There’s some good information on CoreOS security in OpenShift’s security guide (page 35): https://access.redhat.com/system/files/redhat_openshift_security_guide_2_for_screen_0.pdf#page35
There’s some good information on CoreOS security in OpenShift’s security guide (page 35): https://access.redhat.com/system/files/redhat_openshift_security_guide_2_for_screen_0.pdf#page35