Failed to add node to cluster

[nexus]

Problem description:
An error is reported when adding a physical machine to the cluster:
cannot be added to cluster because qemu/libvirt version does not match

Problem analysis:
libvirt qemu version does not match

Problem handling process:
check whether different ISOs are mixed

In a virtualization cluster, the core virtualization components(including QEMU and libvirt) of all nodes must maintain the same version.