为什么想到这个呢,算法什么的又不太懂,这是 因为搭建VPN + BBR 与之简直绝配

有的人搭建SSR ,配一个什么锐速,还需要降内核版本, 而且还容易出错,降了之后更加容易出现兼容性问题,所以偶尔看到了google的BBR 拥塞阻塞算法

算法原理不知道,也不想去深究 。 原理 这篇博客 讲得还是很清楚的 ,可以一探

Google 开源了其 TCP BBR 拥塞控制算法,并提交到了 Linux 内核,从 4.9 开始,Linux 内核已经用上了该算法。根据谷歌的风格,Google 总是先在自家的生产环境上线运用后,才会将代码开源,此次也不例外。
根据大佬的实地测试,在部署了最新版内核并开启了 TCP BBR 的机器上,网速甚至可以提升好几个数量级。

根据某个大佬开发的一键安装的脚本,可以实现最新内核的安装和 TCP BBR 脚本
脚本如下:

 #!/usr/bin/env bash
#
# Auto install latest kernel for TCP BBR
#
# System Required: CentOS +, Debian7+, Ubuntu12+
#
# Copyright (C) - Teddysun <i@teddysun.com>
#
# URL: https://teddysun.com/489.html
# red='\033[0;31m'
green='\033[0;32m'
yellow='\033[0;33m'
plain='\033[0m' cur_dir=$(pwd) [[ $EUID -ne ]] && echo -e "${red}Error:${plain} This script must be run as root!" && exit [[ -d "/proc/vz" ]] && echo -e "${red}Error:${plain} Your VPS is based on OpenVZ, which is not supported." && exit if [ -f /etc/redhat-release ]; then
release="centos"
elif cat /etc/issue | grep -Eqi "debian"; then
release="debian"
elif cat /etc/issue | grep -Eqi "ubuntu"; then
release="ubuntu"
elif cat /etc/issue | grep -Eqi "centos|red hat|redhat"; then
release="centos"
elif cat /proc/version | grep -Eqi "debian"; then
release="debian"
elif cat /proc/version | grep -Eqi "ubuntu"; then
release="ubuntu"
elif cat /proc/version | grep -Eqi "centos|red hat|redhat"; then
release="centos"
else
release=""
fi is_digit(){
local input=${}
if [[ "$input" =~ ^[-]+$ ]]; then
return
else
return
fi
} is_64bit(){
if [ $(getconf WORD_BIT) = '' ] && [ $(getconf LONG_BIT) = '' ]; then
return
else
return
fi
} get_valid_valname(){
local val=${}
local new_val=$(eval echo $val | sed 's/[-.]/_/g')
echo ${new_val}
} get_hint(){
local val=${}
local new_val=$(get_valid_valname $val)
eval echo "\$hint_${new_val}"
} #Display Memu
display_menu(){
local soft=${}
local default=${}
eval local arr=(\${${soft}_arr[@]})
local default_prompt
if [[ "$default" != "" ]]; then
if [[ "$default" == "last" ]]; then
default=${#arr[@]}
fi
default_prompt="(default ${arr[$default-1]})"
fi
local pick
local hint
local vname
local prompt="which ${soft} you'd select ${default_prompt}: " while :
do
echo -e "\n------------ ${soft} setting ------------\n"
for ((i=;i<=${#arr[@]};i++ )); do
vname="$(get_valid_valname ${arr[$i-1]})"
hint="$(get_hint $vname)"
[[ "$hint" == "" ]] && hint="${arr[$i-1]}"
echo -e "${green}${i}${plain}) $hint"
done
echo
read -p "${prompt}" pick
if [[ "$pick" == "" && "$default" != "" ]]; then
pick=${default}
break
fi if ! is_digit "$pick"; then
prompt="Input error, please input a number"
continue
fi if [[ "$pick" -lt || "$pick" -gt ${#arr[@]} ]]; then
prompt="Input error, please input a number between 1 and ${#arr[@]}: "
continue
fi break
done eval ${soft}=${arr[$pick-]}
vname="$(get_valid_valname ${arr[$pick-1]})"
hint="$(get_hint $vname)"
[[ "$hint" == "" ]] && hint="${arr[$pick-1]}"
echo -e "\nyour selection: $hint\n"
} version_ge(){
test "$(echo "$@" | tr " " "\n" | sort -rV | head -n 1)" == "$1"
} get_latest_version() {
latest_version=($(wget -qO- https://kernel.ubuntu.com/~kernel-ppa/mainline/ | awk -F'\"v' '/v[4-9]./{print $2}' | cut -d/ -f1 | grep -v - | sort -V)) [ ${#latest_version[@]} -eq ] && echo -e "${red}Error:${plain} Get latest kernel version failed." && exit kernel_arr=()
for i in ${latest_version[@]}; do
if version_ge $i 4.14; then
kernel_arr+=($i);
fi
done display_menu kernel last if [[ `getconf WORD_BIT` == "" && `getconf LONG_BIT` == "" ]]; then
deb_name=$(wget -qO- https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-image" | grep "generic" | awk -F'\">' '/amd64.deb/{print $2}' | cut -d'<' -f1 | head -1)
deb_kernel_url="https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${deb_name}"
deb_kernel_name="linux-image-${kernel}-amd64.deb"
modules_deb_name=$(wget -qO- https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-modules" | grep "generic" | awk -F'\">' '/amd64.deb/{print $2}' | cut -d'<' -f1 | head -1)
deb_kernel_modules_url="https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${modules_deb_name}"
deb_kernel_modules_name="linux-modules-${kernel}-amd64.deb"
else
deb_name=$(wget -qO- https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-image" | grep "generic" | awk -F'\">' '/i386.deb/{print $2}' | cut -d'<' -f1 | head -1)
deb_kernel_url="https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${deb_name}"
deb_kernel_name="linux-image-${kernel}-i386.deb"
modules_deb_name=$(wget -qO- https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-modules" | grep "generic" | awk -F'\">' '/i386.deb/{print $2}' | cut -d'<' -f1 | head -1)
deb_kernel_modules_url="https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${modules_deb_name}"
deb_kernel_modules_name="linux-modules-${kernel}-i386.deb"
fi [ -z ${deb_name} ] && echo -e "${red}Error:${plain} Getting Linux kernel binary package name failed, maybe kernel build failed. Please choose other one and try again." && exit
} get_opsy() {
[ -f /etc/redhat-release ] && awk '{print ($1,$3~/^[0-9]/?$3:$4)}' /etc/redhat-release && return
[ -f /etc/os-release ] && awk -F'[= "]' '/PRETTY_NAME/{print $3,$4,$5}' /etc/os-release && return
[ -f /etc/lsb-release ] && awk -F'[="]+' '/DESCRIPTION/{print $2}' /etc/lsb-release && return
} opsy=$( get_opsy )
arch=$( uname -m )
lbit=$( getconf LONG_BIT )
kern=$( uname -r ) get_char() {
SAVEDSTTY=`stty -g`
stty -echo
stty cbreak
dd if=/dev/tty bs= count= > /dev/null
stty -raw
stty echo
stty $SAVEDSTTY
} getversion() {
if [[ -s /etc/redhat-release ]]; then
grep -oE "[0-9.]+" /etc/redhat-release
else
grep -oE "[0-9.]+" /etc/issue
fi
} centosversion() {
if [ x"${release}" == x"centos" ]; then
local code=$
local version="$(getversion)"
local main_ver=${version%%.*}
if [ "$main_ver" == "$code" ]; then
return
else
return
fi
else
return
fi
} check_bbr_status() {
local param=$(sysctl net.ipv4.tcp_congestion_control | awk '{print $3}')
if [[ x"${param}" == x"bbr" ]]; then
return
else
return
fi
} check_kernel_version() {
local kernel_version=$(uname -r | cut -d- -f1)
if version_ge ${kernel_version} 4.9; then
return
else
return
fi
} install_elrepo() { if centosversion ; then
echo -e "${red}Error:${plain} not supported CentOS 5."
exit
fi rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org if centosversion ; then
rpm -Uvh https://www.elrepo.org/elrepo-release-6-9.el6.elrepo.noarch.rpm
elif centosversion ; then
rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm
fi if [ ! -f /etc/yum.repos.d/elrepo.repo ]; then
echo -e "${red}Error:${plain} Install elrepo failed, please check it."
exit
fi
} sysctl_config() {
sed -i '/net.core.default_qdisc/d' /etc/sysctl.conf
sed -i '/net.ipv4.tcp_congestion_control/d' /etc/sysctl.conf
echo "net.core.default_qdisc = fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control = bbr" >> /etc/sysctl.conf
sysctl -p >/dev/null >&
} install_config() {
if [[ x"${release}" == x"centos" ]]; then
if centosversion ; then
if [ ! -f "/boot/grub/grub.conf" ]; then
echo -e "${red}Error:${plain} /boot/grub/grub.conf not found, please check it."
exit
fi
sed -i 's/^default=.*/default=0/g' /boot/grub/grub.conf
elif centosversion ; then
if [ ! -f "/boot/grub2/grub.cfg" ]; then
echo -e "${red}Error:${plain} /boot/grub2/grub.cfg not found, please check it."
exit
fi
grub2-set-default
fi
elif [[ x"${release}" == x"debian" || x"${release}" == x"ubuntu" ]]; then
/usr/sbin/update-grub
fi
} reboot_os() {
echo
echo -e "${green}Info:${plain} The system needs to reboot."
read -p "Do you want to restart system? [y/n]" is_reboot
if [[ ${is_reboot} == "y" || ${is_reboot} == "Y" ]]; then
reboot
else
echo -e "${green}Info:${plain} Reboot has been canceled..."
exit
fi
} install_bbr() {
check_bbr_status
if [ $? -eq ]; then
echo
echo -e "${green}Info:${plain} TCP BBR has already been installed. nothing to do..."
exit
fi
check_kernel_version
if [ $? -eq ]; then
echo
echo -e "${green}Info:${plain} Your kernel version is greater than 4.9, directly setting TCP BBR..."
sysctl_config
echo -e "${green}Info:${plain} Setting TCP BBR completed..."
exit
fi if [[ x"${release}" == x"centos" ]]; then
install_elrepo
[ ! "$(command -v yum-config-manager)" ] && yum install -y yum-utils > /dev/null >&
[ x"$(yum-config-manager elrepo-kernel | grep -w enabled | awk '{print $3}')" != x"True" ] && yum-config-manager --enable elrepo-kernel > /dev/null >&
if centosversion ; then
if is_64bit; then
rpm_kernel_name="kernel-ml-4.18.20-1.el6.elrepo.x86_64.rpm"
rpm_kernel_devel_name="kernel-ml-devel-4.18.20-1.el6.elrepo.x86_64.rpm"
rpm_kernel_url_1="http://repos.lax.quadranet.com/elrepo/archive/kernel/el6/x86_64/RPMS/"
else
rpm_kernel_name="kernel-ml-4.18.20-1.el6.elrepo.i686.rpm"
rpm_kernel_devel_name="kernel-ml-devel-4.18.20-1.el6.elrepo.i686.rpm"
rpm_kernel_url_1="http://repos.lax.quadranet.com/elrepo/archive/kernel/el6/i386/RPMS/"
fi
rpm_kernel_url_2="https://dl.lamp.sh/files/"
wget -c -t3 -T60 -O ${rpm_kernel_name} ${rpm_kernel_url_1}${rpm_kernel_name}
if [ $? -ne ]; then
rm -rf ${rpm_kernel_name}
wget -c -t3 -T60 -O ${rpm_kernel_name} ${rpm_kernel_url_2}${rpm_kernel_name}
fi
wget -c -t3 -T60 -O ${rpm_kernel_devel_name} ${rpm_kernel_url_1}${rpm_kernel_devel_name}
if [ $? -ne ]; then
rm -rf ${rpm_kernel_devel_name}
wget -c -t3 -T60 -O ${rpm_kernel_devel_name} ${rpm_kernel_url_2}${rpm_kernel_devel_name}
fi
if [ -f "${rpm_kernel_name}" ]; then
rpm -ivh ${rpm_kernel_name}
else
echo -e "${red}Error:${plain} Download ${rpm_kernel_name} failed, please check it."
exit
fi
if [ -f "${rpm_kernel_devel_name}" ]; then
rpm -ivh ${rpm_kernel_devel_name}
else
echo -e "${red}Error:${plain} Download ${rpm_kernel_devel_name} failed, please check it."
exit
fi
rm -f ${rpm_kernel_name} ${rpm_kernel_devel_name}
elif centosversion ; then
yum -y install kernel-ml kernel-ml-devel
if [ $? -ne ]; then
echo -e "${red}Error:${plain} Install latest kernel failed, please check it."
exit
fi
fi
elif [[ x"${release}" == x"debian" || x"${release}" == x"ubuntu" ]]; then
[[ ! -e "/usr/bin/wget" ]] && apt-get -y update && apt-get -y install wget
echo -e "${green}Info:${plain} Getting latest kernel version..."
get_latest_version
if [ -n ${modules_deb_name} ]; then
wget -c -t3 -T60 -O ${deb_kernel_modules_name} ${deb_kernel_modules_url}
if [ $? -ne ]; then
echo -e "${red}Error:${plain} Download ${deb_kernel_modules_name} failed, please check it."
exit
fi
fi
wget -c -t3 -T60 -O ${deb_kernel_name} ${deb_kernel_url}
if [ $? -ne ]; then
echo -e "${red}Error:${plain} Download ${deb_kernel_name} failed, please check it."
exit
fi
[ -f ${deb_kernel_modules_name} ] && dpkg -i ${deb_kernel_modules_name}
dpkg -i ${deb_kernel_name}
rm -f ${deb_kernel_name} ${deb_kernel_modules_name}
else
echo -e "${red}Error:${plain} OS is not be supported, please change to CentOS/Debian/Ubuntu and try again."
exit
fi install_config
sysctl_config
reboot_os
} clear
echo "---------- System Information ----------"
echo " OS : $opsy"
echo " Arch : $arch ($lbit Bit)"
echo " Kernel : $kern"
echo "----------------------------------------"
echo " Auto install latest kernel for TCP BBR"
echo
echo " URL: https://teddysun.com/489.html"
echo "----------------------------------------"
echo
echo "Press any key to start...or Press Ctrl+C to cancel"
char=`get_char` install_bbr >& | tee ${cur_dir}/install_bbr.log

也可以采用在线安装的方式:

wget --no-check-certificate https://github.com/teddysun/across/raw/master/bbr.sh && chmod +x bbr.sh && ./bbr.sh

安装完成后,脚本会提示需要重启 VPS,输入 y 并回车后重启。
重启完成后,进入 VPS,验证一下是否成功安装最新内核并开启 TCP BBR,输入命令:

uname -r

查看内核版本,显示为最新版就表示 OK了

sysctl net.ipv4.tcp_available_congestion_control
返回值一般为:
net.ipv4.tcp_available_congestion_control = bbr cubic reno
或者为:
net.ipv4.tcp_available_congestion_control = reno cubic bbr
=================================================================================
sysctl net.ipv4.tcp_congestion_control
返回值一般为:
net.ipv4.tcp_congestion_control = bbr
=================================================================================
sysctl net.core.default_qdisc
返回值一般为:
net.core.default_qdisc = fq
==================================================================================
lsmod | grep bbr
返回值有 tcp_bbr 模块即说明 bbr 已启动。注意:并不是所有的 VPS 都会有此返回值,若没有也属正常。

另外:

附上大佬的CentOS 下最新版内核 headers 安装方法

本来打算在脚本里直接安装 kernel-ml-headers,但会出现和原版内核 headers 冲突的问题。因此在这里添加一个脚本执行完后,手动安装最新版内核 headers 之教程。
执行以下命令 yum --enablerepo=elrepo-kernel -y install kernel-ml-headers
根据 CentOS 版本的不同,此时一般会出现类似于以下的错误提示: Error: kernel-ml-headers conflicts with kernel-headers-2.6.32-696.20.1.el6.x86_64
Error: kernel-ml-headers conflicts with kernel-headers-3.10.0-693.17.1.el7.x86_64
因此需要先卸载原版内核 headers ,然后再安装最新版内核 headers。执行命令: yum remove kernel-headers
确认无误后,输入 y,回车开始卸载。注意,有时候这么操作还会卸载一些对内核 headers 依赖的安装包,比如 gcc、gcc-c++ 之类的。不过不要紧,我们可以在安装完最新版内核 headers 后再重新安装回来即可。
卸载完成后,再次执行上面给出的安装命令。 yum --enablerepo=elrepo-kernel -y install kernel-ml-headers
成功安装后,再把那些之前对内核 headers 依赖的安装包,比如 gcc、gcc-c++ 之类的再安装一次即可。 为什么要安装最新版内核 headers 呢?
这是因为 ss-libev 版有个 tcp fast open 功能,如果不安装的话,这个功能是无法开启的。 内核升级方法
如果是 CentOS 系统,执行如下命令即可升级内核: yum -y install kernel-ml kernel-ml-devel
如果你还手动安装了新版内核 headers ,那么还需要以下命令来升级 headers : yum -y install kernel-ml-headers
CentOS 6 的话,执行命令: sed -i 's/^default=.*/default=0/g' /boot/grub/grub.conf
CentOS 7 的话,执行命令: grub2-set-default 0
如果是 Debian/Ubuntu 系统,则需要手动下载最新版内核来安装升级。
去这里下载最新版的内核 deb 安装包。
如果系统是 64 位,则下载 amd64 的 linux-image 中含有 generic 这个 deb 包;
如果系统是 32 位,则下载 i386 的 linux-image 中含有 generic 这个 deb 包;
安装的命令如下(以最新版的 64 位 4.12.4 举例而已,请替换为下载好的 deb 包): dpkg -i linux-image-4.12.4-041204-generic_4.12.4-041204.201707271932_amd64.deb
安装完成后,再执行命令: /usr/sbin/update-grub
最后,重启 VPS 即可。 特别说明
如果你使用的是 Google Cloud Platform (GCP)更换内核,有时会遇到重启后,整个磁盘变为只读的情况。只需执行以下命令即可恢复: mount -o remount rw /

参考链接:

https://github.com/google/bbr/blob/master/Documentation/bbr-quick-start.md
http://elrepo.org/tiki/tiki-index.php
http://kernel.ubuntu.com/~kernel-ppa/mainline/

https://teddysun.com/489.html

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