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安装BBR

1、安装BBR内核

#CentOS 6系统#导入ELRepo公钥wget https://www.elrepo.org/RPM-GPG-KEY-elrepo.orgrpm --import RPM-GPG-KEY-elrepo.org#安装ELReporpm -Uvh http://www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpm#升级最新内核yum --enablerepo=elrepo-kernel install kernel-ml -y#调整内核启动顺序sed -i '/default=/d' /boot/grub/grub.conf && echo -e "\ndefault=0\c" >> /boot/grub/grub.conf #重启reboot#CentOS 7系统#导入ELRepo公钥wget https://www.elrepo.org/RPM-GPG-KEY-elrepo.orgrpm --import RPM-GPG-KEY-elrepo.org#安装ELReporpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm#升级最新内核yum --enablerepo=elrepo-kernel install kernel-ml -y#调整内核启动顺序grub2-mkconfig -o /boot/grub2/grub.cfg && grub2-set-default 0#重启reboot

2、开启BBR

#查看最新内核，如果大于4.9，则进行下一步uname -r#修改配置cat >>/etc/sysctl.conf << EOFnet.core.default_qdisc=fqnet.ipv4.tcp_congestion_control=bbrEOF#使配置生效sysctl -p#检查生效，输出带有tcp_bbr 20480  0即生效lsmod | grep bbr

安装魔改BBR

由于通过ELRepo安装的最新内核版本太高，不支持魔改BBR，所以上面安装内核的方法不可用，只能手动安装稍低版本的内核。

1、安装新内核

#CentOS 6系统#下载并安装内核wget https://www.moerats.com/usr/down/CentOS_Kernel/kernel-ml-4.12.10-1.el6.elrepo.x86_64.rpm && yum -y install kernel-ml-4.12.10-1.el6.elrepo.x86_64.rpmwget https://www.moerats.com/usr/down/CentOS_Kernel/kernel-ml-devel-4.12.10-1.el6.elrepo.x86_64.rpm && yum -y install kernel-ml-devel-4.12.10-1.el6.elrepo.x86_64.rpmwget https://www.moerats.com/usr/down/CentOS_Kernel/kernel-ml-headers-4.12.10-1.el6.elrepo.x86_64.rpm && yum -y install kernel-ml-headers-4.12.10-1.el6.elrepo.x86_64.rpm#调整内核启动顺序sed -i '/default=/d' /boot/grub/grub.conf && echo -e "\ndefault=0\c" >> /boot/grub/grub.conf#重启reboot#CentOS 7系统#下载并安装内核wget https://www.moerats.com/usr/down/CentOS_Kernel/kernel-ml-4.12.10-1.el7.elrepo.x86_64.rpm && yum -y install kernel-ml-4.12.10-1.el7.elrepo.x86_64.rpmwget https://www.moerats.com/usr/down/CentOS_Kernel/kernel-ml-devel-4.12.10-1.el7.elrepo.x86_64.rpm && yum -y install kernel-ml-devel-4.12.10-1.el7.elrepo.x86_64.rpmwget https://www.moerats.com/usr/down/CentOS_Kernel/kernel-ml-headers-4.12.10-1.el7.elrepo.x86_64.rpm && yum -y install kernel-ml-headers-4.12.10-1.el7.elrepo.x86_64.rpm#调整内核启动顺序grub2-mkconfig -o /boot/grub2/grub.cfg && grub2-set-default 0#重启reboot

检查当前已安装内核，并删除新内核以外的内核

rpm -qa | grep kernelyum remove -y 内核名

3、开启魔改BBR

#安装依赖yum -y install make gccwget -O ./tcp_tsunami.c https://www.moerats.com/usr/down/CentOS_Kernel/tcp_tsunami.c#安装魔改BBRecho "obj-m:=tcp_tsunami.o" > Makefilemake -C /lib/modules/`uname -r`/build M=`pwd` modules CC=/usr/bin/gccchmod +x ./tcp_tsunami.kocp -rf ./tcp_tsunami.ko /lib/modules/`uname -r`/kernel/net/ipv4insmod tcp_tsunami.kodepmod -a#修改配置echo "net.core.default_qdisc=fq" >> /etc/sysctl.confecho "net.ipv4.tcp_congestion_control=tsunami" >> /etc/sysctl.confsysctl -p

检查开启状态

lsmod | grep tsunami

如果返回tcp_tsunami 16384 26类似信息，则开启成功。

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