openvSwitch vagrant libvirt-vagrant ubuntu ovs x509 net-scripts 도커 bind9 리눅스설정 ceph-osd klosedstack nvidia-smi vagrant-libvirt BPF kubeadm docker 도커 레지스트리 bpf_trace_printk dns ovpn yt-dlp jaeger-ceph ceph ebpf nvcc localGPT libvirt uprobe 쿠버네티스 인증서