Systems Administration (Ops)

If you are an advanced user and you’re going to run a PANDA server, you may want to know how it all works. This page lays out the users, services and files that are part of the standard PANDA setup.

This might also be thought of as a guide to what you may need to change in the event you want to run PANDA in a non-standard configuration.

Users

panda

Runs the uwsgi and celeryd services and owns their logs. Owns /var/lib/panda/media (compressed assets) and /var/lib/panda/uploads (uploaded files). Only this user should be used to execute Django management commands, etc:

sudo -u panda -E python manage.py shell

Note

Note when executing command as the panda user, it’s often necessary to use the -E option to sudo, so that the DEPLOYMENT_TARGET environment variable will be preserved.

postgres

Runs the postgresql service and owns its database files and logs.

root

Owns everything else, including the panda source code in /opt/panda.

solr

Runs the solr service and owns its files (/opt/solr), indices and logs.

ubuntu

The standard Ubuntu login user. Must be used to SSH into the system and run sudo. Has read-only access to files and logs, but can not execute any system commands.

www-data

Runs the nginx service and owns its logs.

Services

celeryd

Task processing.

nginx

Web server. Runs on port 80.

postgresql

Database. Runs on port 5432 locally. Not accessible from remote hosts.

solr

Search engine. Runs on 8983. Not accessible from remote hosts.

uwsgi

Python application server. Runs over a socket at /var/run/uwsgi/wsgi.sock.

Files

  • /var/lib/panda/media - compressed assets
  • /var/lib/panda/uploads - file uploads
  • /opt/panda - application source code
  • /opt/solr - Solr application
  • /var/log/celeryd - destination for celery logs if output was not captured and routed to panda logs (exists only as a failsafe)
  • /var/log/nginx - destination for access logs
  • /var/log/panda - destination for application logs (errors and task processing)
  • /var/log/uwsgi.log - destination for uwsgi logs (normally just startup and shutdown)
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