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