airflow

Generate a fernet key:

$ python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"
81HqDtbqAywKSOumSha3BhWNOdQ26slT6K0YaZeZyPs=

Paste it into your airflow.cfg.

fernet_key = 81HqDtbqAywKSOumSha3BhWNOdQ26slT6K0YaZeZyPs=