VPS安装开启TCP BBR提速工具

TCP BBR拥塞控制算法(简称BBR)，可以应用到常规的KVM和XEN架构的VPS、服务器中，用来提升服务器下载的速度。因为要涉及到内核的修改，Vultr中文网(http://www.cnvultr.com/)建议我们使用在一些非网站环境中的项目，比如搭建的软件工具据说有可以较大的提高速度。

第一、预先准备工作

1、鉴于内核的修改不确定性，我们需要在非生产环境中安装BBR，如果有其他重要数据的，建议备份。2、如果没有VPS，可以注册账户，参考"Vultr新注册优惠码(http://www.cnvultr.com/15.html)"以及"开通VPS方案(http://www.cnvultr.com/22.html)"。3、操作系统类型：CentOS7 64BIT。

第二、安装BBR之前的速度记录
这里我们先不去安装BBR，用工具测试看看没有安装BBR的Vultr VPS简单的性能。

1、随机节点下载速度

2、视频下载速度

第三、一键安装安装BBR工具方法
这里选择一键安装BBR脚本安装。

[root@linux-node1 ~]# cd /usr/local/src/[root@linux-node1 src]# wget --no-check-certificate https://github.com/teddysun/across/raw/master/bbr.sh[root@linux-node1 src]# chmod +x bbr.sh[root@linux-node1 src]# bash bbr.sh

安装完成后，我们会看到

"Info: The system needs to be restart. Do you want to reboot? [y/n]"，

然后输入y回车，重启服务器。

基本上是可以安装成功的，检查是否成功：

1、uname -r输入命令，查看是否有内核4.9.0内核，有就说明更换内核了。2、sysctl net.ipv4.tcp_available_congestion_control输入命令，然后看是否有返回"net.ipv4.tcp_available_congestion_control = bbr cubic reno"3、lsmod | grep bbr输入命令，是否看到BBR字样

这里我们是安装成功的。

第四、安装BBR之后的速度记录

1、随机节点下载速度

2、视频下载速度

第五、Vultr安装BBR总结
1、在CentOS 7中安装TCP BBR还是比较简单的，一键安装。
2、安装之后，随机下载速度基本没太大的变化；但对于视频速度是有明显的提高。

bbr.sh脚本内容：

#!/bin/bashred='\033[0;31m'green='\033[0;32m'yellow='\033[0;33m'plain='\033[0m'[[ $EUID -ne 0 ]] && echo -e "${red}Error:${plain} This script must be run as root!" && exit 1[[ -d "/proc/vz" ]] && echo -e "${red}Error:${plain} Your VPS is based on OpenVZ, not be supported." && exit 1if [ -f /etc/redhat-release ]; then    release="centos"elif cat /etc/issue | grep -Eqi "debian"; then    release="debian"elif cat /etc/issue | grep -Eqi "ubuntu"; then    release="ubuntu"elif cat /etc/issue | grep -Eqi "centos|red hat|redhat"; then    release="centos"elif cat /proc/version | grep -Eqi "debian"; then    release="debian"elif cat /proc/version | grep -Eqi "ubuntu"; then    release="ubuntu"elif cat /proc/version | grep -Eqi "centos|red hat|redhat"; then    release="centos"figet_latest_version() {    latest_version=$(wget -qO- http://kernel.ubuntu.com/~kernel-ppa/mainline/ | awk -F'\"v' '/v[4-9]./{print $2}' | cut -d/ -f1 | grep -v -  | sort -V | tail -1)    [ -z ${latest_version} ] && return 1    if [[ `getconf WORD_BIT` == "32" && `getconf LONG_BIT` == "64" ]]; then        deb_name=$(wget -qO- http://kernel.ubuntu.com/~kernel-ppa/mainline/v${latest_version}/ | grep "linux-image" | grep "generic" | awk -F'\">' '/amd64.deb/{print $2}' | cut -d'<' -f1 | head -1)        deb_kernel_url="http://kernel.ubuntu.com/~kernel-ppa/mainline/v${latest_version}/${deb_name}"        deb_kernel_name="linux-image-${latest_version}-amd64.deb"    else        deb_name=$(wget -qO- http://kernel.ubuntu.com/~kernel-ppa/mainline/v${latest_version}/ | grep "linux-image" | grep "generic" | awk -F'\">' '/i386.deb/{print $2}' | cut -d'<' -f1 | head -1)        deb_kernel_url="http://kernel.ubuntu.com/~kernel-ppa/mainline/v${latest_version}/${deb_name}"        deb_kernel_name="linux-image-${latest_version}-i386.deb"    fi    [ ! -z ${deb_name} ] && return 0 || return 1}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=1 count=1 2> /dev/null    stty -raw    stty echo    stty $SAVEDSTTY}getversion() {    if [[ -s /etc/redhat-release ]]; then        grep -oE  "[0-9.]+" /etc/redhat-release    else        grep -oE  "[0-9.]+" /etc/issue    fi}centosversion() {    if [ "${release}" == "centos" ]; then        local code=$1        local version="$(getversion)"        local main_ver=${version%%.*}        if [ "$main_ver" == "$code" ]; then            return 0        else            return 1        fi    else        return 1    fi}check_bbr_status() {    local param=$(sysctl net.ipv4.tcp_available_congestion_control | awk '{print $3}')    if uname -r | grep -Eqi "4.10."; then        if [[ "${param}" == "bbr" ]]; then            return 0        else            return 1        fi    else        return 1    fi}install_elrepo() {    if centosversion 5; then        echo -e "${red}Error:${plain} not supported CentOS 5."        exit 1    fi    rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org    if centosversion 6; then        rpm -Uvh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm    elif centosversion 7; then        rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.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 1    fi}install_config() {    if [[ "${release}" == "centos" ]]; then        if centosversion 6; then            if [ ! -f "/boot/grub/grub.conf" ]; then                echo -e "${red}Error:${plain} /boot/grub/grub.conf not found, please check it."                exit 1            fi            sed -i 's/^default=.*/default=0/g' /boot/grub/grub.conf        elif centosversion 7; then            if [ ! -f "/boot/grub2/grub.cfg" ]; then                echo -e "${red}Error:${plain} /boot/grub2/grub.cfg not found, please check it."                exit 1            fi            grub2-set-default 0        fi    elif [[ "${release}" == "debian" || "${release}" == "ubuntu" ]]; then        /usr/sbin/update-grub    fi    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 2>&1}install_bbr() {    check_bbr_status    if [ $? -eq 0 ]; then        echo        echo -e "${green}Info:${plain} TCP BBR has been successfully installed. nothing to do..."        exit    fi    if [[ "${release}" == "centos" ]]; then        install_elrepo        yum --enablerepo=elrepo-kernel -y install kernel-ml kernel-ml-devel        if [ $? -ne 0 ]; then            echo -e "${red}Error:${plain} Install latest kernel failed, please check it."            exit 1        fi    elif [[ "${release}" == "debian" || "${release}" == "ubuntu" ]]; then        [[ ! -e "/usr/bin/wget" ]] && apt-get -y update && apt-get -y install wget        get_latest_version        [ $? -ne 0 ] && echo -e "${red}Error:${plain} Get latest kernel version failed." && exit 1        wget -c -t3 -T60 -O ${deb_kernel_name} ${deb_kernel_url}        if [ $? -ne 0 ]; then            echo -e "${red}Error:${plain} Download ${deb_kernel_name} failed, please check it."            exit 1        fi        dpkg -i ${deb_kernel_name}        rm -fv ${deb_kernel_name}    else        echo -e "${red}Error:${plain} OS is not be supported, please change to CentOS/Debian/Ubuntu and try again."        exit 1    fi    install_config}clearecho "---------- System Information ----------"echo " OS      : $opsy"echo " Arch    : $arch ($lbit Bit)"echo " Kernel  : $kern"echo "----------------------------------------"echo " Auto install latest kernel for TCP BBR"echoecho " URL: https://teddysun.com/489.html"echo "----------------------------------------"echoecho "Press any key to start...or Press Ctrl+C to cancel"char=`get_char`install_bbrechoread -p "Info: The system needs to be restart. Do you want to reboot? [y/n]" is_rebootif [[ ${is_reboot} == "y" || ${is_reboot} == "Y" ]]; then    rebootelse    exitfi