kimsufi下centos7更换内核安装BBR操作记录

买了个二手kimsufi的ks7发现速度不理想,想着使用BBR来加速一下.翻了好多百度记录,只有这个成功.当然也有朋友喜欢使用一键包.

1、yum系统更新

yum -y update

2、查看系统版本

cat /etc/redhat-release

输出如下则表示已升级到7.7

CentOS Linux release 7.7.1908 (Core)

3、安装elrepo并升级内核(命令是一条一条输入的)

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

正常情况下将输出如下信息：

[root@ns3026884 ~]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org [root@ns3026884 ~]# rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm Retrieving http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm Retrieving http://elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm Preparing... ################################# [100%] Updating / installing... 1:elrepo-release-7.0-4.el7.elrepo ################################# [100%] [root@ns3026884 ~]# yum --enablerepo=elrepo-kernel install kernel-ml -y Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * elrepo: mirrors.coreix.net * elrepo-kernel: mirrors.coreix.net elrepo | 2.9 kB 00:00:00 elrepo-kernel | 2.9 kB 00:00:00 (1/2): elrepo/primary_db | 467 kB 00:00:00 (2/2): elrepo-kernel/primary_db | 1.9 MB 00:00:00 Resolving Dependencies --> Running transaction check ---> Package kernel-ml.x86_64 0:5.6.7-1.el7.elrepo will be installed --> Processing Dependency: grubby >= 8.28-2 for package: kernel-ml-5.6.7-1.el7.elrepo.x86_64 --> Processing Dependency: /usr/sbin/new-kernel-pkg for package: kernel-ml-5.6.7-1.el7.elrepo.x86_64 --> Processing Dependency: /usr/sbin/new-kernel-pkg for package: kernel-ml-5.6.7-1.el7.elrepo.x86_64 --> Running transaction check ---> Package grubby.x86_64 0:8.28-26.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================================================================= Package Arch Version Repository Size ================================================================================================================================= Installing: kernel-ml x86_64 5.6.7-1.el7.elrepo elrepo-kernel 49 M Installing for dependencies: grubby x86_64 8.28-26.el7 base 71 k Transaction Summary ================================================================================================================================= Install 1 Package (+1 Dependent package) Total download size: 49 M Installed size: 222 M Downloading packages: (1/2): grubby-8.28-26.el7.x86_64.rpm | 71 kB 00:00:00 (2/2): kernel-ml-5.6.7-1.el7.elrepo.x86_64.rpm | 49 MB 00:00:04 --------------------------------------------------------------------------------------------------------------------------------- Total 10 MB/s | 49 MB 00:00:04 Running transaction check Running transaction test Transaction test succeeded Running transaction Warning: RPMDB altered outside of yum. Installing : grubby-8.28-26.el7.x86_64 1/2 Installing : kernel-ml-5.6.7-1.el7.elrepo.x86_64 2/2 Verifying : kernel-ml-5.6.7-1.el7.elrepo.x86_64 1/2 Verifying : grubby-8.28-26.el7.x86_64 2/2 Installed: kernel-ml.x86_64 0:5.6.7-1.el7.elrepo Dependency Installed: grubby.x86_64 0:8.28-26.el7 Complete!

安装完成后使用下面命令查看当前已安装的内核:

awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg

返回:

[root@ns3026884 ~]# awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg 0 : CentOS Linux (5.6.7-1.el7.elrepo.x86_64) 7 (Core) 1 : CentOS Linux (4.19-ovh-xxxx-std-ipv6-64) 7 (Core)

把CentOS Linux (4.19.0-1.el7.elrepo.x86_64) 7 (Core)内核设置为默认:

[root@ns3026884 ~]# grub2-set-default 0

重启:

reboot

4、设置BBR

• 编辑(vi教程:https://www.runoob.com/linux/linux-vim.html)

vi /etc/sysctl.conf

• 添加如下内容

net.core.default_qdisc = fq net.ipv4.tcp_congestion_control = bbr

• 退出vi,执行一下命令,加载系统参数（正常情况下会输出我们之前加入的内容）

sysctl -p

可以看到:

[root@ns3026884 ~]# sysctl -p net.core.default_qdisc = fq net.ipv4.tcp_congestion_control = bbr

5、验证bbr是否已经开启

a. 如果

sysctl net.ipv4.tcp_available_congestion_control

返回

net.ipv4.tcp_available_congestion_control = reno cubic bbr

则成功!

b.如果

lsmod | grep bbr

返回形如如下形式的信息即成功

tcp_bbr 20480 2

附言:为了测试 BBR 的网络性能增强, 您可以在 Web 主机目录中创建一个文件以供下载, 然后, 从台式计算机上的 Web 浏览器测试下载速度。

sudo dd if=/dev/zero of=500mb.zip bs=1024k count=500

最后, 从桌面计算机上的 Web 浏览器访问http://ip/500mb.zip , 然后评估执行下载速度。

 

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