Detailed steps for linux kernel upgrade

# Install yum source;
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7 .elrepo.noarch.rpm

# Check available kernel versions

yum --disablerepo="*" --enablerepo="elrepo-kernel" list available

 

# To install the latest kernel, you can also specify the kernel version
yum --enablerepo=elrepo-kernel install kernel-ml

yum  install kernel-ml-tools-libs.x86_64

#View the kernel sequence
awk -F\' '$1=="menuentry " {print $2}' /etc/grub2.cfg

# Modify the kernel order;
sed -i 's/saved/0/g' /etc/default/grub

# Generate grub configuration file
grub2-mkconfig -o /boot/grub2/grub.cfg

 

#Restart the host (the running program will also be stopped, please be careful);
reboot

 # Verify whether the upgrade is successful;
uname -r