How many packages have been installed for kernel. Loading the nbd module prompts me that I can't find this module?

problems encountered when using KVM on CentOS 7.5 when partitioning after creating an image.

Command: modprobe nbd
error: modprobe: FATAL: Module nbd not found.

the solution on the Internet is to install several packages related to kernel, but I already have these packages on my CentOS7. What"s going on?

how to solve this problem?

Kvm
Jun.23,2021

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