Frequently Asked Questions

Common Problems

In my startup logs I see ‘Aborting… Lemur cannot locate db encryption key, is LEMUR_ENCRYPTION_KEYS set?’

You likely have not correctly configured LEMUR_ENCRYPTION_KEYS. See Configuration for more information.

I am seeing Lemur’s javascript load in my browser but not the CSS.

Ensure that you are placing include mime.types; to your Nginx static file location. See Production for example configurations.

After installing Lemur I am unable to login

Ensure that you are trying to login with the credentials you entered during lemur init. These are separate from the postgres database credentials.

Running ‘lemur db upgrade’ seems stuck.

Most likely, the upgrade is stuck because an existing query on the database is holding onto a lock that the migration needs.

To resolve, login to your lemur database and run:

SELECT * FROM pg_locks l INNER JOIN pg_stat_activity s ON ( = WHERE waiting AND NOT granted;

This will give you a list of queries that are currently waiting to be executed. From there attempt to idenity the PID of the query blocking the migration. Once found execute:

select pg_terminate_backend(<blocking-pid>);

See for more.

How do I

… script the Lemur installation to bootstrap things like roles and users?

Lemur is a simple Flask (Python) application that runs using a utility runner. A script that creates a project and default user might look something like this:

# Bootstrap the Flask environment
from flask import current_app

from lemur.users.service import create as create_user
from lemur.roles.service import create as create_role
from lemur.accounts.service import create as create_account

role = create_role('aRole', 'this is a new role')
create_user('admin', 'password', 'lemur@nobody', True, [role]