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