Satellite Capsule pulp_streamer.service entered failed state

Issue

• After a new installation of Satellite Capsule 6.8.2 on a RHEL 7.9 server, pulp_streamer.service fails to start.

• Output of satellite-maintain service status command reports failed state for pulp_streamer.service.

  # satellite-maintain service status
  / displaying pulp_streamer                                                      
  * pulp_streamer.service - The Pulp lazy content loading streamer
     Loaded: loaded (/usr/lib/systemd/system/pulp_streamer.service; enabled; vendor preset: disabled)
     Active: failed (Result: exit-code) since Tue 2021-01-12 22:05:46 +0530; 16min ago
    Process: 10867 ExecStart=/usr/bin/pulp_streamer --nodaemon --syslog --prefix=pulp_streamer --pidfile= --python /usr/share/pulp/wsgi/streamer.tac (code=exited, status=1/FAILURE)
   Main PID: 10867 (code=exited, status=1/FAILURE)
  
  Jan 12 22:05:46 rh-capsule pulp_streamer[11977]: File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 3007, in <module>
  Jan 12 22:05:46 rh-capsule pulp_streamer[11977]: working_set.require(__requires__)
  Jan 12 22:05:46 rh-capsule pulp_streamer[11977]: File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 728, in require
  Jan 12 22:05:46 rh-capsule pulp_streamer[11977]: needed = self.resolve(parse_requirements(requirements))
  Jan 12 22:05:46 rh-capsule pulp_streamer[11977]: File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 626, in resolve
  Jan 12 22:05:46 rh-capsule pulp_streamer[11977]: raise DistributionNotFound(req)
  Jan 12 22:05:46 rh-capsule pulp_streamer[11977]: pkg_resources.DistributionNotFound: twisted
  Jan 12 22:05:46 rh-capsule systemd[1]: pulp_streamer.service: main process exited, code=exited, status=1/FAILURE
  Jan 12 22:05:46 rh-capsule systemd[1]: Unit pulp_streamer.service entered failed state.
  Jan 12 22:05:46 rh-capsule systemd[1]: pulp_streamer.service failed.
  [...]
  
  / All services displayed                                              [FAIL]    
  Some services are not running (pulp_streamer)
  --------------------------------------------------------------------------------
  Scenario [Status Services] failed.
  
  The following steps ended up in failing state:
  
    [service-status]
  

• The service may also fail with:

  Nov 04 16:28:25 capsule.example.com pulp_streamer[26491]: File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 653, in _build_master
  Nov 04 16:28:25 capsule.example.com pulp_streamer[26491]: return cls._build_from_requirements(__requires__)
  Nov 04 16:28:25 capsule.example.com pulp_streamer[26491]: File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 666, in _build_from_requirements
  Nov 04 16:28:25 capsule.example.com pulp_streamer[26491]: dists = ws.resolve(reqs, Environment())
  Nov 04 16:28:25 capsule.example.com pulp_streamer[26491]: File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 839, in resolve
  Nov 04 16:28:25 capsule.example.com pulp_streamer[26491]: raise DistributionNotFound(req, requirers)
  Nov 04 16:28:25 capsule.example.com pulp_streamer[26491]: pkg_resources.DistributionNotFound: The 'urllib3<1.24,>=1.21.1' distribution was not found and is requir... requests
  Nov 04 16:28:25 capsule.example.com systemd[1]: pulp_streamer.service: main process exited, code=exited, status=1/FAILURE
  Nov 04 16:28:25 capsule.example.com systemd[1]: Unit pulp_streamer.service entered failed state.
  Nov 04 16:28:25 capsule.example.com systemd[1]: pulp_streamer.service failed.
  Hint: Some lines were ellipsized, use -l to show in full.