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