title: What is the impact of changing rails secret_key_base on production?
body: <p>As far as I know, secret_key_base is only used for signing cookies and changing secret_key_base will cause existing cookies to become invalid. I need to change secret_key_base on production, having existing users logged out is acceptable behavior but I am concerned about possible other side effects. Will the old cookies simply be deleted/replaced when they next visit the website or will they hang around and cause issues? Are there any other changes that will occur other than users being logged out?</p>