How to check linux kernel before reboot
#check cat /var/log/dmesg.old
cat /var/log/dmesg.old | grep Linux | grep version
[ 0.000000] Linux version 3.10.0-1062.12.1.el7.x86_64 (mockbuild@x86-034.build.eng.bos.redhat.com) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC) ) #1 SMP Thu Dec 12 06:44:49 EST 2019
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