配置virt-install的时候出现virt-install: error: no such option: --graphics

virt-install \

--name  centos6.8_1 \

--ram 512 \

--disk path=/db/kvm/centos6.8_1.img,size=20 \

--vcpus 1 \

--os-type linux \

--os-variant rhel6 \

--network bridge=br0 \

--graphics none \

--console pty,target_type=serial \

--location 'http://mirrors.163.com/centos/6.8/os/i386/' \

--extra-args 'console=ttyS0,115200n8 serial'