CDP Private Cloud Base is supported on platforms with Security-Enhanced Linux (SELinux) enabled in permissive mode. However Cloudera recommends SELinux be disabled on all machines in the Hadoop cluster until the cluster is up and running.
The Linux command
getenforce returns the status of SELinux.
SELinux can be disabled on RHEL or CentOS by editing /etc/selinux/config and setting SELINUX=disabled. This change must be done as root (or with proper sudo access), and requires a reboot.