1. 安裝ELRepo
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
# install ELRepo for RHEL-8 or CentOS-8
# rpm -Uvh https://www.elrepo.org/elrepo-release-8.0-2.el8.elrepo.noarch.rpm
# install ELRepo for RHEL-7 or CentOS-7
rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm
# install ELRepo for RHEL-6, SL-6 or CentOS-6
rpm -Uvh https://www.elrepo.org/elrepo-release-6-9.el6.elrepo.noarch.rpm
2. 升級 CentOS 7 內核
yum --enablerepo=elrepo-kernel -y install kernel-ml kernel-ml-devel
3. 更新grub引導
# 查詢當前內核版本
uname -r
> 3.10.0-957.27.2.el7.x86_64
# 查詢可用內核版本
egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \'
> CentOS Linux (5.2.14-1.el7.elrepo.x86_64) 7 (Core)
> CentOS Linux (3.10.0-957.27.2.el7.x86_64) 7 (Core)
> CentOS Linux (3.10.0-514.26.2.el7.x86_64) 7 (Core)
> CentOS Linux (3.10.0-514.el7.x86_64) 7 (Core)
> CentOS Linux (0-rescue-963c2c41b08343f7b063dddac6b2e486) 7 (Core)
# 更換默認啟動內核
grub2-set-default 0
# 重啟
reboot
4. 寫入BBR配置文件
echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
# 保存配置文件
sysctl -p
5. 檢查BBR是否啟用成功
# 當返回結果包含bbr，則啟用成功
sysctl net.ipv4.tcp_available_congestion_control
> net.ipv4.tcp_available_congestion_control = reno cubic bbr
# 當能查詢到bbr，則啟用成功
lsmod | grep bbr
> tcp_bbr 20480 6
End
至此已成功啟用CentOS 7上的Google BBR加速