qemu-img convert -f raw -O qcow2 nix.img ruiynix.qcow2
1,yum createrepo
2,
3,exportfs
4,
/srv/cloud/eucalyptus/var/datastores *(rw,sync,no_subtree_check,root_squash)
/opt/ByRuiy *(rw,sync,no_subtree_check,root_squash)
192.168.1.145:/srv/cloud/eucalyptus/var/datastores /srv/cloud/eucalyptus/var/datastores nfs soft,intr,rsize=8192,wsize=8192,noauto