zfs module not found on centos after restart

After I rebooted a CentOS server, ZFS does not work:

$ sudo zfs listThe ZFS modules are not loaded.Try running '/sbin/modprobe zfs' as root to load them.$ sudo modprobe zfsmodprobe: FATAL: Module zfs not found.

My OS version is CentOS Linux release 7.2.1511 (Core) and uname -r prints 3.10.0-327.18.2.el7.x86_64.

I noticed that some packages seemed to be updated automatically when the machine booted up - I found the following entries in /var/log/yum.log:

Feb 28 10:11:17 Updated: epel-release-7-9.noarchFeb 28 10:11:29 Updated: openblas-openmp64-0.2.19-4.el7.x86_64Feb 28 10:11:30 Updated: openblas-threads64_-0.2.19-4.el7.x86_64Feb 28 10:11:31 Updated: openblas-openmp-0.2.19-4.el7.x86_64Feb 28 10:11:32 Updated: openblas-serial64_-0.2.19-4.el7.x86_64Feb 28 10:11:33 Updated: openblas-threads-0.2.19-4.el7.x86_64Feb 28 10:11:34 Updated: openblas-threads64-0.2.19-4.el7.x86_64Feb 28 10:11:35 Updated: openblas-0.2.19-4.el7.x86_64Feb 28 10:11:36 Updated: openblas-openmp64_-0.2.19-4.el7.x86_64Feb 28 10:11:37 Updated: openblas-serial64-0.2.19-4.el7.x86_64Feb 28 10:11:37 Updated: openblas-devel-0.2.19-4.el7.x86_64Feb 28 10:11:43 Updated: libtirpc-0.2.4-0.8.el7.x86_64Feb 28 10:11:44 Updated: 1:nfs-utils-1.3.0-0.33.el7.x86_64Feb 28 10:12:22 Installed: kernel-devel-3.10.0-514.6.2.el7.x86_64Feb 28 10:12:27 Updated: x2goserver-4.0.1.20-1.el7.x86_64Feb 28 10:12:27 Updated: x2goserver-xsession-4.0.1.20-1.el7.x86_64

From dkms status, it seems that ZFS is not installed:

$ sudo dkms statusnvidia, 352.93, 3.10.0-327.10.1.el7.x86_64, x86_64: installednvidia-uvm, 352.93, 3.10.0-327.10.1.el7.x86_64, x86_64: installed (original_module exists)spl, 0.6.5.9: addedzfs, 0.6.5.9: addednvidia-uvm, 352.93, 3.10.0-229.el7.x86_64, x86_64: installed-weak from 3.10.0-327.10.1.el7.x86_64nvidia, 352.93, 3.10.0-327.18.2.el7.x86_64, x86_64: installed-weak from 3.10.0-327.10.1.el7.x86_64nvidia-uvm, 352.93, 3.10.0-327.18.2.el7.x86_64, x86_64: installed-weak from 3.10.0-327.10.1.el7.x86_64nvidia, 352.93, 3.10.0-327.4.4.el7.x86_64, x86_64: installed-weak from 3.10.0-327.10.1.el7.x86_64nvidia-uvm, 352.93, 3.10.0-327.4.4.el7.x86_64, x86_64: installed-weak from 3.10.0-327.10.1.el7.x86_64

and when I try to do dkms install I get an error:

$ sudo dkms install zfs/0.6.5.9 Error! echoYour kernel headers for kernel 3.10.0-327.18.2.el7.x86_64 cannot be found at/lib/modules/3.10.0-327.18.2.el7.x86_64/build or /lib/modules/3.10.0-327.18.2.el7.x86_64/source.

The version of kernel-headers seems to match kernel, but there is no kernel-devel package of the same version in the repository.

$ yum list installed | grep kernelkernel.x86_64                         3.10.0-229.el7                   @anacondakernel.x86_64                         3.10.0-327.4.4.el7               @updates kernel.x86_64                         3.10.0-327.10.1.el7              @updates kernel.x86_64                         3.10.0-327.18.2.el7              @updates kernel-devel.x86_64                   3.10.0-327.28.3.el7              @updates kernel-devel.x86_64                   3.10.0-327.36.1.el7              @updates kernel-devel.x86_64                   3.10.0-327.36.2.el7              @updates kernel-devel.x86_64                   3.10.0-327.36.3.el7              @updates kernel-devel.x86_64                   3.10.0-514.6.2.el7               @updates kernel-headers.x86_64                 3.10.0-327.18.2.el7              @updates kernel-tools.x86_64                   3.10.0-327.18.2.el7              @updates kernel-tools-libs.x86_64              3.10.0-327.18.2.el7              @updates $ sudo yum install "kernel-devel-uname-r == $(uname -r)"[...]No package kernel-devel-uname-r == 3.10.0-327.18.2.el7.x86_64 available.Error: Nothing to do

How should I proceed?

I thought of upgrading the kernel (to release 514.6.2.el7), but I'm adverse to doing this because I'm worried that it might break things. (I inherited this server as a temporary admin and I don't understand everything about how it is configured.)