue Mar 29 08:57:24.729351 2022] [wsgi:error] [pid 6074] [remote 1.17.1.5:58516] mod_wsgi (pid=6074): Failed to exec Python script file '/srv/puppetboard/puppetboard/wsgi.py'.
[Tue Mar 29 08:57:24.729453 2022] [wsgi:error] [pid 6074] [remote 1.17.1.5:58516] mod_wsgi (pid=6074): Exception occurred processing WSGI script '/srv/puppetboard/puppetboard/wsgi.py'.
[Tue Mar 29 08:57:24.729764 2022] [wsgi:error] [pid 6074] [remote 1.17.1.5:58516] Traceback (most recent call last):
[Tue Mar 29 08:57:24.729823 2022] [wsgi:error] [pid 6074] [remote 1.17.1.5:58516]   File "/srv/puppetboard/puppetboard/wsgi.py", line 14, in <module>
[Tue Mar 29 08:57:24.729831 2022] [wsgi:error] [pid 6074] [remote 1.17.1.5:58516]     from puppetboard.app import app as application
[Tue Mar 29 08:57:24.729840 2022] [wsgi:error] [pid 6074] [remote 1.17.1.5:58516]   File "/srv/puppetboard/puppetboard/puppetboard/app.py", line 7, in <module>
[Tue Mar 29 08:57:24.729845 2022] [wsgi:error] [pid 6074] [remote 1.17.1.5:58516]     from flask import render_template, Response
[Tue Mar 29 08:57:24.729863 2022] [wsgi:error] [pid 6074] [remote 1.17.1.5:58516] ModuleNotFoundError: No module named 'flask'

Now, Puppetboard does seem to install properly but it's the Python module (I hope I'm describing it properly) that's giving me trouble.

Apache is running, but I get the following from curl/browser:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at [no address given] to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

A manual run of the WSGI yeilds:

[root@rhel8gold ~]# python3.8 /srv/puppetboard/puppetboard/wsgi.py
Traceback (most recent call last):
  File "/srv/puppetboard/puppetboard/wsgi.py", line 14, in <module>
    from puppetboard.app import app as application
  File "/srv/puppetboard/puppetboard/puppetboard/app.py", line 7, in <module>
    from flask import render_template, Response
ModuleNotFoundError: No module named 'flask'

It's been about four years since I've implemented a Puppet environment so I'm a bit rusty. I've tried the recommendations here:

#527

and here:

#582

but to no avail.

I've had even less success with RHEL7.

SELinux is off and the local firewall allows incoming TCP/80.

Here's my apache vhost config:

<VirtualHost *:80>
  ServerName rhel8gold-puppetboard

  ## Vhost docroot
  DocumentRoot "/srv/puppetboard/puppetboard"

  ## Directories, there should at least be a declaration for /srv/puppetboard/puppetboard

  <Directory "/srv/puppetboard/puppetboard">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride None
    Require all granted
  </Directory>

  ## Logging
  ErrorLog "/var/log/httpd/rhel8gold-puppetboard_error.log"
  ServerSignature Off
  CustomLog "/var/log/httpd/rhel8gold-puppetboard_access.log" combined

  ## WSGI configuration
  WSGIDaemonProcess puppetboard group=puppetboard python-home=/srv/puppetboard/virtenv-puppetboard threads=5 user=puppetboard
  WSGIProcessGroup puppetboard
  WSGIScriptAlias / "/srv/puppetboard/puppetboard/wsgi.py"
</VirtualHost>

[gdubicki]

Hi @bschonec!

Please recreate the issue in voxpupuli/puppet-puppetboard as it’s a problem with the module, not the app.