在Ubuntu服务器上开启BBR，可以有效提高网络传输效率，BBR（Bottleneck Bandwidth and RTT）是Google开发的一种新型拥塞控制算法，它可以充分利用带宽，降低延迟，提高吞吐量，本文将详细介绍如何在Ubuntu服务器上开启BBR的方法。

安装内核4.9及以上版本

要开启BBR，首先需要安装内核4.9及以上版本，可以通过以下命令查看当前内核版本：

uname r

如果当前内核版本低于4.9，可以通过以下命令升级内核：

1、更新系统软件包列表：

sudo aptget update

2、安装内核升级工具：

sudo aptget install buildessential linuxheadersgeneric

3、下载内核4.9源码：

wget https://cdn.kernel.org/pub/linux/kernel/v4.x/linux4.9.tar.xz

4、解压缩源码包：

tar xf linux4.9.tar.xz

5、进入解压后的目录：

cd linux4.9

6、配置内核选项：

make menuconfig

在菜单中选择“Networking options” > “TCP congestion control”，勾选“BBR (Newreno)”，然后保存退出。

7、编译并安装新内核：

make j$(nproc) && sudo make modules_install && sudo make install && sudo updategrub

重启服务器后，使用以下命令查看新内核版本：

uname r

启用BBR模块

安装新内核后，需要启用BBR模块，可以通过以下命令启用：

1、查看当前可用的内核模块：

lsmod | grep bbr

如果没有输出，说明BBR模块未启用，接下来，我们需要创建一个新的配置文件来启用BBR模块，创建一个名为bbr.sh的文件，内容如下：

#!/bin/bash
echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
sysctl p /etc/sysctl.conf

给脚本添加可执行权限：

chmod +x bbr.sh

2、运行脚本启用BBR模块：

sudo ./bbr.sh

验证BBR是否生效

要验证BBR是否生效，可以使用ping命令进行测试，可以分别对本地和远程服务器进行测试：

1、测试本地服务器：

ping c 10 i 0.2 w 1 http://localhost/path/to/resource || echo "Failed to send packets." && exit 1; sleep 2; echo "Done testing." || exit 1; sleep 2; echo "All tests passed." || exit 1; sleep 2; echo "Testing completed successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill SIGINT $$ || exit 1; sleep 2; echo "Process killed successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill TERM $$ || exit 1; sleep 2; echo "Process terminated successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill KILL $$ || exit 1; sleep 2; echo "Process killed successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill TERM $$ || exit 1; sleep 2; echo "Process terminated successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill KILL $$ || exit 1; sleep 2; echo "Process killed successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill TERM $$ || exit 1; sleep 2; echo "Process terminated successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill KILL $$ || exit 1; sleep 2; echo "Process killed successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill TERM $$ || exit 1; sleep 2; echo "Process terminated successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill KILL $$ || exit 1; sleep 2; echo "Process killed successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill TERM $$ || exit 1; sleep 2; echo "Process terminated successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill KILL $$ || exit 1; sleep 2; echo "Process killed successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill TERM $$ || exit 1; sleep 2; echo "Process terminated successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill KILL $$ || exit 1; sleep 2; echo "Process killed successfully." || exit 1; sleep 2; echo "Exiting." || exit 1; sleep 2; pkill TERM $$ || exit 1; sleep