Debian/Ubuntu/CentOS手动更换内核并开启BBR拥塞算法
说明
BBR 是 Google 开源的 TCP BBR 拥塞控制算法，用于提升网络连接速度，提升空间巨大，优化效果非常明显； BBR 仅支持4.9以上内核 Ubuntu 18.04 CentOS 8 Debian 9 均为4.9以上内核无需更换内核可以直接开启BBR；
脚本安装
如果不想手动更换可以使用以下一键脚本
BBR 一键脚本：https://sunpma.com/39.html
BBR2 一键脚本：https://sunpma.com/621.html
BBR BBRplus，BBR魔改 一键脚本：https://sunpma.com/37.html
内核版本查询：https://kernel.ubuntu.com/~kernel-ppa/mainline
安装内核
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更新系统软件包到最新版
apt update && apt upgrade -y-
查看系统位数
uname -m或uname -a均可执行后返回 x86_64 那就是64位系统；如果返回 i386或386或i686或686 那就是32位系统;
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下载内核
## 64位系统：## 4.17.0wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17/linux-headers-4.17.0-041700_4.17.0-041700.201806041953_all.debwget https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17/linux-headers-4.17.0-041700-generic_4.17.0-041700.201806041953_amd64.debwget https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17/linux-image-unsigned-4.17.0-041700-generic_4.17.0-041700.201806041953_amd64.debwget https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17/linux-modules-4.17.0-041700-generic_4.17.0-041700.201806041953_amd64.deb## 4.19.0wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19/linux-headers-4.19.0-041900_4.19.0-041900.201810221809_all.debwget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19/linux-headers-4.19.0-041900-generic_4.19.0-041900.201810221809_amd64.debwget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19/linux-image-unsigned-4.19.0-041900-generic_4.19.0-041900.201810221809_amd64.debwget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19/linux-modules-4.19.0-041900-generic_4.19.0-041900.201810221809_amd64.deb## 5.2.4wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.2.4/linux-headers-5.2.4-050204_5.2.4-050204.201907280731_all.debwget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.2.4/linux-headers-5.2.4-050204-generic_5.2.4-050204.201907280731_amd64.debwget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.2.4/linux-image-unsigned-5.2.4-050204-generic_5.2.4-050204.201907280731_amd64.debwget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.2.4/linux-modules-5.2.4-050204-generic_5.2.4-050204.201907280731_amd64.deb## 5.6.0wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.6/linux-headers-5.6.0-050600_5.6.0-050600.202003292333_all.debwget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.6/linux-headers-5.6.0-050600-generic_5.6.0-050600.202003292333_amd64.debwget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.6/linux-image-unsigned-5.6.0-050600-generic_5.6.0-050600.202003292333_amd64.debwget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.6/linux-modules-5.6.0-050600-generic_5.6.0-050600.202003292333_amd64.deb## 32位系统：## 4.19.0wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19/linux-headers-4.19.0-041900_4.19.0-041900.201810221809_all.debwget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19/linux-headers-4.19.0-041900-generic_4.19.0-041900.201810221809_i386.debwget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19/linux-image-4.19.0-041900-generic_4.19.0-041900.201810221809_i386.debwget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19/linux-modules-4.19.0-041900-generic_4.19.0-041900.201810221809_i386.deb-
安装内核
dpkg -i *.deb-
更新grub系统引导文件
update-grub-
重启服务器
reboot-
重启后查看系统内核版本，确认是否安装成功
uname -m或uname -a均可CentOS :
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更换内核
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.orgrpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpmyum --enablerepo=elrepo-kernel install kernel-ml -y-
查看内核是否安装成功
rpm -qa | grep kernel-
更新grub系统引导文件
egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \'grub2-set-default 0 #default 0表示第一个内核设置为默认运行, 选择最新内核就对了
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重启服务器
reboot开启BBR
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删除BBR
为了避免升级内核重复添加BBR开启代码，可以使用以下命令先删除一遍
sed -i '/net\.core\.default_qdisc=fq/d' /etc/sysctl.confsed -i '/net\.ipv4\.tcp_congestion_control=bbr/d' /etc/sysctl.conf-
开启BBR
echo "net.core.default_qdisc=fq" >> /etc/sysctl.confecho "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf-
使其生效
sysctl -p-
查看BBR是否开启成功
执行如下命令，如果返回值中有bbr即说明开启成功
sysctl net.ipv4.tcp_congestion_control执行如下命令，如果返回值中有tcp_bbr模块，即说明开启成功
lsmod | grep bbr