一、centos7升級核心

uname -r 檢視核心版本

升級前

升級後

參考連結： https://www.cnblogs.com/rick-zhang/p/14944510.html

# 啟用 ELRepo 倉庫
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
yum --enablerepo=elrepo-kernel install kernel-ml

vi /etc/default/grub
修改GRUB_DEFAULT=0

# 重新建立核心配置
grub2-mkconfig -o /boot/grub2/grub.cfg

reboot

2、wireguard優化

核心升級後，wireguard無法啟動，報錯資訊如下

# wg-quick up /etc/wireguard/wg0.conf
[#] ip link add wg0 type wireguard
RTNETLINK answers: Operation not supported
Unable to access interface: Protocol not supported
[#] ip link delete dev wg0
Cannot find device "wg0"

參考連結：https://www.wireguard.com/install/　

重新安裝後恢復

yum install yum-utils epel-release
yum-config-manager --setopt=centosplus.includepkgs=kernel-plus --enablerepo=centosplus --save
sed -e 's/^DEFAULTKERNEL=kernel$/DEFAULTKERNEL=kernel-plus/' -i /etc/sysconfig/kernel
yum install kernel-plus wireguard-tools
reboot