Introduction to SELinux

# Check current mode
getenforce

# Detailed status
sestatus

# Check RHEL version
cat /etc/redhat-release

# Enforcing: policy applied, violations blocked
# Permissive: violations logged but not blocked
# Disabled: SELinux off (never use in production)

setenforce 0  # temp permissive
setenforce 1  # back to enforcing