When booting up your linux server it stops halfway through and displays the message:
Your default context is user_U:system r:unconfined_t.
Do you want a different one?
The system then waits for you to make a decision before continuing the boot process.
This message is a result of features that come with NSA Security Enhanced Linux.
SELinux uses security contexts to enforce policies. These contexts usually comprise of four fields: User field:Role field:Type Field:Security Level Field.
User-U is reserved for unprivileged users, and system_r is for role_based application roles. Unconfined_t simply means these processes are mostly not being confined by the SELinux policy but are still governed by standard Linux/UNIX security.
If you would like to bypass this prompt on startup, make the following change in /etc/selinux/config:
To learn more about SE Linux, go to: