Linux内核升级

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rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
# RHEL8,CentOS8
yum install -y https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm
# RHEL7,SL7,CentOS7
yum install -y https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
# RHEL6,SL6,CentOS6
yum install -y https://www.elrepo.org/elrepo-release-6.el6.elrepo.noarch.rpm
# 建议先备份 /etc/yum.repos.d/elrepo.repo
cp /etc/yum.repos.d/elrepo.repo /etc/yum.repos.d/elrepo.repo.bak

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sed -i 's#elrepo.org/linux#mirrors.tuna.tsinghua.edu.cn/elrepo#g' /etc/yum.repos.d/elrepo.repo
sed -i 's|^mirrorlist=|#mirrorlist=|g' /etc/yum.repos.d/elrepo.repo

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yum --disablerepo=\* --enablerepo=elrepo-kernel -y install kernel-lt

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yum --disablerepo=\* --enablerepo=elrepo-kernel -y install kernel-ml

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yum -y remove kernel-tools-libs.x86_64 kernel-tools.x86_64
yum -y remove kernel-headers.x86_64

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# 长期支持内核
yum --disablerepo=\* --enablerepo=elrepo-kernel -y install kernel-lt-tools kernel-lt-devel kernel-lt-headers -y
# 稳定主线内核
yum --disablerepo=\* --enablerepo=elrepo-kernel -y install kernel-ml-tools kernel-ml-devel kernel-ml-headers -y

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grep "^menuentry" /boot/grub2/grub.cfg | cut -d "'" -f2

CentOS Linux (5.13.0-1.el7.elrepo.x86_64) 7 (Core)
CentOS Linux (3.10.0-957.el7.x86_64) 7 (Core)
CentOS Linux (0-rescue-2b92643a629144ceadb7403c0d9f3683) 7 (Core)

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grub2-editenv list

saved_entry=CentOS Linux (3.10.0-957.el7.x86_64) 7 (Core)

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grub2-set-default 'CentOS Linux (5.13.0-1.el7.elrepo.x86_64) 7 (Core)'

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reboot
uname -r