Setting a session limit allows administrators to limit the number of simultaneous sessions per user or per IP address.
In Ansible Tower, a session is created for each browser that a user uses to log in, which forces the user to log out any extra sessions after they exceed the administrator-defined maximum.
Session limits may be important, depending on your particular setup. For example, perhaps you only want a single user on your system with a single login per device (where the user could log in on his work laptop, phone, or home computer). In such a case, you would want to create a session limit equal to 1 (one). If the user logs in on his laptop, for example, then logs in using his phone, his laptop session expires (times out) and only the login on the phone persists.
While session counts can be very limited, they can also be expanded to cover as many session logins as are needed by your organization.
When a user logs in and their login results in other users being logged out, the session limit has been reached and those users who are logged out are notified as to why the logout occurred.
To make changes to your session limits, navigate to
/etc/tower/conf.d and edit the
sessions.py file or use the Browsable API if you are comfortable with making REST requests. The settings you should change are detailed below:
# Seconds before auth tokens expire. SESSION_COOKIE_AGE = 1800 # Maximum number of per-user valid, concurrent tokens. # -1 is unlimited SESSIONS_PER_USER = -1 # Enable / Disable HTTP Basic Authentication used in the API browser # Note: Session limits are not enforced when using HTTP Basic Authentication. AUTH_BASIC_ENABLED = True
To make the best use of session limits, disable
AUTH_BASIC_ENABLED by changing the value to
False, as it falls outside of the scope of session limit enforcement.
Proactive session limits will kick the user out when the session is idle. It is strongly recommended that you do not set the session limit to anything less than 1 minute, as doing so will break your Ansible Tower instance.