Loading... **CentOS 7安装新内核并启用Google BBR教程** **高性价比和便宜的VPS/云服务器推荐：** [https://blog.zeruns.tech/archives/383.html](https://blog.zeruns.tech/archives/383.html) 视频教程：https://www.bilibili.com/video/BV1fo4y1R7mQ/ ## 安装新内核 先用 **uname -r** 查看一下自己内核的版本，如果内核版本在4.9.0以上，可以直接跳过本步骤，进入启用Google BBR步骤。 **安装ELRepo** ``` rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm yum --enablerepo=elrepo-kernel install kernel-ml -y ``` 查看是否安装成功，运行 **rpm -qa | grep kernel**，如果出现大于4.9.0的内核，就说明安装成功。 ```bash kernel-3.10.0-693.2.2.el7.x86_64 kernel-ml-4.13.11-1.el7.elrepo.x86_64 kernel-headers-3.10.0-693.2.2.el7.x86_64 kernel-tools-libs-3.10.0-693.2.2.el7.x86_64 kernel-tools-3.10.0-693.2.2.el7.x86_64 kernel-3.10.0-514.26.2.el7.x86_64 kernel-3.10.0-514.el7.x86_64 ``` **启用新内核** 运行以下命令： ```bash grep ^menuentry /etc/grub2.cfg | cut -f 2 -d \' ``` 查看输出 ```bash CentOS Linux (4.13.11-1.el7.elrepo.x86_64) 7 (Core) CentOS Linux 7 Rescue dc7e1e78eb3e4511ae247fc8b84d2c16 (3.10.0-693.2.2.el7.x86_64) CentOS Linux (3.10.0-693.2.2.el7.x86_64) 7 (Core) CentOS Linux (3.10.0-514.26.2.el7.x86_64) 7 (Core) CentOS Linux (3.10.0-514.el7.x86_64) 7 (Core) CentOS Linux (0-rescue-96aa007d97204c57aebfaf6879824e56) 7 (Core) ``` 第一行为0行，看看新内核在第几行，本示例为第0行，所以下面这台命令最后一个参数填0。 ```bash grub2-set-default 0 ``` 执行 `shutdown -r now`重启之后，再运行一下 `uname -r`看看新内核是不是已经成功安装并启用。 如果系统为CentOS 6的话，执行以下命令启用新内核： ```bash sed -i 's/^default=.*/default=0/g' /boot/grub/grub.conf ``` ## 启用Google BBR 运行以下命令： ```bash echo 'net.core.default_qdisc=fq' | sudo tee -a /etc/sysctl.conf echo 'net.ipv4.tcp_congestion_control=bbr' | sudo tee -a /etc/sysctl.conf sudo sysctl -p ``` **查看BBR是否成功启用** 输入 ``` sysctl net.ipv4.tcp_available_congestion_control ``` 有类似的输出 ``````````````````````````````````````````````````````````` net.ipv4.tcp_available_congestion_control = bbr cubic reno ``````````````````````````````````````````````````````````` 输入 `````````````````````````````````````````` sysctl -n net.ipv4.tcp_congestion_control `````````````````````````````````````````` 输出 ```` bbr ```` 最后检查内核模块是否已加载，输入 ````````````````` lsmod | grep bbr ````````````````` 有类似的输出 ```````````````` tcp_bbr 16384 0 ```````````````` 如果三个输入和输出测试都通过了，那么BBR就启用成功了。 参考文档 --- 1.[How to Deploy Google BBR on CentOS 7](https://www.vultr.com/docs/how-to-deploy-google-bbr-on-centos-7) 2.[TCP BBR congestion control comes to GCP – your Internet just got faster](https://cloudplatform.googleblog.com/2017/07/TCP-BBR-congestion-control-comes-to-GCP-your-Internet-just-got-faster.html) 3.[Google BBR on Github](https://github.com/google/bbr) ## 推荐文章： **高性价比和便宜的VPS/云服务器推荐：** https://blog.zeruns.tech/archives/383.html **腾讯内部单边拥塞算法BBR-TCPA一键脚本安装及速度测评：** https://blog.zeruns.tech/archives/13.html **搭建内网穿透服务器，带Web面板：** https://blog.zeruns.tech/archives/397.html **怎样搭建个人博客：** https://blog.zeruns.tech/archives/218.html <hr class="content-copyright" style="margin-top:50px" /><blockquote class="content-copyright" style="font-style:normal"><p class="content-copyright">版权属于：<font color="blue">zeruns</font>（除特别注明外）</p><p class="content-copyright">本文链接：<a class="content-copyright" href="https://blog.zeruns.tech/archives/39.html"><font color="blue">https://blog.zeruns.tech/archives/39.html</font></a></p><p class="content-copyright">本站文章采用 <a class="content-copyright" target="_blank" href="https://creativecommons.org/licenses/by-sa/4.0/"><font color="blue">知识共享署名4.0 国际许可协议</font></a> 进行许可，请在转载时注明出处及本声明！</p></blockquote> 最后修改：2021 年 01 月 28 日 11 : 26 PM © 允许规范转载 赞赏 如果您觉得我的文章有帮助，请随意赞赏，赞赏有助于激发博主的热情，感谢！ 赞赏作者 支付宝微信
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