CentOS 启用BBR

CentOS 开启 BBR 加速

一. 升级CentOS 内核

1.1 导入公钥

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

1.2 安装elrepo源

1.2.1 RHEL-7

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm

1.2.2 RHEL-8

yum install https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm

1.2.3 RHEL-9

yum install https://www.elrepo.org/elrepo-release-9.el9.elrepo.noarch.rpm

1.3 安装内核 5.10以上

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

1.4 确认是否安装成功

rpm -qa | grep kernel

• 输出：

  kernel-3.10.0-1160.71.1.el7.x86_64
  kernel-tools-3.10.0-1160.71.1.el7.x86_64
  kernel-ml-5.18.12-1.el7.elrepo.x86_64
  kernel-headers-3.10.0-1160.71.1.el7.x86_64
  kernel-3.10.0-1062.el7.x86_64
  kernel-devel-3.10.0-1062.el7.x86_64
  kernel-tools-libs-3.10.0-1160.71.1.el7.x86_64
  kernel-devel-3.10.0-1160.71.1.el7.x86_64

1.5 查看可用启动项

egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \'

[root@ ~]# egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \'
CentOS Linux (5.18.12-1.el7.elrepo.x86_64) 7 (Core)
CentOS Linux (3.10.0-1160.71.1.el7.x86_64) 7 (Core)
CentOS Linux (3.10.0-1062.el7.x86_64) 7 (Core)
CentOS Linux (0-rescue-d93e9d7030a14fe786947b2903d7a446) 7 (Core)

1.5.1 设置引导项顺序，使用新安装内核来引导启动:

• 顺序从0开始

grub2-set-default 0

1.5.2 重启系统

reboot

二. 配置BBR

2.1 修改sysctl 启用 BBR

echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf

echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf

2.2 执行

sysctl -p

• 输出

  [root@ ~]# sysctl -p
  net.core.rmem_default = 33554432
  net.core.rmem_max = 33554432
  net.ipv4.ip_forward = 1
  net.core.default_qdisc = fq
  net.ipv4.tcp_congestion_control = bbr

lsmod |grep bbr

• 输出

  [root@ ~]# lsmod |grep bbr
  tcp_bbr 20480 9