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