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we have rhel servers with version 7.2 and kernel versions - 3.10.0-327.el7

since we have network connectivity issues per as described on Red Hat case , we decided to upgrade the kernel from 3.10.0-327.el7 to kernel-3.10.0-1127

but on the next month we also preparing to upgrade the rhel version from 7.2 to 7.6

and rhel 7.6 include the kernel version = 3.10.0-957

so I not sure if we have conflicts here ?

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    I think update from 7.2 to 7.6 will install older kernel, but your custom kernel should still be available via grub menu. You should be able to upgrade kernel in the same way, as you did it before, if the newest kernel gets deleted somehow, but I think it won't, because kernel is always installed and not upgraded as other packages are. I would recommend to test the upgrade procedure on a test machine. It can be a virtual machine.
    – nobody
    Dec 31 '20 at 8:46
  • Depending on exactly how the update from 7.2 to 7.6 is performed, it might not even install the old kernel: if the update is essentially a yum update, it should detect that the current kernel already satisfies the dependencies of the 7.6 patch level, as it's equal or greater than the 7.6 release kernel.
    – telcoM
    Dec 31 '20 at 17:54
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RHEL/Fedora/CentOS allow to coinstall as many Linux kernel versions as you need.

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