安装安装ELRepo
导入公钥：
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
安装ELRepo 8
yum install https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm
启用 ELRepo 源仓库：
yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
安装新内核：
yum --enablerepo=elrepo-kernel install kernel-ml
/etc/sysctl.conf，加入如下代码：
net.core.default_qdisc = fq net.ipv4.tcp_congestion_control = bbr
保存，并执行 sysctl -p 即可。
或者
echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
sysctl -p通过以下三条指令验证是否已经开启成功
sysctl net.ipv4.tcp_available_congestion_control sysctl net.ipv4.tcp_congestion_control lsmod | grep bbr
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