一、centos7升级内核
uname -r 查看内核版本
升级前
升级后
参考链接： https://www.cnblogs.com/rick-zhang/p/14944510.html
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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
grub2-mkconfig -o /boot/grub2/grub.cfg
reboot
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2、wireguard优化
内核升级后，wireguard无法启动，报错信息如下
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[
RTNETLINK answers: Operation not supported
Unable to access interface: Protocol not supported
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Cannot find device "wg0"
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参考链接：https://www.wireguard.com/install/
重新安装后恢复
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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
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重新添加ip转发
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vi /etc/sysctl.conf
net.ipv4.ip_forward=1
sysctl -p
echo 1 > /proc/sys/net/ipv4/ip_forward
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