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