Centos7升级内核开启BBR过程

yum update -y

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

yum -y --enablerepo=elrepo-kernel install kernel-ml-devel kernel-ml

grep menuentry /boot/grub2/grub.cfg
//把最新的那个内核名称复制下来，并设置新内核为第一启动方式（引导）
grub2-set-default 'CentOS Linux (5.7.8-1.el7.elrepo.x86_64) 7 (Core)'

grub2-mkconfig --output /boot/grub2/grub.cfg

uname -a
Linux VM-0-7-centos 5.7.8-1.el7.elrepo.x86_64 #1 SMP Tue Jul 7 18:43:16 EDT 2020 x86_64 x86_64 x86_64 GNU/Linux

echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
//保存并生效
sysctl -p
//检查BBR是否运行
lsmod |grep bbr
tcp_bbr                20480  14