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