PSA: If you update to CentOS 7.3 and see odd console or log errors like this resulting in a hung boot:
Failed to start Import network configuration from initramfs
work still pending FAILED Failed to start Login Service. See 'systemctl status systemd-logind.service' for details. FAILED Failed to start Authorization Manager. See 'systemctl status polkit.service' for details. DEPEND Dependency failed for Dynamic System Tuning Daemon.
then you have a problem with CentOS 7.3 and SE Linux 2.5.
The workarounds are surprisingly simple:
- don’t upgrade anything until CentOS 7.4 is released (verified by me on Sept. 17 on a Dell 1950) or
- add selinux=0 to the kernel boot line in the boot menu and/or grub.
Keywords: Virtualbox, linux, selinux, enforcing.