目前，当我uname -msr在 CentOS 7 机器上运行时，我得到
Linux 5.15.0 x86_64
但是，我在类似的帖子中读到过这，内核版本应为3.10.xxxx。这一点从维基百科上也能得到证实。
我已经运行yum install kernel-devel并在我的/usr/src/kernels/目录中，我看到
$ ls /usr/src/kernels/
3.10.0-1160.88.1.el7.x86_64 3.10.0-1160.88.1.el7.x86_64.debug 3.10.0-693.el7.x86_64
所以我的问题是为什么 uname -r 显示的内容与 centos 支持的内核版本不同？这里有什么区别呢。
CentOS 版本
$ cat /etc/os-release
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"
编辑
$ rpm -qa | grep kernel
kernel-devel-3.10.0-1160.88.1.el7.x86_64
kernel-ml-6.2.10-1.el7.elrepo.x86_64
kernel-3.10.0-1160.88.1.el7.x86_64
kernel-tools-3.10.0-1160.88.1.el7.x86_64
kernel-debug-devel-3.10.0-1160.88.1.el7.x86_64
kernel-tools-libs-3.10.0-1160.88.1.el7.x86_64
kernel-headers-3.10.0-1160.88.1.el7.x86_64
kernel-3.10.0-693.el7.x86_64
$ yum repolist
Loaded plugins: fastestmirror
Determining fastest mirrors
* base: mirrors.tuna.tsinghua.edu.cn
* centos-sclo-rh: mirrors.tuna.tsinghua.edu.cn
* centos-sclo-sclo: mirrors.tuna.tsinghua.edu.cn
* elrepo: mirrors.tuna.tsinghua.edu.cn
* extras: mirrors.tuna.tsinghua.edu.cn
* updates: mirrors.tuna.tsinghua.edu.cn
repo id repo name status
base/7/x86_64 CentOS-7 - Base 10,072
centos-sclo-rh/x86_64 CentOS-7 - SCLo rh 8,170
centos-sclo-sclo/x86_64 CentOS-7 - SCLo sclo 816
docker-ce-stable/7/x86_64 Docker CE Stable - x86_64 223
elrepo ELRepo.org Community Enterprise Linux Repository - el7 146
extras/7/x86_64 CentOS-7 - Extras 515
updates/7/x86_64 CentOS-7 - Updates
编辑2
$ ls -l /lib/modules /boot
/boot:
total 373616
-rw-r--r--. 1 root root 153619 Mar 7 23:46 config-3.10.0-1160.88.1.el7.x86_64
-rw-r--r--. 1 root root 140894 Aug 23 2017 config-3.10.0-693.el7.x86_64
-rw-r--r--. 1 root root 243280 Apr 5 02:17 config-6.2.10-1.el7.elrepo.x86_64
drwx------. 3 root root 16384 Jan 1 1970 efi
drwxr-xr-x. 2 root root 27 Sep 10 2020 grub
drwx------. 2 root root 21 Apr 10 23:11 grub2
-rw-------. 1 root root 51335016 Sep 10 2020 initramfs-0-rescue-2dce683a368f4627b753b7f4fb98e25b.img
-rw-------. 1 root root 22665935 Apr 10 23:16 initramfs-3.10.0-1160.88.1.el7.x86_64.img
-rw-------. 1 root root 22125539 Apr 10 23:17 initramfs-3.10.0-693.el7.x86_64.img
-rw-------. 1 root root 18774483 Sep 10 2020 initramfs-3.10.0-693.el7.x86_64kdump.img
-rw-------. 1 root root 41979536 Oct 16 2020 initramfs-4.9.0-dockrdma.img
-rw-------. 1 root root 131834625 Mar 27 14:44 initramfs-5.15.0.img
-rw-------. 1 root root 25586671 Apr 11 10:22 initramfs-6.2.10-1.el7.elrepo.x86_64.img
-rw-r--r--. 1 root root 611343 Sep 10 2020 initrd-plymouth.img
-rw-r--r--. 1 root root 320760 Mar 7 23:46 symvers-3.10.0-1160.88.1.el7.x86_64.gz
-rw-r--r--. 1 root root 293027 Aug 23 2017 symvers-3.10.0-693.el7.x86_64.gz
-rw-r--r--. 1 root root 325156 Apr 5 02:19 symvers-6.2.10-1.el7.elrepo.x86_64.gz
lrwxrwxrwx. 1 root root 23 Mar 27 14:42 System.map -> /boot/System.map-5.15.0
-rw-------. 1 root root 3623956 Mar 7 23:46 System.map-3.10.0-1160.88.1.el7.x86_64
-rw-------. 1 root root 3228420 Aug 23 2017 System.map-3.10.0-693.el7.x86_64
-rw-r--r--. 1 root root 3546452 Oct 16 2020 System.map-4.9.0-dockrdma
-rw-r--r--. 1 root root 4773612 Mar 27 14:42 System.map-5.15.0
-rw-------. 1 root root 6451480 Apr 5 02:17 System.map-6.2.10-1.el7.elrepo.x86_64
lrwxrwxrwx. 1 root root 20 Mar 27 14:42 vmlinuz -> /boot/vmlinuz-5.15.0
-rwxr-xr-x. 1 root root 5877760 Sep 10 2020 vmlinuz-0-rescue-2dce683a368f4627b753b7f4fb98e25b
-rwxr-xr-x. 1 root root 7051880 Mar 7 23:46 vmlinuz-3.10.0-1160.88.1.el7.x86_64
-rwxr-xr-x. 1 root root 5877760 Aug 23 2017 vmlinuz-3.10.0-693.el7.x86_64
-rw-r--r--. 1 root root 6261632 Oct 16 2020 vmlinuz-4.9.0-dockrdma
-rw-r--r--. 1 root root 8679392 Mar 27 14:42 vmlinuz-5.15.0
-rwxr-xr-x. 1 root root 10762144 Apr 5 02:17 vmlinuz-6.2.10-1.el7.elrepo.x86_64
/lib/modules:
total 20
drwxr-xr-x. 7 root root 4096 Apr 10 23:16 3.10.0-1160.88.1.el7.x86_64
drwxr-xr-x. 7 root root 4096 Nov 20 2020 3.10.0-693.el7.x86_64
drwxr-xr-x. 3 root root 4096 Oct 16 2020 4.9.0-dockrdma
drwxr-xr-x. 4 root root 4096 Mar 27 14:56 5.15.0
drwxr-xr-x. 7 root root 4096 Apr 11 10:22 6.2.10-1.el7.elrepo.x86_64